OrderedMap


1   /*******************************************************************************
2    * Copyright (c) 2000, 2004 IBM Corporation and others.
3    * All rights reserved. This program and the accompanying materials 
4    * are made available under the terms of the Common Public License v1.0
5    * which accompanies this distribution, and is available at
6    * http://www.eclipse.org/legal/cpl-v10.html
7    * 
8    * Contributors:
9    *     IBM Corporation - initial API and implementation
10   *******************************************************************************/
11  package org.eclipse.jdt.internal.ui.refactoring.nls;
12  
13  import java.util.HashMap  ;
14  import java.util.Stack  ;
15  
16  public class OrderedMap {
17      
18      private Stack   fStack= new Stack  ();
19      private HashMap   fMap= new HashMap  ();
20      
21      public void push(Object   key, Object   value) {
22          remove(key);
23          fMap.put(key, value);
24          fStack.push(value);
25      }
26      
27      public Object   peek() {
28          if (fStack.isEmpty())
29              return null;
30          return fStack.peek();
31      }
32  
33      public void remove(Object   key) {
34          Object   value= fMap.remove(key);
35          if (value != null)
36              fStack.remove(value);
37      }
38  }
39

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