/*

 * Copyright (c) 2001, 2013, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.  Oracle designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Oracle in the LICENSE file that accompanied this code.

 *

 * This code 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 General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

package sun.net.www.http;

import java.io.*;

import java.net.*;

/**

 * Instances of this class are returned to applications for the purpose of

 * sending user data for a HTTP request (excluding TRACE). This class is used

 * when the content-length will be specified in the header of the request.

 * The semantics of ByteArrayOutputStream are extended so that

 * when close() is called, it is no longer possible to write

 * additional data to the stream. From this point the content length of

 * the request is fixed and cannot change.

 *

 * @author Michael McMahon

 */

public class PosterOutputStream extends ByteArrayOutputStream {

    private boolean closed;

    /**

     * Creates a new output stream for POST user data

     */

    public PosterOutputStream () {

        super (256);

    }

    /**

     * Writes the specified byte to this output stream.

     *

     * @param   b   the byte to be written.

     */

    public synchronized void write(int b) {

        if (closed) {

            return;

        }

        super.write (b);

    }

    /**

     * Writes <code>len</code> bytes from the specified byte array

     * starting at offset <code>off</code> to this output stream.

     *

     * @param   b     the data.

     * @param   off   the start offset in the data.

     * @param   len   the number of bytes to write.

     */

    public synchronized void write(byte b[], int off, int len) {

        if (closed) {

            return;

        }

        super.write (b, off, len);

    }

    /**

     * Resets the <code>count</code> field of this output

     * stream to zero, so that all currently accumulated output in the

     * output stream is discarded. The output stream can be used again,

     * reusing the already allocated buffer space. If the output stream

     * has been closed, then this method has no effect.

     *

     * @see     java.io.ByteArrayInputStream#count

     */

    public synchronized void reset() {

        if (closed) {

            return;

        }

        super.reset ();

    }

    /**

     * After close() has been called, it is no longer possible to write

     * to this stream. Further calls to write will have no effect.

     */

    public synchronized void close() throws IOException {

        closed = true;

        super.close ();

    }

}