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annotate org.eclipse.core.databinding.beans/src/org/eclipse/core/internal/databinding/beans/JavaBeanObservableMap.d @ 95:6208d4f6a277

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Added trees for databinding.beans and observable
author Frank Benoit <benoit@tionex.de>
date Tue, 21 Apr 2009 10:55:51 +0200
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children b74ac5dfcc06
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1 /*******************************************************************************
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2 * Copyright (c) 2006, 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 171616
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11 * Matthew hall - bug 223164
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12 *******************************************************************************/
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13
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14 package org.eclipse.core.internal.databinding.beans;
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15
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16 import java.beans.PropertyChangeListener;
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17 import java.beans.PropertyDescriptor;
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18 import java.lang.reflect.Method;
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19
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20 import org.eclipse.core.databinding.beans.IBeanObservable;
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21 import org.eclipse.core.databinding.observable.Diffs;
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22 import org.eclipse.core.databinding.observable.map.ComputedObservableMap;
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23 import org.eclipse.core.databinding.observable.set.IObservableSet;
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24 import org.eclipse.core.databinding.util.Policy;
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25 import org.eclipse.core.runtime.IStatus;
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26 import org.eclipse.core.runtime.Status;
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27
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28 /**
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29 * @since 1.0
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30 *
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31 */
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32 public class JavaBeanObservableMap : ComputedObservableMap ,
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33 IBeanObservable {
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34
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35 private PropertyDescriptor propertyDescriptor;
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36
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37 private PropertyChangeListener elementListener = new class() PropertyChangeListener {
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38 public void propertyChange(final java.beans.PropertyChangeEvent event) {
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39 if (!updating) {
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40 getRealm().exec(new class() Runnable {
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41 public void run() {
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42 fireMapChange(Diffs.createMapDiffSingleChange(
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43 event.getSource(), event.getOldValue(), event
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44 .getNewValue()));
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45 }
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46 });
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47 }
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48 }
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49 };
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50
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51 private ListenerSupport listenerSupport;
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52
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53 private bool updating = false;
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54
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55 private bool attachListeners;
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56
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57 /**
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58 * @param domain
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59 * @param propertyDescriptor
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60 */
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61 public this(IObservableSet domain,
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62 PropertyDescriptor propertyDescriptor) {
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63 this(domain, propertyDescriptor, true);
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64 }
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65
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66 /**
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67 * @param domain
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68 * @param propertyDescriptor
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69 * @param attachListeners
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70 */
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71 public this(IObservableSet domain,
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72 PropertyDescriptor propertyDescriptor, bool attachListeners) {
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73 super(domain);
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74
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75 this.propertyDescriptor = propertyDescriptor;
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76 this.attachListeners = attachListeners;
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77 if (attachListeners) {
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78 this.listenerSupport = new ListenerSupport(elementListener,
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79 propertyDescriptor.getName());
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80 }
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81 init();
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82 }
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83
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84 protected void hookListener(Object domainElement) {
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85 if (attachListeners && domainElement !is null) {
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86 listenerSupport.hookListener(domainElement);
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87 }
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88 }
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89
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90 protected void unhookListener(Object domainElement) {
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91 if (attachListeners && domainElement !is null) {
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92 listenerSupport.unhookListener(domainElement);
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93 }
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94 }
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95
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96 protected Object doGet(Object key) {
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97 if (key is null) {
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98 return null;
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99 }
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100 try {
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101 Method readMethod = propertyDescriptor.getReadMethod();
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102 if (!readMethod.isAccessible()) {
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103 readMethod.setAccessible(true);
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104 }
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105 return readMethod.invoke(key, new Object[0]);
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106 } catch (Exception e) {
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107 Policy.getLog().log(
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108 new Status(IStatus.ERROR, Policy.JFACE_DATABINDING,
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109 IStatus.ERROR, "cannot get value", e)); //$NON-NLS-1$
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110 throw new RuntimeException(e);
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111 }
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112 }
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113
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114 protected Object doPut(Object key, Object value) {
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115 try {
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116 Object oldValue = get(key);
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117 propertyDescriptor.getWriteMethod().invoke(key,
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118 new Object[] { value });
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119 keySet().add(key);
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120 return oldValue;
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121 } catch (Exception e) {
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122 Policy.getLog().log(
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123 new Status(IStatus.ERROR, Policy.JFACE_DATABINDING,
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124 IStatus.ERROR, "cannot set value", e)); //$NON-NLS-1$
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125 throw new RuntimeException(e);
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126 }
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127 }
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128
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129 /* (non-Javadoc)
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130 * @see org.eclipse.core.databinding.beans.IBeanObservable#getObserved()
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131 */
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132 public Object getObserved() {
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133 return keySet();
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134 }
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135
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136 /* (non-Javadoc)
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137 * @see org.eclipse.core.databinding.beans.IBeanObservable#getPropertyDescriptor()
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138 */
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139 public PropertyDescriptor getPropertyDescriptor() {
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140 return propertyDescriptor;
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141 }
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142 }