JndiProvider


1   /**
2    * Copyright (C) 2006 Google Inc.
3    *
4    * Licensed under the Apache License, Version 2.0 (the "License");
5    * you may not use this file except in compliance with the License.
6    * You may obtain a copy of the License at
7    *
8    * http://www.apache.org/licenses/LICENSE-2.0
9    *
10   * Unless required by applicable law or agreed to in writing, software
11   * distributed under the License is distributed on an "AS IS" BASIS,
12   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13   * See the License for the specific language governing permissions and
14   * limitations under the License.
15   */
16  
17  package com.google.inject.example;
18  
19  import com.google.inject.Inject;
20  import com.google.inject.Provider;
21  import javax.naming.Context  ;
22  import javax.naming.NamingException  ;
23  
24  class JndiProvider<T> implements Provider<T> {
25  
26    @Inject Context   context;
27    final String   name;
28    final Class  <T> type;
29  
30    JndiProvider(Class  <T> type, String   name) {
31      this.name = name;
32      this.type = type;
33    }
34  
35    public T get() {
36      try {
37        return type.cast(context.lookup(name));
38      }
39      catch (NamingException   e) {
40        throw new RuntimeException  (e);
41      }
42    }
43  
44    /**
45     * Creates a JNDI provider for the given
46     * type and name.
47     */
48    static <T> Provider<T> fromJndi(
49        Class  <T> type, String   name) {
50      return new JndiProvider<T>(type, name);
51    }
52  }
53

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