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/*
* $HeadURL: http://svn.apache.org/repos/asf/httpcomponents/httpcore/trunk/module-main/src/main/java/org/apache/http/protocol/UriPatternMatcher.java $
* $Revision: 630662 $
* $Date: 2008-02-24 11:40:51 -0800 (Sun, 24 Feb 2008) $
*
* ====================================================================
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation. For more
* information on the Apache Software Foundation, please see
* <http://www.apache.org/>.
*
*/
package org.apache.http.protocol;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
/**
* Maintains a map of objects keyed by a request URI pattern.
* Instances can be looked up by request URI.<br/>
* Patterns may have three formats:
* <ul>
* <li><code>*</code></li>
* <li><code>*<uri></code></li>
* <li><code><uri>*</code></li>
* </ul>
*
* @author <a href="mailto:oleg at ural.ru">Oleg Kalnichevski</a>
*
* @version $Revision: 630662 $
*/
public class UriPatternMatcher {
private final Map handlerMap;
public UriPatternMatcher() {
super();
this.handlerMap = new HashMap();
}
public void register(final String pattern, final Object handler) {
if (pattern == null) {
throw new IllegalArgumentException("URI request pattern may not be null");
}
if (handler == null) {
throw new IllegalArgumentException("HTTP request handelr may not be null");
}
this.handlerMap.put(pattern, handler);
}
public void unregister(final String pattern) {
if (pattern == null) {
return;
}
this.handlerMap.remove(pattern);
}
public void setHandlers(final Map map) {
if (map == null) {
throw new IllegalArgumentException("Map of handlers may not be null");
}
this.handlerMap.clear();
this.handlerMap.putAll(map);
}
public Object lookup(String requestURI) {
if (requestURI == null) {
throw new IllegalArgumentException("Request URI may not be null");
}
//Strip away the query part part if found
int index = requestURI.indexOf("?");
if (index != -1) {
requestURI = requestURI.substring(0, index);
}
// direct match?
Object handler = this.handlerMap.get(requestURI);
if (handler == null) {
// pattern match?
String bestMatch = null;
for (Iterator it = this.handlerMap.keySet().iterator(); it.hasNext();) {
String pattern = (String) it.next();
if (matchUriRequestPattern(pattern, requestURI)) {
// we have a match. is it any better?
if (bestMatch == null
|| (bestMatch.length() < pattern.length())
|| (bestMatch.length() == pattern.length() && pattern.endsWith("*"))) {
handler = this.handlerMap.get(pattern);
bestMatch = pattern;
}
}
}
}
return handler;
}
protected boolean matchUriRequestPattern(final String pattern, final String requestUri) {
if (pattern.equals("*")) {
return true;
} else {
return
(pattern.endsWith("*") && requestUri.startsWith(pattern.substring(0, pattern.length() - 1))) ||
(pattern.startsWith("*") && requestUri.endsWith(pattern.substring(1, pattern.length())));
}
}
}
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