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Diffstat (limited to 'src/org/apache/http/protocol/UriPatternMatcher.java')
-rw-r--r-- | src/org/apache/http/protocol/UriPatternMatcher.java | 127 |
1 files changed, 127 insertions, 0 deletions
diff --git a/src/org/apache/http/protocol/UriPatternMatcher.java b/src/org/apache/http/protocol/UriPatternMatcher.java new file mode 100644 index 0000000..2870d99 --- /dev/null +++ b/src/org/apache/http/protocol/UriPatternMatcher.java @@ -0,0 +1,127 @@ +/* + * $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()))); + } + } + +} |