RepositoryBean


1   /*
2    * Copyright (c) 2003, Inversoft
3    *
4    * This software is distribuable under the GNU Lesser General Public License.
5    * For more information visit gnu.org.
6    */
7   package com.inversoft.verge.repository;
8   
9   
10  import javax.servlet.http.HttpServletRequest  ;
11  import javax.servlet.jsp.PageContext  ;
12  
13  import com.inversoft.beans.BeanException;
14  import com.inversoft.verge.repository.config.Config;
15  import com.inversoft.verge.repository.config.ItemConfig;
16  import com.inversoft.verge.util.WebBean;
17  
18  
19  /**
20   * <p>
21   * This class is a {@link WebBean WebBean} for a repository
22   * item
23   * </p>
24   *
25   * @author  Brian Pontarelli
26   */
27  public class RepositoryBean extends WebBean {
28  
29      private Config config;
30  
31  
32      /**
33       * Constructs a new RepositoryBean that references an item in the repository
34       *
35       * @param   config The Repository config object of the item in the repository
36       */
37      public RepositoryBean(Config config) throws BeanException {
38          super(); // Does not call into initialize
39  
40          assert (config != null) : "config == null";
41  
42          this.config = config;
43  
44          initialize(config.getID(), config.getScope());
45          setBeanClass(((ItemConfig) config).getBeanClass());
46      }
47  
48      /**
49       * Constructs a new RepositoryBean that references an item in the repository
50       *
51       * @param   id The id of the item in the repository
52       */
53      public RepositoryBean(String   id, HttpServletRequest   request)
54      throws BeanException {
55          super(); // Does not call into initialize
56  
57          config = Repository.getInstance().lookupConfig(request, id);
58          if (config == null) {
59              throw new BeanException("Invalid repository id: " + id);
60          }
61  
62          initialize(id, config.getScope());
63          setBeanClass(((ItemConfig) config).getBeanClass());
64      }
65  
66  
67      /**
68       * Returns the instance of the bean, which is retrieved from the Repository
69       *
70       * @param   pageContext This is not used because repository beans currently
71       *          can not reside in the PageContext
72       * @param   request The HttpServletRequest used for looking up the bean if
73       *          it is in the request, session or application scopes
74       * @return  The instance of the bean from the correct scope or a new instance
75       *          of the bean which has been added to the correct scope
76       * @throws  BeanException If there was a problem during instantiation or if
77       *          the scope contains an object that is not the correct class
78       */
79      public Object   getInstance(PageContext   pageContext, HttpServletRequest   request)
80      throws BeanException {
81          return Repository.getInstance().lookupItem(request, config);
82      }
83  }
84
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