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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 }