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/*
* $HeadURL: http://svn.apache.org/repos/asf/httpcomponents/httpcore/trunk/module-main/src/main/java/org/apache/http/impl/io/ContentLengthOutputStream.java $
* $Revision: 560343 $
* $Date: 2007-07-27 11:18:19 -0700 (Fri, 27 Jul 2007) $
*
* ====================================================================
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation. For more
* information on the Apache Software Foundation, please see
* <http://www.apache.org/>.
*
*/
package org.apache.http.impl.io;
import java.io.IOException;
import java.io.OutputStream;
import org.apache.http.io.SessionOutputBuffer;
/**
* A stream wrapper that closes itself after a defined number of bytes.
*
* @author <a href="mailto:oleg at ural.ru">Oleg Kalnichevski</a>
*
* @version $Revision: 560343 $
*
* @since 4.0
*/
public class ContentLengthOutputStream extends OutputStream {
/**
* Wrapped session outbut buffer.
*/
private final SessionOutputBuffer out;
/**
* The maximum number of bytes that can be written the stream. Subsequent
* write operations will be ignored.
*/
private final long contentLength;
/** Total bytes written */
private long total = 0;
/** True if the stream is closed. */
private boolean closed = false;
/**
* Creates a new length limited stream
*
* @param out The data transmitter to wrap
* @param contentLength The maximum number of bytes that can be written to
* the stream. Subsequent write operations will be ignored.
*
* @since 4.0
*/
public ContentLengthOutputStream(final SessionOutputBuffer out, long contentLength) {
super();
if (out == null) {
throw new IllegalArgumentException("Session output buffer may not be null");
}
if (contentLength < 0) {
throw new IllegalArgumentException("Content length may not be negative");
}
this.out = out;
this.contentLength = contentLength;
}
/**
* <p>Does not close the underlying socket output.</p>
*
* @throws IOException If an I/O problem occurs.
*/
public void close() throws IOException {
if (!this.closed) {
this.closed = true;
this.out.flush();
}
}
public void flush() throws IOException {
this.out.flush();
}
public void write(byte[] b, int off, int len) throws IOException {
if (this.closed) {
throw new IOException("Attempted write to closed stream.");
}
if (this.total < this.contentLength) {
long max = this.contentLength - this.total;
if (len > max) {
len = (int) max;
}
this.out.write(b, off, len);
this.total += len;
}
}
public void write(byte[] b) throws IOException {
write(b, 0, b.length);
}
public void write(int b) throws IOException {
if (this.closed) {
throw new IOException("Attempted write to closed stream.");
}
if (this.total < this.contentLength) {
this.out.write(b);
this.total++;
}
}
}
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