Mercurial > hg > blitz_stable
annotate src/EDU/oswego/cs/dl/util/concurrent/PropertyChangeMulticaster.java @ 32:243c74d599bf
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author | Dan Creswell <dan.creswell@gmail.com> |
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date | Sat, 12 Jun 2010 10:41:47 +0100 |
parents | 3dc0c5604566 |
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0
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1 /* |
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2 File: PropertyChangeMulticaster.java |
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3 |
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4 Originally written by Doug Lea and released into the public domain. |
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5 This may be used for any purposes whatsoever without acknowledgment. |
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6 Thanks for the assistance and support of Sun Microsystems Labs, |
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7 and everyone contributing, testing, and using this code. |
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8 |
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9 This class is based on Sun JDK java.beans.VetoableChangeSupport, |
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10 which is copyrighted by Sun. (It shares practically no code, but for |
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11 consistency, the documentation was lifted and adapted here.) |
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12 |
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13 History: |
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14 Date Who What |
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15 14Mar1999 dl first release |
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16 */ |
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17 |
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18 package EDU.oswego.cs.dl.util.concurrent; |
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19 |
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20 import java.beans.PropertyChangeListener; |
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21 import java.beans.PropertyChangeEvent; |
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22 import java.util.HashMap; |
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23 import java.io.Serializable; |
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24 import java.io.ObjectOutputStream; |
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25 import java.io.ObjectInputStream; |
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26 import java.io.IOException; |
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27 |
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28 /** |
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29 * This class is interoperable with java.beans.PropertyChangeSupport, |
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30 * but relies on a streamlined copy-on-write scheme similar to |
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31 * that used in CopyOnWriteArrayList. This leads to much better |
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32 * performance in most event-intensive programs. It also adheres to clarified |
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33 * semantics of add and remove operations. |
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34 * <p> |
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35 * <b>Sample usage.</b> |
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36 * |
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37 * <pre> |
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38 * class Thing { |
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39 * protected Color myColor = Color.red; // an example property |
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40 * |
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41 * protected PropertyChangeMulticaster listeners = |
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42 * new PropertyChangeMulticaster(this); |
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43 * |
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44 * // registration methods, including: |
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45 * void addListener(PropertyChangeListener l) { |
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46 * // Use the `ifAbsent' version to avoid duplicate notifications |
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47 * listeners.addPropertyChangeListenerIfAbsent(l); |
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48 * } |
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49 * |
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50 * public synchronized Color getColor() { // accessor |
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51 * return myColor; |
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52 * } |
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53 * |
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54 * // internal synchronized state change method; returns old value |
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55 * protected synchronized Color assignColor(Color newColor) { |
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56 * Color oldColor = myColor; |
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57 * myColor = newColor; |
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58 * return oldColor; |
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59 * } |
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60 * |
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61 * public void setColor(Color newColor) { |
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62 * // atomically change state |
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63 * Color oldColor = assignColor(newColor); |
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64 * // broadcast change notification without holding synch lock |
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65 * listeners.firePropertyChange("color", oldColor, newColor); |
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66 * } |
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67 * } |
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68 * </pre> |
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69 * <p>[<a href="http://gee.cs.oswego.edu/dl/classes/EDU/oswego/cs/dl/util/concurrent/intro.html"> Introduction to this package. </a>] |
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70 **/ |
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71 |
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72 public class PropertyChangeMulticaster implements Serializable { |
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73 |
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74 // In order to allow this class to be lifted out without using |
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75 // the whole package, the basic mechanics of CopyOnWriteArrayList |
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76 // are used here, but not the class itself. |
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77 // This also makes it barely faster. |
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78 |
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79 /** |
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80 * The array of listeners. Copied on each update |
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81 **/ |
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82 |
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83 protected transient PropertyChangeListener[] listeners = new PropertyChangeListener[0]; |
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84 |
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85 |
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86 /** |
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87 * The object to be provided as the "source" for any generated events. |
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88 * @serial |
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89 */ |
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90 protected final Object source; |
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91 |
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92 /** |
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93 * HashMap for managing listeners for specific properties. |
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94 * Maps property names to PropertyChangeMulticaster objects. |
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95 * @serial |
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96 */ |
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97 protected HashMap children; |
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98 |
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99 /** |
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100 * Return the child associated with property, or null if no such |
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101 **/ |
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102 |
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103 protected synchronized PropertyChangeMulticaster getChild(String propertyName) { |
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104 return (children == null)? null : |
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105 ((PropertyChangeMulticaster)children.get(propertyName)); |
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106 } |
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107 |
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108 |
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109 /** |
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110 * Constructs a <code>PropertyChangeMulticaster</code> object. |
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111 * |
