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From a.@apache.org
Subject [2/2] hadoop git commit: HADOOP-8989. hadoop fs -find feature (Jonathan Allen via aw) (missed some files)
Date Thu, 15 Jan 2015 19:58:02 GMT
HADOOP-8989. hadoop fs -find feature (Jonathan Allen via aw) (missed some files)


Project: http://git-wip-us.apache.org/repos/asf/hadoop/repo
Commit: http://git-wip-us.apache.org/repos/asf/hadoop/commit/450561a9
Tree: http://git-wip-us.apache.org/repos/asf/hadoop/tree/450561a9
Diff: http://git-wip-us.apache.org/repos/asf/hadoop/diff/450561a9

Branch: refs/heads/branch-2
Commit: 450561a93469ab7cd0f13fee8b9c3580cb8885a4
Parents: c060d60
Author: Allen Wittenauer <aw@apache.org>
Authored: Thu Jan 15 11:57:48 2015 -0800
Committer: Allen Wittenauer <aw@apache.org>
Committed: Thu Jan 15 11:57:48 2015 -0800

----------------------------------------------------------------------
 .../org/apache/hadoop/fs/shell/find/And.java    |  84 ++
 .../hadoop/fs/shell/find/BaseExpression.java    | 302 +++++++
 .../apache/hadoop/fs/shell/find/Expression.java | 107 +++
 .../hadoop/fs/shell/find/ExpressionFactory.java | 156 ++++
 .../hadoop/fs/shell/find/FilterExpression.java  | 144 +++
 .../org/apache/hadoop/fs/shell/find/Find.java   | 444 +++++++++
 .../hadoop/fs/shell/find/FindOptions.java       | 271 ++++++
 .../org/apache/hadoop/fs/shell/find/Name.java   | 100 +++
 .../org/apache/hadoop/fs/shell/find/Print.java  |  76 ++
 .../org/apache/hadoop/fs/shell/find/Result.java |  88 ++
 .../hadoop/fs/shell/find/MockFileSystem.java    |  86 ++
 .../apache/hadoop/fs/shell/find/TestAnd.java    | 263 ++++++
 .../fs/shell/find/TestFilterExpression.java     | 145 +++
 .../apache/hadoop/fs/shell/find/TestFind.java   | 900 +++++++++++++++++++
 .../apache/hadoop/fs/shell/find/TestHelper.java |  35 +
 .../apache/hadoop/fs/shell/find/TestIname.java  |  93 ++
 .../apache/hadoop/fs/shell/find/TestName.java   |  93 ++
 .../apache/hadoop/fs/shell/find/TestPrint.java  |  56 ++
 .../apache/hadoop/fs/shell/find/TestPrint0.java |  56 ++
 .../apache/hadoop/fs/shell/find/TestResult.java | 172 ++++
 20 files changed, 3671 insertions(+)
----------------------------------------------------------------------


http://git-wip-us.apache.org/repos/asf/hadoop/blob/450561a9/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/shell/find/And.java
----------------------------------------------------------------------
diff --git a/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/shell/find/And.java b/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/shell/find/And.java
new file mode 100644
index 0000000..ced489c
--- /dev/null
+++ b/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/shell/find/And.java
@@ -0,0 +1,84 @@
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.hadoop.fs.shell.find;
+
+import java.io.IOException;
+import java.util.Deque;
+
+import org.apache.hadoop.fs.shell.PathData;
+
+/**
+ * Implements the -a (and) operator for the
+ * {@link org.apache.hadoop.fs.shell.find.Find} command.
+ */
+final class And extends BaseExpression {
+  /** Registers this expression with the specified factory. */
+  public static void registerExpression(ExpressionFactory factory)
+      throws IOException {
+    factory.addClass(And.class, "-a");
+    factory.addClass(And.class, "-and");
+  }
+
+  private static final String[] USAGE = { "expression -a expression",
+      "expression -and expression", "expression expression" };
+  private static final String[] HELP = {
+      "Logical AND operator for joining two expressions. Returns",
+      "true if both child expressions return true. Implied by the",
+      "juxtaposition of two expressions and so does not need to be",
+      "explicitly specified. The second expression will not be",
+      "applied if the first fails." };
+
+  public And() {
+    super();
+    setUsage(USAGE);
+    setHelp(HELP);
+  }
+
+  /**
+   * Applies child expressions to the {@link PathData} item. If all pass then
+   * returns {@link Result#PASS} else returns the result of the first
+   * non-passing expression.
+   */
+  @Override
+  public Result apply(PathData item, int depth) throws IOException {
+    Result result = Result.PASS;
+    for (Expression child : getChildren()) {
+      Result childResult = child.apply(item, -1);
+      result = result.combine(childResult);
+      if (!result.isPass()) {
+        return result;
+      }
+    }
+    return result;
+  }
+
+  @Override
+  public boolean isOperator() {
+    return true;
+  }
+
+  @Override
+  public int getPrecedence() {
+    return 200;
+  }
+
+  @Override
+  public void addChildren(Deque<Expression> expressions) {
+    addChildren(expressions, 2);
+  }
+}

