1 /*
2 * $Header: /home/jerenkrantz/tmp/commons/commons-convert/cvs/home/cvs/jakarta-commons//httpclient/src/test/org/apache/commons/httpclient/server/HttpRequestHandlerChain.java,v 1.6 2004/11/28 15:44:39 olegk Exp $
3 * $Revision: 155418 $
4 * $Date: 2005-02-26 08:01:52 -0500 (Sat, 26 Feb 2005) $
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
51 private List subhandlers = new ArrayList();
52
53 public HttpRequestHandlerChain(final HttpRequestHandlerChain chain) {
54 super();
55 if (chain != null) {
56 this.subhandlers.clear();
57 this.subhandlers.addAll(chain.subhandlers);
58 }
59 }
60
61 public HttpRequestHandlerChain() {
62 super();
63 }
64
65 public synchronized void clear() {
66 subhandlers.clear();
67 }
68
69 public synchronized void prependHandler(HttpRequestHandler handler) {
70 subhandlers.add(0,handler);
71 }
72
73 public synchronized void appendHandler(HttpRequestHandler handler) {
74 subhandlers.add(handler);
75 }
76
77 public synchronized boolean processRequest(
78 final SimpleHttpServerConnection conn,
79 final SimpleRequest request) throws IOException
80 {
81 for(Iterator it=subhandlers.iterator();it.hasNext();) {
82 HttpRequestHandler h = (HttpRequestHandler)it.next();
83 boolean stop = h.processRequest(conn, request);
84 if (stop) {
85 return true;
86 }
87 }
88 return false;
89 }
90 }