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 package org.activeio;
18
19 import java.io.IOException;
20
21
22 /***
23 * A SynchChannelFilter can be used as a filter another {@see org.activeio.SynchChannel}
24 * Most {@see org.activeio.SynchChannel} that are not directly accessing the network will
25 * extends the SynchChannelFilter since they act as a filter between the client and the network.
26 *
27 * @version $Revision$
28 */
29 public class FilterSynchChannel implements SynchChannel {
30
31 private final SynchChannel next;
32
33 public FilterSynchChannel(SynchChannel next) {
34 this.next = next;
35 }
36
37 /***
38 * @see org.activeio.Channel#write(org.activeio.channel.Packet)
39 */
40 public void write(Packet packet) throws IOException {
41 next.write(packet);
42 }
43
44 /***
45 * @see org.activeio.Channel#flush()
46 */
47 public void flush() throws IOException {
48 next.flush();
49 }
50
51 /***
52 * @see org.activeio.Disposable#dispose()
53 */
54 public void dispose() {
55 next.dispose();
56 }
57
58 /***
59 * @see org.activeio.Service#start()
60 */
61 public void start() throws IOException {
62 next.start();
63 }
64
65 /***
66 * @see org.activeio.Service#stop(long)
67 */
68 public void stop(long timeout) throws IOException {
69 next.stop(timeout);
70 }
71
72 /***
73 * @return Returns the next.
74 */
75 public SynchChannel getNext() {
76 return next;
77 }
78
79 /***
80 * @see org.activeio.SynchChannel#read(long)
81 */
82 public Packet read(long timeout) throws IOException {
83 return next.read(timeout);
84 }
85
86 public Object narrow(Class target) {
87 if( target.isAssignableFrom(getClass()) ) {
88 return this;
89 }
90 return next.narrow(target);
91 }
92
93 public String toString() {
94 return next.toString();
95 }
96 }