Mercurial > hg > blitz_stable

annotate src/com/go/trove/util/SortedArrayList.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 * An extension of ArrayList that insures that all of the items added are
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59 * sorted. A binary search method has been added to provide a quick way to
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60 * auto sort this Collection. The method call for this search has been made
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61 * public so that this Collection can be searched.
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62 * Note: Not all methods for adding and removing elements are supported.
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63 *
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64 * @author Sean T. Treat
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65 * @version
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66 * @see java.util.Collection
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67 * @see java.util.List
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68 * @see java.util.ArrayList
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69 * <!--$$Revision: 1.1 $-->, <!--$$JustDate:--> 5/04/01 <!-- $-->
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70 */
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71 public class SortedArrayList extends ArrayList {
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72
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73 //
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74 // Data Members
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75 //
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76
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77 private Comparator mComparator = null;
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78
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79 /**
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80 * Constructs a new SortedArrayList. To guarantee that this Collection
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81 * is properly sorted, this constructor should be called.
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82 * @param c The comparator to use when sorting this Collection.
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83 */
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84 public SortedArrayList(Comparator c) {
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85 mComparator = c;
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86 }
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87
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88 public SortedArrayList() {
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89 }
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90
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91 public SortedArrayList(Collection c) {
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92 addAll(c);
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93 }
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94
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95 /**
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96 * @return the Comparator that has been assigned to this Collection.
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97 */
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98 public Comparator comparator() {
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99 return mComparator;
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100 }
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101
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102 /**
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103 * Adds an Object to this Collection.
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104 * @param o The Object to be added.
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105 * @return true if this Collection is modified as a result of this call.
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106 */
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107 public boolean add(Object o) {
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108 // find the index where this item should go
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109 // add the item @ the specified index
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110 int idx = 0;
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111 if(!isEmpty()) {
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112 idx = findInsertionPoint(o);
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113 }
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114
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115 try {
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116 super.add(idx, o);
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117 }
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118 catch(IndexOutOfBoundsException e) {
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119 return false;
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120 }
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121 return true;
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122 }
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123
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124 /**
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125 * Add all of the elements in the c to this List.
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126 * @param c The Collection that is to be added.
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127 * @return true if this Collection is altered. Otherwise, false.
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128 */
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129 public boolean addAll(Collection c) {
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130 Iterator i = c.iterator();
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131 boolean changed = false;
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132 boolean ret;
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133 while(i.hasNext()) {
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134 ret = add(i.next());
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135 if(!changed) {
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136 changed = ret;
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137 }
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138 }
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139 return changed;
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140 }
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141
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142 /**
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Dan Creswell <dan.creswell@gmail.com>
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143 * Retrieves the last element in this List.
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Dan Creswell <dan.creswell@gmail.com>
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144 * @exception Thrown if this List is empty.
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Dan Creswell <dan.creswell@gmail.com>
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145 */
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146 public Object lastElement() throws NoSuchElementException {
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147 if(isEmpty()) {
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148 throw new NoSuchElementException();
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149 }
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150
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151 return get(size()-1);
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152 }
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153
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Dan Creswell <dan.creswell@gmail.com>
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154 /**
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Dan Creswell <dan.creswell@gmail.com>
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155 * Finds the index at which o should be inserted.
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156 * @param o The Object that is to be inserted.
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157 * @return The index where Object o should be inserted.
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158 */
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159 public int findInsertionPoint(Object o) {
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160 return findInsertionPoint(o, 0, size()-1);
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161 }
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162
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Dan Creswell <dan.creswell@gmail.com>
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163 //
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Dan Creswell <dan.creswell@gmail.com>
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164 // Unsupported Methods
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165 //
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166
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Dan Creswell <dan.creswell@gmail.com>
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167 /**
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168 * @exception This method not supported.
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169 */
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170 public void add(int index, Object element) {
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171 System.out.println("add");
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172 throw new UnsupportedOperationException("add(int index, Object element is not Supported");
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173 }
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174
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Dan Creswell <dan.creswell@gmail.com>
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175 /**
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176 * @exception This method not supported.
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177 */
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178 public Object set(int index, Object element) {
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179 throw new UnsupportedOperationException("set(int index, Object element) is not Supported");
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180 }
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181
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Dan Creswell <dan.creswell@gmail.com>
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182 /**
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Dan Creswell <dan.creswell@gmail.com>
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183 * @exception This method not supported.
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184 */
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185 public boolean addAll(int index, Collection c) {
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186 throw new UnsupportedOperationException("addAll(int index, Collection c) is not Supported");
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187 }
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188
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Dan Creswell <dan.creswell@gmail.com>
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189 //
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190 // Private Methods
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191 //
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192
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193 /**
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194 * Compares two keys using the correct comparison method for this
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195 * Collection.
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196 * @param k1 The first item to be compared.
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197 * @param k2 The second item to be compared.
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198 * @return a positive or negative integer if they differ, and zero if
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199 * equal.
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200 */
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201 private int compare(Object k1, Object k2) {
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202 return (mComparator==null ? ((Comparable)k1).compareTo(k2)
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203 : mComparator.compare(k1, k2));
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204 }
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205
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Dan Creswell <dan.creswell@gmail.com>
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206 /**
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Dan Creswell <dan.creswell@gmail.com>
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207 * Conducts a binary search to find the index where Object o should
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208 * be inserted.
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209 * @param o The Object that is to be inserted.
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210 * @param startIndex The starting point for the search.
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211 * @param endIndex The end boundary for this search.
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212 * @return The index where Object o should be inserted.
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213 */
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214 private int findInsertionPoint(Object o, int startIndex, int endIndex) {
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215
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216 int halfPt = ((endIndex - startIndex)/2) + startIndex;
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217 int delta = compare(get(halfPt), o);
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218
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219 if(delta < 0) {
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220 endIndex = halfPt;
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Dan Creswell <dan.creswell@gmail.com>
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221 }
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222 else if(delta > 0) {
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diff changeset
223 startIndex = halfPt;
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Dan Creswell <dan.creswell@gmail.com>
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224 }
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225 else {
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226 // System.out.println("halfPt: " + halfPt);
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227 return halfPt;
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228 }
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229
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Dan Creswell <dan.creswell@gmail.com>
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230 // the object in question falls between two elements
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diff changeset
231 if((endIndex - startIndex) <= 1) {
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232 // System.out.println("endIndex: " + endIndex);
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233 return endIndex+1;
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234 }
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235
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236 return findInsertionPoint(o, startIndex, endIndex);
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237 }
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
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238 }