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 }