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annotate src/org/eclipse/jetty/util/LazyList.java @ 1048:2b769da7f67d
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author | Franklin Schmidt <fschmidt@gmail.com> |
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date | Mon, 07 Nov 2016 23:15:42 -0700 |
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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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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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438 { |
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439 if (array==null) |
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440 { |
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441 if (type==null && item!=null) |
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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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445 na[0]=item; |
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446 return na; |
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447 } |
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448 else |
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449 { |
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450 // TODO: Replace with Arrays.copyOf(T[] original, int newLength) from Java 1.6+ |
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451 Class<?> c = array.getClass().getComponentType(); |
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452 @SuppressWarnings("unchecked") |
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453 T[] na = (T[])Array.newInstance(c, Array.getLength(array)+1); |
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454 System.arraycopy(array, 0, na, 0, array.length); |
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455 na[array.length]=item; |
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456 return na; |
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457 } |
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458 } |
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459 |
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460 /* ------------------------------------------------------------ */ |
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461 public static<T> T[] removeFromArray(T[] array, Object item) |
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462 { |
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463 if (item==null || array==null) |
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464 return array; |
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465 for (int i=array.length;i-->0;) |
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466 { |
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467 if (item.equals(array[i])) |
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468 { |
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469 Class<?> c = array==null?item.getClass():array.getClass().getComponentType(); |
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470 @SuppressWarnings("unchecked") |
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471 T[] na = (T[])Array.newInstance(c, Array.getLength(array)-1); |
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472 if (i>0) |
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473 System.arraycopy(array, 0, na, 0, i); |
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474 if (i+1<array.length) |
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475 System.arraycopy(array, i+1, na, i, array.length-(i+1)); |
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476 return na; |
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477 } |
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478 } |
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479 return array; |
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480 } |
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481 |
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482 } |
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483 |