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1 files changed, 352 insertions, 0 deletions

diff --git a/libjava/classpath/java/io/CharArrayWriter.java b/libjava/classpath/java/io/CharArrayWriter.java
new file mode 100644
index 000000000..dea727aa1
--- /dev/null
+++ b/libjava/classpath/java/io/CharArrayWriter.java
@@ -0,0 +1,352 @@
+/* CharArrayWriter.java -- Write chars to a buffer
+   Copyright (C) 1998, 1999, 2001, 2002, 2005  Free Software Foundation, Inc.
+
+This file is part of GNU Classpath.
+
+GNU Classpath is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2, or (at your option)
+any later version.
+
+GNU Classpath is distributed in the hope that it will be useful, but
+WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GNU Classpath; see the file COPYING.  If not, write to the
+Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+02110-1301 USA.
+
+Linking this library statically or dynamically with other modules is
+making a combined work based on this library.  Thus, the terms and
+conditions of the GNU General Public License cover the whole
+combination.
+
+As a special exception, the copyright holders of this library give you
+permission to link this library with independent modules to produce an
+executable, regardless of the license terms of these independent
+modules, and to copy and distribute the resulting executable under
+terms of your choice, provided that you also meet, for each linked
+independent module, the terms and conditions of the license of that
+module.  An independent module is a module which is not derived from
+or based on this library.  If you modify this library, you may extend
+this exception to your version of the library, but you are not
+obligated to do so.  If you do not wish to do so, delete this
+exception statement from your version. */
+
+
+package java.io;
+
+/**
+  * This class allows data to be written to a char array buffer and
+  * and then retrieved by an application.   The internal char array
+  * buffer is dynamically resized to hold all the data written.  Please
+  * be aware that writing large amounts to data to this stream will
+  * cause large amounts of memory to be allocated.
+  * <p>
+  * The size of the internal buffer defaults to 32 and it is resized
+  * in increments of 1024 chars.  This behavior can be over-ridden by using the
+  * following two properties:
+  * <p>
+  * <ul>
+  * <li><xmp>gnu.java.io.CharArrayWriter.initialBufferSize</xmp></li>
+  * <li><xmp>gnu.java.io.CharArrayWriter.bufferIncrementSize</xmp></li>
+  * </ul>
+  * <p>
+  * There is a constructor that specified the initial buffer size and
+  * that is the preferred way to set that value because it it portable
+  * across all Java class library implementations.
+  * <p>
+  *
+  * @author Aaron M. Renn (arenn@urbanophile.com)
+  * @author Tom Tromey (tromey@cygnus.com)
+  */
+public class CharArrayWriter extends Writer
+{
+  /**
+   * The default initial buffer size
+   */
+  private static final int DEFAULT_INITIAL_BUFFER_SIZE = 32;
+
+  /**
+   * This method initializes a new <code>CharArrayWriter</code> with
+   * the default buffer size of 32 chars.  If a different initial
+   * buffer size is desired, see the constructor
+   * <code>CharArrayWriter(int size)</code>.
+   */
+  public CharArrayWriter ()
+  {
+    this (DEFAULT_INITIAL_BUFFER_SIZE);
+  }
+
+  /**
+   * This method initializes a new <code>CharArrayWriter</code> with
+   * a specified initial buffer size.
+   *
+   * @param size The initial buffer size in chars
+   */
+  public CharArrayWriter (int size)
+  {
+    super ();
+    buf = new char[size];
+  }
+
+  /**
+   * Closes the stream.  This method is guaranteed not to free the contents
+   * of the internal buffer, which can still be retrieved.
+   */
+  public void close ()
+  {
+  }
+
+  /**
+   * This method flushes all buffered chars to the stream.
+   */
+  public void flush ()
+  {
+  }
+
+  /**
+   * This method discards all of the chars that have been written to the
+   * internal buffer so far by setting the <code>count</code> variable to
+   * 0.  The internal buffer remains at its currently allocated size.
+   */
+  public void reset ()
+  {
+    synchronized (lock)
+      {
+        count = 0;
+      }
+  }
+
+  /**
+   * This method returns the number of chars that have been written to
+   * the buffer so far.  This is the same as the value of the protected
+   * <code>count</code> variable.  If the <code>reset</code> method is
+   * called, then this value is reset as well.  Note that this method does
+   * not return the length of the internal buffer, but only the number
+   * of chars that have been written to it.
+   *
+   * @return The number of chars in the internal buffer
+   *
+   * @see #reset()
+   */
+  public int size ()
+  {
+    return count;
+  }
+
+  /**
+   * This method returns a char array containing the chars that have been
+   * written to this stream so far.  This array is a copy of the valid
+   * chars in the internal buffer and its length is equal to the number of
+   * valid chars, not necessarily to the the length of the current
+   * internal buffer.  Note that since this method allocates a new array,
+   * it should be used with caution when the internal buffer is very large.
+   */
+  public char[] toCharArray ()
+  {
+    synchronized (lock)
+      {
+        char[] nc = new char[count];
+        System.arraycopy(buf, 0, nc, 0, count);
+        return nc;
+      }
+  }
+
+  /**
+   * Returns the chars in the internal array as a <code>String</code>.  The
+   * chars in the buffer are converted to characters using the system default
+   * encoding.  There is an overloaded <code>toString()</code> method that
+   * allows an application specified character encoding to be used.
