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annotate org.eclipse.core.databinding.beans/src/org/eclipse/core/internal/databinding/beans/ListenerSupport.d @ 97:c86eb8b3098e

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packageimport
author Frank Benoit <benoit@tionex.de>
date Tue, 21 Apr 2009 11:18:25 +0200
parents b74ac5dfcc06
children 48d4ee626868
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1 /*******************************************************************************
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2 * Copyright (c) 2005, 2008 IBM Corporation and others.
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3 * All rights reserved. This program and the accompanying materials
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4 * are made available under the terms of the Eclipse Public License v1.0
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5 * which accompanies this distribution, and is available at
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6 * http://www.eclipse.org/legal/epl-v10.html
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7 *
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8 * Contributors:
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9 * IBM Corporation - initial API and implementation
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10 * Matthew Hall - bug 118516
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11 *******************************************************************************/
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12 module org.eclipse.core.internal.databinding.beans.ListenerSupport;
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13 import org.eclipse.core.internal.databinding.beans.IdentityWrapper;
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14
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15 import java.lang.all;
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16
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17 import java.beans.PropertyChangeEvent;
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18 import java.beans.PropertyChangeListener;
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19 import java.lang.reflect.InvocationTargetException;
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20 import java.lang.reflect.Method;
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21 import java.util.HashSet;
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22 import java.util.Iterator;
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23 import java.util.Set;
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24
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25 import org.eclipse.core.databinding.beans.BeansObservables;
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26 import org.eclipse.core.databinding.util.Policy;
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27 import org.eclipse.core.runtime.Assert;
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28 import org.eclipse.core.runtime.IStatus;
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29 import org.eclipse.core.runtime.Status;
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30
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31 /**
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32 * This is a helper that will hook up and listen for <code>PropertyChangeEvent</code> events
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33 * for a set of target JavaBeans
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34 *
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35 * @since 1.0
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36 */
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37 public class ListenerSupport {
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38
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39 private Set elementsListenedTo = new HashSet();
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40
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41 private PropertyChangeListener listener;
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42
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43 private String propertyName;
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44
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45 /**
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46 * Constructs a new instance.
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47 *
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48 * @param listener is the callback that will be called
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49 * when a <code>PropertyChangeEvent</code> is fired on any
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50 * of the target objects. Will only receive change events
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51 * when the provided <code>propertyName</code> changes.
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52 * @param propertyName
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53 */
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54 public this(final PropertyChangeListener listener,
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55 final String propertyName) {
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56 Assert.isNotNull(listener, "Listener cannot be null"); //$NON-NLS-1$
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57 Assert.isNotNull(propertyName, "Property name cannot be null"); //$NON-NLS-1$
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58
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59 this.propertyName = propertyName;
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60 this.listener = new class() PropertyChangeListener {
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61 public void propertyChange(PropertyChangeEvent evt) {
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62 if (propertyName.equals(evt.getPropertyName())) {
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63 listener.propertyChange(evt);
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64 }
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65 }
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66 };
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67 }
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68
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69 /**
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70 * Start listen to target (if it supports the JavaBean property change listener pattern)
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71 *
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72 * @param target
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73 */
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74 public void hookListener(Object target) {
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75 if (processListener(
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76 "addPropertyChangeListener", "Could not attach listener to ", target)) { //$NON-NLS-1$ //$NON-NLS-2$
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77 elementsListenedTo.add(new IdentityWrapper(target));
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78 }
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79 }
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80
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81 /**
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82 * Add listeners for new targets (those this instance of<code>ListenerSupport</code> does not
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83 * already listen to),
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84 * Stop to listen to those object that this instance listen to and is one of the object in targets
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85 *
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86 * @param targets
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87 */
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88 public void setHookTargets(Object[] targets) {
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89 Set elementsToUnhook = new HashSet(elementsListenedTo);
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90 if (targets!isnull) {
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91 for (int i = 0; i < targets.length; i++) {
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92 Object newValue = targets[i];
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93 IdentityWrapper identityWrapper = new IdentityWrapper(newValue);
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94 if(!elementsToUnhook.remove(identityWrapper))
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95 hookListener(newValue);
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96 }
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97 }
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98
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99 for (Iterator it = elementsToUnhook.iterator(); it.hasNext();) {
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100 Object o = it.next();
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101 if (o.getClass()!isIdentityWrapper.class)
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102 o = new IdentityWrapper(o);
