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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.common;
21  
22  /**
23   * An {@link IoBufferWrapper} that prohibits derivation of the buffer.
24   * It is useful when you want expose your internal buffer which must be
25   * auto-expandable all the time.
26   * 
27   * @author The Apache MINA Project (dev@mina.apache.org)
28   * @version $Rev: 594006 $, $Date: 2007-11-11 19:16:49 -0700 (Sun, 11 Nov 2007) $
29   */
30  public class UnderivableBuffer extends IoBufferWrapper {
31  
32      public UnderivableBuffer(IoBuffer buf) {
33          super(buf);
34          if (buf.isDerived()) {
35              throw new IllegalArgumentException("Derived buffer is not allowed.");
36          }
37      }
38  
39      @Override
40      public IoBuffer asReadOnlyBuffer() {
41          throw new UnsupportedOperationException("Buffer derivation disabled.");
42      }
43  
44      @Override
45      public IoBuffer duplicate() {
46          throw new UnsupportedOperationException("Buffer derivation disabled.");
47      }
48  
49      @Override
50      public IoBuffer slice() {
51          throw new UnsupportedOperationException("Buffer derivation disabled.");
52      }
53  }