ExtensionMap


1   /*******************************************************************************
2    * Copyright (c) 2007 IBM Corporation and others.
3    * All rights reserved. This program and the accompanying materials
4    * are made available under the terms of the Eclipse Public License v1.0
5    * which accompanies this distribution, and is available at
6    * http://www.eclipse.org/legal/epl-v10.html
7    *
8    * Contributors:
9    *     IBM Corporation - initial API and implementation
10   *******************************************************************************/
11  
12  package org.eclipse.ui.internal.intro.impl.model;
13  
14  import java.util.HashMap  ;
15  import java.util.Map  ;
16  
17  /**
18   * This package maintains the mapping between extension ids in the registry and extension ids
19   * as defined in extension files. It also allows a configurer to change the page which will be 
20   * displayed when the welcome screen is shown.
21   */
22  
23  public class ExtensionMap {
24      
25      private static ExtensionMap instance;
26      private static String   startPage;
27      private Map   extensions = new HashMap  ();
28      
29      private ExtensionMap() {
30          
31      }
32      
33      /**
34       * Get the one and only instance of this class
35       * @return
36       */
37      static public ExtensionMap getInstance() {
38          if (instance == null) {
39              instance = new ExtensionMap();
40          }
41          return instance;
42      }
43  
44      /**
45       * Save an association beteen an anchorId and pluginId
46       * @param anchorId the id of an anchor
47       * @param pluginId the plugin which contributed that anchor
48       */
49      public void putPluginId(String   anchorId, String   pluginId) {
50          if (anchorId != null) {
51              extensions.put(anchorId, pluginId);
52          }
53      }
54      
55      /**
56       * Lookup in which plugin 
57       * @param anchorId
58       * @return the plugin which contributed that anchor
59       */
60      public String   getPluginId(String   anchorId) {
61          return (String  )extensions.get(anchorId);
62      }
63  
64      /**
65       * Clear the map and content page
66       */
67      public void clear() {
68          extensions = new HashMap  (); 
69          startPage = null;
70      }
71  
72      /**
73       * called to determine if the configurer has overriden the start page
74       * @return the new start page or null.
75       */
76      public String   getStartPage() {
77          return startPage;
78      }
79      
80      /**
81       * Allows a configurer to override the page which is displayed when 
82       * the welcome screen is first shown
83       * @param contentPage
84       */
85      public void setStartPage(String   contentPage) {
86          startPage = contentPage;
87      }
88  
89  }
90
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