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 import java.net.URI;
21
22
23 /***
24 * A AsynchChannelFilter can be used as a filter between a {@see org.activeio.AsynchChannel}
25 * and it's {@see org.activeio.ChannelConsumer}. Most {@see org.activeio.AsynchChannel}
26 * that are not directly accessing the network will extends the AsynchChannelFilter since they act as a
27 * filter between the client and the network. O
28 *
29 * @version $Revision$
30 */
31 public class FilterAsynchChannelServer implements AsynchChannelServer, AcceptListener {
32
33 final protected AsynchChannelServer next;
34 protected AcceptListener acceptListener;
35
36 public FilterAsynchChannelServer(AsynchChannelServer next) {
37 this.next = next;
38 if( next == null )
39 throw new IllegalArgumentException("The next AsynchChannelServer cannot be null.");
40 }
41
42 public void setAcceptListener(AcceptListener acceptListener) {
43 this.acceptListener = acceptListener;
44 if (acceptListener == null)
45 next.setAcceptListener(null);
46 else
47 next.setAcceptListener(this);
48
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 * @throws IOException if the next channel has not been set.
61 */
62 public void start() throws IOException {
63 if( acceptListener ==null )
64 throw new IOException("The AcceptListener has not been set.");
65 next.start();
66 }
67
68 /***
69 * @see org.activeio.Service#stop(long)
70 */
71 public void stop(long timeout) throws IOException {
72 next.stop(timeout);
73 }
74
75 public void onAccept(Channel channel) {
76 acceptListener.onAccept(channel);
77 }
78
79 public void onAcceptError(IOException error) {
80 acceptListener.onAcceptError(error);
81 }
82
83 public URI getBindURI() {
84 return next.getBindURI();
85 }
86
87 public URI getConnectURI() {
88 return next.getConnectURI();
89 }
90
91 public Object narrow(Class target) {
92 if( target.isAssignableFrom(getClass()) ) {
93 return this;
94 }
95 return next.narrow(target);
96 }
97
98 public String toString() {
99 return next.toString();
100 }
101 }