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annotate org.eclipse.core.databinding.observable/src/org/eclipse/core/internal/databinding/observable/ValidatedObservableValue.d @ 96:b74ac5dfcc06

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package to module and java.lang.all import
author Frank Benoit <benoit@tionex.de>
date Tue, 21 Apr 2009 11:03:33 +0200
parents 6208d4f6a277
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1 /*******************************************************************************
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2 * Copyright (c) 2008 Matthew Hall 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 * Matthew Hall - initial API and implementation (bug 218269)
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10 ******************************************************************************/
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11
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12 module org.eclipse.core.internal.databinding.observable.ValidatedObservableValue;
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13
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14 import java.lang.all;
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15
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16 import org.eclipse.core.databinding.observable.Diffs;
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17 import org.eclipse.core.databinding.observable.IStaleListener;
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18 import org.eclipse.core.databinding.observable.ObservableTracker;
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19 import org.eclipse.core.databinding.observable.StaleEvent;
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20 import org.eclipse.core.databinding.observable.value.AbstractObservableValue;
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21 import org.eclipse.core.databinding.observable.value.IObservableValue;
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22 import org.eclipse.core.databinding.observable.value.IValueChangeListener;
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23 import org.eclipse.core.databinding.observable.value.IVetoableValue;
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24 import org.eclipse.core.databinding.observable.value.ValueChangeEvent;
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25 import org.eclipse.core.databinding.observable.value.ValueChangingEvent;
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26 import org.eclipse.core.internal.databinding.Util;
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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
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30 /**
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31 * An {@link IObservableValue} wrapper that stays in sync with the target
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32 * observable as long as a given validation status is valid.
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33 * <ul>
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34 * <li>While status is valid, ValidatedObservableValue stays in sync with its
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35 * target.
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36 * <li>When status becomes invalid, ValidatedObservableValue will retain the
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37 * last valid value of its target.
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38 * <li>While status is invalid, changes in the target observable cause
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39 * ValidatedObservableValue to fire a stale event, to indicate that changes are
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40 * pending.
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41 * <li>When status becomes valid, pending value changes are performed (if any)
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42 * and synchronization resumes.
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43 * </ul>
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44 * <p>
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45 * Note:
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46 * <ul>
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47 * <li>By default, a status is valid if its
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48 * {@link IStatus#getSeverity() severity} is {@link IStatus#OK OK},
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49 * {@link IStatus#INFO INFO}, or {@link IStatus#WARNING WARNING}
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50 * <li>Calls to {@link #setValuecast(Object)} on the validated observable changes
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51 * the value regardless of the validation status.
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52 * <li>This class will not forward {@link ValueChangingEvent} events from a
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53 * wrapped {@link IVetoableValue}.
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54 * </ul>
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55 *
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56 * @since 1.2
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57 */
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58 public class ValidatedObservableValue : AbstractObservableValue {
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59 private IObservableValue target;
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60 private IObservableValue validationStatus;
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61
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62 private Object cachedValue;
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63 private bool stale;
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64 private bool updatingTarget = false;
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65
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66 private IValueChangeListener targetChangeListener = new class() IValueChangeListener {
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67 public void handleValueChange(ValueChangeEvent event) {
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68 if (updatingTarget)
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69 return;
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70 IStatus status = cast(IStatus) validationStatus.getValue();
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71 if (isValid(status))
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72 internalSetValue(event.diff.getNewValue(), false);
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73 else
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74 makeStale();
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75 }
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76 };
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77
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78 private static bool isValid(IStatus status) {
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79 return status.isOK() || status.matches(IStatus.INFO | IStatus.WARNING);
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80 }
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81
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82 private IStaleListener targetStaleListener = new class() IStaleListener {
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83 public void handleStale(StaleEvent staleEvent) {
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84 fireStale();
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85 }
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86 };
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87
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88 private IValueChangeListener validationStatusChangeListener = new class() IValueChangeListener {
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89 public void handleValueChange(ValueChangeEvent event) {
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90 IStatus oldStatus = cast(IStatus) event.diff.getOldValue();
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91 IStatus newStatus = cast(IStatus) event.diff.getNewValue();
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92 if (stale && !isValid(oldStatus) && isValid(newStatus)) {
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93 internalSetValue(target.getValue(), false);
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94 }
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95 }
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96 };
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97
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98 /**
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99 * Constructs an observable value
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100 *
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101 * @param target
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102 * the observable value to be wrapped
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103 * @param validationStatus
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104 * an observable value of type {@link IStatus}.class which
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105 * contains the current validation status
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106 */
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107 public this(IObservableValue target,
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108 IObservableValue validationStatus) {
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109 super(target.getRealm());
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110 Assert.isNotNull(validationStatus,
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111 "Validation status observable cannot be null"); //$NON-NLS-1$
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112 Assert
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113 .isTrue(target.getRealm().equals(validationStatus.getRealm()),
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114 "Target and validation status observables must be on the same realm"); //$NON-NLS-1$
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115 this.target = target;
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116 this.validationStatus = validationStatus;
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117 this.cachedValue = target.getValue();
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118
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119 target.addValueChangeListener(targetChangeListener);
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120 target.addStaleListener(targetStaleListener);
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121 validationStatus.addValueChangeListener(validationStatusChangeListener);
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122 }
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123
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124 private void makeStale() {
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125 if (!stale) {
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126 stale = true;
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127 fireStale();
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128 }
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129 }
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130
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131 public bool isStale() {
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132 ObservableTracker.getterCalled(this);
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133 return stale || target.isStale();
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134 }
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135
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136 protected Object doGetValue() {
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137 return cachedValue;
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138 }
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139
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140 private void internalSetValue(Object value, bool updateTarget) {
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141 Object oldValue = cachedValue;
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142 cachedValue = value;
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143 if (updateTarget) {
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144 updatingTarget = true;
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145 try {
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146 target.setValue(value);
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147 cachedValue = target.getValue();
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148 } finally {
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149 updatingTarget = false;
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150 }
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151 }
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152 stale = false;
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153 if (!Util.equals(oldValue, cachedValue))
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154 fireValueChange(Diffs.createValueDiff(oldValue, cachedValue));
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155 }
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156
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157 protected void doSetValue(Object value) {
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158 internalSetValue(value, true);
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159 }
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160
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161 public Object getValueType() {
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162 return target.getValueType();
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163 }
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164
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165 public synchronized void dispose() {
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166 target.removeValueChangeListener(targetChangeListener);
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167 target.removeStaleListener(targetStaleListener);
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168 validationStatus
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169 .removeValueChangeListener(validationStatusChangeListener);
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170 super.dispose();
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171 }
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172 }