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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 167204
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12 * Gautam Saggar - bug 169529
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13 * Brad Reynolds - bug 147515
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14 * Matthew Hall - bug 208858, 213145
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15 *******************************************************************************/
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16 module org.eclipse.core.databinding.observable.list.WritableList;
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81
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17 import org.eclipse.core.databinding.observable.list.ObservableList;
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18 import org.eclipse.core.databinding.observable.list.ListDiffEntry;
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78
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19
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20 import java.lang.all;
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21
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22 import java.util.ArrayList;
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23 import java.util.Collection;
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24 import java.util.Iterator;
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25 import java.util.List;
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26
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27 import org.eclipse.core.databinding.observable.Diffs;
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28 import org.eclipse.core.databinding.observable.Realm;
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29
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30 /**
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31 * Mutable observable list backed by an ArrayList.
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32 *
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33 * <p>
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34 * This class is thread safe. All state accessing methods must be invoked from
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35 * the {@link Realm#isCurrent() current realm}. Methods for adding and removing
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36 * listeners may be invoked from any thread.
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37 * </p>
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38 *
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39 * @since 1.0
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40 */
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41 public class WritableList : ObservableList {
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42
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43 /**
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44 * Creates an empty writable list in the default realm with a
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45 * <code>null</code> element type.
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46 *
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47 */
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48 public this() {
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49 this(Realm.getDefault());
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50 }
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51
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52 /**
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53 * Creates an empty writable list with a <code>null</code> element type.
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54 *
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55 * @param realm
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56 */
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57 public this(Realm realm) {
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58 this(realm, new ArrayList(), null);
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59 }
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60
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61 /**
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62 * Constructs a new instance with the default realm.
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63 *
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64 * @param toWrap
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65 * @param elementType
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66 * can be <code>null</code>
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67 */
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68 public this(List toWrap, Object elementType) {
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69 this(Realm.getDefault(), toWrap, elementType);
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70 }
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71
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72 /**
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73 * Creates a writable list containing elements of the given type, wrapping
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74 * an existing client-supplied list.
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75 *
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76 * @param realm
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77 * @param toWrap
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78 * The java.utilList to wrap
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79 * @param elementType
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80 * can be <code>null</code>
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81 */
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82 public this(Realm realm, List toWrap, Object elementType) {
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83 super(realm, toWrap, elementType);
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84 }
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85
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86 public Object set(int index, Object element) {
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87 checkRealm();
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88 Object oldElement = wrappedList.set(index, element);
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89 fireListChange(Diffs.createListDiff(Diffs.createListDiffEntry(index,
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90 false, oldElement), Diffs.createListDiffEntry(index, true,
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91 element)));
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92 return oldElement;
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93 }
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94
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95 /**
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96 * @since 1.1
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97 */
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98 public Object move(int oldIndex, int newIndex) {
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99 checkRealm();
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100 int size = wrappedList.size();
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101 if (oldIndex < 0 || oldIndex >= size)
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102 throw new IndexOutOfBoundsException(
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103 "oldIndex: " + oldIndex + ", size:" + size); //$NON-NLS-1$ //$NON-NLS-2$
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104 if (newIndex < 0 || newIndex >= size)
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105 throw new IndexOutOfBoundsException(
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106 "newIndex: " + newIndex + ", size:" + size); //$NON-NLS-1$ //$NON-NLS-2$
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107 if (oldIndex is newIndex)
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108 return wrappedList.get(oldIndex);
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109 Object element = wrappedList.remove(oldIndex);
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110 wrappedList.add(newIndex, element);
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111 fireListChange(Diffs.createListDiff(Diffs.createListDiffEntry(oldIndex,
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112 false, element), Diffs.createListDiffEntry(newIndex, true,
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113 element)));
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114 return element;
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115 }
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116
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117 public Object remove(int index) {
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118 checkRealm();
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119 Object oldElement = wrappedList.remove(index);
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120 fireListChange(Diffs.createListDiff(Diffs.createListDiffEntry(index,
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121 false, oldElement)));
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122 return oldElement;
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123 }
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124
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125 public bool add(Object element) {
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126 checkRealm();
