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// BufferedWriter.java - Filtered character output stream.
/* Copyright (C) 1998, 1999 Cygnus Solutions
This file is part of libgcj.
This software is copyrighted work licensed under the terms of the
Libgcj License. Please consult the file "LIBGCJ_LICENSE" for
details. */
package java.io;
/**
* @author Tom Tromey <tromey@cygnus.com>
* @date September 25, 1998
*/
/* Written using "Java Class Libraries", 2nd edition, ISBN 0-201-31002-3
* "The Java Language Specification", ISBN 0-201-63451-1
* Status: Complete to version 1.1.
*/
// Why not extend FilterWriter?
public class BufferedWriter extends Writer
{
public BufferedWriter (Writer out)
{
this (out, 8192);
}
public BufferedWriter (Writer ox, int size)
{
super (ox);
out = ox;
buffer = new char[size];
count = 0;
}
public void close () throws IOException
{
localFlush ();
out.close();
}
public void flush () throws IOException
{
localFlush ();
out.flush();
}
public void newLine () throws IOException
{
write (System.getProperty("line.separator"));
}
public void write (int oneChar) throws IOException
{
synchronized (lock)
{
buffer[count++] = (char) oneChar;
if (count == buffer.length)
localFlush ();
}
}
public void write (char[] buf, int offset, int len) throws IOException
{
if (offset < 0 || len < 0 || offset + len > buf.length)
throw new ArrayIndexOutOfBoundsException ();
synchronized (lock)
{
// Bypass buffering if there is too much incoming data.
if (count + len > buffer.length)
{
localFlush ();
out.write(buf, offset, len);
}
else
{
System.arraycopy(buf, offset, buffer, count, len);
count += len;
if (count == buffer.length)
localFlush ();
}
}
}
public void write (String str, int offset, int len) throws IOException
{
if (offset < 0 || len < 0 || offset + len < str.length())
throw new ArrayIndexOutOfBoundsException ();
synchronized (lock)
{
if (count + len > buffer.length)
{
localFlush ();
out.write(str, offset, len);
}
else
{
str.getChars(offset, offset + len, buffer, count);
count += len;
if (count == buffer.length)
localFlush ();
}
}
}
private final void localFlush () throws IOException
{
if (count > 0)
{
synchronized (lock)
{
out.write(buffer, 0, count);
count = 0;
}
}
}
// The downstream writer.
private Writer out;
// The character buffer.
char[] buffer;
// Number of valid chars in buffer.
int count;
}
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