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annotate src/org/eclipse/jetty/util/component/Container.java @ 830:7c737c376bc3
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author | Franklin Schmidt <fschmidt@gmail.com> |
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date | Thu, 15 Sep 2016 18:30:38 -0600 |
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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.component; |
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20 import java.lang.ref.WeakReference; |
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21 import java.util.EventListener; |
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22 import java.util.concurrent.CopyOnWriteArrayList; |
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23 |
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24 import org.eclipse.jetty.util.LazyList; |
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25 import org.slf4j.Logger; |
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26 import org.slf4j.LoggerFactory; |
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27 |
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28 /* ------------------------------------------------------------ */ |
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29 /** Container. |
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30 * This class allows a containment events to be generated from update methods. |
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31 * |
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32 * The style of usage is: <pre> |
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33 * public void setFoo(Foo foo) |
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34 * { |
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35 * getContainer().update(this,this.foo,foo,"foo"); |
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36 * this.foo=foo; |
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37 * } |
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38 * |
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39 * public void setBars(Bar[] bars) |
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40 * { |
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41 * getContainer().update(this,this.bars,bars,"bar"); |
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42 * this.bars=bars; |
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43 * } |
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44 * </pre> |
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45 */ |
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46 public class Container |
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47 { |
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48 private static final Logger LOG = LoggerFactory.getLogger(Container.class); |
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49 private final CopyOnWriteArrayList<Container.Listener> _listeners=new CopyOnWriteArrayList<Container.Listener>(); |
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50 |
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51 public void addEventListener(Container.Listener listener) |
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52 { |
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53 _listeners.add(listener); |
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54 } |
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55 |
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56 public void removeEventListener(Container.Listener listener) |
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57 { |
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58 _listeners.remove(listener); |
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59 } |
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60 |
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61 /* ------------------------------------------------------------ */ |
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62 /** Update single parent to child relationship. |
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63 * @param parent The parent of the child. |
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64 * @param oldChild The previous value of the child. If this is non null and differs from <code>child</code>, then a remove event is generated. |
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65 * @param child The current child. If this is non null and differs from <code>oldChild</code>, then an add event is generated. |
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66 * @param relationship The name of the relationship |
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67 */ |
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68 public void update(Object parent, Object oldChild, final Object child, String relationship) |
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69 { |
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70 if (oldChild!=null && !oldChild.equals(child)) |
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71 remove(parent,oldChild,relationship); |
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72 if (child!=null && !child.equals(oldChild)) |
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73 add(parent,child,relationship); |
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74 } |
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75 |
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76 /* ------------------------------------------------------------ */ |
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77 /** Update single parent to child relationship. |
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78 * @param parent The parent of the child. |
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79 * @param oldChild The previous value of the child. If this is non null and differs from <code>child</code>, then a remove event is generated. |
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80 * @param child The current child. If this is non null and differs from <code>oldChild</code>, then an add event is generated. |
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81 * @param relationship The name of the relationship |
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82 * @param addRemove If true add/remove is called for the new/old children as well as the relationships |
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83 */ |
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84 public void update(Object parent, Object oldChild, final Object child, String relationship,boolean addRemove) |
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85 { |
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86 if (oldChild!=null && !oldChild.equals(child)) |
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87 { |
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88 remove(parent,oldChild,relationship); |
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89 if (addRemove) |
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90 removeBean(oldChild); |
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91 } |
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92 |
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93 if (child!=null && !child.equals(oldChild)) |
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94 { |
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95 if (addRemove) |
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96 addBean(child); |
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97 add(parent,child,relationship); |
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98 } |
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99 } |
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100 |
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101 /* ------------------------------------------------------------ */ |
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102 /** Update multiple parent to child relationship. |
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103 * @param parent The parent of the child. |
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104 * @param oldChildren The previous array of children. A remove event is generated for any child in this array but not in the <code>children</code> array. |
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105 * This array is modified and children that remain in the new children array are nulled out of the old children array. |
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106 * @param children The current array of children. An add event is generated for any child in this array but not in the <code>oldChildren</code> array. |
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107 * @param relationship The name of the relationship |
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108 */ |
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109 public void update(Object parent, Object[] oldChildren, final Object[] children, String relationship) |
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110 { |
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111 update(parent,oldChildren,children,relationship,false); |
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112 } |
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113 |
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114 /* ------------------------------------------------------------ */ |
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115 /** Update multiple parent to child relationship. |
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116 * @param parent The parent of the child. |
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117 * @param oldChildren The previous array of children. A remove event is generated for any child in this array but not in the <code>children</code> array. |
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118 * This array is modified and children that remain in the new children array are nulled out of the old children array. |
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119 * @param children The current array of children. An add event is generated for any child in this array but not in the <code>oldChildren</code> array. |
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120 * @param relationship The name of the relationship |
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121 * @param addRemove If true add/remove is called for the new/old children as well as the relationships |
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122 */ |
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123 public void update(Object parent, Object[] oldChildren, final Object[] children, String relationship, boolean addRemove) |
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124 { |
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125 Object[] newChildren = null; |
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126 if (children!=null) |
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127 { |
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128 newChildren = new Object[children.length]; |
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129 |
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130 for (int i=children.length;i-->0;) |
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131 { |
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132 boolean new_child=true; |
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133 if (oldChildren!=null) |
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134 { |
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135 for (int j=oldChildren.length;j-->0;) |
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136 { |
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137 if (children[i]!=null && children[i].equals(oldChildren[j])) |
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138 { |
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139 oldChildren[j]=null; |
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140 new_child=false; |
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141 } |
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142 } |
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143 } |
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144 if (new_child) |
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145 newChildren[i]=children[i]; |
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146 } |
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147 } |
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148 |