http://git-wip-us.apache.org/repos/asf/hadoop/blob/450561a9/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/shell/find/BaseExpression.java
----------------------------------------------------------------------
diff --git a/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/shell/find/BaseExpression.java b/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/shell/find/BaseExpression.java
new file mode 100644
index 0000000..db7d62f
--- /dev/null
+++ b/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/shell/find/BaseExpression.java
@@ -0,0 +1,302 @@
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.hadoop.fs.shell.find;
+
+import java.io.IOException;
+import java.util.Deque;
+import java.util.LinkedList;
+import java.util.List;
+
+import org.apache.hadoop.conf.Configurable;
+import org.apache.hadoop.conf.Configuration;
+import org.apache.hadoop.fs.FileStatus;
+import org.apache.hadoop.fs.FileSystem;
+import org.apache.hadoop.fs.Path;
+import org.apache.hadoop.fs.shell.PathData;
+
+/**
+ * Abstract expression for use in the
+ * {@link org.apache.hadoop.fs.shell.find.Find} command. Provides default
+ * behavior for a no-argument primary expression.
+ */
+public abstract class BaseExpression implements Expression, Configurable {
+  private String[] usage = { "Not yet implemented" };
+  private String[] help = { "Not yet implemented" };
+
+  /** Sets the usage text for this {@link Expression} */
+  protected void setUsage(String[] usage) {
+    this.usage = usage;
+  }
+
+  /** Sets the help text for this {@link Expression} */
+  protected void setHelp(String[] help) {
+    this.help = help;
+  }
+
+  @Override
+  public String[] getUsage() {
+    return this.usage;
+  }
+
+  @Override
+  public String[] getHelp() {
+    return this.help;
+  }
+
+  @Override
+  public void setOptions(FindOptions options) throws IOException {
+    this.options = options;
+    for (Expression child : getChildren()) {
+      child.setOptions(options);
+    }
+  }
+
+  @Override
+  public void prepare() throws IOException {
+    for (Expression child : getChildren()) {
+      child.prepare();
+    }
+  }
+
+  @Override
+  public void finish() throws IOException {
+    for (Expression child : getChildren()) {
+      child.finish();
+    }
+  }
+
+  /** Options passed in from the {@link Find} command. */
+  private FindOptions options;
+
+  /** Hadoop configuration. */
+  private Configuration conf;
+
+  /** Arguments for this expression. */
+  private LinkedList<String> arguments = new LinkedList<String>();
+
+  /** Children of this expression. */
+  private LinkedList<Expression> children = new LinkedList<Expression>();
+
+  /** Return the options to be used by this expression. */
+  protected FindOptions getOptions() {
+    return (this.options == null) ? new FindOptions() : this.options;
+  }
+
+  @Override
+  public void setConf(Configuration conf) {
+    this.conf = conf;
+  }
+
+  @Override
+  public Configuration getConf() {
+    return this.conf;
+  }
+
+  @Override
+  public String toString() {
+    StringBuilder sb = new StringBuilder();
+    sb.append(getClass().getSimpleName());
+    sb.append("(");
+    boolean firstArg = true;
+    for (String arg : getArguments()) {
+      if (!firstArg) {
+        sb.append(",");
+      } else {
+        firstArg = false;
+      }
+      sb.append(arg);
+    }
+    sb.append(";");
+    firstArg = true;
+    for (Expression child : getChildren()) {
+      if (!firstArg) {
+        sb.append(",");
+      } else {
+        firstArg = false;
+      }
+      sb.append(child.toString());
+    }
+    sb.append(")");
+    return sb.toString();
+  }
+
+  @Override
+  public boolean isAction() {
+    for (Expression child : getChildren()) {
+      if (child.isAction()) {
+        return true;
+      }
+    }
+    return false;
+  }
+
+  @Override
+  public boolean isOperator() {
+    return false;
+  }
+
+  /**
+   * Returns the arguments of this expression
+   *
+   * @return list of argument strings
+   */
+  protected List<String> getArguments() {
+    return this.arguments;
+  }
+
+  /**
+   * Returns the argument at the given position (starting from 1).
+   *
+   * @param position
+   *          argument to be returned
+   * @return requested argument
+   * @throws IOException
+   *           if the argument doesn't exist or is null
+   */
+  protected String getArgument(int position) throws IOException {
+    if (position > this.arguments.size()) {
+      throw new IOException("Missing argument at " + position);
+    }
+    String argument = this.arguments.get(position - 1);
+    if (argument == null) {
+      throw new IOException("Null argument at position " + position);
+    }
+    return argument;
+  }
+
+  /**
+   * Returns the children of this expression.
+   *
+   * @return list of child expressions
+   */
+  protected List<Expression> getChildren() {
+    return this.children;
+  }
+
+  @Override
+  public int getPrecedence() {
+    return 0;
+  }
+
+  @Override
+  public void addChildren(Deque<Expression> exprs) {
+    // no children by default, will be overridden by specific expressions.
+  }
+
+  /**
+   * Add a specific number of children to this expression. The children are
+   * popped off the head of the expressions.
+   *
+   * @param exprs
+   *          deque of expressions from which to take the children
+   * @param count
+   *          number of children to be added
+   */
+  protected void addChildren(Deque<Expression> exprs, int count) {
+    for (int i = 0; i < count; i++) {
+      addChild(exprs.pop());
+    }
+  }
+
+  /**
+   * Add a single argument to this expression. The argument is popped off the
+   * head of the expressions.
+   *
+   * @param expr
+   *          child to add to the expression
+   */
+  private void addChild(Expression expr) {
+    children.push(expr);
+  }
+
+  @Override
+  public void addArguments(Deque<String> args) {
+    // no children by default, will be overridden by specific expressions.
+  }
+
+  /**
+   * Add a specific number of arguments to this expression. The children are
+   * popped off the head of the expressions.
+   *
+   * @param args
+   *          deque of arguments from which to take the argument
+   * @param count
+   *          number of children to be added
+   */
+  protected void addArguments(Deque<String> args, int count) {
+    for (int i = 0; i < count; i++) {
+      addArgument(args.pop());
+    }
+  }
+
+  /**
+   * Add a single argument to this expression. The argument is popped off the
+   * head of the expressions.
+   *
+   * @param arg
+   *          argument to add to the expression
+   */
+  protected void addArgument(String arg) {
+    arguments.add(arg);
+  }
+
+  /**
+   * Returns the {@link FileStatus} from the {@link PathData} item. If the
+   * current options require links to be followed then the returned file status
+   * is that of the linked file.
+   *
+   * @param item
+   *          PathData
+   * @param depth
+   *          current depth in the process directories
+   * @return FileStatus
+   */
+  protected FileStatus getFileStatus(PathData item, int depth)
+      throws IOException {
+    FileStatus fileStatus = item.stat;
+    if (fileStatus.isSymlink()) {
+      if (options.isFollowLink() || (options.isFollowArgLink() &&
+          (depth == 0))) {
+        Path linkedFile = item.fs.resolvePath(fileStatus.getSymlink());
+        fileStatus = getFileSystem(item).getFileStatus(linkedFile);
+      }
+    }
+    return fileStatus;
+  }
+
+  /**
+   * Returns the {@link Path} from the {@link PathData} item.
+   *
+   * @param item
+   *          PathData
+   * @return Path
+   */
+  protected Path getPath(PathData item) throws IOException {
+    return item.path;
+  }
+
+  /**
+   * Returns the {@link FileSystem} associated with the {@link PathData} item.
+   *
+   * @param item PathData
+   * @return FileSystem
+   */
+  protected FileSystem getFileSystem(PathData item) throws IOException {
+    return item.fs;
+  }
+}

http://git-wip-us.apache.org/repos/asf/hadoop/blob/450561a9/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/shell/find/Expression.java
----------------------------------------------------------------------
diff --git a/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/shell/find/Expression.java b/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/shell/find/Expression.java
new file mode 100644
index 0000000..ccad631
--- /dev/null
+++ b/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/shell/find/Expression.java
@@ -0,0 +1,107 @@
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.hadoop.fs.shell.find;
+
+import java.io.IOException;
+import java.util.Deque;
+
+import org.apache.hadoop.fs.shell.PathData;
+
+/**
+ * Interface describing an expression to be used in the
+ * {@link org.apache.hadoop.fs.shell.find.Find} command.
+ */
+public interface Expression {
+  /**
+   * Set the options for this expression, called once before processing any
+   * items.
+   */
+  public void setOptions(FindOptions options) throws IOException;
+
+  /**
+   * Prepares the expression for execution, called once after setting options
+   * and before processing any options.
+   * @throws IOException
+   */
+  public void prepare() throws IOException;
+
+  /**
+   * Apply the expression to the specified item, called once for each item.
+   *
+   * @param item {@link PathData} item to be processed
+   * @param depth distance of the item from the command line argument
+   * @return {@link Result} of applying the expression to the item
+   */
+  public Result apply(PathData item, int depth) throws IOException;
+
+  /**
+   * Finishes the expression, called once after processing all items.
+   *
+   * @throws IOException
+   */
+  public void finish() throws IOException;
+
+  /**
+   * Returns brief usage instructions for this expression. Multiple items should
+   * be returned if there are multiple ways to use this expression.
+   *
+   * @return array of usage instructions
+   */
+  public String[] getUsage();
+
+  /**
+   * Returns a description of the expression for use in help. Multiple lines
+   * should be returned array items. Lines should be formated to 60 characters
+   * or less.
+   *
+   * @return array of description lines
+   */
+  public String[] getHelp();
+
+  /**
+   * Indicates whether this expression performs an action, i.e. provides output
+   * back to the user.
+   */
+  public boolean isAction();
+
+  /** Identifies the expression as an operator rather than a primary. */
+  public boolean isOperator();
+
+  /**
+   * Returns the precedence of this expression
+   * (only applicable to operators).
+   */
+  public int getPrecedence();
+
+  /**
+   * Adds children to this expression. Children are popped from the head of the
+   * deque.
+   *
+   * @param expressions
+   *          deque of expressions from which to take the children
+   */
+  public void addChildren(Deque<Expression> expressions);
+
+  /**
+   * Adds arguments to this expression. Arguments are popped from the head of
+   * the deque and added to the front of the child list, ie last child added is
+   * the first evaluated.
+   * @param args deque of arguments from which to take expression arguments
+   */
+  public void addArguments(Deque<String> args);
+}

