1 /*

     2  * Copyright (c) 1996, Oracle and/or its affiliates. All rights reserved.

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

     4  *

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

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

     7  * published by the Free Software Foundation.  Oracle designates this

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

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

    10  *

    11  * This code is distributed in the hope that it will be useful, but WITHOUT

    12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

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

    15  * accompanied this code).

    16  *

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

    18  * 2 along with this work; if not, write to the Free Software Foundation,

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

    20  *

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

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

    23  * questions.

    24  */

    25 package sun.rmi.transport.proxy;

    26 

    27 import java.io.*;

    28 

    29 /**

    30  * The HttpSendOutputStream class is used by the HttpSendSocket class as

    31  * a layer on the top of the OutputStream it returns so that it can be

    32  * notified of attempts to write to it.  This allows the HttpSendSocket

    33  * to know when it should construct a new message.

    34  */

    35 class HttpSendOutputStream extends FilterOutputStream {

    36 

    37     /** the HttpSendSocket object that is providing this stream */

    38     HttpSendSocket owner;

    39 

    40     /**

    41      * Create new filter on a given output stream.

    42      * @param out the OutputStream to filter from

    43      * @param owner the HttpSendSocket that is providing this stream

    44      */

    45     public HttpSendOutputStream(OutputStream out, HttpSendSocket owner)

    46         throws IOException

    47     {

    48         super(out);

    49 

    50         this.owner = owner;

    51     }

    52 

    53     /**

    54      * Mark this stream as inactive for its owner socket, so the next time

    55      * a write is attempted, the owner will be notified and a new underlying

    56      * output stream obtained.

    57      */

    58     public void deactivate()

    59     {

    60         out = null;

    61     }

    62 

    63     /**

    64      * Write a byte of data to the stream.

    65      */

    66     public void write(int b) throws IOException

    67     {

    68         if (out == null)

    69             out = owner.writeNotify();

    70         out.write(b);

    71     }

    72 

    73     /**

    74      * Write a subarray of bytes.

    75      * @param b the buffer from which the data is to be written

    76      * @param off the start offset of the data

    77      * @param len the number of bytes to be written

    78      */

    79     public void write(byte b[], int off, int len) throws IOException

    80     {

    81         if (len == 0)

    82             return;

    83         if (out == null)

    84             out = owner.writeNotify();

    85         out.write(b, off, len);

    86     }

    87 

    88     /**

    89      * Flush the stream.

    90      */

    91     public void flush() throws IOException

    92     {

    93         if (out != null)

    94             out.flush();

    95     }

    96 

    97     /**

    98      * Close the stream.

    99      */

   100     public void close() throws IOException

   101     {

   102         flush();

   103         owner.close();

   104     }

   105 }