/*
* JBoss, Home of Professional Open Source.
* See the COPYRIGHT.txt file distributed with this work for information
* regarding copyright ownership. Some portions may be licensed
* to Red Hat, Inc. under one or more contributor license agreements.
*
* This library 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 library 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 library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301 USA.
*/
package org.teiid.common.buffer.impl;
import java.io.IOException;
import java.io.OutputStream;
import java.nio.ByteBuffer;
public abstract class ExtensibleBufferedOutputStream extends OutputStream {
protected ByteBuffer buf;
protected int bytesWritten;
private int startPosition;
public ExtensibleBufferedOutputStream() {
}
public void write(int b) throws IOException {
ensureBuffer();
buf.put((byte)b);
}
public void write(byte b) throws IOException {
ensureBuffer();
buf.put(b);
}
private void ensureBuffer() throws IOException {
if (buf != null) {
if (buf.remaining() != 0) {
return;
}
flush();
}
buf = newBuffer();
startPosition = buf.position();
}
public void write(byte b[], int off, int len) throws IOException {
while (len > 0) {
ensureBuffer();
int toCopy = Math.min(buf.remaining(), len);
buf.put(b, off, toCopy);
len -= toCopy;
off += toCopy;
if (buf.remaining() > 0) {
break;
}
}
}
public void flush() throws IOException {
if (buf != null) {
int bytes = buf.position() - startPosition;
if (bytes > 0) {
bytesWritten += flushDirect(bytes);
}
}
buf = null;
}
protected abstract ByteBuffer newBuffer() throws IOException;
/**
* Flush up to i bytes where i is the current position of the buffer
*/
protected abstract int flushDirect(int i) throws IOException;
@Override
public void close() throws IOException {
flush();
}
public int getBytesWritten() {
return bytesWritten;
}
}