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annotate org.eclipse.jface/src/org/eclipse/jface/viewers/StructuredSelection.d @ 12:bc29606a740c

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Added dwt-addons in original directory structure of eclipse.org
author Frank Benoit <benoit@tionex.de>
date Sat, 14 Mar 2009 18:23:29 +0100
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1 /*******************************************************************************
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2 * Copyright (c) 2000, 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 * Port to the D programming language:
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11 * Frank Benoit <benoit@tionex.de>
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12 *******************************************************************************/
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13 module org.eclipse.jface.viewers.StructuredSelection;
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15 import org.eclipse.jface.viewers.IStructuredSelection;
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16 import org.eclipse.jface.viewers.IElementComparer;
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19 import org.eclipse.core.runtime.Assert;
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20 import org.eclipse.jface.resource.JFaceResources;
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21
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22 import java.lang.all;
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23 import java.util.Arrays;
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24 import java.util.List;
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25 import java.util.Iterator;
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26
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27 /**
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28 * A concrete implementation of the <code>IStructuredSelection</code> interface,
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29 * suitable for instantiating.
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30 * <p>
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31 * This class is not intended to be subclassed.
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32 * </p>
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33 * @noextend This class is not intended to be subclassed by clients.
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34 */
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35 public class StructuredSelection : IStructuredSelection {
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36
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37 /**
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38 * The element that make up this structured selection.
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39 */
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40 private Object[] elements;
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41
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42 /**
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43 * The element comparer, or <code>null</code>
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44 */
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45 private IElementComparer comparer;
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46
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47 /**
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48 * The canonical empty selection. This selection should be used instead of
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49 * <code>null</code>.
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50 */
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51 public static const StructuredSelection EMPTY;
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52 static this(){
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53 EMPTY = new StructuredSelection();
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54 }
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55 /**
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56 * Creates a new empty selection.
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57 * See also the static field <code>EMPTY</code> which contains an empty selection singleton.
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58 *
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59 * @see #EMPTY
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60 */
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61 public this() {
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62 }
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63
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64 /**
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65 * Creates a structured selection from the given elements.
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66 *
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67 * @param elements an array of elements
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68 */
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69 public this(Object[] elements) {
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70 this.elements = new Object[elements.length];
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71 System.arraycopy(elements, 0, this.elements, 0, elements.length);
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72 }
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73
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74 /**
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75 * Creates a structured selection containing a single object.
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76 * The object must not be <code>null</code>.
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77 *
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78 * @param element the element
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79 */
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80 public this(Object element) {
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81 Assert.isNotNull(element);
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82 elements = [ element ];
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83 }
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84
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85 /**
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86 * Creates a structured selection from the given <code>List</code>.
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87 * @param elements list of selected elements
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88 */
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89 public this(List elements) {
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90 this(elements, null);
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91 }
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92
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93 /**
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94 * Creates a structured selection from the given <code>List</code> and
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95 * element comparer. If an element comparer is provided, it will be used to
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96 * determine equality between structured selection objects provided that
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97 * they both are based on the same (identical) comparer. See bug
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98 *
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99 * @param elements
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100 * list of selected elements
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101 * @param comparer
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102 * the comparer, or null
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103 * @since 3.4
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104 */
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105 public this(List elements, IElementComparer comparer) {
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106 Assert.isNotNull(cast(Object)elements);
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107 this.elements = elements.toArray();
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108 this.comparer = comparer;
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109 }
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110
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111 /**
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112 * Returns whether this structured selection is equal to the given object.
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113 * Two structured selections are equal if they contain the same elements
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114 * in the same order.
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115 *
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116 * @param o the other object
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117 * @return <code>true</code> if they are equal, and <code>false</code> otherwise
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118 */
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119 public override int opEquals(Object o) {
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120 if (this is o) {
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121 return true;
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122 }
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123 //null and other classes
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124 if (!(cast(StructuredSelection)o )) {
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125 return false;
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126 }
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127 StructuredSelection s2 = cast(StructuredSelection) o;
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128
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129 // either or both empty?
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130 if (isEmpty()) {
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131 return s2.isEmpty();
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132 }
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133 if (s2.isEmpty()) {
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134 return false;
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135 }
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136
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137 bool useComparer = comparer !is null && comparer is s2.comparer;
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138
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139 //size
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140 int myLen = elements.length;
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141 if (myLen !is s2.elements.length) {
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142 return false;
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143 }
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144 //element comparison
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145 for (int i = 0; i < myLen; i++) {
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146 if (useComparer) {
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147 if (!comparer.opEquals(elements[i], s2.elements[i])) {
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148 return false;
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149 }
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150 } else {
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151 if (!elements[i].opEquals(s2.elements[i])) {
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152 return false;
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153 }
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154 }
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155 }
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156 return true;
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157 }
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158
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159 /* (non-Javadoc)
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160 * Method declared in IStructuredSelection.
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161 */
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162 public Object getFirstElement() {
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163 return isEmpty() ? null : elements[0];
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164 }
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165
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166 /* (non-Javadoc)
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167 * Method declared in ISelection.
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168 */
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169 public bool isEmpty() {
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170 return elements is null || elements.length is 0;
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171 }
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172
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173 /* (non-Javadoc)
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174 * Method declared in IStructuredSelection.
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175 */
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176 public Iterator iterator() {
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177 return Arrays.asList(elements is null ? null : elements)
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178 .iterator();
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179 }
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180
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181 /* (non-Javadoc)
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182 * Method declared in IStructuredSelection.
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183 */
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184 public int size() {
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185 return elements is null ? 0 : elements.length;
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186 }
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187
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188 /* (non-Javadoc)
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189 * Method declared in IStructuredSelection.
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190 */
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191 public Object[] toArray() {
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192 return elements is null ? new Object[0] : elements.dup;
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193 }
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194
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195 /* (non-Javadoc)
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196 * Method declared in IStructuredSelection.
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197 */
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198 public List toList() {
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199 return Arrays.asList(elements is null ? null : elements);
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200 }
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201
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202 /**
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203 * Internal method which returns a string representation of this
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204 * selection suitable for debug purposes only.
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205 *
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206 * @return debug string
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207 */
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208 public override String toString() {
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209 return isEmpty() ? JFaceResources.getString("<empty_selection>") : (cast(Object)toList()).toString(); //$NON-NLS-1$
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210 }
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211 }