IntHashMap


1   /*******************************************************************************
2    * Copyright (c) 2004, 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.jface.viewers.deferred;
12  
13  import java.util.HashMap  ;
14  
15  /**
16   * Represents a map of objects onto ints. This is intended for future optimization:
17   * using int primitives would allow for an implementation that doesn't require
18   * additional object allocations for Integers. However, the current implementation
19   * simply delegates to the Java HashMap class. 
20   * 
21   * @since 3.1
22   */
23  /* package */ class IntHashMap {
24      private HashMap   map; 
25      
26      /**
27       * @param size
28       * @param loadFactor
29       */
30      public IntHashMap(int size, float loadFactor) {
31          map = new HashMap  (size, loadFactor);
32      }
33      
34      /**
35       * 
36       */
37      public IntHashMap() {
38          map = new HashMap  ();
39      }
40      
41      /**
42       * @param key
43       */
44      public void remove(Object   key) {
45          map.remove(key);
46      }
47      
48      /**
49       * @param key
50       * @param value
51       */
52      public void put(Object   key, int value) {
53          map.put(key, new Integer  (value));
54      }
55      
56      /**
57       * @param key
58       * @return the int value at the given key 
59       */
60      public int get(Object   key) {
61          return get(key, 0);
62      }
63      
64      /**
65       * @param key
66       * @param defaultValue
67       * @return the int value at the given key, or the default value if this map does not contain the given key
68       */
69      public int get(Object   key, int defaultValue) {
70          Integer   result = (Integer  )map.get(key);
71          
72          if (result != null) {
73              return result.intValue();
74          }
75          
76          return defaultValue;
77      }
78      
79      /**
80       * @param key
81       * @return <code>true</code> if this map contains the given key, <code>false</code> otherwise
82       */
83      public boolean containsKey(Object   key) {
84          return map.containsKey(key);
85      }
86      
87      /**
88       * @return the number of key/value pairs
89       */
90      public int size() {
91          return map.size();
92      }
93  }
94
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