PreferenceArbiter


1   /*******************************************************************************
2    * Copyright (c) 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.ui.internal.intro.universal.util;
12  
13  import java.util.HashMap  ;
14  import java.util.Map  ;
15  
16  /*
17   * Accepts a set of Objects that represents each product's preference over some
18   * matter (e.g. where an item should appear in welcome) and provides a final ruling
19   * on which Object to use.
20   */
21  public class PreferenceArbiter {
22  
23      private Map   references;
24      private Object   leader;
25      
26      public void consider(Object   obj) {
27          if (obj != null) {
28              if (references == null) {
29                  references = new HashMap  ();
30              }
31              int[] count = (int[])references.get(obj);
32              if (count == null) {
33                  count = new int[] { 0 };
34                  references.put(obj, count);
35              }
36              ++count[0];
37              if (obj != leader) {
38                  if (leader == null) {
39                      leader = obj;
40                  }
41                  else if (count[0] > ((int[])references.get(leader))[0]) {
42                      leader = obj;
43                  }
44              }
45          }
46      }
47      
48      public Object   getWinner() {
49          return leader;
50      }
51  }
52
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