http://git-wip-us.apache.org/repos/asf/hadoop/blob/450561a9/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/shell/find/ExpressionFactory.java
----------------------------------------------------------------------
diff --git a/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/shell/find/ExpressionFactory.java b/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/shell/find/ExpressionFactory.java
new file mode 100644
index 0000000..b922a9e
--- /dev/null
+++ b/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/shell/find/ExpressionFactory.java
@@ -0,0 +1,156 @@
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.hadoop.fs.shell.find;
+
+import java.io.IOException;
+import java.lang.reflect.Method;
+import java.util.HashMap;
+import java.util.Map;
+
+import org.apache.hadoop.conf.Configuration;
+import org.apache.hadoop.util.ReflectionUtils;
+import org.apache.hadoop.util.StringUtils;
+
+/**
+ * Factory class for registering and searching for expressions for use in the
+ * {@link org.apache.hadoop.fs.shell.find.Find} command.
+ */
+final class ExpressionFactory {
+  private static final String REGISTER_EXPRESSION_METHOD = "registerExpression";
+  private Map<String, Class<? extends Expression>> expressionMap =
+      new HashMap<String, Class<? extends Expression>>();
+
+  private static final ExpressionFactory INSTANCE = new ExpressionFactory();
+
+  static ExpressionFactory getExpressionFactory() {
+    return INSTANCE;
+  }
+
+  /**
+   * Private constructor to ensure singleton.
+   */
+  private ExpressionFactory() {
+  }
+
+  /**
+   * Invokes "static void registerExpression(FindExpressionFactory)" on the
+   * given class. This method abstracts the contract between the factory and the
+   * expression class. Do not assume that directly invoking registerExpression
+   * on the given class will have the same effect.
+   *
+   * @param expressionClass
+   *          class to allow an opportunity to register
+   */
+  void registerExpression(Class<? extends Expression> expressionClass) {
+    try {
+      Method register = expressionClass.getMethod(REGISTER_EXPRESSION_METHOD,
+          ExpressionFactory.class);
+      if (register != null) {
+        register.invoke(null, this);
+      }
+    } catch (Exception e) {
+      throw new RuntimeException(StringUtils.stringifyException(e));
+    }
+  }
+
+  /**
+   * Register the given class as handling the given list of expression names.
+   *
+   * @param expressionClass
+   *          the class implementing the expression names
+   * @param names
+   *          one or more command names that will invoke this class
+   * @throws IOException
+   *           if the expression is not of an expected type
+   */
+  void addClass(Class<? extends Expression> expressionClass,
+      String... names) throws IOException {
+    for (String name : names)
+      expressionMap.put(name, expressionClass);
+  }
+
+  /**
+   * Determines whether the given expression name represents and actual
+   * expression.
+   *
+   * @param expressionName
+   *          name of the expression
+   * @return true if expressionName represents an expression
+   */
+  boolean isExpression(String expressionName) {
+    return expressionMap.containsKey(expressionName);
+  }
+
+  /**
+   * Get an instance of the requested expression
+   *
+   * @param expressionName
+   *          name of the command to lookup
+   * @param conf
+   *          the Hadoop configuration
+   * @return the {@link Expression} or null if the expression is unknown
+   */
+  Expression getExpression(String expressionName, Configuration conf) {
+    if (conf == null)
+      throw new NullPointerException("configuration is null");
+
+    Class<? extends Expression> expressionClass = expressionMap
+        .get(expressionName);
+    Expression instance = createExpression(expressionClass, conf);
+    return instance;
+  }
+
+  /**
+   * Creates an instance of the requested {@link Expression} class.
+   *
+   * @param expressionClass
+   *          {@link Expression} class to be instantiated
+   * @param conf
+   *          the Hadoop configuration
+   * @return a new instance of the requested {@link Expression} class
+   */
+  Expression createExpression(
+      Class<? extends Expression> expressionClass, Configuration conf) {
+    Expression instance = null;
+    if (expressionClass != null) {
+      instance = ReflectionUtils.newInstance(expressionClass, conf);
+    }
+    return instance;
+  }
+
+  /**
+   * Creates an instance of the requested {@link Expression} class.
+   *
+   * @param expressionClassname
+   *          name of the {@link Expression} class to be instantiated
+   * @param conf
+   *          the Hadoop configuration
+   * @return a new instance of the requested {@link Expression} class
+   */
+  Expression createExpression(String expressionClassname,
+      Configuration conf) {
+    try {
+      Class<? extends Expression> expressionClass = Class.forName(
+          expressionClassname).asSubclass(Expression.class);
+      return createExpression(expressionClass, conf);
+    } catch (ClassNotFoundException e) {
+      throw new IllegalArgumentException("Invalid classname "
+          + expressionClassname);
+    }
+  }
+}

http://git-wip-us.apache.org/repos/asf/hadoop/blob/450561a9/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/shell/find/FilterExpression.java
----------------------------------------------------------------------
diff --git a/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/shell/find/FilterExpression.java b/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/shell/find/FilterExpression.java
new file mode 100644
index 0000000..0ebb0fa
--- /dev/null
+++ b/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/shell/find/FilterExpression.java
@@ -0,0 +1,144 @@
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.hadoop.fs.shell.find;
+
+import java.io.IOException;
+import java.util.Deque;
+
+import org.apache.hadoop.conf.Configurable;
+import org.apache.hadoop.conf.Configuration;
+import org.apache.hadoop.fs.shell.PathData;
+
+/**
+ * Provides an abstract composition filter for the {@link Expression} interface.
+ * Allows other {@link Expression} implementations to be reused without
+ * inheritance.
+ */
+public abstract class FilterExpression implements Expression, Configurable {
+  protected Expression expression;
+
+  protected FilterExpression(Expression expression) {
+    this.expression = expression;
+  }
+
+  @Override
+  public void setOptions(FindOptions options) throws IOException {
+    if (expression != null) {
+      expression.setOptions(options);
+    }
+  }
+
+  @Override
+  public void prepare() throws IOException {
+    if (expression != null) {
+      expression.prepare();
+    }
+  }
+
+  @Override
+  public Result apply(PathData item, int depth) throws IOException {
+    if (expression != null) {
+      return expression.apply(item, -1);
+    }
+    return Result.PASS;
+  }
+
+  @Override
+  public void finish() throws IOException {
+    if (expression != null) {
+      expression.finish();
+    }
+  }
+
+  @Override
+  public String[] getUsage() {
+    if (expression != null) {
+      return expression.getUsage();
+    }
+    return null;
+  }
+
+  @Override
+  public String[] getHelp() {
+    if (expression != null) {
+      return expression.getHelp();
+    }
+    return null;
+  }
+
+  @Override
+  public boolean isAction() {
+    if (expression != null) {
+      return expression.isAction();
+    }
+    return false;
+  }
+
+  @Override
+  public boolean isOperator() {
+    if (expression != null) {
+      return expression.isOperator();
+    }
+    return false;
+  }
+
+  @Override
+  public int getPrecedence() {
+    if (expression != null) {
+      return expression.getPrecedence();
+    }
+    return -1;
+  }
+
+  @Override
+  public void addChildren(Deque<Expression> expressions) {
+    if (expression != null) {
+      expression.addChildren(expressions);
+    }
+  }
+
+  @Override
+  public void addArguments(Deque<String> args) {
+    if (expression != null) {
+      expression.addArguments(args);
+    }
+  }
+
+  @Override
+  public void setConf(Configuration conf) {
+    if (expression instanceof Configurable) {
+      ((Configurable) expression).setConf(conf);
+    }
+  }
+
+  @Override
+  public Configuration getConf() {
+    if (expression instanceof Configurable) {
+      return ((Configurable) expression).getConf();
+    }
+    return null;
+  }
+
+  @Override
+  public String toString() {
+    if (expression != null) {
+      return getClass().getSimpleName() + "-" + expression.toString();
+    }
+    return getClass().getSimpleName();
+  }
+}

