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