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annotate src/org/eclipse/jetty/util/LazyList.java @ 899:3abf945c33e3

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author Franklin Schmidt <fschmidt@gmail.com>
date Fri, 07 Oct 2016 00:02:32 -0600
parents 3428c60d7cfc
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1 //
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2 // ========================================================================
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3 // Copyright (c) 1995-2014 Mort Bay Consulting Pty. Ltd.
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4 // ------------------------------------------------------------------------
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5 // All rights reserved. This program and the accompanying materials
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6 // are made available under the terms of the Eclipse Public License v1.0
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7 // and Apache License v2.0 which accompanies this distribution.
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8 //
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9 // The Eclipse Public License is available at
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10 // http://www.eclipse.org/legal/epl-v10.html
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11 //
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12 // The Apache License v2.0 is available at
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13 // http://www.opensource.org/licenses/apache2.0.php
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14 //
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15 // You may elect to redistribute this code under either of these licenses.
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16 // ========================================================================
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17 //
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18
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19 package org.eclipse.jetty.util;
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20
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21 import java.io.Serializable;
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22 import java.lang.reflect.Array;
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23 import java.util.ArrayList;
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24 import java.util.Arrays;
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25 import java.util.Collection;
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26 import java.util.Collections;
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27 import java.util.Iterator;
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28 import java.util.List;
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29 import java.util.ListIterator;
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30
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31 /* ------------------------------------------------------------ */
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32 /** Lazy List creation.
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33 * A List helper class that attempts to avoid unnecessary List
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34 * creation. If a method needs to create a List to return, but it is
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35 * expected that this will either be empty or frequently contain a
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36 * single item, then using LazyList will avoid additional object
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37 * creations by using {@link Collections#EMPTY_LIST} or
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38 * {@link Collections#singletonList(Object)} where possible.
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39 * <p>
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40 * LazyList works by passing an opaque representation of the list in
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41 * and out of all the LazyList methods. This opaque object is either
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42 * null for an empty list, an Object for a list with a single entry
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43 * or an {@link ArrayList} for a list of items.
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44 *
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45 * <p><h4>Usage</h4>
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46 * <pre>
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47 * Object lazylist =null;
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48 * while(loopCondition)
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49 * {
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50 * Object item = getItem();
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51 * if (item.isToBeAdded())
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52 * lazylist = LazyList.add(lazylist,item);
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53 * }
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54 * return LazyList.getList(lazylist);
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55 * </pre>
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56 *
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57 * An ArrayList of default size is used as the initial LazyList.
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58 *
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59 * @see java.util.List
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60 */
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61 public class LazyList
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62 implements Cloneable, Serializable
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63 {
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64 private static final String[] __EMTPY_STRING_ARRAY = new String[0];
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65
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66 /* ------------------------------------------------------------ */
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67 private LazyList()
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68 {}
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69
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70 /* ------------------------------------------------------------ */
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71 /** Add an item to a LazyList
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72 * @param list The list to add to or null if none yet created.
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73 * @param item The item to add.
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74 * @return The lazylist created or added to.
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75 */
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76 @SuppressWarnings("unchecked")
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77 public static Object add(Object list, Object item)
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78 {
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79 if (list==null)
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80 {
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81 if (item instanceof List || item==null)
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82 {
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83 List<Object> l = new ArrayList<Object>();
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84 l.add(item);
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85 return l;
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86 }
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87
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88 return item;
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89 }
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90
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91 if (list instanceof List)
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92 {
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93 ((List<Object>)list).add(item);
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94 return list;
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95 }
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96
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97 List<Object> l=new ArrayList<Object>();
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98 l.add(list);
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99 l.add(item);
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100 return l;
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101 }
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102
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103 /* ------------------------------------------------------------ */
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104 /** Add an item to a LazyList
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105 * @param list The list to add to or null if none yet created.
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106 * @param index The index to add the item at.
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107 * @param item The item to add.
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108 * @return The lazylist created or added to.