http://git-wip-us.apache.org/repos/asf/hadoop/blob/450561a9/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/shell/find/Find.java
----------------------------------------------------------------------
diff --git a/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/shell/find/Find.java b/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/shell/find/Find.java
new file mode 100644
index 0000000..05cd818
--- /dev/null
+++ b/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/shell/find/Find.java
@@ -0,0 +1,444 @@
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.hadoop.fs.shell.find;
+
+import java.io.IOException;
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.Comparator;
+import java.util.Deque;
+import java.util.HashSet;
+import java.util.Iterator;
+import java.util.LinkedList;
+
+import org.apache.hadoop.classification.InterfaceAudience;
+import org.apache.hadoop.classification.InterfaceStability;
+import org.apache.hadoop.fs.Path;
+import org.apache.hadoop.fs.shell.CommandFactory;
+import org.apache.hadoop.fs.shell.CommandFormat;
+import org.apache.hadoop.fs.shell.FsCommand;
+import org.apache.hadoop.fs.shell.PathData;
+
+@InterfaceAudience.Private
+@InterfaceStability.Unstable
+/**
+ * Implements a Hadoop find command.
+ */
+public class Find extends FsCommand {
+  /**
+   * Register the names for the count command
+   * 
+   * @param factory the command factory that will instantiate this class
+   */
+  public static void registerCommands(CommandFactory factory) {
+    factory.addClass(Find.class, "-find");
+  }
+
+  public static final String NAME = "find";
+  public static final String USAGE = "<path> ... <expression> ...";
+  public static final String DESCRIPTION;
+  private static String[] HELP =
+  { "Finds all files that match the specified expression and",
+      "applies selected actions to them. If no <path> is specified",
+      "then defaults to the current working directory. If no",
+      "expression is specified then defaults to -print."
+  };
+
+  private static final String OPTION_FOLLOW_LINK = "L";
+  private static final String OPTION_FOLLOW_ARG_LINK = "H";
+
+  /** List of expressions recognized by this command. */
+  @SuppressWarnings("rawtypes")
+  private static final Class[] EXPRESSIONS;
+
+  static {
+    // Initialize the static variables.
+    EXPRESSIONS = new Class[] {
+        // Operator Expressions
+        And.class,
+        // Action Expressions
+        Print.class,
+        // Navigation Expressions
+        // Matcher Expressions
+        Name.class };
+    DESCRIPTION = buildDescription(ExpressionFactory.getExpressionFactory());
+
+    // Register the expressions with the expression factory.
+    registerExpressions(ExpressionFactory.getExpressionFactory());
+  }
+
+  /** Options for use in this command */
+  private FindOptions options;
+
+  /** Root expression for this instance of the command. */
+  private Expression rootExpression;
+
+  /** Set of path items returning a {@link Result#STOP} result. */
+  private HashSet<Path> stopPaths = new HashSet<Path>();
+
+  /** Register the expressions with the expression factory. */
+  @SuppressWarnings("unchecked")
+  private static void registerExpressions(ExpressionFactory factory) {
+    for (Class<? extends Expression> exprClass : EXPRESSIONS) {
+      factory.registerExpression(exprClass);
+    }
+  }
+
+  /** Build the description used by the help command. */
+  @SuppressWarnings("unchecked")
+  private static String buildDescription(ExpressionFactory factory) {
+    ArrayList<Expression> operators = new ArrayList<Expression>();
+    ArrayList<Expression> primaries = new ArrayList<Expression>();
+    for (Class<? extends Expression> exprClass : EXPRESSIONS) {
+      Expression expr = factory.createExpression(exprClass, null);
+      if (expr.isOperator()) {
+        operators.add(expr);
+      } else {
+        primaries.add(expr);
+      }
+    }
+    Collections.sort(operators, new Comparator<Expression>() {
+      @Override
+      public int compare(Expression arg0, Expression arg1) {
+        return arg0.getClass().getName().compareTo(arg1.getClass().getName());
+      }
+    });
+    Collections.sort(primaries, new Comparator<Expression>() {
+      @Override
+      public int compare(Expression arg0, Expression arg1) {
+        return arg0.getClass().getName().compareTo(arg1.getClass().getName());
+      }
+    });
+
+    StringBuilder sb = new StringBuilder();
+    for (String line : HELP) {
+      sb.append(line).append("\n");
+    }
+    sb.append("\n");
+    sb.append("The following primary expressions are recognised:\n");
+    for (Expression expr : primaries) {
+      for (String line : expr.getUsage()) {
+        sb.append("  ").append(line).append("\n");
+      }
+      for (String line : expr.getHelp()) {
+        sb.append("    ").append(line).append("\n");
+      }
+      sb.append("\n");
+    }
+    sb.append("The following operators are recognised:\n");
+    for (Expression expr : operators) {
+      for (String line : expr.getUsage()) {
+        sb.append("  ").append(line).append("\n");
+      }
+      for (String line : expr.getHelp()) {
+        sb.append("    ").append(line).append("\n");
+      }
+      sb.append("\n");
+    }
+    return sb.toString();
+  }
+
+  /** Default constructor for the Find command. */
+  public Find() {
+    setRecursive(true);
+  }
+
+  @Override
+  protected void processOptions(LinkedList<String> args) throws IOException {
+    CommandFormat cf =
+        new CommandFormat(1, Integer.MAX_VALUE, OPTION_FOLLOW_LINK,
+            OPTION_FOLLOW_ARG_LINK, null);
+    cf.parse(args);
+
+    if (cf.getOpt(OPTION_FOLLOW_LINK)) {
+      getOptions().setFollowLink(true);
+    } else if (cf.getOpt(OPTION_FOLLOW_ARG_LINK)) {
+      getOptions().setFollowArgLink(true);
+    }
+
+    // search for first non-path argument (ie starts with a "-") and capture and
+    // remove the remaining arguments as expressions
+    LinkedList<String> expressionArgs = new LinkedList<String>();
+    Iterator<String> it = args.iterator();
+    boolean isPath = true;
+    while (it.hasNext()) {
+      String arg = it.next();
+      if (isPath) {
+        if (arg.startsWith("-")) {
+          isPath = false;
+        }
+      }
+      if (!isPath) {
+        expressionArgs.add(arg);
+        it.remove();
+      }
+    }
+
+    if (args.isEmpty()) {
+      args.add(Path.CUR_DIR);
+    }
+
+    Expression expression = parseExpression(expressionArgs);
+    if (!expression.isAction()) {
+      Expression and = getExpression(And.class);
+      Deque<Expression> children = new LinkedList<Expression>();
+      children.add(getExpression(Print.class));
+      children.add(expression);
+      and.addChildren(children);
+      expression = and;
+    }
+
+    setRootExpression(expression);
+  }
+
+  /**
+   * Set the root expression for this find.
+   * 
+   * @param expression
+   */
+  @InterfaceAudience.Private
+  void setRootExpression(Expression expression) {
+    this.rootExpression = expression;
+  }
+
+  /**
+   * Return the root expression for this find.
+   * 
+   * @return the root expression
+   */
+  @InterfaceAudience.Private
+  Expression getRootExpression() {
+    return this.rootExpression;
+  }
+
+  /** Returns the current find options, creating them if necessary. */
+  @InterfaceAudience.Private
+  FindOptions getOptions() {
+    if (options == null) {
+      options = createOptions();
+    }
+    return options;
+  }
+
+  /** Create a new set of find options. */
+  private FindOptions createOptions() {
+    FindOptions options = new FindOptions();
+    options.setOut(out);
+    options.setErr(err);
+    options.setIn(System.in);
+    options.setCommandFactory(getCommandFactory());
+    options.setConfiguration(getConf());
+    return options;
+  }
+
+  /** Add the {@link PathData} item to the stop set. */
+  private void addStop(PathData item) {
+    stopPaths.add(item.path);
+  }
+
+  /** Returns true if the {@link PathData} item is in the stop set. */
+  private boolean isStop(PathData item) {
+    return stopPaths.contains(item.path);
+  }
+
+  /**
+   * Parse a list of arguments to to extract the {@link Expression} elements.
+   * The input Deque will be modified to remove the used elements.
+   * 
+   * @param args arguments to be parsed
+   * @return list of {@link Expression} elements applicable to this command
+   * @throws IOException if list can not be parsed
+   */
+  private Expression parseExpression(Deque<String> args) throws IOException {
+    Deque<Expression> primaries = new LinkedList<Expression>();
+    Deque<Expression> operators = new LinkedList<Expression>();
+    Expression prevExpr = getExpression(And.class);
+    while (!args.isEmpty()) {
+      String arg = args.pop();
+      if ("(".equals(arg)) {
+        Expression expr = parseExpression(args);
+        primaries.add(expr);
+        prevExpr = new BaseExpression() {
+          @Override
+          public Result apply(PathData item, int depth) throws IOException {
+            return Result.PASS;
+          }
+        }; // stub the previous expression to be a non-op
+      } else if (")".equals(arg)) {
+        break;
+      } else if (isExpression(arg)) {
+        Expression expr = getExpression(arg);
+        expr.addArguments(args);
+        if (expr.isOperator()) {
+          while (!operators.isEmpty()) {
+            if (operators.peek().getPrecedence() >= expr.getPrecedence()) {
+              Expression op = operators.pop();
+              op.addChildren(primaries);
+              primaries.push(op);
+            } else {
+              break;
+            }
+          }
+          operators.push(expr);
+        } else {
+          if (!prevExpr.isOperator()) {
+            Expression and = getExpression(And.class);
+            while (!operators.isEmpty()) {
+              if (operators.peek().getPrecedence() >= and.getPrecedence()) {
+                Expression op = operators.pop();
+                op.addChildren(primaries);
+                primaries.push(op);
+              } else {
+                break;
+              }
+            }
+            operators.push(and);
+          }
+          primaries.push(expr);
+        }
+        prevExpr = expr;
+      } else {
+        throw new IOException("Unexpected argument: " + arg);
+      }
+    }
+
+    while (!operators.isEmpty()) {
+      Expression operator = operators.pop();
+      operator.addChildren(primaries);
+      primaries.push(operator);
+    }
+
+    return primaries.isEmpty() ? getExpression(Print.class) : primaries.pop();
+  }
+
+  /** Returns true if the target is an ancestor of the source. */
+  private boolean isAncestor(PathData source, PathData target) {
+    for (Path parent = source.path; (parent != null) && !parent.isRoot();
+        parent = parent.getParent()) {
+      if (parent.equals(target.path)) {
+        return true;
+      }
+    }
+    return false;
+  }
+
+  @Override
+  protected void recursePath(PathData item) throws IOException {
+    if (isStop(item)) {
+      // this item returned a stop result so don't recurse any further
+      return;
+    }
+    if (getDepth() >= getOptions().getMaxDepth()) {
+      // reached the maximum depth so don't got any further.
+      return;
+    }
+    if (item.stat.isSymlink() && getOptions().isFollowLink()) {
+      PathData linkedItem =
+          new PathData(item.stat.getSymlink().toString(), getConf());
+      if (isAncestor(item, linkedItem)) {
+        getOptions().getErr().println(
+            "Infinite loop ignored: " + item.toString() + " -> "
+                + linkedItem.toString());
+        return;
+      }
+      if (linkedItem.exists) {
+        item = linkedItem;
+      }
+    }
+    if (item.stat.isDirectory()) {
+      super.recursePath(item);
+    }
+  }
+
+  @Override
+  protected boolean isPathRecursable(PathData item) throws IOException {
+    if (item.stat.isDirectory()) {
+      return true;
+    }
+    if (item.stat.isSymlink()) {
+      PathData linkedItem =
+          new PathData(item.fs.resolvePath(item.stat.getSymlink()).toString(),
+              getConf());
+      if (linkedItem.stat.isDirectory()) {
+        if (getOptions().isFollowLink()) {
+          return true;
+        }
+        if (getOptions().isFollowArgLink() && (getDepth() == 0)) {
+          return true;
+        }
+      }
+    }
+    return false;
+  }
+
+  @Override
+  protected void processPath(PathData item) throws IOException {
+    if (getOptions().isDepthFirst()) {
+      // depth first so leave until post processing
+      return;
+    }
+    applyItem(item);
+  }
+
+  @Override
+  protected void postProcessPath(PathData item) throws IOException {
+    if (!getOptions().isDepthFirst()) {
+      // not depth first so already processed
+      return;
+    }
+    applyItem(item);
+  }
+
+  private void applyItem(PathData item) throws IOException {
+    if (getDepth() >= getOptions().getMinDepth()) {
+      Result result = getRootExpression().apply(item, getDepth());
+      if (Result.STOP.equals(result)) {
+        addStop(item);
+      }
+    }
+  }
+
+  @Override
+  protected void processArguments(LinkedList<PathData> args)
+      throws IOException {
+    Expression expr = getRootExpression();
+    expr.setOptions(getOptions());
+    expr.prepare();
+    super.processArguments(args);
+    expr.finish();
+  }
+
+  /** Gets a named expression from the factory. */
+  private Expression getExpression(String expressionName) {
+    return ExpressionFactory.getExpressionFactory().getExpression(
+        expressionName, getConf());
+  }
+
+  /** Gets an instance of an expression from the factory. */
+  private Expression getExpression(
+      Class<? extends Expression> expressionClass) {
+    return ExpressionFactory.getExpressionFactory().createExpression(
+        expressionClass, getConf());
+  }
+
+  /** Asks the factory whether an expression is recognized. */
+  private boolean isExpression(String expressionName) {
+    return ExpressionFactory.getExpressionFactory()
+        .isExpression(expressionName);
+  }
+}