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112 * @param sourceBean The bean to be given as the source for any events. |
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113 * @exception NullPointerException if sourceBean is null |
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114 */ |
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115 |
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116 public PropertyChangeMulticaster(Object sourceBean) { |
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117 if (sourceBean == null) { |
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118 throw new NullPointerException(); |
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119 } |
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120 |
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121 source = sourceBean; |
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122 } |
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123 |
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124 /** |
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125 * Add a VetoableChangeListener to the listener list. |
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126 * The listener is registered for all properties. |
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127 * If the listener is added multiple times, it will |
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128 * receive multiple change notifications upon any firePropertyChange |
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129 * |
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130 * @param listener The PropertyChangeListener to be added |
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131 * @exception NullPointerException If listener is null |
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132 */ |
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133 |
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134 public synchronized void addPropertyChangeListener(PropertyChangeListener listener) { |
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135 |
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136 if (listener == null) throw new NullPointerException(); |
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137 |
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138 int len = listeners.length; |
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139 PropertyChangeListener[] newArray = new PropertyChangeListener[len + 1]; |
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140 if (len > 0) |
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141 System.arraycopy(listeners, 0, newArray, 0, len); |
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142 newArray[len] = listener; |
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143 listeners = newArray; |
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144 } |
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145 |
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146 |
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147 /** |
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148 * Add a PropertyChangeListener to the listener list if it is |
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149 * not already present. |
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150 * The listener is registered for all properties. |
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151 * The operation maintains Set semantics: If the listener is already |
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152 * registered, the operation has no effect. |
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153 * |
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154 * @param listener The PropertyChangeListener to be added |
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155 * @exception NullPointerException If listener is null |
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156 */ |
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157 |
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158 public synchronized void addPropertyChangeListenerIfAbsent(PropertyChangeListener listener) { |
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159 |
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160 if (listener == null) throw new NullPointerException(); |
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161 |
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162 // Copy while checking if already present. |
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163 int len = listeners.length; |
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164 PropertyChangeListener[] newArray = new PropertyChangeListener[len + 1]; |
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165 for (int i = 0; i < len; ++i) { |
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166 newArray[i] = listeners[i]; |
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167 if (listener.equals(listeners[i])) |
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168 return; // already present -- throw away copy |
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169 } |
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170 newArray[len] = listener; |
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171 listeners = newArray; |
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172 } |
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173 |
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174 |
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175 /** |
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176 * Remove a PropertyChangeListener from the listener list. |
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177 * It removes at most one occurrence of the given listener. |
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178 * If the listener was added multiple times it must be removed |
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179 * mulitple times. |
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180 * This removes a PropertyChangeListener that was registered |
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181 * for all properties, and has no effect if registered for only |
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182 * one or more specified properties. |
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183 * |
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184 * @param listener The PropertyChangeListener to be removed |
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185 */ |
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186 |
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187 public synchronized void removePropertyChangeListener(PropertyChangeListener listener) { |
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188 |
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189 int newlen = listeners.length-1; |
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190 if (newlen < 0 || listener == null) return; |
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191 |
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192 // Copy while searching for element to remove |
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193 |
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194 PropertyChangeListener[] newArray = new PropertyChangeListener[newlen]; |
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195 |
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196 for (int i = 0; i < newlen; ++i) { |
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197 if (listener.equals(listeners[i])) { |
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198 // copy remaining and exit |
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199 for (int k = i + 1; k <= newlen; ++k) newArray[k-1] = listeners[k]; |
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200 listeners = newArray; |
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201 return; |
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202 } |
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203 else |
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204 newArray[i] = listeners[i]; |
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205 } |
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206 |
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207 // special-case last cell |
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208 if (listener.equals(listeners[newlen])) |
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209 listeners = newArray; |
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210 } |
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211 |
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212 /** |
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213 * Add a PropertyChangeListener for a specific property. The listener |
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214 * will be invoked only when a call on firePropertyChange names that |
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215 * specific property. However, if a listener is registered both for all |
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216 * properties and a specific property, it will receive multiple |
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217 * notifications upon changes to that property. |
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218 * |
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219 * @param propertyName The name of the property to listen on. |
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220 * @param listener The PropertyChangeListener to be added |
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221 * @exception NullPointerException If listener is null |
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222 */ |
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223 |
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224 public void addPropertyChangeListener(String propertyName, |
