1 /* 2 * ==================================================================== 3 * Licensed to the Apache Software Foundation (ASF) under one 4 * or more contributor license agreements. See the NOTICE file 5 * distributed with this work for additional information 6 * regarding copyright ownership. The ASF licenses this file 7 * to you under the Apache License, Version 2.0 (the 8 * "License"); you may not use this file except in compliance 9 * with the License. You may obtain a copy of the License at 10 * 11 * http://www.apache.org/licenses/LICENSE-2.0 12 * 13 * Unless required by applicable law or agreed to in writing, 14 * software distributed under the License is distributed on an 15 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 16 * KIND, either express or implied. See the License for the 17 * specific language governing permissions and limitations 18 * under the License. 19 * ==================================================================== 20 * 21 * This software consists of voluntary contributions made by many 22 * individuals on behalf of the Apache Software Foundation. For more 23 * information on the Apache Software Foundation, please see 24 * <http://www.apache.org/>. 25 * 26 */ 27 28 package org.apache.hc.core5.http.config; 29 30 import java.util.Locale; 31 import java.util.Map; 32 import java.util.concurrent.ConcurrentHashMap; 33 34 import org.apache.hc.core5.annotation.Contract; 35 import org.apache.hc.core5.annotation.ThreadingBehavior; 36 37 /** 38 * Generic registry of items keyed by low-case string ID. 39 * 40 * @since 4.3 41 */ 42 @Contract(threading = ThreadingBehavior.SAFE) 43 public final class Registry<I> implements Lookup<I> { 44 45 private final Map<String, I> map; 46 47 Registry(final Map<String, I> map) { 48 super(); 49 this.map = new ConcurrentHashMap<>(map); 50 } 51 52 @Override 53 public I lookup(final String key) { 54 if (key == null) { 55 return null; 56 } 57 return map.get(key.toLowerCase(Locale.ROOT)); 58 } 59 60 @Override 61 public String toString() { 62 return map.toString(); 63 } 64 65 }