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1 /*******************************************************************************
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2 * Copyright (c) 2006 The Pampered Chef 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 * The Pampered Chef - initial API and implementation
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10 ******************************************************************************/
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11
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12 module org.eclipse.core.internal.databinding.RandomAccessListIterator;
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13
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14 import java.lang.all;
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15
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16 import java.util.List;
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17 import java.util.ListIterator;
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18
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19 /**
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20 * Class RandomAccessListIterator. A ListIterator implementation that also
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21 * provides access to individual elements based on the element's index.
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22 *
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23 * @since 3.3
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24 */
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25 public class RandomAccessListIterator : ListIterator {
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26 private ListIterator delegate_ = null;
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27
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28 /**
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29 * @param iterator
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30 */
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31 public this(ListIterator iterator) {
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32 this.delegate_ = iterator;
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33 }
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34
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35 /**
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36 * @param list
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37 */
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38 public this(List list) {
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39 if (list is null) {
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40 throw new IllegalArgumentException("list is null"); //$NON-NLS-1$
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41 }
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42 this.delegate_ = list.listIterator();
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43 }
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44
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45 /* (non-Javadoc)
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46 * @see java.util.ListIterator#add(java.lang.Object)
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47 */
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48 public void add(Object arg0) {
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49 delegate_.add(arg0);
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50 }
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51
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52 /* (non-Javadoc)
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53 * @see java.util.ListIterator#hasNext()
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54 */
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55 public bool hasNext() {
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56 return delegate_.hasNext();
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57 }
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58
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59 /* (non-Javadoc)
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60 * @see java.util.ListIterator#hasPrevious()
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61 */
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62 public bool hasPrevious() {
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63 return delegate_.hasPrevious();
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64 }
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65
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66 /* (non-Javadoc)
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67 * @see java.util.ListIterator#next()
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68 */
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69 public Object next() {
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70 return delegate_.next();
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71 }
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72
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73 /* (non-Javadoc)
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74 * @see java.util.ListIterator#nextIndex()
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75 */
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76 public int nextIndex() {
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77 return delegate_.nextIndex();
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78 }
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79
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80 /* (non-Javadoc)
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81 * @see java.util.ListIterator#previous()
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82 */
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83 public Object previous() {
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84 return delegate_.previous();
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85 }
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86
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87 /* (non-Javadoc)
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88 * @see java.util.ListIterator#previousIndex()
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89 */
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90 public int previousIndex() {
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91 return delegate_.previousIndex();
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92 }
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93
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94 /* (non-Javadoc)
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95 * @see java.util.ListIterator#remove()
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96 */
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97 public void remove() {
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98 delegate_.remove();
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99 }
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100
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101 /* (non-Javadoc)
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102 * @see java.util.ListIterator#set(java.lang.Object)
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103 */
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104 public void set(Object arg0) {
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105 delegate_.set(arg0);
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106 }
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107
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108 /**
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109 * Return the element at the specified position by moving the iterator
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110 * forward or backward in the list until it reaches the correct element.
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111 * The iterator's position after returning the element will be one after
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112 * the element returned.
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113 *
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114 * @param index The (0-based) index of the element to return.
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115 * @return the Object at index
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116 */
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117 public Object get(int index) {
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118 if (delegate_.nextIndex() is 0 && !delegate_.hasNext()) {
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119 throw new IndexOutOfBoundsException("Request for element from empty list"); //$NON-NLS-1$
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120 }
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121 if (index < 0) {
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122 throw new IndexOutOfBoundsException("Request for negative element index"); //$NON-NLS-1$
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123 }
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124
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125 while (nextIndex() < index && hasNext()) {
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126 next();
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127 }
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128 while (previousIndex() > index-1) {
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129 previous();
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130 }
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131 if (!hasNext()) {
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132 throw new IndexOutOfBoundsException("Request for element past end of list"); //$NON-NLS-1$
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133 }
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134 return next();
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135 }
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136
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137 }
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