http://git-wip-us.apache.org/repos/asf/hadoop/blob/450561a9/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/shell/find/FindOptions.java
----------------------------------------------------------------------
diff --git a/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/shell/find/FindOptions.java b/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/shell/find/FindOptions.java
new file mode 100644
index 0000000..b0f1be5
--- /dev/null
+++ b/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/shell/find/FindOptions.java
@@ -0,0 +1,271 @@
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.hadoop.fs.shell.find;
+
+import java.io.InputStream;
+import java.io.PrintStream;
+import java.util.Date;
+
+import org.apache.hadoop.conf.Configuration;
+import org.apache.hadoop.fs.shell.CommandFactory;
+
+/**
+ * Options to be used by the {@link Find} command and its {@link Expression}s.
+ */
+public class FindOptions {
+  /** Output stream to be used. */
+  private PrintStream out;
+
+  /** Error stream to be used. */
+  private PrintStream err;
+
+  /** Input stream to be used. */
+  private InputStream in;
+
+  /**
+   * Indicates whether the expression should be applied to the directory tree
+   * depth first.
+   */
+  private boolean depthFirst = false;
+
+  /** Indicates whether symbolic links should be followed. */
+  private boolean followLink = false;
+
+  /**
+   * Indicates whether symbolic links specified as command arguments should be
+   * followed.
+   */
+  private boolean followArgLink = false;
+
+  /** Start time of the find process. */
+  private long startTime = new Date().getTime();
+
+  /**
+   * Depth at which to start applying expressions.
+   */
+  private int minDepth = 0;
+
+  /**
+   * Depth at which to stop applying expressions.
+   */
+  private int maxDepth = Integer.MAX_VALUE;
+
+  /** Factory for retrieving command classes. */
+  private CommandFactory commandFactory;
+
+  /** Configuration object. */
+  private Configuration configuration = new Configuration();
+
+  /**
+   * Sets the output stream to be used.
+   *
+   * @param out output stream to be used
+   */
+  public void setOut(PrintStream out) {
+    this.out = out;
+  }
+
+  /**
+   * Returns the output stream to be used.
+   *
+   * @return output stream to be used
+   */
+  public PrintStream getOut() {
+    return this.out;
+  }
+
+  /**
+   * Sets the error stream to be used.
+   *
+   * @param err error stream to be used
+   */
+  public void setErr(PrintStream err) {
+    this.err = err;
+  }
+
+  /**
+   * Returns the error stream to be used.
+   *
+   * @return error stream to be used
+   */
+  public PrintStream getErr() {
+    return this.err;
+  }
+
+  /**
+   * Sets the input stream to be used.
+   *
+   * @param in input stream to be used
+   */
+  public void setIn(InputStream in) {
+    this.in = in;
+  }
+
+  /**
+   * Returns the input stream to be used.
+   *
+   * @return input stream to be used
+   */
+  public InputStream getIn() {
+    return this.in;
+  }
+
+  /**
+   * Sets flag indicating whether the expression should be applied to the
+   * directory tree depth first.
+   *
+   * @param depthFirst true indicates depth first traversal
+   */
+  public void setDepthFirst(boolean depthFirst) {
+    this.depthFirst = depthFirst;
+  }
+
+  /**
+   * Should directory tree be traversed depth first?
+   *
+   * @return true indicate depth first traversal
+   */
+  public boolean isDepthFirst() {
+    return this.depthFirst;
+  }
+
+  /**
+   * Sets flag indicating whether symbolic links should be followed.
+   *
+   * @param followLink true indicates follow links
+   */
+  public void setFollowLink(boolean followLink) {
+    this.followLink = followLink;
+  }
+
+  /**
+   * Should symbolic links be follows?
+   *
+   * @return true indicates links should be followed
+   */
+  public boolean isFollowLink() {
+    return this.followLink;
+  }
+
+  /**
+   * Sets flag indicating whether command line symbolic links should be
+   * followed.
+   *
+   * @param followArgLink true indicates follow links
+   */
+  public void setFollowArgLink(boolean followArgLink) {
+    this.followArgLink = followArgLink;
+  }
+
+  /**
+   * Should command line symbolic links be follows?
+   *
+   * @return true indicates links should be followed
+   */
+  public boolean isFollowArgLink() {
+    return this.followArgLink;
+  }
+
+  /**
+   * Returns the start time of this {@link Find} command.
+   *
+   * @return start time (in milliseconds since epoch)
+   */
+  public long getStartTime() {
+    return this.startTime;
+  }
+
+  /**
+   * Set the start time of this {@link Find} command.
+   *
+   * @param time start time (in milliseconds since epoch)
+   */
+  public void setStartTime(long time) {
+    this.startTime = time;
+  }
+
+  /**
+   * Returns the minimum depth for applying expressions.
+   *
+   * @return min depth
+   */
+  public int getMinDepth() {
+    return this.minDepth;
+  }
+
+  /**
+   * Sets the minimum depth for applying expressions.
+   *
+   * @param minDepth minimum depth
+   */
+  public void setMinDepth(int minDepth) {
+    this.minDepth = minDepth;
+  }
+
+  /**
+   * Returns the maximum depth for applying expressions.
+   *
+   * @return maximum depth
+   */
+  public int getMaxDepth() {
+    return this.maxDepth;
+  }
+
+  /**
+   * Sets the maximum depth for applying expressions.
+   *
+   * @param maxDepth maximum depth
+   */
+  public void setMaxDepth(int maxDepth) {
+    this.maxDepth = maxDepth;
+  }
+
+  /**
+   * Set the command factory.
+   *
+   * @param factory {@link CommandFactory}
+   */
+  public void setCommandFactory(CommandFactory factory) {
+    this.commandFactory = factory;
+  }
+
+  /**
+   * Return the command factory.
+   *
+   * @return {@link CommandFactory}
+   */
+  public CommandFactory getCommandFactory() {
+    return this.commandFactory;
+  }
+
+  /**
+   * Set the {@link Configuration}
+   *
+   * @param configuration {@link Configuration}
+   */
+  public void setConfiguration(Configuration configuration) {
+    this.configuration = configuration;
+  }
+
+  /**
+   * Return the {@link Configuration} return configuration {@link Configuration}
+   */
+  public Configuration getConfiguration() {
+    return this.configuration;
+  }
+}

