FindImplementorsAction


1   /*******************************************************************************
2    * Copyright (c) 2000, 2006 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  package org.eclipse.jdt.ui.actions;
12  
13  import org.eclipse.ui.IWorkbenchSite;
14  import org.eclipse.ui.PlatformUI;
15  
16  import org.eclipse.jdt.core.ICompilationUnit;
17  import org.eclipse.jdt.core.IJavaElement;
18  import org.eclipse.jdt.core.IType;
19  import org.eclipse.jdt.core.JavaModelException;
20  import org.eclipse.jdt.core.search.IJavaSearchConstants;
21  
22  import org.eclipse.jdt.internal.ui.IJavaHelpContextIds;
23  import org.eclipse.jdt.internal.ui.JavaPluginImages;
24  import org.eclipse.jdt.internal.ui.javaeditor.JavaEditor;
25  import org.eclipse.jdt.internal.ui.search.SearchMessages;
26  
27  /**
28   * Finds implementors of the selected element in the workspace.
29   * The action is applicable to selections representing a Java interface.
30   * 
31   * <p>
32   * This class may be instantiated; it is not intended to be subclassed.
33   * </p>
34   * 
35   * @since 2.0
36   */
37  public class FindImplementorsAction extends FindAction {
38  
39      /**
40       * Creates a new <code>FindImplementorsAction</code>. The action 
41       * requires that the selection provided by the site's selection provider is of type 
42       * <code>org.eclipse.jface.viewers.IStructuredSelection</code>.
43       * 
44       * @param site the site providing context information for this action
45       */
46      public FindImplementorsAction(IWorkbenchSite site) {
47          super(site); 
48      }
49  
50      /**
51       * Note: This constructor is for internal use only. Clients should not call this constructor.
52       * @param editor the Java editor
53       */
54      public FindImplementorsAction(JavaEditor editor) {
55          super(editor); 
56      }
57  
58      void init() {
59          setText(SearchMessages.Search_FindImplementorsAction_label); 
60          setToolTipText(SearchMessages.Search_FindImplementorsAction_tooltip); 
61          setImageDescriptor(JavaPluginImages.DESC_OBJS_SEARCH_DECL);
62          PlatformUI.getWorkbench().getHelpSystem().setHelp(this, IJavaHelpContextIds.FIND_IMPLEMENTORS_IN_WORKSPACE_ACTION);
63      }
64      
65      Class  [] getValidTypes() {
66          return new Class  [] { ICompilationUnit.class, IType.class};
67      }
68  
69      boolean canOperateOn(IJavaElement element) {
70          if (!super.canOperateOn(element))
71              return false;
72  
73          if (element.getElementType() == IJavaElement.TYPE)
74              try {
75                  return ((IType) element).isInterface();
76              } catch (JavaModelException ex) {
77                  return false;
78              }
79          // should not happen: handled by super.canOperateOn
80          return false;
81      }
82  
83      int getLimitTo() {
84          return IJavaSearchConstants.IMPLEMENTORS;
85      }
86  
87      String   getOperationUnavailableMessage() {
88          return SearchMessages.JavaElementAction_operationUnavailable_interface; 
89      }
90  }
91  
92
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