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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 (금, 13  7월 2007) $
35   */
36  public class IoSessionOutputStream extends OutputStream {
37      private final IoSession session;
38  
39      private WriteFuture lastWriteFuture;
40  
41      public IoSessionOutputStream(IoSession session) {
42          this.session = session;
43      }
44  
45      @Override
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          lastWriteFuture = session.write(buf);
63      }
64  
65      @Override
66      public void write(byte[] b, int off, int len) throws IOException {
67          write(ByteBuffer.wrap(b.clone(), off, len));
68      }
69  
70      @Override
71      public void write(int b) throws IOException {
72          ByteBuffer buf = ByteBuffer.allocate(1);
73          buf.put((byte) b);
74          buf.flip();
75          write(buf);
76      }
77  
78      @Override
79      public synchronized void flush() throws IOException {
80          if (lastWriteFuture == null) {
81              return;
82          }
83  
84          lastWriteFuture.join();
85          if (!lastWriteFuture.isWritten()) {
86              throw new IOException(
87                      "The bytes could not be written to the session");
88          }
89      }
90  }