CreateChildAction


1   /**
2    * <copyright> 
3    *
4    * Copyright (c) 2002-2005 IBM Corporation and others.
5    * All rights reserved.   This program and the accompanying materials
6    * are made available under the terms of the Eclipse Public License v1.0
7    * which accompanies this distribution, and is available at
8    * http://www.eclipse.org/legal/epl-v10.html
9    * 
10   * Contributors: 
11   *   IBM - Initial API and implementation
12   *
13   * </copyright>
14   *
15   * $Id: CreateChildAction.java,v 1.3 2005/06/08 06:20:52 nickb Exp $
16   */
17  package org.eclipse.emf.edit.ui.action;
18  
19  
20  import java.util.Collection  ;
21  
22  import org.eclipse.jface.viewers.ISelection;
23  import org.eclipse.ui.IEditorPart;
24  import org.eclipse.ui.IWorkbenchPart;
25  
26  import org.eclipse.emf.common.command.Command;
27  import org.eclipse.emf.common.command.UnexecutableCommand;
28  import org.eclipse.emf.edit.command.CreateChildCommand;
29  import org.eclipse.emf.edit.domain.EditingDomain;
30  
31  
32  /**
33   * A child creation action is implemented by creating a {@link
34   * CreateChildCommand}.
35   */
36  public class CreateChildAction extends StaticSelectionCommandAction
37  {
38    /**
39     * This describes the child to be created.
40     */
41    protected Object   descriptor;
42  
43    /**
44     * This constructs an instance of an action that creates a child
45     * specified by <code>descriptor</code> for the single object in the
46     * <code>selection</code>.
47     * @since 2.1.0
48     */
49    public CreateChildAction(IWorkbenchPart workbenchPart, ISelection selection,
50                             Object   descriptor)
51    {
52      super(workbenchPart);
53      this.descriptor = descriptor;
54      configureAction(selection);
55    }
56  
57    /**
58     * This constructor is simply retained for binary compatibility. It just
59     * calls the {@link #CreateChildAction(IWorkbenchPart, ISelection, Object)
60     * new form}.
61     */
62    public CreateChildAction(IEditorPart editorPart, ISelection selection,
63                             Object   descriptor)
64    {
65      this((IWorkbenchPart)editorPart, selection, descriptor);
66    }
67  
68    /**
69     * This creates the command for {@link
70     * StaticSelectionCommandAction#createActionCommand}.
71     */
72    protected Command createActionCommand(EditingDomain editingDomain,
73                                          Collection   collection)
74    {
75      if (collection.size() == 1)
76      {
77        Object   owner = collection.iterator().next();
78        return CreateChildCommand.create(editingDomain, owner,
79                                         descriptor, collection);
80      }
81      return UnexecutableCommand.INSTANCE;
82    }
83  }
84
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