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annotate org.eclipse.core.databinding.observable/src/org/eclipse/core/databinding/observable/Observables.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
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1 /*******************************************************************************
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2 * Copyright (c) 2006-2008 Cerner 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 * Brad Reynolds - initial API and implementation
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10 * Matt Carter - bug 212518 (constantObservableValue)
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11 * Matthew Hall - bugs 208332, 212518, 219909, 184830
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12 * Marko Topolnik - bug 184830
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13 ******************************************************************************/
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14
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15 module org.eclipse.core.databinding.observable.Observables;
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16 import org.eclipse.core.databinding.observable.IChangeListener;
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17 import org.eclipse.core.databinding.observable.Realm;
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18 import org.eclipse.core.databinding.observable.IStaleListener;
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19 import org.eclipse.core.databinding.observable.IObservable;
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20
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21 import java.lang.all;
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22
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23 import java.util.List;
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24 import java.util.Set;
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25
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26 import org.eclipse.core.databinding.observable.list.IListChangeListener;
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27 import org.eclipse.core.databinding.observable.list.IObservableList;
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28 import org.eclipse.core.databinding.observable.list.ObservableList;
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29 import org.eclipse.core.databinding.observable.map.IObservableMap;
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30 import org.eclipse.core.databinding.observable.masterdetail.IObservableFactory;
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31 import org.eclipse.core.databinding.observable.masterdetail.MasterDetailObservables;
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32 import org.eclipse.core.databinding.observable.set.IObservableSet;
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33 import org.eclipse.core.databinding.observable.set.ISetChangeListener;
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34 import org.eclipse.core.databinding.observable.set.ObservableSet;
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35 import org.eclipse.core.databinding.observable.value.IObservableValue;
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36 import org.eclipse.core.internal.databinding.observable.ConstantObservableValue;
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37 import org.eclipse.core.internal.databinding.observable.EmptyObservableList;
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38 import org.eclipse.core.internal.databinding.observable.EmptyObservableSet;
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39 import org.eclipse.core.internal.databinding.observable.MapEntryObservableValue;
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40 import org.eclipse.core.internal.databinding.observable.ProxyObservableList;
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41 import org.eclipse.core.internal.databinding.observable.ProxyObservableSet;
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42 import org.eclipse.core.internal.databinding.observable.StalenessObservableValue;
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43 import org.eclipse.core.internal.databinding.observable.UnmodifiableObservableList;
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44 import org.eclipse.core.internal.databinding.observable.UnmodifiableObservableSet;
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45 import org.eclipse.core.internal.databinding.observable.UnmodifiableObservableValue;
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46 import org.eclipse.core.runtime.Assert;
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47
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48 /**
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49 * Contains static methods to operate on or return
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50 * {@link IObservable Observables}.
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51 *
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52 * @since 1.0
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53 */
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54 public class Observables {
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55 /**
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56 * Returns an unmodifiable observable value backed by the given observable
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57 * value.
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58 *
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59 * @param value
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60 * the value to wrap in an unmodifiable value
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61 * @return an unmodifiable observable value backed by the given observable
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62 * value
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63 * @since 1.1
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64 */
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65 public static IObservableValue unmodifiableObservableValue(
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66 IObservableValue value) {
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67 Assert.isNotNull(value, "Argument 'value' cannot be null"); //$NON-NLS-1$
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68 return new UnmodifiableObservableValue(value);
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69 }
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70
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71 /**
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72 * Returns an observable value with the given constant value.
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73 *
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74 * @param realm
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75 * the observable's realm
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76 * @param value
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77 * the observable's constant value
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78 * @param valueType
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79 * the observable's value type
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80 * @return an immutable observable value with the given constant value
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81 * @since 1.1
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82 */
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83 public static IObservableValue constantObservableValue(Realm realm,
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84 Object value, Object valueType) {
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85 return new ConstantObservableValue(realm, value, valueType);
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86 }
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87
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88 /**
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89 * Returns an observable value with the given constant value.
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90 *
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91 * @param realm
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92 * the observable's realm
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93 * @param value
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94 * the observable's constant value
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95 * @return an immutable observable value with the given constant value
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96 * @since 1.1
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97 */
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98 public static IObservableValue constantObservableValue(Realm realm,
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99 Object value) {
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100 return constantObservableValue(realm, value, null);
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101 }
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102
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103 /**
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104 * Returns an observable value with the given constant value.