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109 */
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110 @SuppressWarnings("unchecked")
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111 public static Object add(Object list, int index, Object item)
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112 {
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113 if (list==null)
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114 {
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115 if (index>0 || item instanceof List || item==null)
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116 {
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117 List<Object> l = new ArrayList<Object>();
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118 l.add(index,item);
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119 return l;
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120 }
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121 return item;
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122 }
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123
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124 if (list instanceof List)
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125 {
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126 ((List<Object>)list).add(index,item);
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127 return list;
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128 }
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129
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130 List<Object> l=new ArrayList<Object>();
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131 l.add(list);
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132 l.add(index,item);
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133 return l;
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134 }
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135
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136 /* ------------------------------------------------------------ */
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137 /** Add the contents of a Collection to a LazyList
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138 * @param list The list to add to or null if none yet created.
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139 * @param collection The Collection whose contents should be added.
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140 * @return The lazylist created or added to.
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141 */
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142 public static Object addCollection(Object list, Collection<?> collection)
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143 {
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144 Iterator<?> i=collection.iterator();
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145 while(i.hasNext())
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146 list=LazyList.add(list,i.next());
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147 return list;
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148 }
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149
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150 /* ------------------------------------------------------------ */
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151 /** Add the contents of an array to a LazyList
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152 * @param list The list to add to or null if none yet created.
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153 * @param array The array whose contents should be added.
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154 * @return The lazylist created or added to.
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155 */
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156 public static Object addArray(Object list, Object[] array)
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157 {
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158 for(int i=0;array!=null && i<array.length;i++)
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159 list=LazyList.add(list,array[i]);
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160 return list;
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161 }
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162
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163 /* ------------------------------------------------------------ */
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164 /** Ensure the capacity of the underlying list.
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165 *
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166 */
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167 public static Object ensureSize(Object list, int initialSize)
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168 {
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169 if (list==null)
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170 return new ArrayList<Object>(initialSize);
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171 if (list instanceof ArrayList)
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172 {
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173 ArrayList<?> ol=(ArrayList<?>)list;
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174 if (ol.size()>initialSize)
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175 return ol;
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176 ArrayList<Object> nl = new ArrayList<Object>(initialSize);
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177 nl.addAll(ol);
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178 return nl;
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179 }
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180 List<Object> l= new ArrayList<Object>(initialSize);
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181 l.add(list);
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182 return l;
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183 }
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184
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185 /* ------------------------------------------------------------ */
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186 public static Object remove(Object list, Object o)
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187 {
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188 if (list==null)
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189 return null;
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190
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191 if (list instanceof List)
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192 {
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193 List<?> l = (List<?>)list;
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194 l.remove(o);
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195 if (l.size()==0)
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196 return null;
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197 return list;
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198 }
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199
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200 if (list.equals(o))
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201 return null;
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202 return list;
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203 }
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204
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205 /* ------------------------------------------------------------ */
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206 public static Object remove(Object list, int i)
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207 {
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208 if (list==null)
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209 return null;
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210
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211 if (list instanceof List)
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212 {
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213 List<?> l = (List<?>)list;
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214 l.remove(i);
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215 if (l.size()==0)
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216 return null;
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217 return list;
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218 }
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219
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220 if (i==0)
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221 return null;
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222 return list;
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223 }
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224
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225
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226
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227 /* ------------------------------------------------------------ */
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228 /** Get the real List from a LazyList.
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229 *
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230 * @param list A LazyList returned from LazyList.add(Object)
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231 * @return The List of added items, which may be an EMPTY_LIST
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232 * or a SingletonList.
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233 */
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234 public static<E> List<E> getList(Object list)
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235 {
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236 return getList(list,false);
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237 }
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238
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239
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240 /* ------------------------------------------------------------ */
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241 /** Get the real List from a LazyList.
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242 *
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243 * @param list A LazyList returned from LazyList.add(Object) or null
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244 * @param nullForEmpty If true, null is returned instead of an
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245 * empty list.
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246 * @return The List of added items, which may be null, an EMPTY_LIST
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247 * or a SingletonList.
