1 /*
2 * $Header: /home/cvs/jakarta-commons/httpclient/src/test/org/apache/commons/httpclient/server/HttpRequestHandlerChain.java,v 1.1.2.3 2003/11/24 23:13:22 oglueck Exp $
3 * $Revision: 1.1.2.3 $
4 * $Date: 2003/11/24 23:13:22 $
5 *
6 * ====================================================================
7 *
8 * The Apache Software License, Version 1.1
9 *
10 * Copyright (c) 1999-2003 The Apache Software Foundation. All rights
11 * reserved.
12 *
13 * Redistribution and use in source and binary forms, with or without
14 * modification, are permitted provided that the following conditions
15 * are met:
16 *
17 * 1. Redistributions of source code must retain the above copyright
18 * notice, this list of conditions and the following disclaimer.
19 *
20 * 2. Redistributions in binary form must reproduce the above copyright
21 * notice, this list of conditions and the following disclaimer in
22 * the documentation and/or other materials provided with the
23 * distribution.
24 *
25 * 3. The end-user documentation included with the redistribution, if
26 * any, must include the following acknowlegement:
27 * "This product includes software developed by the
28 * Apache Software Foundation (http://www.apache.org/)."
29 * Alternately, this acknowlegement may appear in the software itself,
30 * if and wherever such third-party acknowlegements normally appear.
31 *
32 * 4. The names "The Jakarta Project", "Commons", and "Apache Software
33 * Foundation" must not be used to endorse or promote products derived
34 * from this software without prior written permission. For written
35 * permission, please contact apache@apache.org.
36 *
37 * 5. Products derived from this software may not be called "Apache"
38 * nor may "Apache" appear in their names without prior written
39 * permission of the Apache Group.
40 *
41 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
42 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
43 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
44 * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
45 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
46 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
47 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
48 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
49 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
50 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
51 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
52 * SUCH DAMAGE.
53 * ====================================================================
54 *
55 * This software consists of voluntary contributions made by many
56 * individuals on behalf of the Apache Software Foundation. For more
57 * information on the Apache Software Foundation, please see
58 * <http://www.apache.org/>.
59 *
60 * [Additional notices, if required by prior licensing conditions]
61 *
62 */
63
64 package org.apache.commons.httpclient.server;
65
66 import java.io.IOException;
67 import java.util.ArrayList;
68 import java.util.Iterator;
69 import java.util.List;
70
71 /***
72 * Maintains a chain of {@link HttpRequestHandler}s where new request-handlers
73 * can be prepended/appended.
74 *
75 * For each call to {@link #processRequest(ResponseWriter,SimpleHttpServerConnection,RequestLine,Header[])}
76 * we iterate over the chain from the start to the end, stopping as soon as a handler
77 * has claimed the output.
78 *
79 * @author Christian Kohlschuetter
80 */
81 public class HttpRequestHandlerChain implements HttpRequestHandler {
82 private List subhandlers = new ArrayList();
83
84 public HttpRequestHandlerChain() {
85 }
86
87 public synchronized void clear() {
88 subhandlers.clear();
89 }
90 public synchronized void prependHandler(HttpRequestHandler handler) {
91 subhandlers.add(0,handler);
92 }
93 public synchronized void appendHandler(HttpRequestHandler handler) {
94 subhandlers.add(handler);
95 }
96
97 public synchronized boolean processRequest(SimpleHttpServerConnection conn) throws IOException {
98
99 for(Iterator it=subhandlers.iterator();it.hasNext();) {
100 HttpRequestHandler h = (HttpRequestHandler)it.next();
101 boolean stop = h.processRequest(conn);
102 if (stop) {
103 return true;
104 }
105 }
106 return false;
107 }
108 }
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