1 /*
2 * $Header: /home/cvs/jakarta-commons/httpclient/src/test/org/apache/commons/httpclient/server/HttpRequestHandlerChain.java,v 1.1.2.4 2004/02/22 18:21:18 olegk Exp $
3 * $Revision: 1.1.2.4 $
4 * $Date: 2004/02/22 18:21:18 $
5 *
6 * ====================================================================
7 *
8 * Copyright 1999-2004 The Apache Software Foundation
9 *
10 * Licensed under the Apache License, Version 2.0 (the "License");
11 * you may not use this file except in compliance with the License.
12 * You may obtain a copy of the License at
13 *
14 * http://www.apache.org/licenses/LICENSE-2.0
15 *
16 * Unless required by applicable law or agreed to in writing, software
17 * distributed under the License is distributed on an "AS IS" BASIS,
18 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
19 * See the License for the specific language governing permissions and
20 * limitations under the License.
21 * ====================================================================
22 *
23 * This software consists of voluntary contributions made by many
24 * individuals on behalf of the Apache Software Foundation. For more
25 * information on the Apache Software Foundation, please see
26 * <http://www.apache.org/>.
27 *
28 * [Additional notices, if required by prior licensing conditions]
29 *
30 */
31
32 package org.apache.commons.httpclient.server;
33
34 import java.io.IOException;
35 import java.util.ArrayList;
36 import java.util.Iterator;
37 import java.util.List;
38
39 /***
40 * Maintains a chain of {@link HttpRequestHandler}s where new request-handlers
41 * can be prepended/appended.
42 *
43 * For each call to {@link #processRequest(ResponseWriter,SimpleHttpServerConnection,RequestLine,Header[])}
44 * we iterate over the chain from the start to the end, stopping as soon as a handler
45 * has claimed the output.
46 *
47 * @author Christian Kohlschuetter
48 */
49 public class HttpRequestHandlerChain implements HttpRequestHandler {
50 private List subhandlers = new ArrayList();
51
52 public HttpRequestHandlerChain() {
53 }
54
55 public synchronized void clear() {
56 subhandlers.clear();
57 }
58 public synchronized void prependHandler(HttpRequestHandler handler) {
59 subhandlers.add(0,handler);
60 }
61 public synchronized void appendHandler(HttpRequestHandler handler) {
62 subhandlers.add(handler);
63 }
64
65 public synchronized boolean processRequest(SimpleHttpServerConnection conn) throws IOException {
66
67 for(Iterator it=subhandlers.iterator();it.hasNext();) {
68 HttpRequestHandler h = (HttpRequestHandler)it.next();
69 boolean stop = h.processRequest(conn);
70 if (stop) {
71 return true;
72 }
73 }
74 return false;
75 }
76 }