+   *
+   * @return A <code>String</code> containing the data written to this
+   *         stream so far
+   */
+  public String toString ()
+  {
+    synchronized (lock)
+      {
+        return new String (buf, 0, count);
+      }
+  }
+
+  /**
+   * This method writes the writes the specified char into the internal
+   * buffer.
+   *
+   * @param oneChar The char to be read passed as an int
+   */
+  public void write (int oneChar)
+  {
+    synchronized (lock)
+      {
+        resize (1);
+        buf[count++] = (char) oneChar;
+      }
+  }
+
+  /**
+   * This method writes <code>len</code> chars from the passed in array
+   * <code>buf</code> starting at index <code>offset</code> into that buffer
+   *
+   * @param buffer The char array to write data from
+   * @param offset The index into the buffer to start writing data from
+   * @param len The number of chars to write
+   */
+  public void write (char[] buffer, int offset, int len)
+  {
+    synchronized (lock)
+      {
+        if (len >= 0)
+          resize (len);
+        System.arraycopy(buffer, offset, buf, count, len);
+        count += len;
+      }
+  }
+
+  /**
+   * This method writes <code>len</code> chars from the passed in
+   * <code>String</code> <code>buf</code> starting at index
+   * <code>offset</code> into the internal buffer.
+   *
+   * @param str The <code>String</code> to write data from
+   * @param offset The index into the string to start writing data from
+   * @param len The number of chars to write
+   */
+  public void write (String str, int offset, int len)
+  {
+    synchronized (lock)
+      {
+        if (len >= 0)
+          resize (len);
+        str.getChars(offset, offset + len, buf, count);
+        count += len;
+      }
+  }
+
+  /**
+   * This method writes all the chars that have been written to this stream
+   * from the internal buffer to the specified <code>Writer</code>.
+   *
+   * @param out The <code>Writer</code> to write to
+   *
+   * @exception IOException If an error occurs
+   */
+  public void writeTo (Writer out) throws IOException
+  {
+    synchronized (lock)
+      {
+        out.write(buf, 0, count);
+      }
+  }
+
+  /**
+   * Appends the Unicode character, <code>c</code>, to the output stream
+   * underlying this writer.  This is equivalent to <code>write(c)</code>.
+   *
+   * @param c the character to append.
+   * @return a reference to this object.
+   * @since 1.5
+   */
+  public CharArrayWriter append(char c)
+  {
+    write(c);
+    return this;
+  }
+
+  /**
+   * Appends the specified sequence of Unicode characters to the
+   * output stream underlying this writer.  This is equivalent to
+   * appending the results of calling <code>toString()</code> on the
+   * character sequence.  As a result, the entire sequence may not be
+   * appended, as it depends on the implementation of
+   * <code>toString()</code> provided by the
+   * <code>CharSequence</code>.  For example, if the character
+   * sequence is wrapped around an input buffer, the results will
+   * depend on the current position and length of that buffer.
+   *
+   * @param cs the character sequence to append.  If seq is null,
+   *        then the string "null" (the string representation of null)
+   *        is appended.
+   * @return a reference to this object.
+   * @since 1.5
+   */
+  public CharArrayWriter append(CharSequence cs)
+  {
+    try
+      {
+        write(cs == null ? "null" : cs.toString());
+      }
+    catch (IOException _)
+      {
+        // Can't happen.
+      }
+    return this;
+  }
+
+  /**
+   * Appends the specified subsequence of Unicode characters to the
+   * output stream underlying this writer, starting and ending at the
+   * specified positions within the sequence.  The behaviour of this
+   * method matches the behaviour of writing the result of
+   * <code>append(seq.subSequence(start,end))</code> when the sequence
+   * is not null.
+   *
+   * @param cs the character sequence to append.  If seq is null,
+   *        then the string "null" (the string representation of null)
+   *        is appended.
+   * @param start the index of the first Unicode character to use from
+   *        the sequence.
+   * @param end the index of the last Unicode character to use from the
+   *        sequence.
+   * @return a reference to this object.
+   * @throws IndexOutOfBoundsException if either of the indices are negative,
+   *         the start index occurs after the end index, or the end index is
+   *         beyond the end of the sequence.
+   * @since 1.5
+   */
+  public CharArrayWriter append(CharSequence cs, int start, int end)
+  {
+    try
+      {
+        write(cs == null ? "null" : cs.subSequence(start, end).toString());
+      }
+    catch (IOException _)
+      {
+        // Can't happen.
+      }
+    return this;
+  }
+
+  /**
+   * This private method makes the buffer bigger when we run out of room
+   * by allocating a larger buffer and copying the valid chars from the
+   * old array into it.  This is obviously slow and should be avoided by
+   * application programmers by setting their initial buffer size big
+   * enough to hold everything if possible.
+   */
+  private void resize (int len)
+  {
+    if (count + len >= buf.length)
+      {
+        int newlen = buf.length * 2;
+        if (count + len > newlen)
+          newlen = count + len;
+        char[] newbuf = new char[newlen];
+        System.arraycopy(buf, 0, newbuf, 0, count);
+        buf = newbuf;
+      }
+  }
+
+  /**
+   * The internal buffer where the data written is stored
+   */
+  protected char[] buf;
+
+  /**
+   * The number of chars that have been written to the buffer
+   */
+  protected int count;
+}