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225 PropertyChangeListener listener) { |
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226 |
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227 if (listener == null) throw new NullPointerException(); |
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228 |
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229 PropertyChangeMulticaster child = null; |
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230 |
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231 synchronized(this) { |
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232 if (children == null) |
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233 children = new HashMap(); |
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234 else |
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235 child = (PropertyChangeMulticaster)children.get(propertyName); |
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236 |
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237 if (child == null) { |
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238 child = new PropertyChangeMulticaster(source); |
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239 children.put(propertyName, child); |
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240 } |
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241 } |
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242 |
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243 child.addPropertyChangeListener(listener); |
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244 } |
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245 |
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246 /** |
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247 * Add a PropertyChangeListener for a specific property, if it is not |
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248 * already registered. The listener |
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249 * will be invoked only when a call on firePropertyChange names that |
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250 * specific property. |
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251 * |
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252 * @param propertyName The name of the property to listen on. |
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253 * @param listener The PropertyChangeListener to be added |
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254 * @exception NullPointerException If listener is null |
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255 */ |
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256 |
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257 public void addPropertyChangeListenerIfAbsent(String propertyName, |
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258 PropertyChangeListener listener) { |
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259 |
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260 if (listener == null) throw new NullPointerException(); |
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261 |
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262 PropertyChangeMulticaster child = null; |
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263 |
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264 synchronized(this) { |
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265 if (children == null) |
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266 children = new HashMap(); |
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267 else |
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268 child = (PropertyChangeMulticaster)children.get(propertyName); |
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269 |
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270 if (child == null) { |
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271 child = new PropertyChangeMulticaster(source); |
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272 children.put(propertyName, child); |
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273 } |
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274 } |
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275 |
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276 child.addPropertyChangeListenerIfAbsent(listener); |
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277 } |
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278 |
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279 /** |
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280 * Remove a PropertyChangeListener for a specific property. |
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281 * Affects only the given property. |
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282 * If the listener is also registered for all properties, |
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283 * then it will continue to be registered for them. |
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284 * |
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285 * @param propertyName The name of the property that was listened on. |
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286 * @param listener The PropertyChangeListener to be removed |
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287 */ |
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288 |
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289 public void removePropertyChangeListener(String propertyName, |
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290 PropertyChangeListener listener) { |
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291 |
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292 PropertyChangeMulticaster child = getChild(propertyName); |
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293 if (child != null) |
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294 child.removePropertyChangeListener(listener); |
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295 } |
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296 |
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297 |
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298 /** |
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299 * Helper method to relay evt to all listeners. |
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300 * Called by all public firePropertyChange methods. |
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301 **/ |
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302 |
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303 protected void multicast(PropertyChangeEvent evt) { |
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304 |
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305 PropertyChangeListener[] array; // bind in synch block below |
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306 PropertyChangeMulticaster child = null; |
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307 |
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308 synchronized (this) { |
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309 array = listeners; |
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310 |
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311 if (children != null && evt.getPropertyName() != null) |
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312 child = (PropertyChangeMulticaster)children.get(evt.getPropertyName()); |
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313 } |
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314 |
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315 for (int i = 0; i < array.length; ++i) |
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316 array[i].propertyChange(evt); |
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317 |
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318 if (child != null) |
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319 child.multicast(evt); |
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320 |
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321 } |
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322 |
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323 |
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324 /** |
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325 * Report a bound property update to any registered listeners. |
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326 * No event is fired if old and new are equal and non-null. |
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327 * |
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328 * @param propertyName The programmatic name of the property |
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329 * that was changed. |
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330 * @param oldValue The old value of the property. |
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331 * @param newValue The new value of the property. |
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332 */ |
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333 public void firePropertyChange(String propertyName, |
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334 Object oldValue, Object newValue) { |
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335 |
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336 if (oldValue == null || newValue == null || !oldValue.equals(newValue)) { |
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337 multicast(new PropertyChangeEvent(source, |
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338 propertyName, |
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339 oldValue, |
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340 newValue)); |
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341 } |
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342 |
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343 } |
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344 |