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149 if (oldChildren!=null) |
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150 { |
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151 for (int i=oldChildren.length;i-->0;) |
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152 { |
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153 if (oldChildren[i]!=null) |
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154 { |
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155 remove(parent,oldChildren[i],relationship); |
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156 if (addRemove) |
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157 removeBean(oldChildren[i]); |
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158 } |
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159 } |
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160 } |
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161 |
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162 if (newChildren!=null) |
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163 { |
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164 for (int i=0;i<newChildren.length;i++) |
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165 if (newChildren[i]!=null) |
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166 { |
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167 if (addRemove) |
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168 addBean(newChildren[i]); |
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169 add(parent,newChildren[i],relationship); |
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170 } |
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171 } |
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172 } |
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173 |
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174 /* ------------------------------------------------------------ */ |
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175 public void addBean(Object obj) |
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176 { |
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177 if (_listeners!=null) |
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178 { |
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179 for (int i=0; i<LazyList.size(_listeners); i++) |
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180 { |
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181 Listener listener=(Listener)LazyList.get(_listeners, i); |
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182 listener.addBean(obj); |
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183 } |
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184 } |
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185 } |
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186 |
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187 /* ------------------------------------------------------------ */ |
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188 public void removeBean(Object obj) |
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189 { |
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190 if (_listeners!=null) |
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191 { |
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192 for (int i=0; i<LazyList.size(_listeners); i++) |
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193 ((Listener)LazyList.get(_listeners, i)).removeBean(obj); |
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194 } |
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195 } |
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196 |
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197 /* ------------------------------------------------------------ */ |
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198 /** Add a parent child relationship |
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199 * @param parent |
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200 * @param child |
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201 * @param relationship |
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202 */ |
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203 private void add(Object parent, Object child, String relationship) |
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204 { |
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205 if (LOG.isDebugEnabled()) |
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206 LOG.debug("Container "+parent+" + "+child+" as "+relationship); |
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207 if (_listeners!=null) |
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208 { |
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209 Relationship event=new Relationship(this,parent,child,relationship); |
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210 for (int i=0; i<LazyList.size(_listeners); i++) |
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211 ((Listener)LazyList.get(_listeners, i)).add(event); |
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212 } |
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213 } |
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214 |
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215 /* ------------------------------------------------------------ */ |
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216 /** remove a parent child relationship |
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217 * @param parent |
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218 * @param child |
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219 * @param relationship |
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220 */ |
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221 private void remove(Object parent, Object child, String relationship) |
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222 { |
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223 if (LOG.isDebugEnabled()) |
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224 LOG.debug("Container "+parent+" - "+child+" as "+relationship); |
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225 if (_listeners!=null) |
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226 { |
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227 Relationship event=new Relationship(this,parent,child,relationship); |
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228 for (int i=0; i<LazyList.size(_listeners); i++) |
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229 ((Listener)LazyList.get(_listeners, i)).remove(event); |
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230 } |
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231 } |
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232 |
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233 /* ------------------------------------------------------------ */ |
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234 /** A Container event. |
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235 * @see Listener |
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236 */ |
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237 public static class Relationship |
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238 { |
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239 private final WeakReference<Object> _parent; |
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240 private final WeakReference<Object> _child; |
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241 private String _relationship; |
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242 private Container _container; |
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243 |
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244 private Relationship(Container container, Object parent,Object child, String relationship) |
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245 { |
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246 _container=container; |
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247 _parent=new WeakReference<Object>(parent); |
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248 _child=new WeakReference<Object>(child); |
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249 _relationship=relationship; |
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250 } |
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251 |
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252 public Container getContainer() |
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253 { |
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254 return _container; |
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255 } |
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256 |
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257 public Object getChild() |
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258 { |
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259 return _child.get(); |
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260 } |
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261 |
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262 public Object getParent() |
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263 { |
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264 return _parent.get(); |
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265 } |
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266 |
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267 public String getRelationship() |
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268 { |
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269 return _relationship; |
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270 } |
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271 |
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272 @Override |
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273 public String toString() |
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274 { |
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275 return _parent+"---"+_relationship+"-->"+_child; |
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276 } |
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277 |
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278 @Override |
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279 public int hashCode() |
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280 { |
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281 return _parent.hashCode()+_child.hashCode()+_relationship.hashCode(); |
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282 } |
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283 |
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284 @Override |
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285 public boolean equals(Object o) |
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286 { |
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287 if (o==null || !(o instanceof Relationship)) |
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288 return false; |
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289 Relationship r = (Relationship)o; |
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290 return r._parent.get()==_parent.get() && r._child.get()==_child.get() && r._relationship.equals(_relationship); |
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291 } |
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292 } |
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293 |
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294 /* ------------------------------------------------------------ */ |
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295 /** Listener. |
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296 * A listener for Container events. |
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297 */ |
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298 public interface Listener extends EventListener |
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299 { |
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300 public void addBean(Object bean); |
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301 public void removeBean(Object bean); |
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302 public void add(Container.Relationship relationship); |
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303 public void remove(Container.Relationship relationship); |
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304 } |
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305 } |