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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.http.config;
29  
30  import java.util.Locale;
31  import java.util.Map;
32  import java.util.concurrent.ConcurrentHashMap;
33  
34  import org.apache.http.annotation.ThreadSafe;
35  
36  /**
37   * Generic registry of items keyed by low-case string ID.
38   *
39   * @since 4.3
40   */
41  @ThreadSafe
42  public final class Registry<I> implements Lookup<I> {
43  
44      private final Map<String, I> map;
45  
46      Registry(final Map<String, I> map) {
47          super();
48          this.map = new ConcurrentHashMap<String, I>(map);
49      }
50  
51      public I lookup(final String key) {
52          if (key == null) {
53              return null;
54          }
55          return map.get(key.toLowerCase(Locale.US));
56      }
57  
58      @Override
59      public String toString() {
60          return map.toString();
61      }
62  
63  }