LazyCreateContext


1   /**
2    *
3    * Licensed to the Apache Software Foundation (ASF) under one or more
4    * contributor license agreements.  See the NOTICE file distributed with
5    * this work for additional information regarding copyright ownership.
6    * The ASF licenses this file to You under the Apache License, Version 2.0
7    * (the "License"); you may not use this file except in compliance with
8    * the License.  You may obtain a copy of the License at
9    *
10   * http://www.apache.org/licenses/LICENSE-2.0
11   *
12   * Unless required by applicable law or agreed to in writing, software
13   * distributed under the License is distributed on an "AS IS" BASIS,
14   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15   * See the License for the specific language governing permissions and
16   * limitations under the License.
17   */
18  package org.apache.activemq.jndi;
19  
20  import javax.naming.NameNotFoundException  ;
21  import javax.naming.NamingException  ;
22  
23  /**
24   * Allows users to dynamically create items
25   *
26   * @version $Revision: 1.2 $
27   */
28  public abstract class LazyCreateContext extends ReadOnlyContext {
29      public Object   lookup(String   name) throws NamingException   {
30          try {
31              return super.lookup(name);
32          }
33          catch (NameNotFoundException   e) {
34              Object   answer = createEntry(name);
35              if (answer == null) {
36                  throw e;
37              }
38              internalBind(name, answer);
39              return answer;
40          }
41      }
42  
43      protected abstract Object   createEntry(String   name);
44  }
45

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