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1   /***
2    * 
3    * Copyright 2004 Hiram Chirino
4    * 
5    * Licensed under the Apache License, Version 2.0 (the "License"); 
6    * you may not use this file except in compliance with the License. 
7    * You may obtain a copy of the License at 
8    * 
9    * http://www.apache.org/licenses/LICENSE-2.0
10   * 
11   * Unless required by applicable law or agreed to in writing, software
12   * distributed under the License is distributed on an "AS IS" BASIS, 
13   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 
14   * See the License for the specific language governing permissions and 
15   * limitations under the License. 
16   * 
17   **/
18  package org.activeio.filter;
19  
20  import java.io.IOException;
21  
22  import org.activeio.FilterSynchChannel;
23  import org.activeio.Packet;
24  import org.activeio.SynchChannel;
25  
26  /***
27   *
28   */
29  public class PushbackSynchChannel extends FilterSynchChannel {
30  
31      private Packet putback;
32  
33      public PushbackSynchChannel(SynchChannel next) {
34          this(next, null);
35      }
36      
37      public PushbackSynchChannel(SynchChannel next, Packet putback) {
38          super(next);
39          this.putback=putback;
40      }
41      
42      public void putback(Packet packet) {
43          this.putback = packet;
44      }
45      
46      public Packet read(long timeout) throws IOException {
47          if(putback!=null ) {
48              Packet p = putback;
49              putback=null;
50              return p;
51          }
52          return super.read(timeout);
53      }
54  
55  }