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annotate org.eclipse.core.databinding.beans/src/org/eclipse/core/internal/databinding/beans/JavaBeanObservableValue.d @ 98:48d4ee626868

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rm databinding.observable seems to be duplicate, databinding.beans now building
author Frank Benoit <benoit@tionex.de>
date Wed, 22 Apr 2009 07:30:21 +0200
parents c86eb8b3098e
children
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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 * Brad Reynolds - bug 164653
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11 * Brad Reynolds - bug 164134, 171616
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12 *******************************************************************************/
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13 module org.eclipse.core.internal.databinding.beans.JavaBeanObservableValue;
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14 import org.eclipse.core.internal.databinding.beans.ListenerSupport;
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15
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16 import java.lang.all;
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17
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18 import java.beans.PropertyChangeListener;
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19 import java.beans.PropertyDescriptor;
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20 import java.lang.reflect.InvocationTargetException;
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21 import java.lang.reflect.Method;
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22
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23 import org.eclipse.core.databinding.BindingException;
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24 import org.eclipse.core.databinding.beans.BeansObservables;
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25 import org.eclipse.core.databinding.beans.IBeanObservable;
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26 import org.eclipse.core.databinding.observable.Diffs;
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27 import org.eclipse.core.databinding.observable.Realm;
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28 import org.eclipse.core.databinding.observable.value.AbstractObservableValue;
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29 import org.eclipse.core.databinding.observable.value.ValueDiff;
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30 import org.eclipse.core.databinding.util.Policy;
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31 import org.eclipse.core.internal.databinding.Util;
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32 import org.eclipse.core.runtime.IStatus;
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33 import org.eclipse.core.runtime.Status;
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34
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35 /**
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36 * @since 1.0
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37 *
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38 */
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39 public class JavaBeanObservableValue : AbstractObservableValue , IBeanObservable {
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40 private final Object object;
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41 private bool updating = false;
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42
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43 private final PropertyDescriptor propertyDescriptor;
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44 private ListenerSupport listenerSupport;
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45
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46 private bool attachListeners;
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47
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48 /**
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49 * @param realm
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50 * @param object
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51 * @param descriptor
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52 */
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53 public this(Realm realm, Object object,
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54 PropertyDescriptor descriptor) {
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55 this(realm, object, descriptor, true);
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56 }
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57
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58 /**
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59 * @param realm
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60 * @param object
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61 * @param descriptor
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62 * @param attachListeners
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63 */
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64 public this(Realm realm, Object object,
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65 PropertyDescriptor descriptor, bool attachListeners) {
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66 super(realm);
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67 this.object = object;
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68 this.propertyDescriptor = descriptor;
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69 this.attachListeners = attachListeners;
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70 }
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71
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72 protected void firstListenerAdded() {
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73 if (!attachListeners) {
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74 return;
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75 }
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76
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77 PropertyChangeListener listener = new class() PropertyChangeListener {
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78 public void propertyChange(java.beans.PropertyChangeEvent.PropertyChangeEvent event) {
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79 if (!updating) {
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80 final ValueDiff diff = Diffs.createValueDiff(event.getOldValue(),
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81 event.getNewValue());
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82 getRealm().exec(new class() Runnable {
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83 public void run() {
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84 fireValueChange(diff);
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85 }});
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86 }
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87 }
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88 };
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89
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90 if (listenerSupport is null) {
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91 listenerSupport = new ListenerSupport(listener, propertyDescriptor.getName());
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92 }
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93
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94 listenerSupport.hookListener(object);
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95 }
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96
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97 public void doSetValue(Object value) {
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98 updating = true;
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99 try {
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100 Object oldValue = doGetValue();
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101
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102 if (Util.equals(oldValue, value)) {
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103 return;
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104 }
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105
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106 Method writeMethod = propertyDescriptor.getWriteMethod();
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107 if (!writeMethod.isAccessible()) {
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108 writeMethod.setAccessible(true);
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109 }
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110 writeMethod.invoke(object, [ value ]);
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111 fireValueChange(Diffs.createValueDiff(oldValue, doGetValue()));
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112 } catch (InvocationTargetException e) {
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113 /*
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114 * InvocationTargetException wraps any exception thrown by the
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115 * invoked method.
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116 */
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117 throw new RuntimeException(e.getCause());
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118 } catch (Exception e) {
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119 if (BeansObservables.DEBUG) {
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120 Policy
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121 .getLog()
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122 .log(
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123 new Status(
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124 IStatus.WARNING,
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125 Policy.JFACE_DATABINDING,
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126 IStatus.OK,
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127 Format("Could not change value of {}.{}", object, propertyDescriptor.getName()), e)); //$NON-NLS-1$ //$NON-NLS-2$
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128 }
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129 } finally {
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130 updating = false;
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131 }
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132 }
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133
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134 public Object doGetValue() {
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135 try {
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136 Method readMethod = propertyDescriptor.getReadMethod();
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137 if (readMethod is null) {
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138 throw new BindingException(propertyDescriptor.getName()
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139 ~ " property does not have a read method."); //$NON-NLS-1$
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140 }
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141 if (!readMethod.isAccessible()) {
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142 readMethod.setAccessible(true);
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143 }
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144 return readMethod.invoke(object, null);
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145 } catch (InvocationTargetException e) {
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146 /*
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147 * InvocationTargetException wraps any exception thrown by the
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148 * invoked method.
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149 */
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150 throw new RuntimeException(e.getCause());
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151 } catch (Exception e) {
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152 if (BeansObservables.DEBUG) {
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153 Policy
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154 .getLog()
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155 .log(
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156 new Status(
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157 IStatus.WARNING,
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158 Policy.JFACE_DATABINDING,
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159 IStatus.OK,
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160 Format("Could not read value of {}.{}", object, propertyDescriptor.getName()), e)); //$NON-NLS-1$ //$NON-NLS-2$
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161 }
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162 return null;
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163 }
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164 }
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165
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166 protected void lastListenerRemoved() {
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167 unhookListener();
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168 }
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169
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170 private void unhookListener() {
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171 if (listenerSupport !is null) {
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172 listenerSupport.dispose();
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173 listenerSupport = null;
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174 }
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175 }
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176
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177 public Object getValueType() {
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178 return propertyDescriptor.getPropertyType();
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179 }
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180
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181 public Object getObserved() {
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182 return object;
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183 }
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184
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185 public PropertyDescriptor getPropertyDescriptor() {
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186 return propertyDescriptor;
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187 }
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188
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189 public synchronized void dispose() {
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190 unhookListener();
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191 super.dispose();
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192 }
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193 }