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From umag...@apache.org
Subject cvs commit: jakarta-ant/proposal/sandbox/filterreaders/src/main/org/apache/tools/ant/types FilterChain.java
Date Fri, 01 Mar 2002 00:56:33 GMT
umagesh     02/02/28 16:56:33

  Modified:    proposal/sandbox/filterreaders/src/main/org/apache/tools/ant/types
                        FilterChain.java
  Added:       proposal/sandbox/filterreaders/src/main/org/apache/tools/ant/filters
                        LineContainsRegExp.java
  Log:
  New filter reader that gets those lines that match a regular expression pattern.
  
  Requested by: Adam Murdoch
  
  Revision  Changes    Path
  1.1                  jakarta-ant/proposal/sandbox/filterreaders/src/main/org/apache/tools/ant/filters/LineContainsRegExp.java
  
  Index: LineContainsRegExp.java
  ===================================================================
  /*
   *  The Apache Software License, Version 1.1
   *
   *  Copyright (c) 2002 The Apache Software Foundation.  All rights
   *  reserved.
   *
   *  Redistribution and use in source and binary forms, with or without
   *  modification, are permitted provided that the following conditions
   *  are met:
   *
   *  1. Redistributions of source code must retain the above copyright
   *  notice, this list of conditions and the following disclaimer.
   *
   *  2. Redistributions in binary form must reproduce the above copyright
   *  notice, this list of conditions and the following disclaimer in
   *  the documentation and/or other materials provided with the
   *  distribution.
   *
   *  3. The end-user documentation included with the redistribution, if
   *  any, must include the following acknowlegement:
   *  "This product includes software developed by the
   *  Apache Software Foundation (http://www.apache.org/)."
   *  Alternately, this acknowlegement may appear in the software itself,
   *  if and wherever such third-party acknowlegements normally appear.
   *
   *  4. The names "The Jakarta Project", "Ant", and "Apache Software
   *  Foundation" must not be used to endorse or promote products derived
   *  from this software without prior written permission. For written
   *  permission, please contact apache@apache.org.
   *
   *  5. Products derived from this software may not be called "Apache"
   *  nor may "Apache" appear in their names without prior written
   *  permission of the Apache Group.
   *
   *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
   *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   *  OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
   *  DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
   *  ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
   *  SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
   *  LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
   *  USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
   *  ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
   *  OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
   *  OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   *  SUCH DAMAGE.
   *  ====================================================================
   *
   *  This software consists of voluntary contributions made by many
   *  individuals on behalf of the Apache Software Foundation.  For more
   *  information on the Apache Software Foundation, please see
   *  <http://www.apache.org/>.
   */
  package org.apache.tools.ant.filters;
  
  import java.io.IOException;
  import java.io.Reader;
  import java.util.Vector;
  
  import org.apache.tools.ant.types.Parameter;
  import org.apache.tools.ant.types.RegularExpression;
  import org.apache.tools.ant.util.regexp.Regexp;
  
  /**
   * Filter Reader to fetch only those lines that contain user specified
   * regular expression matching strings.
   *
   * Example:
   * =======
   *
   * &lt;linecontainsregexp&gt;
   *   &lt;regexp pattern=&quot;foo*&quot;&gt;
   * &lt;/linecontainsregexp&gt;
   *
   * Or:
   *
   * &lt;filterreader classname=&quot;org.apache.tools.ant.filters.LineContainsRegExp&quot;&gt;
   *    &lt;param type=&quot;regexp&quot; value=&quot;foo*&quot;/&gt;
   * &lt;/filterreader&gt;
   *
   * This will fetch all those lines that contain the pattern foo
   *
   * @author <a href="mailto:umagesh@apache.org">Magesh Umasankar</a>
   */
  public final class LineContainsRegExp
      extends BaseParamFilterReader
      implements ChainableReader
  {
      /** contains key */
      private static final String REGEXP_KEY = "regexp";
  
      /** Vector that holds the strings that input lines must contain. */
      private Vector regexps = new Vector();
  
      /** Currently read in line. */
      private String line = null;
  