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345 /** |
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346 * Report an int bound property update to any registered listeners. |
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347 * No event is fired if old and new are equal and non-null. |
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348 * <p> |
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349 * This is merely a convenience wrapper around the more general |
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350 * firePropertyChange method that takes Object values. |
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351 * |
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352 * @param propertyName The programmatic name of the property |
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353 * that was changed. |
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354 * @param oldValue The old value of the property. |
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355 * @param newValue The new value of the property. |
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356 */ |
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357 public void firePropertyChange(String propertyName, |
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358 int oldValue, int newValue) { |
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359 if (oldValue != newValue) { |
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360 multicast(new PropertyChangeEvent(source, |
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361 propertyName, |
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362 new Integer(oldValue), |
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363 new Integer(newValue))); |
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364 } |
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365 } |
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366 |
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367 |
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368 /** |
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369 * Report a boolean bound property update to any registered listeners. |
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370 * No event is fired if old and new are equal and non-null. |
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371 * <p> |
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372 * This is merely a convenience wrapper around the more general |
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373 * firePropertyChange method that takes Object values. |
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374 * |
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375 * @param propertyName The programmatic name of the property |
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376 * that was changed. |
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377 * @param oldValue The old value of the property. |
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378 * @param newValue The new value of the property. |
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379 */ |
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380 public void firePropertyChange(String propertyName, |
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381 boolean oldValue, boolean newValue) { |
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382 if (oldValue != newValue) { |
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383 multicast(new PropertyChangeEvent(source, |
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384 propertyName, |
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385 new Boolean(oldValue), |
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386 new Boolean(newValue))); |
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387 } |
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388 } |
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389 |
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390 /** |
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391 * Fire an existing PropertyChangeEvent to any registered listeners. |
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392 * No event is fired if the given event's old and new values are |
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393 * equal and non-null. |
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394 * @param evt The PropertyChangeEvent object. |
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395 */ |
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396 public void firePropertyChange(PropertyChangeEvent evt) { |
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397 Object oldValue = evt.getOldValue(); |
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398 Object newValue = evt.getNewValue(); |
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399 if (oldValue == null || newValue == null || !oldValue.equals(newValue)) |
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400 multicast(evt); |
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401 } |
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402 |
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403 /** |
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404 * Check if there are any listeners for a specific property. |
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405 * If propertyName is null, return whether there are any listeners at all. |
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406 * |
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407 * @param propertyName the property name. |
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408 * @return true if there are one or more listeners for the given property |
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409 * |
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410 */ |
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411 public boolean hasListeners(String propertyName) { |
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412 |
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413 PropertyChangeMulticaster child; |
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414 |
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415 synchronized (this) { |
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416 if (listeners.length > 0) |
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417 return true; |
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418 else if (propertyName == null || children == null) |
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419 return false; |
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420 else { |
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421 child = (PropertyChangeMulticaster)children.get(propertyName); |
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422 if (child == null) |
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423 return false; |
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424 } |
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425 } |
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426 |
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427 return child.hasListeners(null); |
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428 } |
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429 |
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430 |
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431 /** |
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432 * @serialData Null terminated list of <code>PropertyChangeListeners</code>. |
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433 * <p> |
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434 * At serialization time we skip non-serializable listeners and |
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435 * only serialize the serializable listeners. |
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436 * |
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437 */ |
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438 private synchronized void writeObject(ObjectOutputStream s) throws IOException { |
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439 s.defaultWriteObject(); |
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440 |
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441 for (int i = 0; i < listeners.length; i++) { |
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442 PropertyChangeListener l = listeners[i]; |
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443 if (listeners[i] instanceof Serializable) { |
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444 s.writeObject(listeners[i]); |
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445 } |
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446 } |
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447 s.writeObject(null); |
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448 } |
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449 |
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450 |
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451 private void readObject(ObjectInputStream s) throws ClassNotFoundException, IOException { |
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452 listeners = new PropertyChangeListener[0]; // paranoically reset |
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453 s.defaultReadObject(); |
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454 |
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455 Object listenerOrNull; |
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456 while (null != (listenerOrNull = s.readObject())) { |
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457 addPropertyChangeListener((PropertyChangeListener)listenerOrNull); |
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458 } |
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459 } |
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460 |
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461 } |