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248 */
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249 @SuppressWarnings("unchecked")
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250 public static<E> List<E> getList(Object list, boolean nullForEmpty)
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251 {
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252 if (list==null)
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253 {
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254 if (nullForEmpty)
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255 return null;
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256 return Collections.emptyList();
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257 }
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258 if (list instanceof List)
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259 return (List<E>)list;
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260
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261 return (List<E>)Collections.singletonList(list);
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262 }
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263
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264
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265 /* ------------------------------------------------------------ */
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266 public static String[] toStringArray(Object list)
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267 {
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268 if (list==null)
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269 return __EMTPY_STRING_ARRAY;
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270
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271 if (list instanceof List)
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272 {
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273 List<?> l = (List<?>)list;
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274 String[] a = new String[l.size()];
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275 for (int i=l.size();i-->0;)
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276 {
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277 Object o=l.get(i);
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278 if (o!=null)
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279 a[i]=o.toString();
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280 }
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281 return a;
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282 }
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283
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284 return new String[] {list.toString()};
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285 }
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286
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287 /* ------------------------------------------------------------ */
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288 /** Convert a lazylist to an array
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289 * @param list The list to convert
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290 * @param clazz The class of the array, which may be a primitive type
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291 * @return array of the lazylist entries passed in
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292 */
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293 public static Object toArray(Object list,Class<?> clazz)
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294 {
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295 if (list==null)
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296 return Array.newInstance(clazz,0);
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297
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298 if (list instanceof List)
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299 {
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300 List<?> l = (List<?>)list;
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301 if (clazz.isPrimitive())
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302 {
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303 Object a = Array.newInstance(clazz,l.size());
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304 for (int i=0;i<l.size();i++)
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305 Array.set(a,i,l.get(i));
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306 return a;
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307 }
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308 return l.toArray((Object[])Array.newInstance(clazz,l.size()));
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309
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310 }
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311
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312 Object a = Array.newInstance(clazz,1);
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313 Array.set(a,0,list);
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314 return a;
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315 }
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316
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317 /* ------------------------------------------------------------ */
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318 /** The size of a lazy List
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319 * @param list A LazyList returned from LazyList.add(Object) or null
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320 * @return the size of the list.
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321 */
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322 public static int size(Object list)
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323 {
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324 if (list==null)
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325 return 0;
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326 if (list instanceof List)
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327 return ((List<?>)list).size();
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328 return 1;
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329 }
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330
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331 /* ------------------------------------------------------------ */
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332 /** Get item from the list
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333 * @param list A LazyList returned from LazyList.add(Object) or null
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334 * @param i int index
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335 * @return the item from the list.
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336 */
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337 @SuppressWarnings("unchecked")
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338 public static <E> E get(Object list, int i)
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339 {
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340 if (list==null)
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341 throw new IndexOutOfBoundsException();
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342
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343 if (list instanceof List)
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344 return (E)((List<?>)list).get(i);
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345
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346 if (i==0)
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347 return (E)list;
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348
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349 throw new IndexOutOfBoundsException();
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350 }
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351
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352 /* ------------------------------------------------------------ */
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353 public static boolean contains(Object list,Object item)
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354 {
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355 if (list==null)
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356 return false;
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357
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358 if (list instanceof List)
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359 return ((List<?>)list).contains(item);
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360
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361 return list.equals(item);
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362 }
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363
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364
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365 /* ------------------------------------------------------------ */
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366 public static Object clone(Object list)
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367 {
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368 if (list==null)
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369 return null;
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370 if (list instanceof List)
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371 return new ArrayList<Object>((List<?>)list);
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372 return list;
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373 }
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374
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375 /* ------------------------------------------------------------ */
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376 public static String toString(Object list)
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377 {
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378 if (list==null)
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379 return "[]";
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380 if (list instanceof List)
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381 return list.toString();
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382 return "["+list+"]";
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383 }
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384
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385 /* ------------------------------------------------------------ */
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386 @SuppressWarnings("unchecked")
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387 public static<E> Iterator<E> iterator(Object list)
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388 {
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389 if (list==null)
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390 {
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391 List<E> empty=Collections.emptyList();
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392 return empty.iterator();
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393 }
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394 if (list instanceof List)
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395 {
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396 return ((List<E>)list).iterator();
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397 }
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398 List<E> l=getList(list);
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399 return l.iterator();
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400 }
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401
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parents:
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402 /* ------------------------------------------------------------ */
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403 @SuppressWarnings("unchecked")
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404 public static<E> ListIterator<E> listIterator(Object list)
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405 {
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406 if (list==null)
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407 {
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408 List<E> empty=Collections.emptyList();
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409 return empty.listIterator();
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410 }
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411 if (list instanceof List)
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412 return ((List<E>)list).listIterator();
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413
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414 List<E> l=getList(list);
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415 return l.listIterator();
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416 }
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417
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418 /* ------------------------------------------------------------ */
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419 /**
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420 * @param array Any array of object
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421 * @return A new <i>modifiable</i> list initialised with the elements from <code>array</code>.