      /**
       * This constructor is a dummy constructor and is
       * not meant to be used by any class other than Ant's
       * introspection mechanism. This will close the filter
       * that is created making it useless for further operations.
       */
      public LineContainsRegExp() {
          super();
      }
  
      /**
       * Create a new filtered reader.
       *
       * @param in  a Reader object providing the underlying stream.
       */
      public LineContainsRegExp(final Reader in) {
          super(in);
      }
  
      /**
       * Choose only those lines that contains
       * user defined values.
       */
      public final int read() throws IOException {
          if (!getInitialized()) {
              initialize();
              setInitialized(true);
          }
  
          int ch = -1;
  
          if (line != null) {
              ch = line.charAt(0);
              if (line.length() == 1) {
                  line = null;
              } else {
                  line = line.substring(1);
              }
          } else {
              line = readLine();
              if (line == null) {
                  ch = -1;
              } else {
                  final int regexpsSize = regexps.size();
                  for (int i = 0; i < regexpsSize; i++) {
                      RegularExpression regexp = (RegularExpression)
                                                          regexps.elementAt(i);
                      Regexp re = regexp.getRegexp(getProject());
                      boolean matches = re.matches(line);
                      if (!matches) {
                          line = null;
                          break;
                      }
                  }
  
                  return read();
              }
          }
  
          return ch;
      }
  
      /**
       * Add a contains element.
       */
      public final void addConfiguredRegexp(final RegularExpression regExp) {
          this.regexps.addElement(regExp);
      }
  
      /**
       * Set regexps vector.
       */
      private void setRegexps(final Vector regexps) {
          this.regexps = regexps;
      }
  
      /**
       * Get regexps vector.
       */
      private final Vector getRegexps() {
          return regexps;
      }
  
      /**
       * Create a new LineContainsRegExp using the passed in
       * Reader for instantiation.
       */
      public final Reader chain(final Reader rdr) {
          LineContainsRegExp newFilter = new LineContainsRegExp(rdr);
          newFilter.setRegexps(getRegexps());
          newFilter.setInitialized(true);
          return newFilter;
      }
  
      /**
       * Parse params to add user defined contains strings.
       */
      private final void initialize() {
          Parameter[] params = getParameters();
          if (params != null) {
              for (int i = 0; i < params.length; i++) {
                  if (REGEXP_KEY.equals(params[i].getType())) {
                      String pattern = params[i].getValue();
                      RegularExpression regexp = new RegularExpression();
                      regexp.setPattern(pattern);
                      regexps.addElement(regexp);
                  }
              }
          }
      }
  }
  
  
  
  1.3       +6 -0      jakarta-ant/proposal/sandbox/filterreaders/src/main/org/apache/tools/ant/types/FilterChain.java
  
  Index: FilterChain.java
  ===================================================================
  RCS file: /home/cvs/jakarta-ant/proposal/sandbox/filterreaders/src/main/org/apache/tools/ant/types/FilterChain.java,v
  retrieving revision 1.2
  retrieving revision 1.3
  diff -u -r1.2 -r1.3
  --- FilterChain.java	28 Feb 2002 21:59:04 -0000	1.2
  +++ FilterChain.java	1 Mar 2002 00:56:33 -0000	1.3
  @@ -58,6 +58,7 @@
   import org.apache.tools.ant.filters.ExpandProperties;
   import org.apache.tools.ant.filters.HeadFilter;
   import org.apache.tools.ant.filters.LineContains;
  +import org.apache.tools.ant.filters.LineContainsRegExp;
   import org.apache.tools.ant.filters.PrefixLines;
   import org.apache.tools.ant.filters.ReplaceTokens;
   import org.apache.tools.ant.filters.StripJavaComments;
  @@ -93,6 +94,11 @@
   
       public final void addLineContains(final LineContains lineContains) {
           filterReaders.addElement(lineContains);
  +    }
  +
  +    public final void addLineContainsRegExp(final LineContainsRegExp
  +                                                lineContainsRegExp) {
  +        filterReaders.addElement(lineContainsRegExp);
       }
   
       public final void addPrefixLines(final PrefixLines prefixLines) {
  
  
  

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