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105 *
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106 * @param value
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107 * the observable's constant value
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108 * @param valueType
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109 * the observable's value type
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110 * @return an immutable observable value with the given constant value
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111 * @since 1.1
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112 */
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113 public static IObservableValue constantObservableValue(Object value,
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114 Object valueType) {
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115 return constantObservableValue(Realm.getDefault(), value, valueType);
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116 }
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117
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118 /**
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119 * Returns an observable value with the given constant value.
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120 *
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121 * @param value
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122 * the observable's constant value
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123 * @return an immutable observable value with the given constant value
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124 * @since 1.1
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125 */
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126 public static IObservableValue constantObservableValue(Object value) {
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127 return constantObservableValue(Realm.getDefault(), value, null);
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128 }
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129
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130 /**
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131 * Returns an unmodifiable observable list backed by the given observable
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132 * list.
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133 *
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134 * @param list
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135 * the list to wrap in an unmodifiable list
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136 * @return an unmodifiable observable list backed by the given observable
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137 * list
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138 */
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139 public static IObservableList unmodifiableObservableList(
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140 IObservableList list) {
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141 if (list is null) {
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142 throw new IllegalArgumentException("List parameter cannot be null."); //$NON-NLS-1$
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143 }
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144
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145 return new UnmodifiableObservableList(list);
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146 }
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147
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148 /**
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149 * Returns an unmodifiable observable set backed by the given observable
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150 * set.
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151 *
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152 * @param set
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153 * the set to wrap in an unmodifiable set
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154 * @return an unmodifiable observable set backed by the given observable set
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155 * @since 1.1
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156 */
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157 public static IObservableSet unmodifiableObservableSet(IObservableSet set) {
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158 if (set is null) {
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159 throw new IllegalArgumentException("Set parameter cannot be null"); //$NON-NLS-1$
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160 }
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161
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162 return new UnmodifiableObservableSet(set);
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163 }
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164
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165 /**
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166 * Returns an empty observable list. The returned list continues to work
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167 * after it has been disposed of and can be disposed of multiple times.
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168 *
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169 * @return an empty observable list.
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170 */
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171 public static IObservableList emptyObservableList() {
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172 return emptyObservableList(Realm.getDefault(), null);
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173 }
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174
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175 /**
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176 * Returns an empty observable list of the given element type. The returned
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177 * list continues to work after it has been disposed of and can be disposed
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178 * of multiple times.
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179 *
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180 * @param elementType
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181 * the element type of the returned list
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182 * @return an empty observable list
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183 * @since 1.1
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184 */
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185 public static IObservableList emptyObservableList(Object elementType) {
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186 return emptyObservableList(Realm.getDefault(), elementType);
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187 }
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188
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189 /**
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190 * Returns an empty observable list belonging to the given realm. The
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191 * returned list continues to work after it has been disposed of and can be
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192 * disposed of multiple times.
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193 *
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194 * @param realm
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195 * the realm of the returned list
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196 * @return an empty observable list.
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197 */
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198 public static IObservableList emptyObservableList(Realm realm) {
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199 return emptyObservableList(realm, null);
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200 }
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201
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202 /**
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203 * Returns an empty observable list of the given element type and belonging
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204 * to the given realm. The returned list continues to work after it has been
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205 * disposed of and can be disposed of multiple times.
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206 *
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207 * @param realm
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208 * the realm of the returned list
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209 * @param elementType
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210 * the element type of the returned list
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211 * @return an empty observable list
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212 * @since 1.1
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213 */
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214 public static IObservableList emptyObservableList(Realm realm,
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215 Object elementType) {
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216 return new EmptyObservableList(realm, elementType);
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217 }
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218
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219 /**
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220 * Returns an empty observable set. The returned set continues to work after
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221 * it has been disposed of and can be disposed of multiple times.
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222 *
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223 * @return an empty observable set.
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224 */
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225 public static IObservableSet emptyObservableSet() {
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226 return emptyObservableSet(Realm.getDefault(), null);
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227 }
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228
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229 /**
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230 * Returns an empty observable set of the given element type. The returned
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231 * set continues to work after it has been disposed of and can be disposed
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232 * of multiple times.
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233 *
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234 * @param elementType
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235 * the element type of the returned set
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236 * @return an empty observable set
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237 * @since 1.1
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238 */
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239 public static IObservableSet emptyObservableSet(Object elementType) {
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240 return emptyObservableSet(Realm.getDefault(), elementType);
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241 }
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242
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243 /**
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244 * Returns an empty observable set belonging to the given realm. The
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245 * returned set continues to work after it has been disposed of and can be
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246 * disposed of multiple times.
