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Java > Open Source Codes > org > apache > commons > httpclient > server > HttpRequestHandlerChain


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 JavaDoc;
35 import java.util.ArrayList JavaDoc;
36 import java.util.Iterator JavaDoc;
37 import java.util.List JavaDoc;
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 JavaDoc subhandlers = new ArrayList JavaDoc();
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 JavaDoc {
66         
67         for(Iterator JavaDoc 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 }
77
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