PersonSearchFilterItemEditorHelperRegistry


1   /*
2    * Created  on Dec 16, 2004
3    *                  by alex
4    *
5    */
6   package com.nightlabs.ipanema.person.search;
7   
8   import java.util.HashMap  ;
9   import java.util.Map  ;
10  
11  /**
12   * This registry holds PersonSearchFilterItemEditorHelper 
13   * linked to classes of PersonStructFields.
14   * 
15   * @author Alexander Bieber <alex[AT]nightlabs[DOT]de>
16   */
17  public class PersonSearchFilterItemEditorHelperRegistry {
18  
19      /**
20       * key: Class AbstractPersonStructFieldClass<br/>
21       * value: PersonSearchFilterItemEditorHelper personSearchFilterItemEditorHelper<br/>
22       */
23      private Map   itemEditorHelpers = new HashMap  ();
24      
25      /**
26       * Adds a PersonSearchFilterItemEditorHelper linked to the
27       * given class name to the registry. 
28       * 
29       * @param itemClassName
30       * @param itemEditor
31       */
32      public void addItemEditor(Class   structFieldClass, PersonSearchFilterItemEditorHelper editorHelper) {
33          itemEditorHelpers.put(structFieldClass,editorHelper);
34      }
35      
36      /**
37       * Removes the PersonSearchFilterItemEditorHelper from the
38       * registry.
39       * 
40       * @param itemClassName
41       */
42      public void removeItemEditor(Class   structFieldClass) {
43          if (!itemEditorHelpers.containsKey(structFieldClass))
44              return;
45          itemEditorHelpers.remove(structFieldClass);
46      }
47      
48      
49      /**
50       * Returns a new instance of a PersonSearchFilterItemEditorHelper.
51       * 
52       * @param searchFieldClass
53       * @return
54       * @throws SearchFilterItemEditorNotFoundException
55       */
56      public PersonSearchFilterItemEditorHelper getEditorHelper(Class   structFieldClass) 
57      throws PersonSearchFilterItemEditorHelperNotFoundException {
58          PersonSearchFilterItemEditorHelper editorHelper = (PersonSearchFilterItemEditorHelper)itemEditorHelpers.get(structFieldClass);
59          if (editorHelper != null)
60              return editorHelper.newInstance();
61          else
62              throw new PersonSearchFilterItemEditorHelperNotFoundException("Registry does not contain an entry for "+structFieldClass.getName());
63      }
64      
65      
66      private static PersonSearchFilterItemEditorHelperRegistry sharedInstance;
67      
68      public static PersonSearchFilterItemEditorHelperRegistry getSharedInstance() {
69          if (sharedInstance == null) {
70              sharedInstance = new PersonSearchFilterItemEditorHelperRegistry();
71          }
72          return sharedInstance;
73      }
74  
75  }
76
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