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annotate src/com/go/trove/util/UsageSet.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 that orders its elements based on how recently they have been used.
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59 * Most recently used elements appear first in the Set. Elements are marked as
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60 * being used whenever they are added to the Set. To re-position an element,
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61 * re-add it.
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62 *
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63 * @author Brian S O'Neill
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64 * @version
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65 * <!--$$Revision:--> 16 <!-- $-->, <!--$$JustDate:--> 9/07/00 <!-- $-->
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66 */
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67 public class UsageSet extends MapBackedSet {
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68 /**
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69 * Creates a UsageSet in forward order, MRU first.
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70 */
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71 public UsageSet() {
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72 this(new HashMap());
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73 }
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74
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75 /**
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76 * @param backingMap map to use for storage
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77 */
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78 public UsageSet(Map backingMap) {
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79 super(new UsageMap(backingMap));
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80 }
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81
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82 /**
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83 * With reverse order, elements are ordered least recently used first. The
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84 * ordering of the elements will be consistent with the order they were
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85 * added in. Switching to and from reverse order is performed quickly
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86 * and is not affected by the current size of the set.
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87 */
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88 public void setReverseOrder(boolean reverse) {
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89 ((UsageMap)mMap).setReverseOrder(reverse);
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90 }
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91
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92 /**
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93 * Returns the first element in the set, the most recently used. If reverse
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94 * order, then the least recently used is returned.
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95 */
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96 public Object first() throws NoSuchElementException {
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97 return ((UsageMap)mMap).firstKey();
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98 }
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99
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100 /**
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101 * Returns the last element in the set, the least recently used. If reverse
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102 * order, then the most recently used is returned.
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103 */
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104 public Object last() throws NoSuchElementException {
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105 return ((UsageMap)mMap).lastKey();
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106 }
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107 }