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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
 * .
 *
 */

package com.facebook.presto.jdbc.internal.apache.http.protocol;

import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Set;

import com.facebook.presto.jdbc.internal.apache.http.annotation.Contract;
import com.facebook.presto.jdbc.internal.apache.http.annotation.ThreadingBehavior;
import com.facebook.presto.jdbc.internal.apache.http.util.Args;

/**
 * Maintains a map of objects keyed by a request URI pattern.
 * 
* Patterns may have three formats: *
    *
  • {@code *}
  • *
  • {@code *}
  • *
  • {@code *}
  • *
*
* This class can be used to resolve an object matching a particular request * URI. * * @param The type of registered objects. * @since 4.0 */ @Contract(threading = ThreadingBehavior.SAFE) public class UriPatternMatcher { private final Map map; public UriPatternMatcher() { super(); this.map = new HashMap(); } /** * Returns a {@link Set} view of the mappings contained in this matcher. * * @return a set view of the mappings contained in this matcher. * * @see Map#entrySet() * @since 4.4.9 */ public synchronized Set> entrySet() { return new HashSet>(map.entrySet()); } /** * 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 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 map) { Args.notNull(map, "Map of handlers"); this.map.clear(); this.map.putAll(map); } /** * @deprecated (4.1) do not use */ @Deprecated public synchronized Map getObjects() { return this.map; } /** * Looks up an object matching the given request path. * * @param path the request path * @return object or {@code null} 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} if the request URI matches the pattern, * {@code false} 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(); } }




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