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Subject: svn commit: r619141 - in /commons/proper/io/trunk/src:
 java/org/apache/commons/io/output/StringBuilderWriter.java
 test/org/apache/commons/io/output/StringBuilderWriterTest.java
Date: Wed, 06 Feb 2008 20:16:56 -0000
To: commits@commons.apache.org
From: niallp@apache.org
Message-Id: <20080206201656.748FB1A9832@eris.apache.org>

Author: niallp
Date: Wed Feb  6 12:16:55 2008
New Revision: 619141

URL: http://svn.apache.org/viewvc?rev=619141&view=rev
Log:
IO-139 Add StringBuilder Writer implementation

Added:
    commons/proper/io/trunk/src/java/org/apache/commons/io/output/StringBuilderWriter.java   (with props)
    commons/proper/io/trunk/src/test/org/apache/commons/io/output/StringBuilderWriterTest.java   (with props)

Added: commons/proper/io/trunk/src/java/org/apache/commons/io/output/StringBuilderWriter.java
URL: http://svn.apache.org/viewvc/commons/proper/io/trunk/src/java/org/apache/commons/io/output/StringBuilderWriter.java?rev=619141&view=auto
==============================================================================
--- commons/proper/io/trunk/src/java/org/apache/commons/io/output/StringBuilderWriter.java (added)
+++ commons/proper/io/trunk/src/java/org/apache/commons/io/output/StringBuilderWriter.java Wed Feb  6 12:16:55 2008
@@ -0,0 +1,152 @@
+/*
+ * 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.commons.io.output;
+
+import java.io.Serializable;
+import java.io.Writer;
+
+/**
+ * {@link Writer} implementation that outputs to a {@link StringBuilder}.
+ * <p>
+ * <strong>NOTE:</strong> This implementation, as an alternative to
+ * <code>java.io.StringWriter</code>, provides an <i>un-synchronized</i>
+ * (i.e. for use in a single thread) implementation for better performance.
+ * For safe usage with multiple {@link Thread}s then
+ * <code>java.io.StringWriter</code> should be used.
+ *
+ * @version $Revision$ $Date$
+ * @since IO 2.0
+ */
+public class StringBuilderWriter extends Writer implements Serializable {
+
+    private final StringBuilder builder;
+
+    /**
+     * Construct a new {@link StringBuilder} instance with default capacity.
+     */
+    public StringBuilderWriter() {
+        this.builder = new StringBuilder();
+    }
+
+    /**
+     * Construct a new {@link StringBuilder} instance with the specified capacity.
+     *
+     * @param capacity The initial capacity of the underlying {@link StringBuilder}
+     */
+    public StringBuilderWriter(int capacity) {
+        this.builder = new StringBuilder(capacity);
+    }
+
+    /**
+     * Construct a new instance with the specified {@link StringBuilder}.
+     *
+     * @param builder The String builder
+     */
+    public StringBuilderWriter(StringBuilder builder) {
+        this.builder = (builder != null ? builder : new StringBuilder());
+    }
+
+    /**
+     * Append a single character to this Writer.
+     *
+     * @param value The character to append
+     * @return This writer instance
+     */
+    public Writer append(char value) {
+        builder.append(value);
+        return this;
+    }
+
+    /**
+     * Append a character sequence to this Writer.
+     *
+     * @param value The character to append
+     * @return This writer instance
+     */
+    public Writer append(CharSequence value) {
+        builder.append(value);
+        return this;
+    }
+
+    /**
+     * Append a portion of a character sequence to the {@link StringBuilder}.
+     *
+     * @param value The character to append
+     * @param start The index of the first character
+     * @param end The index of the last character + 1
+     * @return This writer instance
+     */
+    public Writer append(CharSequence value, int start, int end) {
+        builder.append(value, start, end);
+        return this;
+    }
+
+    /**
+     * Closing this writer has no effect. 
+     */
+    public void close() {
+    }
+
+    /**
+     * Flushing this writer has no effect. 
+     */
+    public void flush() {
+    }
+
+
+    /**
+     * Write a String to the {@link StringBuilder}.
+     * 
+     * @param value The value to write
+     */
+    public void write(String value) {
+        if (value != null) {
+            builder.append(value);
+        }
+    }
+
+    /**
+     * Write a portion of a character array to the {@link StringBuilder}.
+     *
+     * @param value The value to write
+     * @param offset The index of the first character
+     * @param length The number of characters to write
+     */
+    public void write(char[] value, int offset, int length) {
+        if (value != null) {
+            builder.append(value, offset, length);
+        }
+    }
+
+    /**
+     * Return the underlying builder.
+     *
+     * @return The underlying builder
+     */
+    public StringBuilder getBuilder() {
+        return builder;
+    }
+
+    /**
+     * Returns {@link StringBuilder#toString()}.
+     *
+     * @return The contents of the String builder.
+     */
+    public String toString() {
+        return builder.toString();
+    }
+}

