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/*
 * ====================================================================
 * 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
 * .
 *
 */

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.
 * 

* 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"); } /** *

Does not close the underlying socket output.

* * @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); } }




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