http://git-wip-us.apache.org/repos/asf/hadoop/blob/450561a9/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/shell/find/Name.java
----------------------------------------------------------------------
diff --git a/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/shell/find/Name.java b/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/shell/find/Name.java
new file mode 100644
index 0000000..88314c6
--- /dev/null
+++ b/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/shell/find/Name.java
@@ -0,0 +1,100 @@
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.hadoop.fs.shell.find;
+
+import java.io.IOException;
+import java.util.Deque;
+
+import org.apache.hadoop.fs.GlobPattern;
+import org.apache.hadoop.fs.shell.PathData;
+
+/**
+ * Implements the -name expression for the
+ * {@link org.apache.hadoop.fs.shell.find.Find} command.
+ */
+final class Name extends BaseExpression {
+  /** Registers this expression with the specified factory. */
+  public static void registerExpression(ExpressionFactory factory)
+      throws IOException {
+    factory.addClass(Name.class, "-name");
+    factory.addClass(Iname.class, "-iname");
+  }
+
+  private static final String[] USAGE = { "-name pattern", "-iname pattern" };
+  private static final String[] HELP = {
+      "Evaluates as true if the basename of the file matches the",
+      "pattern using standard file system globbing.",
+      "If -iname is used then the match is case insensitive." };
+  private GlobPattern globPattern;
+  private boolean caseSensitive = true;
+
+  /** Creates a case sensitive name expression. */
+  public Name() {
+    this(true);
+  }
+
+  /**
+   * Construct a Name {@link Expression} with a specified case sensitivity.
+   *
+   * @param caseSensitive if true the comparisons are case sensitive.
+   */
+  private Name(boolean caseSensitive) {
+    super();
+    setUsage(USAGE);
+    setHelp(HELP);
+    setCaseSensitive(caseSensitive);
+  }
+
+  private void setCaseSensitive(boolean caseSensitive) {
+    this.caseSensitive = caseSensitive;
+  }
+
+  @Override
+  public void addArguments(Deque<String> args) {
+    addArguments(args, 1);
+  }
+
+  @Override
+  public void prepare() throws IOException {
+    String argPattern = getArgument(1);
+    if (!caseSensitive) {
+      argPattern = argPattern.toLowerCase();
+    }
+    globPattern = new GlobPattern(argPattern);
+  }
+
+  @Override
+  public Result apply(PathData item, int depth) throws IOException {
+    String name = getPath(item).getName();
+    if (!caseSensitive) {
+      name = name.toLowerCase();
+    }
+    if (globPattern.matches(name)) {
+      return Result.PASS;
+    } else {
+      return Result.FAIL;
+    }
+  }
+
+  /** Case insensitive version of the -name expression. */
+  static class Iname extends FilterExpression {
+    public Iname() {
+      super(new Name(false));
+    }
+  }
+}

http://git-wip-us.apache.org/repos/asf/hadoop/blob/450561a9/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/shell/find/Print.java
----------------------------------------------------------------------
diff --git a/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/shell/find/Print.java b/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/shell/find/Print.java
new file mode 100644
index 0000000..ae99779
--- /dev/null
+++ b/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/shell/find/Print.java
@@ -0,0 +1,76 @@
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.hadoop.fs.shell.find;
+
+import java.io.IOException;
+
+import org.apache.hadoop.fs.shell.PathData;
+
+/**
+ * Implements the -print expression for the
+ * {@link org.apache.hadoop.fs.shell.find.Find} command.
+ */
+final class Print extends BaseExpression {
+  /** Registers this expression with the specified factory. */
+  public static void registerExpression(ExpressionFactory factory)
+      throws IOException {
+    factory.addClass(Print.class, "-print");
+    factory.addClass(Print0.class, "-print0");
+  }
+
+  private static final String[] USAGE = { "-print", "-print0" };
+  private static final String[] HELP = {
+      "Always evaluates to true. Causes the current pathname to be",
+      "written to standard output followed by a newline. If the -print0",
+      "expression is used then an ASCII NULL character is appended rather",
+      "than a newline." };
+
+  private final String suffix;
+
+  public Print() {
+    this("\n");
+  }
+
+  /**
+   * Construct a Print {@link Expression} with the specified suffix.
+   */
+  private Print(String suffix) {
+    super();
+    setUsage(USAGE);
+    setHelp(HELP);
+    this.suffix = suffix;
+  }
+
+  @Override
+  public Result apply(PathData item, int depth) throws IOException {
+    getOptions().getOut().print(item.toString() + suffix);
+    return Result.PASS;
+  }
+
+  @Override
+  public boolean isAction() {
+    return true;
+  }
+
+  /** Implements the -print0 expression. */
+  final static class Print0 extends FilterExpression {
+    public Print0() {
+      super(new Print("\0"));
+    }
+  }
+}

http://git-wip-us.apache.org/repos/asf/hadoop/blob/450561a9/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/shell/find/Result.java
----------------------------------------------------------------------
diff --git a/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/shell/find/Result.java b/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/shell/find/Result.java
new file mode 100644
index 0000000..2ef9cb4
--- /dev/null
+++ b/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/shell/find/Result.java
@@ -0,0 +1,88 @@
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.hadoop.fs.shell.find;
+
+public final class Result {
+  /** Result indicating {@link Expression} processing should continue. */
+  public static final Result PASS = new Result(true, true);
+  /** Result indicating {@link Expression} processing should stop. */
+  public static final Result FAIL = new Result(false, true);
+  /**
+   * Result indicating {@link Expression} processing should not descend any more
+   * directories.
+   */
+  public static final Result STOP = new Result(true, false);
+  private boolean descend;
+  private boolean success;
+
+  private Result(boolean success, boolean recurse) {
+    this.success = success;
+    this.descend = recurse;
+  }
+
+  /** Should further directories be descended. */
+  public boolean isDescend() {
+    return this.descend;
+  }
+
+  /** Should processing continue. */
+  public boolean isPass() {
+    return this.success;
+  }
+
+  /** Returns the combination of this and another result. */
+  public Result combine(Result other) {
+    return new Result(this.isPass() && other.isPass(), this.isDescend()
+        && other.isDescend());
+  }
+
+  /** Negate this result. */
+  public Result negate() {
+    return new Result(!this.isPass(), this.isDescend());
+  }
+
+  @Override
+  public String toString() {
+    return "success=" + isPass() + "; recurse=" + isDescend();
+  }
+
+  @Override
+  public int hashCode() {
+    final int prime = 31;
+    int result = 1;
+    result = prime * result + (descend ? 1231 : 1237);
+    result = prime * result + (success ? 1231 : 1237);
+    return result;
+  }
+
+  @Override
+  public boolean equals(Object obj) {
+    if (this == obj)
+      return true;
+    if (obj == null)
+      return false;
+    if (getClass() != obj.getClass())
+      return false;
+    Result other = (Result) obj;
+    if (descend != other.descend)
+      return false;
+    if (success != other.success)
+      return false;
+    return true;
+  }
+}

