/*
* ====================================================================
* 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;
import org.apache.http.util.
Args;
/**
* Output stream that writes data without any transformation. The end of
* the content entity is demarcated by closing the underlying connection
* (EOF condition). Entities transferred using this input stream can be of
* unlimited length.
* <p>
* Note that this class NEVER closes the underlying stream, even when close
* gets called. Instead, the stream will be marked as closed and no further
* output will be permitted.
*
* @since 4.0
*/
public class
IdentityOutputStream extends
OutputStream {
/**
* Wrapped session output buffer.
*/
private final
SessionOutputBuffer out;
/** True if the stream is closed. */
private boolean
closed = false;
public
IdentityOutputStream(final
SessionOutputBuffer out) {
super();
this.
out =
Args.
notNull(
out, "Session output buffer");
}
/**
* <p>Does not close the underlying socket output.</p>
*
* @throws IOException If an I/O problem occurs.
*/
@
Override
public void
close() throws
IOException {
if (!this.
closed) {
this.
closed = true;
this.
out.
flush();
}
}
@
Override
public void
flush() throws
IOException {
this.
out.
flush();
}
@
Override
public void
write(final byte[]
b, final int
off, final int
len) throws
IOException {
if (this.
closed) {
throw new
IOException("Attempted write to closed stream.");
}
this.
out.
write(
b,
off,
len);
}
@
Override
public void
write(final byte[]
b) throws
IOException {
write(
b, 0,
b.length);
}
@
Override
public void
write(final int
b) throws
IOException {
if (this.
closed) {
throw new
IOException("Attempted write to closed stream.");
}
this.
out.
write(
b);
}
}