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422 */
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423 public static<E> List<E> array2List(E[] array)
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424 {
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425 if (array==null || array.length==0)
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426 return new ArrayList<E>();
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427 return new ArrayList<E>(Arrays.asList(array));
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428 }
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429
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430 /* ------------------------------------------------------------ */
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431 /** Add element to an array
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432 * @param array The array to add to (or null)
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433 * @param item The item to add
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434 * @param type The type of the array (in case of null array)
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435 * @return new array with contents of array plus item
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436 */
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437 public static<T> T[] addToArray(T[] array, T item, Class<?> type)
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diff changeset
438 {
3428c60d7cfc replace jetty jars with source
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diff changeset
439 if (array==null)
3428c60d7cfc replace jetty jars with source
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parents:
diff changeset
440 {
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diff changeset
441 if (type==null && item!=null)
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diff changeset
442 type= item.getClass();
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443 @SuppressWarnings("unchecked")
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444 T[] na = (T[])Array.newInstance(type, 1);
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diff changeset
445 na[0]=item;
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446 return na;
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447 }
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diff changeset
448 else
3428c60d7cfc replace jetty jars with source
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449 {
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diff changeset
450 // TODO: Replace with Arrays.copyOf(T[] original, int newLength) from Java 1.6+
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diff changeset
451 Class<?> c = array.getClass().getComponentType();
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diff changeset
452 @SuppressWarnings("unchecked")
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diff changeset
453 T[] na = (T[])Array.newInstance(c, Array.getLength(array)+1);
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diff changeset
454 System.arraycopy(array, 0, na, 0, array.length);
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diff changeset
455 na[array.length]=item;
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456 return na;
3428c60d7cfc replace jetty jars with source
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diff changeset
457 }
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parents:
diff changeset
458 }
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parents:
diff changeset
459
3428c60d7cfc replace jetty jars with source
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parents:
diff changeset
460 /* ------------------------------------------------------------ */
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461 public static<T> T[] removeFromArray(T[] array, Object item)
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diff changeset
462 {
3428c60d7cfc replace jetty jars with source
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parents:
diff changeset
463 if (item==null || array==null)
3428c60d7cfc replace jetty jars with source
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464 return array;
3428c60d7cfc replace jetty jars with source
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diff changeset
465 for (int i=array.length;i-->0;)
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diff changeset
466 {
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diff changeset
467 if (item.equals(array[i]))
3428c60d7cfc replace jetty jars with source
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parents:
diff changeset
468 {
3428c60d7cfc replace jetty jars with source
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diff changeset
469 Class<?> c = array==null?item.getClass():array.getClass().getComponentType();
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parents:
diff changeset
470 @SuppressWarnings("unchecked")
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diff changeset
471 T[] na = (T[])Array.newInstance(c, Array.getLength(array)-1);
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parents:
diff changeset
472 if (i>0)
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diff changeset
473 System.arraycopy(array, 0, na, 0, i);
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diff changeset
474 if (i+1<array.length)
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diff changeset
475 System.arraycopy(array, i+1, na, i, array.length-(i+1));
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parents:
diff changeset
476 return na;
3428c60d7cfc replace jetty jars with source
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parents:
diff changeset
477 }
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parents:
diff changeset
478 }
3428c60d7cfc replace jetty jars with source
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parents:
diff changeset
479 return array;
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parents:
diff changeset
480 }
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parents:
diff changeset
481
3428c60d7cfc replace jetty jars with source
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parents:
diff changeset
482 }
3428c60d7cfc replace jetty jars with source
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parents:
diff changeset
483