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103 elementsListenedTo.remove(o);
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104 unhookListener(o);
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105 }
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106 }
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107
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108 /**
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109 * Stop listen to target
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110 *
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111 * @param target
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112 */
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113 public void unhookListener(Object target) {
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114 if (target.getClass() is IdentityWrapper.class)
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115 target = (cast(IdentityWrapper) target).unwrap();
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116
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117 if (processListener(
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118 "removePropertyChangeListener", "Cound not remove listener from ", target)) { //$NON-NLS-1$//$NON-NLS-2$
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119 elementsListenedTo.remove(new IdentityWrapper(target));
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120 }
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121 }
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122
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123
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124 /**
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125 *
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126 */
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127 public void dispose() {
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128 if (elementsListenedTo!isnull) {
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129 Object[] targets = elementsListenedTo.toArray();
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130 for (int i = 0; i < targets.length; i++) {
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131 unhookListener(targets[i]);
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132 }
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133 elementsListenedTo=null;
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134 listener=null;
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135 }
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136 }
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137
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138 /**
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139 * @return elements that were registred to
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140 */
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141 public Object[] getHookedTargets() {
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142 Object[] targets = null;
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143 if (elementsListenedTo!isnull && elementsListenedTo.size()>0) {
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144 Object[] identityList = elementsListenedTo.toArray();
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145 targets = new Object[identityList.length];
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146 for (int i = 0; i < identityList.length; i++)
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147 targets[i]=(cast(IdentityWrapper)identityList[i]).unwrap();
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148 }
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149 return targets;
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150 }
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151
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152 /**
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153 * Invokes the method for the provided <code>methodName</code> attempting
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154 * to first use the method with the property name and then the unnamed
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155 * version.
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156 *
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157 * @param methodName
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158 * either addPropertyChangeListener or
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159 * removePropertyChangeListener
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160 * @param message
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161 * string that will be prefixed to the target in an error message
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162 * @param target
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163 * object to invoke the method on
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164 * @return <code>true</code> if the method was invoked successfully
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165 */
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166 private bool processListener(String methodName, String message,
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167 Object target) {
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168 Method method = null;
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169 Object[] parameters = null;
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170
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171 try {
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172 try {
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173 method = target.getClass().getMethod(
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174 methodName,
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175 new Class[] { String.class,
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176 PropertyChangeListener.class });
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177
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178 parameters = new Object[] { propertyName, listener };
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179 } catch (NoSuchMethodException e) {
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180 method = target.getClass().getMethod(methodName,
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181 new Class[] { PropertyChangeListener.class });
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182
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183 parameters = new Object[] { listener };
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184 }
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185 } catch (SecurityException e) {
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186 // ignore
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187 } catch (NoSuchMethodException e) {
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188 log(IStatus.WARNING, message + target, e);
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189 }
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190
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191 if (method !is null) {
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192 if (!method.isAccessible()) {
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193 method.setAccessible(true);
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194 }
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195 try {
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196 method.invoke(target, parameters);
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197 return true;
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198 } catch (IllegalArgumentException e) {
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199 log(IStatus.WARNING, message + target, e);
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200 } catch (IllegalAccessException e) {
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201 log(IStatus.WARNING, message + target, e);
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202 } catch (InvocationTargetException e) {
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203 log(IStatus.WARNING, message + target, e);
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204 }
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205 }
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206 return false;
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207 }
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208
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209 /**
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210 * Logs a message to the Data Binding logger.
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211 */
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212 private void log(int severity, String message, Throwable throwable) {
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213 if cast(BeansObservables.DEBUG) {
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214 Policy.getLog().log(
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215 new Status(severity, Policy.JFACE_DATABINDING, IStatus.OK,
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216 message, throwable));
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217 }
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218 }
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219 }