JDIPlaceholderValue


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  package org.eclipse.jdt.internal.debug.core.model;
12  
13  /**
14   * This class is used to create a variable/value that displays a warning message to the user.
15   * Currently used to inform users that references are not available for the current VM.
16   * It extends <code>JDINullValue</code> so that most actions will ignore it, but returns the 
17   * message instead of "null" for it's value.
18   * 
19   * @since 3.3
20   */
21  public class JDIPlaceholderValue extends JDINullValue {
22  
23      private String   fMessage;
24      
25      /**
26       * Constructor, passes the debug target to the super class.
27       * @param target debug target this value belongs to
28       */
29      public JDIPlaceholderValue(JDIDebugTarget target, String   message) {
30          super(target);
31          fMessage = message;
32      }
33      
34      /**
35       * @return the message supplied in the constructor
36       * @see org.eclipse.jdt.internal.debug.core.model.JDINullValue#getValueString()
37       */
38      public String   getValueString() {
39          return fMessage;
40      }
41              
42      /**
43       * @return the message supplied in the constructor
44       * @see org.eclipse.jdt.internal.debug.core.model.JDINullValue#toString()
45       */
46      public String   toString() {
47          return fMessage;
48      }
49      
50      /**
51       * Returns signature for a java string object so that the string message passed in 
52       * the constructor is displayed in the detail pane.
53       * @return signature for a java string object
54       * @see org.eclipse.jdt.internal.debug.core.model.JDINullValue#getSignature()
55       */
56      public String   getSignature() {
57          return "Ljava/lang/String;"; //$NON-NLS-1$
58      }
59      
60  }
61
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