/**
* Copyright (C) 2009 eXo Platform SAS.
*
* This is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This software 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this software; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA, or see the FSF site: http://www.fsf.org.
*/
package org.exoplatform.commons.utils;
import java.io.IOException;
import java.io.OutputStream;
/**
* A stream that maintains a buffer and flush it on a delegate output stream when it is filled. Unlike
* {@link java.io.BufferedOutputStream} this class is not synchronized.
*
* @author <a href="mailto:julien.viet@exoplatform.com">Julien Viet</a>
* @version $Revision$
*/
public class BufferingOutputStream extends OutputStream {
/** . */
private final OutputStream out;
/** . */
private byte[] buffer;
/** . */
private boolean open;
/** . */
private int offset;
/** . */
private final int size;
public BufferingOutputStream(OutputStream out, int bufferSize) {
if (out == null) {
throw new NullPointerException("No null output stream");
}
if (bufferSize < 1) {
throw new IllegalArgumentException("No buffer size under 1");
}
this.out = out;
this.buffer = new byte[bufferSize];
this.size = bufferSize;
this.open = true;
}
@Override
public void write(int b) throws IOException {
if (!open) {
throw new IOException("closed");
}
if (offset >= size) {
out.write(buffer);
offset = 0;
}
buffer[offset++] = (byte) b;
}
@Override
public void write(byte[] b, int off, int len) throws IOException {
if (!open) {
throw new IOException("closed");
}
//
if (offset + len >= size) {
// Clear the buffer
out.write(buffer, 0, offset);
offset = 0;
// While the data length is greater than the the buffer size
// write directly to the wire
while (len >= size) {
out.write(b, off, size);
off += size;
len -= size;
}
}
//
System.arraycopy(b, off, buffer, offset, len);
offset += len;
}
@Override
public void flush() throws IOException {
if (!open) {
throw new IOException("closed");
}
//
if (offset > 0) {
out.write(buffer, 0, offset);
offset = 0;
}
//
out.flush();
}
@Override
public void close() throws IOException {
if (!open) {
throw new IOException("closed");
}
//
if (offset > 0) {
out.write(buffer, 0, offset);
offset = 0;
}
//
open = false;
out.close();
}
}