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247 *
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248 * @param realm
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249 * the realm of the returned set
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250 * @return an empty observable set.
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251 */
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252 public static IObservableSet emptyObservableSet(Realm realm) {
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253 return emptyObservableSet(realm, null);
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254 }
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255
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256 /**
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257 * Returns an empty observable set of the given element type and belonging
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258 * to the given realm. The returned set continues to work after it has been
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259 * disposed of and can be disposed of multiple times.
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260 *
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261 * @param realm
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262 * the realm of the returned set
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263 * @param elementType
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264 * the element type of the returned set
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265 * @return an empty observable set
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266 * @since 1.1
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267 */
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268 public static IObservableSet emptyObservableSet(Realm realm,
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269 Object elementType) {
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270 return new EmptyObservableSet(realm, elementType);
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271 }
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272
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273 /**
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274 * Returns an observable set backed by the given set.
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275 *
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276 * @param set
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277 * the set to wrap in an IObservableSet
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278 * @return an observable set backed by the given set
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279 */
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280 public static IObservableSet staticObservableSet(Set set) {
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281 return staticObservableSet(Realm.getDefault(), set, Object.class);
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282 }
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283
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284 /**
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285 * Returns an observable set of the given element type, backed by the given
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286 * set.
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287 *
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288 * @param set
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289 * the set to wrap in an IObservableSet
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290 * @param elementType
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291 * the element type of the returned set
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292 * @return Returns an observable set backed by the given unchanging set
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293 * @since 1.1
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294 */
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295 public static IObservableSet staticObservableSet(Set set, Object elementType) {
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296 return staticObservableSet(Realm.getDefault(), set, elementType);
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297 }
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298
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299 /**
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300 * Returns an observable set belonging to the given realm, backed by the
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301 * given set.
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302 *
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303 * @param realm
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304 * the realm of the returned set
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305 * @param set
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306 * the set to wrap in an IObservableSet
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307 * @return an observable set backed by the given unchanging set
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308 */
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309 public static IObservableSet staticObservableSet(Realm realm, Set set) {
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310 return staticObservableSet(realm, set, Object.class);
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311 }
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312
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313 /**
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314 * Returns an observable set of the given element type and belonging to the
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315 * given realm, backed by the given set.
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316 *
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317 * @param realm
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318 * the realm of the returned set
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319 * @param set
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320 * the set to wrap in an IObservableSet
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321 * @param elementType
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322 * the element type of the returned set
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323 * @return an observable set backed by the given set
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324 * @since 1.1
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325 */
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326 public static IObservableSet staticObservableSet(Realm realm, Set set,
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327 Object elementType) {
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328 return new class(realm, set, elementType) ObservableSet {
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329 public void addChangeListener(IChangeListener listener) {
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330 }
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331
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332 public void addStaleListener(IStaleListener listener) {
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333 }
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334
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335 public void addSetChangeListener(ISetChangeListener listener) {
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336 }
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337 };
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338 }
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339
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340 /**
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341 * Returns an observable set that contains the same elements as the given
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342 * set, and fires the same events as the given set, but can be disposed of
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343 * without disposing of the wrapped set.
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344 *
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345 * @param target
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346 * the set to wrap
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347 * @return a disposable proxy for the given observable set
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348 */
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349 public static IObservableSet proxyObservableSet(IObservableSet target) {
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350 return new ProxyObservableSet(target);
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351 }
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352
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353 /**
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354 * Returns an observable list that contains the same elements as the given
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355 * list, and fires the same events as the given list, but can be disposed of
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356 * without disposing of the wrapped list.
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357 *
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358 * @param target
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359 * the list to wrap
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360 * @return a disposable proxy for the given observable list
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361 * @since 1.1
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362 */
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363 public static IObservableList proxyObservableList(IObservableList target) {
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364 return new ProxyObservableList(target);
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365 }
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366
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367 /**
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368 * Returns an observable list backed by the given list.
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369 *
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370 * @param list
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371 * the list to wrap in an IObservableList
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372 * @return an observable list backed by the given unchanging list
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373 */
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374 public static IObservableList staticObservableList(List list) {
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375 return staticObservableList(Realm.getDefault(), list, Object.class);
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376 }
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377
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378 /**
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379 * Returns an observable list of the given element type, backed by the given
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380 * list.