http://git-wip-us.apache.org/repos/asf/hadoop/blob/450561a9/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/fs/shell/find/MockFileSystem.java
----------------------------------------------------------------------
diff --git a/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/fs/shell/find/MockFileSystem.java b/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/fs/shell/find/MockFileSystem.java
new file mode 100644
index 0000000..44abd23
--- /dev/null
+++ b/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/fs/shell/find/MockFileSystem.java
@@ -0,0 +1,86 @@
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.hadoop.fs.shell.find;
+
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.reset;
+import static org.mockito.Mockito.when;
+
+import java.io.IOException;
+import java.net.URI;
+
+import org.apache.hadoop.conf.Configuration;
+import org.apache.hadoop.fs.FileStatus;
+import org.apache.hadoop.fs.FileSystem;
+import org.apache.hadoop.fs.FilterFileSystem;
+import org.apache.hadoop.fs.Path;
+
+/**
+ * A mock {@link FileSystem} for use with the {@link Find} unit tests. Usage:
+ * FileSystem mockFs = MockFileSystem.setup(); Methods in the mockFs can then be
+ * mocked out by the test script. The {@link Configuration} can be accessed by
+ * mockFs.getConf(); The following methods are fixed within the class: -
+ * {@link FileSystem#initialize(URI,Configuration)} blank stub -
+ * {@link FileSystem#makeQualified(Path)} returns the passed in {@link Path} -
+ * {@link FileSystem#getWorkingDirectory} returns new Path("/") -
+ * {@link FileSystem#resolvePath(Path)} returns the passed in {@link Path}
+ */
+class MockFileSystem extends FilterFileSystem {
+  private static FileSystem mockFs = null;
+
+  /** Setup and return the underlying {@link FileSystem} mock */
+  static FileSystem setup() throws IOException {
+    if (mockFs == null) {
+      mockFs = mock(FileSystem.class);
+    }
+    reset(mockFs);
+    Configuration conf = new Configuration();
+    conf.set("fs.defaultFS", "mockfs:///");
+    conf.setClass("fs.mockfs.impl", MockFileSystem.class, FileSystem.class);
+    when(mockFs.getConf()).thenReturn(conf);
+    return mockFs;
+  }
+
+  private MockFileSystem() {
+    super(mockFs);
+  }
+
+  @Override
+  public void initialize(URI uri, Configuration conf) {
+  }
+
+  @Override
+  public Path makeQualified(Path path) {
+    return path;
+  }
+
+  @Override
+  public FileStatus[] globStatus(Path pathPattern) throws IOException {
+    return fs.globStatus(pathPattern);
+  }
+
+  @Override
+  public Path getWorkingDirectory() {
+    return new Path("/");
+  }
+
+  @Override
+  public Path resolvePath(final Path p) throws IOException {
+    return p;
+  }
+}

http://git-wip-us.apache.org/repos/asf/hadoop/blob/450561a9/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/fs/shell/find/TestAnd.java
----------------------------------------------------------------------
diff --git a/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/fs/shell/find/TestAnd.java b/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/fs/shell/find/TestAnd.java
new file mode 100644
index 0000000..d82a25e
--- /dev/null
+++ b/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/fs/shell/find/TestAnd.java
@@ -0,0 +1,263 @@
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.hadoop.fs.shell.find;
+
+import static org.junit.Assert.*;
+import static org.mockito.Mockito.*;
+
+import java.io.IOException;
+import java.util.Deque;
+import java.util.LinkedList;
+
+import org.apache.hadoop.fs.shell.PathData;
+import org.junit.Test;
+
+public class TestAnd {
+
+  // test all expressions passing
+  @Test(timeout = 1000)
+  public void testPass() throws IOException {
+    And and = new And();
+
+    PathData pathData = mock(PathData.class);
+
+    Expression first = mock(Expression.class);
+    when(first.apply(pathData, -1)).thenReturn(Result.PASS);
+
+    Expression second = mock(Expression.class);
+    when(second.apply(pathData, -1)).thenReturn(Result.PASS);
+
+    Deque<Expression> children = new LinkedList<Expression>();
+    children.add(second);
+    children.add(first);
+    and.addChildren(children);
+
+    assertEquals(Result.PASS, and.apply(pathData, -1));
+    verify(first).apply(pathData, -1);
+    verify(second).apply(pathData, -1);
+    verifyNoMoreInteractions(first);
+    verifyNoMoreInteractions(second);
+  }
+
+  // test the first expression failing
+  @Test(timeout = 1000)
+  public void testFailFirst() throws IOException {
+    And and = new And();
+
+    PathData pathData = mock(PathData.class);
+
+    Expression first = mock(Expression.class);
+    when(first.apply(pathData, -1)).thenReturn(Result.FAIL);
+
+    Expression second = mock(Expression.class);
+    when(second.apply(pathData, -1)).thenReturn(Result.PASS);
+
+    Deque<Expression> children = new LinkedList<Expression>();
+    children.add(second);
+    children.add(first);
+    and.addChildren(children);
+
+    assertEquals(Result.FAIL, and.apply(pathData, -1));
+    verify(first).apply(pathData, -1);
+    verifyNoMoreInteractions(first);
+    verifyNoMoreInteractions(second);
+  }
+
+  // test the second expression failing
+  @Test(timeout = 1000)
+  public void testFailSecond() throws IOException {
+    And and = new And();
+
+    PathData pathData = mock(PathData.class);
+
+    Expression first = mock(Expression.class);
+    when(first.apply(pathData, -1)).thenReturn(Result.PASS);
+
+    Expression second = mock(Expression.class);
+    when(second.apply(pathData, -1)).thenReturn(Result.FAIL);
+
+    Deque<Expression> children = new LinkedList<Expression>();
+    children.add(second);
+    children.add(first);
+    and.addChildren(children);
+
+    assertEquals(Result.FAIL, and.apply(pathData, -1));
+    verify(first).apply(pathData, -1);
+    verify(second).apply(pathData, -1);
+    verifyNoMoreInteractions(first);
+    verifyNoMoreInteractions(second);
+  }
+
+  // test both expressions failing
+  @Test(timeout = 1000)
+  public void testFailBoth() throws IOException {
+    And and = new And();
+
+    PathData pathData = mock(PathData.class);
+
+    Expression first = mock(Expression.class);
+    when(first.apply(pathData, -1)).thenReturn(Result.FAIL);
+
+    Expression second = mock(Expression.class);
+    when(second.apply(pathData, -1)).thenReturn(Result.FAIL);
+
+    Deque<Expression> children = new LinkedList<Expression>();
+    children.add(second);
+    children.add(first);
+    and.addChildren(children);
+
+    assertEquals(Result.FAIL, and.apply(pathData, -1));
+    verify(first).apply(pathData, -1);
+    verifyNoMoreInteractions(first);
+    verifyNoMoreInteractions(second);
+  }
+
+  // test the first expression stopping
+  @Test(timeout = 1000)
+  public void testStopFirst() throws IOException {
+    And and = new And();
+
+    PathData pathData = mock(PathData.class);
+
+    Expression first = mock(Expression.class);
+    when(first.apply(pathData, -1)).thenReturn(Result.STOP);
+
+    Expression second = mock(Expression.class);
+    when(second.apply(pathData, -1)).thenReturn(Result.PASS);
+
+    Deque<Expression> children = new LinkedList<Expression>();
+    children.add(second);
+    children.add(first);
+    and.addChildren(children);
+
+    assertEquals(Result.STOP, and.apply(pathData, -1));
+    verify(first).apply(pathData, -1);
+    verify(second).apply(pathData, -1);
+    verifyNoMoreInteractions(first);
+    verifyNoMoreInteractions(second);
+  }
+
+  // test the second expression stopping
+  @Test(timeout = 1000)
+  public void testStopSecond() throws IOException {
+    And and = new And();
+
+    PathData pathData = mock(PathData.class);
+
+    Expression first = mock(Expression.class);
+    when(first.apply(pathData, -1)).thenReturn(Result.PASS);
+
+    Expression second = mock(Expression.class);
+    when(second.apply(pathData, -1)).thenReturn(Result.STOP);
+
+    Deque<Expression> children = new LinkedList<Expression>();
+    children.add(second);
+    children.add(first);
+    and.addChildren(children);
+
+    assertEquals(Result.STOP, and.apply(pathData, -1));
+    verify(first).apply(pathData, -1);
+    verify(second).apply(pathData, -1);
+    verifyNoMoreInteractions(first);
+    verifyNoMoreInteractions(second);
+  }
+
+  // test first expression stopping and second failing
+  @Test(timeout = 1000)
+  public void testStopFail() throws IOException {
+    And and = new And();
+
+    PathData pathData = mock(PathData.class);
+
+    Expression first = mock(Expression.class);
+    when(first.apply(pathData, -1)).thenReturn(Result.STOP);
+
+    Expression second = mock(Expression.class);
+    when(second.apply(pathData, -1)).thenReturn(Result.FAIL);
+
+    Deque<Expression> children = new LinkedList<Expression>();
+    children.add(second);
+    children.add(first);
+    and.addChildren(children);
+
+    assertEquals(Result.STOP.combine(Result.FAIL), and.apply(pathData, -1));
+    verify(first).apply(pathData, -1);
+    verify(second).apply(pathData, -1);
+    verifyNoMoreInteractions(first);
+    verifyNoMoreInteractions(second);
+  }
+
+  // test setOptions is called on child
+  @Test(timeout = 1000)
+  public void testSetOptions() throws IOException {
+    And and = new And();
+    Expression first = mock(Expression.class);
+    Expression second = mock(Expression.class);
+
+    Deque<Expression> children = new LinkedList<Expression>();
+    children.add(second);
+    children.add(first);
+    and.addChildren(children);
+
+    FindOptions options = mock(FindOptions.class);
+    and.setOptions(options);
+    verify(first).setOptions(options);
+    verify(second).setOptions(options);
+    verifyNoMoreInteractions(first);
+    verifyNoMoreInteractions(second);
+  }
+
+  // test prepare is called on child
+  @Test(timeout = 1000)
+  public void testPrepare() throws IOException {
+    And and = new And();
+    Expression first = mock(Expression.class);
+    Expression second = mock(Expression.class);
+
+    Deque<Expression> children = new LinkedList<Expression>();
+    children.add(second);
+    children.add(first);
+    and.addChildren(children);
+
+    and.prepare();
+    verify(first).prepare();
+    verify(second).prepare();
+    verifyNoMoreInteractions(first);
+    verifyNoMoreInteractions(second);
+  }
+
+  // test finish is called on child
+  @Test(timeout = 1000)
+  public void testFinish() throws IOException {
+    And and = new And();
+    Expression first = mock(Expression.class);
+    Expression second = mock(Expression.class);
+
+    Deque<Expression> children = new LinkedList<Expression>();
+    children.add(second);
+    children.add(first);
+    and.addChildren(children);
+
+    and.finish();
+    verify(first).finish();
+    verify(second).finish();
+    verifyNoMoreInteractions(first);
+    verifyNoMoreInteractions(second);
+  }
+}

