Mercurial > hg > blitz_stable

annotate src/com/go/trove/util/MapBackedSet.java @ 27:511648fa4d64 Version 2.1

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Version to 2.1
author Dan Creswell <dan.creswell@gmail.com>
date Mon, 04 Jan 2010 13:00:40 +0000
parents 3dc0c5604566
children
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1 /* ====================================================================
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2 * Trove - Copyright (c) 1997-2000 Walt Disney Internet Group
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3 * ====================================================================
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4 * The Tea Software License, Version 1.1
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5 *
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6 * Copyright (c) 2000 Walt Disney Internet Group. All rights reserved.
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7 *
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8 * Redistribution and use in source and binary forms, with or without
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9 * modification, are permitted provided that the following conditions
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10 * are met:
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11 *
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12 * 1. Redistributions of source code must retain the above copyright
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13 * notice, this list of conditions and the following disclaimer.
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14 *
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15 * 2. Redistributions in binary form must reproduce the above copyright
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16 * notice, this list of conditions and the following disclaimer in
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17 * the documentation and/or other materials provided with the
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18 * distribution.
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19 *
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20 * 3. The end-user documentation included with the redistribution,
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21 * if any, must include the following acknowledgment:
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22 * "This product includes software developed by the
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23 * Walt Disney Internet Group (http://opensource.go.com/)."
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24 * Alternately, this acknowledgment may appear in the software itself,
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25 * if and wherever such third-party acknowledgments normally appear.
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26 *
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27 * 4. The names "Tea", "TeaServlet", "Kettle", "Trove" and "BeanDoc" must
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28 * not be used to endorse or promote products derived from this
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29 * software without prior written permission. For written
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30 * permission, please contact opensource@dig.com.
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31 *
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32 * 5. Products derived from this software may not be called "Tea",
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33 * "TeaServlet", "Kettle" or "Trove", nor may "Tea", "TeaServlet",
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34 * "Kettle", "Trove" or "BeanDoc" appear in their name, without prior
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35 * written permission of the Walt Disney Internet Group.
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36 *
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37 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
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38 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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39 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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40 * DISCLAIMED. IN NO EVENT SHALL THE WALT DISNEY INTERNET GROUP OR ITS
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41 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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42 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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43 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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44 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
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45 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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46 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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47 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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48 * ====================================================================
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49 *
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50 * For more information about Tea, please see http://opensource.go.com/.
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51 */
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52
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53 package com.go.trove.util;
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54
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55 import java.util.*;
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56
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57 /******************************************************************************
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58 * A set implementation that is backed by any map.
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59 *
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60 * @author Brian S O'Neill
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61 * @version
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62 * <!--$$Revision: 1.1 $-->, <!--$$JustDate:--> 9/07/00 <!-- $-->
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63 */
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64 public class MapBackedSet extends AbstractSet implements java.io.Serializable {
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65 // Dummy value to associate with an Object in the backing Map
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66 private static final Object PRESENT = new Object();
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67
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68 protected final Map mMap;
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69
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70 /**
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71 * @param map The map to back this set.
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72 */
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73 public MapBackedSet(Map map) {
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74 mMap = map;
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75 }
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76
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77 /**
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78 * Returns an iterator over the elements in this set. The elements
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79 * are returned in the order determined by the backing map.
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80 *
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81 * @return an Iterator over the elements in this set.
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82 * @see ConcurrentModificationException
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83 */
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84 public Iterator iterator() {
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85 return mMap.keySet().iterator();
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86 }
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87
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88 /**
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89 * Returns the number of elements in this set (its cardinality).
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90 *
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91 * @return the number of elements in this set (its cardinality).
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92 */
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93 public int size() {
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94 return mMap.size();
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95 }
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96
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97 /**
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98 * Returns true if this set contains no elements.
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99 *
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100 * @return true if this set contains no elements.
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101 */
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102 public boolean isEmpty() {
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103 return mMap.isEmpty();
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104 }
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105
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106 /**
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107 * Returns true if this set contains the specified element.
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108 *
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109 * @return true if this set contains the specified element.
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110 */
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111 public boolean contains(Object obj) {
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112 return mMap.containsKey(obj);
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113 }
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114
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115 /**
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116 * Adds the specified element to this set if it is not already
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117 * present.
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118 *
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119 * @param obj element to be added to this set.
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120 * @return true if the set did not already contain the specified element.
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121 */
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122 public boolean add(Object obj) {
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123 return mMap.put(obj, PRESENT) == null;
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124 }
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125
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126 /**
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127 * Removes the given element from this set if it is present.
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128 *
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129 * @param obj object to be removed from this set, if present.
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130 * @return true if the set contained the specified element.
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131 */
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132 public boolean remove(Object obj) {
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133 return mMap.remove(obj) == PRESENT;
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134 }
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135
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Dan Creswell <dan.creswell@gmail.com>
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136 /**
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137 * Removes all of the elements from this set.
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
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138 */
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Dan Creswell <dan.creswell@gmail.com>
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139 public void clear() {
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140 mMap.clear();
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
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141 }
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
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142 }