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127 bool added = wrappedList.add(element);
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128 if (added) {
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129 fireListChange(Diffs.createListDiff(Diffs.createListDiffEntry(
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130 wrappedList.size() - 1, true, element)));
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131 }
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132 return added;
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133 }
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134
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135 public void add(int index, Object element) {
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136 checkRealm();
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137 wrappedList.add(index, element);
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138 fireListChange(Diffs.createListDiff(Diffs.createListDiffEntry(index,
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139 true, element)));
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140 }
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141
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142 public bool addAll(Collection c) {
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143 checkRealm();
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144 ListDiffEntry[] entries = new ListDiffEntry[c.size()];
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145 int i = 0;
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146 int addIndex = wrappedList.size();
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147 for (Iterator it = c.iterator(); it.hasNext();) {
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148 Object element = it.next();
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149 entries[i++] = Diffs.createListDiffEntry(addIndex++, true, element);
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150 }
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151 bool added = wrappedList.addAll(c);
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152 fireListChange(Diffs.createListDiff(entries));
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153 return added;
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154 }
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155
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156 public bool addAll(int index, Collection c) {
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157 checkRealm();
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158 ListDiffEntry[] entries = new ListDiffEntry[c.size()];
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159 int i = 0;
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160 int addIndex = index;
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161 for (Iterator it = c.iterator(); it.hasNext();) {
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162 Object element = it.next();
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163 entries[i++] = Diffs.createListDiffEntry(addIndex++, true, element);
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164 }
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165 bool added = wrappedList.addAll(index, c);
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166 fireListChange(Diffs.createListDiff(entries));
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167 return added;
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168 }
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169
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170 public bool remove(Object o) {
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171 checkRealm();
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172 int index = wrappedList.indexOf(o);
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173 if (index is -1) {
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174 return false;
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175 }
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176 wrappedList.remove(index);
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177 fireListChange(Diffs.createListDiff(Diffs.createListDiffEntry(index,
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178 false, o)));
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179 return true;
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180 }
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181
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182 public bool removeAll(Collection c) {
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183 checkRealm();
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184 List entries = new ArrayList();
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185 for (Iterator it = c.iterator(); it.hasNext();) {
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186 Object element = it.next();
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187 int removeIndex = wrappedList.indexOf(element);
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188 if (removeIndex !is -1) {
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189 wrappedList.remove(removeIndex);
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190 entries.add(Diffs.createListDiffEntry(removeIndex, false,
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191 element));
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192 }
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193 }
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194 if (entries.size() > 0)
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195 fireListChange(Diffs.createListDiff(cast(ListDiffEntry[]) entries
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196 .toArray(new ListDiffEntry[entries.size()])));
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197 return entries.size() > 0;
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198 }
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199
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200 public bool retainAll(Collection c) {
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201 checkRealm();
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202 List entries = new ArrayList();
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203 int removeIndex = 0;
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204 for (Iterator it = wrappedList.iterator(); it.hasNext();) {
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205 Object element = it.next();
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206 if (!c.contains(element)) {
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207 entries.add(Diffs.createListDiffEntry(removeIndex, false,
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208 element));
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209 it.remove();
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210 } else {
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211 // only increment if we haven't removed the current element
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212 removeIndex++;
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213 }
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214 }
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215 if (entries.size() > 0)
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216 fireListChange(Diffs.createListDiff(cast(ListDiffEntry[]) entries
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217 .toArray(new ListDiffEntry[entries.size()])));
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218 return entries.size() > 0;
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219 }
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220
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221 public void clear() {
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222 checkRealm();
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223 List entries = new ArrayList();
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224 for (Iterator it = wrappedList.iterator(); it.hasNext();) {
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225 Object element = it.next();
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226 // always report 0 as the remove index
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227 entries.add(Diffs.createListDiffEntry(0, false, element));
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228 it.remove();
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229 }
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230 fireListChange(Diffs.createListDiff(cast(ListDiffEntry[]) entries
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231 .toArray(new ListDiffEntry[entries.size()])));
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232 }
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233
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234 /**
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235 * @param elementType
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236 * can be <code>null</code>
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237 * @return new list with the default realm.
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238 */
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239 public static WritableList withElementType(Object elementType) {
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240 return new WritableList(Realm.getDefault(), new ArrayList(),
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241 elementType);
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242 }
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243 }
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