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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 05:19:00 +0200 (Fri, 13 Jul 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  }