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381 *
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382 * @param list
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383 * the list to wrap in an IObservableList
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384 * @param elementType
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385 * the element type of the returned list
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386 * @return an observable list backed by the given unchanging list
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387 * @since 1.1
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388 */
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389 public static IObservableList staticObservableList(List list,
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390 Object elementType) {
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391 return staticObservableList(Realm.getDefault(), list, elementType);
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392 }
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393
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394 /**
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395 * Returns an observable list belonging to the given realm, backed by the
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396 * given list.
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397 *
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398 * @param realm
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399 * the realm of the returned list
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400 * @param list
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401 * the list to wrap in an IObservableList
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402 * @return an observable list backed by the given unchanging list
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403 */
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404 public static IObservableList staticObservableList(Realm realm, List list) {
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405 return staticObservableList(realm, list, Object.class);
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406 }
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407
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408 /**
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409 * Returns an observable list of the given element type and belonging to the
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410 * given realm, backed by the given list.
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411 *
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412 * @param realm
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413 * the realm of the returned list
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414 * @param list
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415 * the list to wrap in an IObservableList
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416 * @param elementType
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417 * the element type of the returned list
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418 * @return an observable list backed by the given unchanging list
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419 * @since 1.1
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420 */
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421 public static IObservableList staticObservableList(Realm realm, List list,
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422 Object elementType) {
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423 return new class(realm, list, elementType) ObservableList {
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424 public void addChangeListener(IChangeListener listener) {
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425 }
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426
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427 public void addStaleListener(IStaleListener listener) {
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428 }
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429
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430 public void addListChangeListener(IListChangeListener listener) {
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431 }
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432 };
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433 }
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434
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435 /**
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436 * Returns an observable value of type <code>Boolean.TYPE</code> which
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437 * tracks whether the given observable is stale.
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438 *
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439 * @param observable
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440 * the observable to track
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441 * @return an observable value which tracks whether the given observable is
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442 * stale
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443 *
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444 * @since 1.1
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445 */
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446 public static IObservableValue observeStale(IObservable observable) {
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447 return new StalenessObservableValue(observable);
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448 }
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449
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450 /**
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451 * Returns an observable value that tracks changes to the value of an
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452 * observable map's entry specified by its key.
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453 * <p>
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454 * The state where the key does not exist in the map is equivalent to the
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455 * state where the key exists and its value is <code>null</code>. The
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456 * transition between these two states is not considered a value change and
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457 * no event is fired.
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458 *
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459 * @param map
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460 * the observable map whose entry will be tracked.
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461 * @param key
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462 * the key identifying the map entry to track.
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463 * @param valueType
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464 * the type of the value. May be <code>null</code>, meaning
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465 * the value is untyped.
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466 * @return an observable value that tracks the value associated with the
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467 * specified key in the given map
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468 * @since 1.1
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469 */
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470 public static IObservableValue observeMapEntry(IObservableMap map,
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471 Object key, Object valueType) {
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472 return new MapEntryObservableValue(map, key, valueType);
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473 }
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474
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475 /**
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476 * Returns a factory for creating obervable values tracking the value of the
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477 * {@link IObservableMap observable map} entry identified by a particular
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478 * key.
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479 *
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480 * @param map
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481 * the observable map whose entry will be tracked.
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482 * @param valueType
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483 * the type of the value. May be <code>null</code>, meaning
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484 * the value is untyped.
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485 * @return a factory for creating observable values tracking the value of
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486 * the observable map entry identified by a particular key object.
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487 * @since 1.1
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488 */
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489 public static IObservableFactory mapEntryValueFactory(
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490 final IObservableMap map, final Object valueType) {
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491 return new class() IObservableFactory {
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492 public IObservable createObservable(Object key) {
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493 return observeMapEntry(map, key, valueType);
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494 }
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495 };
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496 }
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497
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498 /**
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499 * Helper method for <code>MasterDetailObservables.detailValue(master,
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500 * mapEntryValueFactory(map, valueType), valueType)</code>.
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501 *
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502 * @param map
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503 * the observable map whose entry will be tracked.
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504 * @param master
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505 * the observable value that identifies which map entry to track.
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506 * @param valueType
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507 * the type of the value. May be <code>null</code>, meaning
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508 * the value is untyped.
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509 * @return an observable value tracking the current value of the specified
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510 * key in the given map an observable value that tracks the current
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511 * value of the named property for the current value of the master
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512 * observable value
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513 * @since 1.1
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514 */
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515 public static IObservableValue observeDetailMapEntry(IObservableMap map,
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516 IObservableValue master, Object valueType) {
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517 return MasterDetailObservables.detailValue(master,
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518 mapEntryValueFactory(map, valueType), valueType);
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519 }
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520 }