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 }