BeanConnector


1   /*
2    * CoadunationLib: The coaduntion implementation library.
3    * Copyright (C) 2006  Rift IT Contracting
4    * 
5    * This library is free software; you can redistribute it and/or
6    * modify it under the terms of the GNU Lesser General Public
7    * License as published by the Free Software Foundation; either
8    * version 2.1 of the License, or (at your option) any later version.
9    * 
10   * This library is distributed in the hope that it will be useful,
11   * but WITHOUT ANY WARRANTY; without even the implied warranty of
12   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
13   * Lesser General Public License for more details.
14   * 
15   * You should have received a copy of the GNU Lesser General Public
16   * License along with this library; if not, write to the Free Software
17   * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
18   *
19   * XMLConfigurationException.java
20   *
21   * BeanConnector.java
22   *
23   * This class is responsible for supplying connections to the required beans.
24   */
25  
26  // package path
27  package com.rift.coad.lib.deployment.bean;
28  
29  // java imports
30  import java.util.Set  ;
31  
32  // coadunation imports
33  import com.rift.coad.lib.bean.BeanWrapper;
34  
35  /**
36   * This class is responsible for supplying connections to the required beans.
37   *
38   * @author Brett Chaldecott
39   */
40  public class BeanConnector {
41      
42      // the classes private member variables
43      private static BeanConnector singleton = null;
44      private BeanManager beanManager = null;
45      
46      /** 
47       * Creates a new instance of BeanConnector 
48       *
49       * @param beanManager The reference to the bean manager.
50       */
51      private BeanConnector(BeanManager beanManager) {
52          this.beanManager = beanManager;
53      }
54      
55      
56      /**
57       * The method responsible for instanciating a new bean connector.
58       *
59       * @param beanManager The reference to the bean manager.
60       */
61      public static synchronized void init(BeanManager beanManager) {
62          if (singleton == null) {
63              singleton = new BeanConnector(beanManager);
64          }
65      }
66      
67      
68      /**
69       * This method is responsible for returning a reference to the bean
70       * bean connector.
71       *
72       * @return The reference to the bean connector.
73       */
74      public static synchronized BeanConnector getInstance() throws BeanException {
75          if (singleton == null) {
76              throw new BeanException(
77                      "The bean connector has not bean initialized.");
78          }
79          return singleton;
80      }
81      
82      
83      /**
84       * This method returns the list of keys.
85       *
86       * @return The list of beans managed by this object.
87       */
88      public Set   getKeys() {
89          return beanManager.getKeys();
90      }
91      
92      
93      /**
94       * Retrieve the bean that matches the key
95       *
96       * @return Return the object identified by the key.
97       * @param key The key identifying the bean.
98       */
99      public Object   getBean(String   key) {
100         BeanWrapper beanWrapper = (BeanWrapper)beanManager.getBean(key);
101         if (beanWrapper == null) {
102             return beanWrapper;
103         }
104         return beanWrapper.getProxy();
105     }
106 }
107
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