190 lines
6.2 KiB
Java
190 lines
6.2 KiB
Java
/* StringWriter.java -- Writes bytes to a StringBuffer
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Copyright (C) 1998, 1999, 2000, 2001 Free Software Foundation, Inc.
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This file is part of GNU Classpath.
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GNU Classpath is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU Classpath is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Classpath; see the file COPYING. If not, write to the
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Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA.
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Linking this library statically or dynamically with other modules is
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making a combined work based on this library. Thus, the terms and
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conditions of the GNU General Public License cover the whole
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combination.
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As a special exception, the copyright holders of this library give you
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permission to link this library with independent modules to produce an
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executable, regardless of the license terms of these independent
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modules, and to copy and distribute the resulting executable under
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terms of your choice, provided that you also meet, for each linked
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independent module, the terms and conditions of the license of that
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module. An independent module is a module which is not derived from
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or based on this library. If you modify this library, you may extend
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this exception to your version of the library, but you are not
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obligated to do so. If you do not wish to do so, delete this
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exception statement from your version. */
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package java.io;
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// Wow is this a dumb class. CharArrayWriter can do all this and
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// more. I would redirect all calls to one in fact, but the javadocs say
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// use a StringBuffer so I will comply.
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/**
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* This class writes chars to an internal <code>StringBuffer</code> that
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* can then be used to retrieve a <code>String</code>.
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*
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* @author Aaron M. Renn (arenn@urbanophile.com)
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* @author Tom Tromey <tromey@cygnus.com>
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*/
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public class StringWriter extends Writer
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{
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/**
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* This is the default size of the buffer if the user doesn't specify it.
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* @specnote The JCL Volume 1 says that 16 is the default size.
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*/
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private static final int DEFAULT_BUFFER_SIZE = 16;
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/**
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* This method closes the stream. The contents of the internal buffer
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* can still be retrieved, but future writes are not guaranteed to work.
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*/
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public void close ()
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{
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// JCL says this does nothing. This seems to violate the Writer
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// contract, in that other methods should still throw an
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// IOException after a close. Still, we just follow JCL.
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}
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/**
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* This method flushes any buffered characters to the underlying output.
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* It does nothing in this class.
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*/
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public void flush ()
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{
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}
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/**
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* This method returns the <code>StringBuffer</code> object that this
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* object is writing to. Note that this is the actual internal buffer, so
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* any operations performed on it will affect this stream object.
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*
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* @return The <code>StringBuffer</code> object being written to
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*/
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public StringBuffer getBuffer ()
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{
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return buffer;
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}
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/**
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* This method initializes a new <code>StringWriter</code> to write to a
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* <code>StringBuffer</code> initially sized to a default size of 16
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* chars.
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*/
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public StringWriter ()
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{
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this (DEFAULT_BUFFER_SIZE);
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}
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/**
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* This method initializes a new <code>StringWriter</code> to write to a
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* <code>StringBuffer</code> with the specified initial size.
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*
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* @param size The initial size to make the <code>StringBuffer</code>
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*/
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public StringWriter (int size)
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{
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super ();
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buffer = new StringBuffer (size);
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lock = buffer;
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}
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/**
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* This method returns the contents of the internal <code>StringBuffer</code>
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* as a <code>String</code>.
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*
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* @return A <code>String</code> representing the chars written to
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* this stream.
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*/
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public String toString ()
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{
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return buffer.toString();
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}
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/**
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* This method writes a single character to the output, storing it in
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* the internal buffer.
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*
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* @param oneChar The <code>char</code> to write, passed as an int.
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*/
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public void write (int oneChar)
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{
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buffer.append((char) (oneChar & 0xFFFF));
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}
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/**
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* This method writes <code>len</code> chars from the specified
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* array starting at index <code>offset</code> in that array to this
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* stream by appending the chars to the end of the internal buffer.
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*
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* @param chars The array of chars to write
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* @param offset The index into the array to start writing from
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* @param len The number of chars to write
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*/
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public void write (char[] chars, int offset, int len)
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{
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buffer.append(chars, offset, len);
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}
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/**
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* This method writes the characters in the specified <code>String</code>
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* to the stream by appending them to the end of the internal buffer.
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*
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* @param str The <code>String</code> to write to the stream.
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*/
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public void write (String str)
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{
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buffer.append(str);
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}
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/**
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* This method writes out <code>len</code> characters of the specified
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* <code>String</code> to the stream starting at character position
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* <code>offset</code> into the stream. This is done by appending the
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* characters to the internal buffer.
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*
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* @param str The <code>String</code> to write characters from
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* @param offset The character position to start writing from
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* @param len The number of characters to write.
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*/
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public void write (String str, int offset, int len)
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{
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// char[] tmpbuf = new char[len];
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// str.getChars(offset, offset+len, tmpbuf, 0);
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// buf.append(tmpbuf, 0, tmpbuf.length);
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// This implementation assumes that String.substring is more
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// efficient than using String.getChars and copying the data
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// twice. For libgcj, this is true. For Classpath, it is not.
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// FIXME.
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buffer.append(str.substring(offset, offset + len));
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}
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/**
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* This is the <code>StringBuffer</code> that we use to store bytes that
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* are written.
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*/
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private StringBuffer buffer;
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}
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