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166 lines
5.0 KiB
Java
166 lines
5.0 KiB
Java
/*
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* ====================================================================
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* Licensed to the Apache Software Foundation (ASF) under one
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* or more contributor license agreements. See the NOTICE file
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* distributed with this work for additional information
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* regarding copyright ownership. The ASF licenses this file
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* to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance
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* with the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing,
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* software distributed under the License is distributed on an
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* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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* KIND, either express or implied. See the License for the
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* specific language governing permissions and limitations
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* under the License.
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* ====================================================================
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*
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* This software consists of voluntary contributions made by many
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* individuals on behalf of the Apache Software Foundation. For more
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* information on the Apache Software Foundation, please see
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* <http://www.apache.org/>.
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*
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*/
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package ch.boye.httpclientandroidlib.protocol;
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import java.util.HashMap;
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import java.util.Map;
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import ch.boye.httpclientandroidlib.annotation.GuardedBy;
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import ch.boye.httpclientandroidlib.annotation.ThreadSafe;
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import ch.boye.httpclientandroidlib.util.Args;
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/**
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* Maintains a map of objects keyed by a request URI pattern.
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* <br>
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* Patterns may have three formats:
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* <ul>
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* <li><code>*</code></li>
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* <li><code>*<uri></code></li>
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* <li><code><uri>*</code></li>
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* </ul>
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* <br>
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* This class can be used to resolve an object matching a particular request
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* URI.
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*
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* @since 4.0
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*/
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@ThreadSafe
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public class UriPatternMatcher<T> {
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@GuardedBy("this")
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private final Map<String, T> map;
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public UriPatternMatcher() {
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super();
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this.map = new HashMap<String, T>();
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}
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/**
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* Registers the given object for URIs matching the given pattern.
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*
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* @param pattern the pattern to register the handler for.
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* @param obj the object.
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*/
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public synchronized void register(final String pattern, final T obj) {
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Args.notNull(pattern, "URI request pattern");
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this.map.put(pattern, obj);
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}
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/**
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* Removes registered object, if exists, for the given pattern.
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*
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* @param pattern the pattern to unregister.
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*/
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public synchronized void unregister(final String pattern) {
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if (pattern == null) {
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return;
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}
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this.map.remove(pattern);
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}
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/**
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* @deprecated (4.1) do not use
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*/
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@Deprecated
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public synchronized void setHandlers(final Map<String, T> map) {
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Args.notNull(map, "Map of handlers");
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this.map.clear();
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this.map.putAll(map);
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}
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/**
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* @deprecated (4.1) do not use
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*/
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@Deprecated
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public synchronized void setObjects(final Map<String, T> map) {
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Args.notNull(map, "Map of handlers");
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this.map.clear();
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this.map.putAll(map);
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}
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/**
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* @deprecated (4.1) do not use
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*/
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@Deprecated
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public synchronized Map<String, T> getObjects() {
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return this.map;
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}
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/**
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* Looks up an object matching the given request path.
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*
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* @param path the request path
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* @return object or <code>null</code> if no match is found.
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*/
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public synchronized T lookup(final String path) {
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Args.notNull(path, "Request path");
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// direct match?
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T obj = this.map.get(path);
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if (obj == null) {
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// pattern match?
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String bestMatch = null;
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for (final String pattern : this.map.keySet()) {
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if (matchUriRequestPattern(pattern, path)) {
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// we have a match. is it any better?
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if (bestMatch == null
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|| (bestMatch.length() < pattern.length())
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|| (bestMatch.length() == pattern.length() && pattern.endsWith("*"))) {
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obj = this.map.get(pattern);
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bestMatch = pattern;
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}
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}
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}
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}
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return obj;
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}
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/**
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* Tests if the given request path matches the given pattern.
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*
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* @param pattern the pattern
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* @param path the request path
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* @return <code>true</code> if the request URI matches the pattern,
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* <code>false</code> otherwise.
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*/
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protected boolean matchUriRequestPattern(final String pattern, final String path) {
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if (pattern.equals("*")) {
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return true;
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} else {
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return
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(pattern.endsWith("*") && path.startsWith(pattern.substring(0, pattern.length() - 1))) ||
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(pattern.startsWith("*") && path.endsWith(pattern.substring(1, pattern.length())));
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}
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}
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@Override
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public String toString() {
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return this.map.toString();
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}
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}
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