http://git-wip-us.apache.org/repos/asf/hadoop/blob/450561a9/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/fs/shell/find/TestFilterExpression.java
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diff --git a/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/fs/shell/find/TestFilterExpression.java b/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/fs/shell/find/TestFilterExpression.java
new file mode 100644
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+++ b/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/fs/shell/find/TestFilterExpression.java
@@ -0,0 +1,145 @@
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.hadoop.fs.shell.find;
+
+import static org.junit.Assert.*;
+import static org.mockito.Mockito.*;
+
+import java.io.IOException;
+import java.util.Deque;
+
+import org.apache.hadoop.fs.shell.PathData;
+
+import org.junit.Before;
+import org.junit.Test;
+
+public class TestFilterExpression {
+  private Expression expr;
+  private FilterExpression test;
+
+  @Before
+  public void setup() {
+    expr = mock(Expression.class);
+    test = new FilterExpression(expr) {
+    };
+  }
+
+  // test that the child expression is correctly set
+  @Test(timeout = 1000)
+  public void expression() throws IOException {
+    assertEquals(expr, test.expression);
+  }
+
+  // test that setOptions method is called
+  @Test(timeout = 1000)
+  public void setOptions() throws IOException {
+    FindOptions options = mock(FindOptions.class);
+    test.setOptions(options);
+    verify(expr).setOptions(options);
+    verifyNoMoreInteractions(expr);
+  }
+
+  // test the apply method is called and the result returned
+  @Test(timeout = 1000)
+  public void apply() throws IOException {
+    PathData item = mock(PathData.class);
+    when(expr.apply(item, -1)).thenReturn(Result.PASS).thenReturn(Result.FAIL);
+    assertEquals(Result.PASS, test.apply(item, -1));
+    assertEquals(Result.FAIL, test.apply(item, -1));
+    verify(expr, times(2)).apply(item, -1);
+    verifyNoMoreInteractions(expr);
+  }
+
+  // test that the finish method is called
+  @Test(timeout = 1000)
+  public void finish() throws IOException {
+    test.finish();
+    verify(expr).finish();
+    verifyNoMoreInteractions(expr);
+  }
+
+  // test that the getUsage method is called
+  @Test(timeout = 1000)
+  public void getUsage() {
+    String[] usage = new String[] { "Usage 1", "Usage 2", "Usage 3" };
+    when(expr.getUsage()).thenReturn(usage);
+    assertArrayEquals(usage, test.getUsage());
+    verify(expr).getUsage();
+    verifyNoMoreInteractions(expr);
+  }
+
+  // test that the getHelp method is called
+  @Test(timeout = 1000)
+  public void getHelp() {
+    String[] help = new String[] { "Help 1", "Help 2", "Help 3" };
+    when(expr.getHelp()).thenReturn(help);
+    assertArrayEquals(help, test.getHelp());
+    verify(expr).getHelp();
+    verifyNoMoreInteractions(expr);
+  }
+
+  // test that the isAction method is called
+  @Test(timeout = 1000)
+  public void isAction() {
+    when(expr.isAction()).thenReturn(true).thenReturn(false);
+    assertTrue(test.isAction());
+    assertFalse(test.isAction());
+    verify(expr, times(2)).isAction();
+    verifyNoMoreInteractions(expr);
+  }
+
+  // test that the isOperator method is called
+  @Test(timeout = 1000)
+  public void isOperator() {
+    when(expr.isAction()).thenReturn(true).thenReturn(false);
+    assertTrue(test.isAction());
+    assertFalse(test.isAction());
+    verify(expr, times(2)).isAction();
+    verifyNoMoreInteractions(expr);
+  }
+
+  // test that the getPrecedence method is called
+  @Test(timeout = 1000)
+  public void getPrecedence() {
+    int precedence = 12345;
+    when(expr.getPrecedence()).thenReturn(precedence);
+    assertEquals(precedence, test.getPrecedence());
+    verify(expr).getPrecedence();
+    verifyNoMoreInteractions(expr);
+  }
+
+  // test that the addChildren method is called
+  @Test(timeout = 1000)
+  public void addChildren() {
+    @SuppressWarnings("unchecked")
+    Deque<Expression> expressions = mock(Deque.class);
+    test.addChildren(expressions);
+    verify(expr).addChildren(expressions);
+    verifyNoMoreInteractions(expr);
+  }
+
+  // test that the addArguments method is called
+  @Test(timeout = 1000)
+  public void addArguments() {
+    @SuppressWarnings("unchecked")
+    Deque<String> args = mock(Deque.class);
+    test.addArguments(args);
+    verify(expr).addArguments(args);
+    verifyNoMoreInteractions(expr);
+  }
+}


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