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+/*
+ * ====================================================================
+ * 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 ch.boye.httpclientandroidlib.protocol;
+
+import java.util.HashMap;
+import java.util.Map;
+
+import ch.boye.httpclientandroidlib.annotation.GuardedBy;
+import ch.boye.httpclientandroidlib.annotation.ThreadSafe;
+import ch.boye.httpclientandroidlib.util.Args;
+
+/**
+ * Maintains a map of objects keyed by a request URI pattern.
+ * <br>
+ * Patterns may have three formats:
+ * <ul>
+ * <li><code>*</code></li>
+ * <li><code>*&lt;uri&gt;</code></li>
+ * <li><code>&lt;uri&gt;*</code></li>
+ * </ul>
+ * <br>
+ * This class can be used to resolve an object matching a particular request
+ * URI.
+ *
+ * @since 4.0
+ */
+@ThreadSafe
+public class UriPatternMatcher<T> {
+
+ @GuardedBy("this")
+ private final Map<String, T> map;
+
+ public UriPatternMatcher() {
+ super();
+ this.map = new HashMap<String, T>();
+ }
+
+ /**
+ * Registers the given object for URIs matching the given pattern.
+ *
+ * @param pattern the pattern to register the handler for.
+ * @param obj the object.
+ */
+ public synchronized void register(final String pattern, final T obj) {
+ Args.notNull(pattern, "URI request pattern");
+ this.map.put(pattern, obj);
+ }
+
+ /**
+ * Removes registered object, if exists, for the given pattern.
+ *
+ * @param pattern the pattern to unregister.
+ */
+ public synchronized void unregister(final String pattern) {
+ if (pattern == null) {
+ return;
+ }
+ this.map.remove(pattern);
+ }
+
+ /**
+ * @deprecated (4.1) do not use
+ */
+ @Deprecated
+ public synchronized void setHandlers(final Map<String, T> map) {
+ Args.notNull(map, "Map of handlers");
+ this.map.clear();
+ this.map.putAll(map);
+ }
+
+ /**
+ * @deprecated (4.1) do not use
+ */
+ @Deprecated
+ public synchronized void setObjects(final Map<String, T> map) {
+ Args.notNull(map, "Map of handlers");
+ this.map.clear();
+ this.map.putAll(map);
+ }
+
+ /**
+ * @deprecated (4.1) do not use
+ */
+ @Deprecated
+ public synchronized Map<String, T> getObjects() {
+ return this.map;
+ }
+
+ /**
+ * Looks up an object matching the given request path.
+ *
+ * @param path the request path
+ * @return object or <code>null</code> if no match is found.
+ */
+ public synchronized T lookup(final String path) {
+ Args.notNull(path, "Request path");
+ // direct match?
+ T obj = this.map.get(path);
+ if (obj == null) {
+ // pattern match?
+ String bestMatch = null;
+ for (final String pattern : this.map.keySet()) {
+ if (matchUriRequestPattern(pattern, path)) {
+ // we have a match. is it any better?
+ if (bestMatch == null
+ || (bestMatch.length() < pattern.length())
+ || (bestMatch.length() == pattern.length() && pattern.endsWith("*"))) {
+ obj = this.map.get(pattern);
+ bestMatch = pattern;
+ }
+ }
+ }
+ }
+ return obj;
+ }
+
+ /**
+ * Tests if the given request path matches the given pattern.
+ *
+ * @param pattern the pattern
+ * @param path the request path
+ * @return <code>true</code> if the request URI matches the pattern,
+ * <code>false</code> otherwise.
+ */
+ protected boolean matchUriRequestPattern(final String pattern, final String path) {
+ if (pattern.equals("*")) {
+ return true;
+ } else {
+ return
+ (pattern.endsWith("*") && path.startsWith(pattern.substring(0, pattern.length() - 1))) ||
+ (pattern.startsWith("*") && path.endsWith(pattern.substring(1, pattern.length())));
+ }
+ }
+
+ @Override
+ public String toString() {
+ return this.map.toString();
+ }
+
+}