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1   /*
2    *  Licensed to the Apache Software Foundation (ASF) under one
3    *  or more contributor license agreements.  See the NOTICE file
4    *  distributed with this work for additional information
5    *  regarding copyright ownership.  The ASF licenses this file
6    *  to you under the Apache License, Version 2.0 (the
7    *  "License"); you may not use this file except in compliance
8    *  with the License.  You may obtain a copy of the License at
9    *  
10   *    http://www.apache.org/licenses/LICENSE-2.0
11   *  
12   *  Unless required by applicable law or agreed to in writing,
13   *  software distributed under the License is distributed on an
14   *  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
15   *  KIND, either express or implied.  See the License for the
16   *  specific language governing permissions and limitations
17   *  under the License. 
18   *  
19   */
20  package org.apache.mina.handler.support;
21  
22  import java.io.IOException;
23  import java.io.OutputStream;
24  
25  import org.apache.mina.common.ByteBuffer;
26  import org.apache.mina.common.IoSession;
27  import org.apache.mina.common.WriteFuture;
28  
29  /**
30   * An {@link OutputStream} that forwards all write operations to
31   * the associated {@link IoSession}.
32   *
33   * @author The Apache Directory Project (mina-dev@directory.apache.org)
34   * @version $Rev: 555855 $, $Date: 2007-07-13 12:19:00 +0900 (Fri, 13 Jul 2007) $
35   *
36   */
37  public class IoSessionOutputStream extends OutputStream {
38      private final IoSession session;
39  
40      private WriteFuture lastWriteFuture;
41  
42      public IoSessionOutputStream(IoSession session) {
43          this.session = session;
44      }
45  
46      public void close() throws IOException {
47          try {
48              flush();
49          } finally {
50              session.close().join();
51          }
52      }
53  
54      private void checkClosed() throws IOException {
55          if (!session.isConnected()) {
56              throw new IOException("The session has been closed.");
57          }
58      }
59  
60      private synchronized void write(ByteBuffer buf) throws IOException {
61          checkClosed();
62          WriteFuture future = session.write(buf);
63          lastWriteFuture = future;
64      }
65  
66      public void write(byte[] b, int off, int len) throws IOException {
67          write(ByteBuffer.wrap((byte[]) b.clone(), off, len));
68      }
69  
70      public void write(int b) throws IOException {
71          ByteBuffer buf = ByteBuffer.allocate(1);
72          buf.put((byte) b);
73          buf.flip();
74          write(buf);
75      }
76  
77      public synchronized void flush() throws IOException {
78          if (lastWriteFuture == null) {
79              return;
80          }
81  
82          lastWriteFuture.join();
83          if (!lastWriteFuture.isWritten()) {
84              throw new IOException(
85                      "The bytes could not be written to the session");
86          }
87      }
88  }