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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 super();
54 }
55
56 public synchronized void clear() {
57 subhandlers.clear();
58 }
59 public synchronized void prependHandler(HttpRequestHandler handler) {
60 subhandlers.add(0,handler);
61 }
62 public synchronized void appendHandler(HttpRequestHandler handler) {
63 subhandlers.add(handler);
64 }
65
66 public synchronized boolean processRequest(
67 final SimpleHttpServerConnection conn,
68 final SimpleRequest request) throws IOException
69 {
70 for(Iterator it=subhandlers.iterator();it.hasNext();) {
71 HttpRequestHandler h = (HttpRequestHandler)it.next();
72 boolean stop = h.processRequest(conn, request);
73 if (stop) {
74 return true;
75 }
76 }
77 return false;
78 }
79 }