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Added: commons/proper/io/trunk/src/test/org/apache/commons/io/output/StringBuilderWriterTest.java
URL: http://svn.apache.org/viewvc/commons/proper/io/trunk/src/test/org/apache/commons/io/output/StringBuilderWriterTest.java?rev=619141&view=auto
==============================================================================
--- commons/proper/io/trunk/src/test/org/apache/commons/io/output/StringBuilderWriterTest.java (added)
+++ commons/proper/io/trunk/src/test/org/apache/commons/io/output/StringBuilderWriterTest.java Wed Feb  6 12:16:55 2008
@@ -0,0 +1,143 @@
+/*
+ * 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.commons.io.output;
+
+import java.io.IOException;
+import java.io.Writer;
+import junit.framework.TestCase;
+
+/**
+ * Test case for {@link StringBuilderWriter}.
+ *
+ * @version $Revision$ $Date$
+ */
+public class StringBuilderWriterTest extends TestCase {
+    private static final char[] FOOBAR_CHARS = new char[] {'F', 'o', 'o', 'B', 'a', 'r'};
+
+    /**
+     * Contruct a new test case.
+     * @param name The name of the test
+     */
+    public StringBuilderWriterTest(String name) {
+        super(name);
+    }
+
+    /** Test {@link StringBuilderWriter} constructor. */
+    public void testAppendConstructCapacity() throws IOException {
+        Writer writer = new StringBuilderWriter(100);
+        writer.append("Foo");
+        assertEquals("Foo", writer.toString());
+    }
+
+    /** Test {@link StringBuilderWriter} constructor. */
+    public void testAppendConstructStringBuilder() throws IOException {
+        StringBuilder builder = new StringBuilder("Foo");
+        StringBuilderWriter writer = new StringBuilderWriter(builder);
+        writer.append("Bar");
+        assertEquals("FooBar", writer.toString());
+        assertTrue(builder == writer.getBuilder());
+    }
+
+    /** Test {@link StringBuilderWriter} constructor. */
+    public void testAppendConstructNull() throws IOException {
+        Writer writer = new StringBuilderWriter((StringBuilder)null);
+        writer.append("Foo");
+        assertEquals("Foo", writer.toString());
+    }
+
+    /** Test {@link Writer#append(char)}. */
+    public void testAppendChar() throws IOException {
+        Writer writer = new StringBuilderWriter();
+        writer.append('F').append('o').append('o');
+        assertEquals("Foo", writer.toString());
+    }
+
+    /** Test {@link Writer#append(CharSequence)}. */
+    public void testAppendCharSequence() throws IOException {
+        Writer writer = new StringBuilderWriter();
+        writer.append("Foo").append("Bar");
+        assertEquals("FooBar", writer.toString());
+    }
+
+    /** Test {@link Writer#append(CharSequence, int, int)}. */
+    public void testAppendCharSequencePortion() throws IOException {
+        Writer writer = new StringBuilderWriter();
+        writer.append("FooBar", 3, 6).append(new StringBuffer("FooBar"), 0, 3);
+        assertEquals("BarFoo", writer.toString());
+    }
+
+    /** Test {@link Writer#close()}. */
+    public void testClose() {
+        Writer writer = new StringBuilderWriter();
+        try {
+            writer.append("Foo");
+            writer.close();
+            writer.append("Bar");
+        } catch (Throwable t) {
+            fail("Threw: " + t);
+        }
+        assertEquals("FooBar", writer.toString());
+    }
+
+    /** Test {@link Writer#write(int)}. */
+    public void testWriteChar() throws IOException {
+        Writer writer = new StringBuilderWriter();
+        writer.write('F');
+        assertEquals("F", writer.toString());
+        writer.write('o');
+        assertEquals("Fo", writer.toString());
+        writer.write('o');
+        assertEquals("Foo", writer.toString());
+    }
+
+    /** Test {@link Writer#write(char[])}. */
+    public void testWriteCharArray() throws IOException {
+        Writer writer = new StringBuilderWriter();
+        writer.write(new char[] {'F', 'o', 'o'});
+        assertEquals("Foo", writer.toString());
+        writer.write(new char[] {'B', 'a', 'r'});
+        assertEquals("FooBar", writer.toString());
+    }
+
+    /** Test {@link Writer#write(char[], int, int)}. */
+    public void testWriteCharArrayPortion() throws IOException {
+        Writer writer = new StringBuilderWriter();
+        writer.write(FOOBAR_CHARS, 3, 3);
+        assertEquals("Bar", writer.toString());
+        writer.write(FOOBAR_CHARS, 0, 3);
+        assertEquals("BarFoo", writer.toString());
+    }
+
+    /** Test {@link Writer#write(String)}. */
+    public void testWriteString() throws IOException {
+        Writer writer = new StringBuilderWriter();
+        writer.write("Foo");
+        assertEquals("Foo", writer.toString());
+        writer.write("Bar");
+        assertEquals("FooBar", writer.toString());
+    }
+
+    /** Test {@link Writer#write(String, int, int)}. */
+    public void testWriteStringPortion() throws IOException {
+        Writer writer = new StringBuilderWriter();
+        writer.write("FooBar", 3, 3);
+        assertEquals("Bar", writer.toString());
+        writer.write("FooBar", 0, 3);
+        assertEquals("BarFoo", writer.toString());
+    }
+
+}

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