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annotate src/org/eclipse/jetty/util/component/Container.java @ 829:dfa742c663f9

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author Franklin Schmidt <fschmidt@gmail.com>
date Thu, 15 Sep 2016 18:16:25 -0600
parents 8e9db0bbf4f9
children
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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 }