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annotate org.eclipse.core.databinding.observable/src/org/eclipse/core/internal/databinding/observable/tree/AbstractObservableTree.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, 2007 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 164134
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11 *******************************************************************************/
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12
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13 package org.eclipse.core.internal.databinding.observable.tree;
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14
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15 import org.eclipse.core.databinding.observable.AbstractObservable;
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16 import org.eclipse.core.databinding.observable.Realm;
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17 import org.eclipse.core.databinding.util.Policy;
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18 import org.eclipse.core.internal.databinding.BindingMessages;
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19 import org.eclipse.core.runtime.IStatus;
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20 import org.eclipse.core.runtime.ListenerList;
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21 import org.eclipse.core.runtime.Status;
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22
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23 /**
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24 * @since 3.3
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25 *
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26 */
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27 public abstract class AbstractObservableTree : AbstractObservable
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28 , IObservableTree {
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29
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30 private bool stale;
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31
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32 private ListenerList treeListeners = new ListenerListcast(ListenerList.IDENTITY);
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33
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34 /**
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35 * @param realm
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36 */
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37 public this(Realm realm) {
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38 super(realm);
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39 }
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40
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41 public void addChild(TreePath parentPath, Object childElement) {
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42 throw new UnsupportedOperationException();
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43 }
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44
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45 public void addTreeChangeListener(ITreeChangeListener listener) {
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46 treeListeners.add(listener);
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47 }
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48
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49 public int getChildCount(TreePath parentPath) {
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50 return getChildren(parentPath).length;
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51 }
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52
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53 public bool hasChildren(TreePath parentPath) {
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54 return getChildCount(parentPath) > 0;
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55 }
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56
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57 public void insertChild(TreePath parentPath, int index, Object childElement) {
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58 throw new UnsupportedOperationException();
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59 }
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60
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61 public bool isLazy() {
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62 return false;
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63 }
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64
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65 public bool isOrdered() {
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66 return false;
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67 }
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68
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69 public void removeChild(TreePath parentPath, Object childElement) {
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70 throw new UnsupportedOperationException();
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71 }
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72
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73 public void removeChild(TreePath parentPath, int index) {
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74 throw new UnsupportedOperationException();
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75 }
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76
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77 public void removeTreeChangeListener(ITreeChangeListener listener) {
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78 treeListeners.remove(listener);
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79 }
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80
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81 public void setChildCount(TreePath parentPath, int count) {
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82 throw new UnsupportedOperationException();
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83 }
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84
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85 public void setChildren(TreePath parentPath, Object[] children) {
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86 throw new UnsupportedOperationException();
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87 }
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88
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89 public void updateChildren(IChildrenUpdate update) {
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90 TreePath parent = update.getParent();
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91 Object[] children = getChildren(parent);
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92 for (int i = 0; i < update.getLength(); i++) {
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93 int targetIndex = update.getOffset() + i;
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94 if (targetIndex < children.length) {
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95 update.setChild(children[targetIndex], targetIndex);
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96 } else {
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97 update
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98 .setStatus(new Status(
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99 IStatus.WARNING,
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100 Policy.JFACE_DATABINDING,
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101 IStatus.OK,
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102 BindingMessages
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103 .getStringcast(BindingMessages.INDEX_OUT_OF_RANGE),
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104 null));
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105 }
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106 }
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107 update.done();
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108 }
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109
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110 public void updateChildrenCount(IChildrenCountUpdate update) {
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111 TreePath[] parents = update.getParents();
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112 for (int i = 0; i < parents.length; i++) {
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113 update.setChildCount(parents[i], getChildCount(parents[i]));
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114 }
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115 update.done();
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116 }
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117
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118 public void updateHasChildren(IHasChildrenUpdate update) {
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119 TreePath[] parents = update.getElements();
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120 for (int i = 0; i < parents.length; i++) {
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121 update.setHasChilren(parents[i], hasChildren(parents[i]));
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122 }
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123 update.done();
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124 }
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125
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126 public bool isStale() {
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127 return stale;
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128 }
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129
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130 /**
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131 * @param stale
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132 */
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133 public void setStale(bool stale) {
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134 this.stale = stale;
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135 if (stale) {
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136 fireStale();
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137 }
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138 }
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139
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140 protected void fireTreeChange(TreeDiff diff) {
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141 // fire general change event first
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142 fireChange();
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143
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144 Object[] listeners = treeListeners.getListeners();
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145 TreeChangeEvent event = new TreeChangeEvent(this, diff);
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146 for (int i = 0; i < listeners.length; i++) {
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147 (cast(ITreeChangeListener) listeners[i]).handleTreeChange(event);
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148 }
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149 }
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150
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151 }