CreateCopyOverrideCommand


1   /**
2    * <copyright>
3    *
4    * Copyright (c) 2002-2004 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: CreateCopyOverrideCommand.java,v 1.3 2005/06/08 06:21:43 nickb Exp $
16   */
17  package org.eclipse.emf.mapping.command;
18  
19  
20  import java.util.Collection  ;
21  import java.util.Collections  ;
22  
23  import org.eclipse.emf.common.command.AbstractCommand;
24  import org.eclipse.emf.ecore.EClass;
25  import org.eclipse.emf.ecore.EObject;
26  import org.eclipse.emf.edit.command.ChildrenToCopyProvider;
27  import org.eclipse.emf.edit.command.CopyCommand;
28  import org.eclipse.emf.edit.command.CreateCopyCommand;
29  import org.eclipse.emf.mapping.MappedObjectState;
30  import org.eclipse.emf.mapping.MappingRoot;
31  import org.eclipse.emf.mapping.domain.MappingDomain;
32  
33  
34  /**
35   * This command overrides the CreateCopyCommand for cross-domain copies.
36   */
37  public class CreateCopyOverrideCommand extends AbstractCommand implements ChildrenToCopyProvider
38  {
39    /**
40     * This keeps track of the mapping domain in which the command operates.
41     */
42    protected MappingDomain mappingDomain;
43  
44    /**
45     * This is the object being copied.
46     */
47    protected EObject owner;
48  
49    /**
50     * This is the copy.
51     */
52    protected EObject copy;
53  
54    /**
55     * This is a map of objects to their copies
56     */
57    protected CopyCommand.Helper copyHelper;
58  
59    /**
60     * This creates a command instance that creates a copy of owner.
61     */
62    public CreateCopyOverrideCommand(MappingDomain domain, CreateCopyCommand createCommand)
63    {
64      super(createCommand.doGetLabel(), createCommand.doGetDescription());
65  
66      this.mappingDomain = domain;
67      this.owner = createCommand.getOwner();
68      this.copyHelper = createCommand.getCopyHelper();
69    }
70  
71    protected boolean prepare()
72    {
73      return true;
74    }
75  
76    public void execute()
77    {
78      // Get the corresponding type.
79      //
80      
81      EClass outputType = (EClass)mappingDomain.getOutputMetaObject(owner.eClass());
82  
83      if (outputType != null)
84      {
85        // Create the copy from this corresponding type.
86        //
87        copy = outputType.getEPackage().getEFactoryInstance().create(outputType);
88  
89        copyHelper.put(owner, copy);
90  
91        MappingRoot mappingRoot = mappingDomain.getMappingRoot();
92        if (mappingRoot.isInputObject(owner))
93        {
94          // This is done to ensure that this new copy is treated as an output by the domain.
95          // The CreateMappingCommand will rely on this setting.
96          //
97          MappedObjectState mappedObjectState = mappingRoot.getMappedObjectState(copy);
98          if (mappedObjectState != null)
99          {
100           mappedObjectState.setOriginatingInput(owner);
101         }
102       }
103     }
104   }
105 
106   public void undo()
107   {
108     copyHelper.remove(owner);
109   }
110 
111   public void redo()
112   {
113     copyHelper.put(owner, copy);
114   }
115 
116   public Collection   getResult()
117   {
118     return Collections.singleton(copy);
119   }
120 
121   public Collection   getChildrenToCopy()
122   {
123     return mappingDomain.getChildren(owner);
124   }
125 
126   /**
127    * This gives an abbreviated name using this object's own class' name, without package qualification,
128    * followed by a space separated list of <tt>field:value</tt> pairs.
129    */
130   public String   toString()
131   {
132     StringBuffer   result = new StringBuffer  (super.toString());
133     result.append(" (mappingDomain: " + mappingDomain + ")");
134     result.append(" (owner: " + owner + ")");
135     result.append(" (copy: " + copy + ")");
136     result.append(" (copyHelper: " + copyHelper + ")");
137 
138     return result.toString();
139   }
140 }
141
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