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comparison org.eclipse.core.databinding/src/org/eclipse/core/internal/databinding/RandomAccessListIterator.d @ 78:0a55d2d5a946

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Added file for databinding
author Frank Benoit <benoit@tionex.de>
date Tue, 14 Apr 2009 11:35:29 +0200
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76:f05e6e8b2f2d 78:0a55d2d5a946
1 /*******************************************************************************
2 * Copyright (c) 2006 The Pampered Chef and others.
3 * All rights reserved. This program and the accompanying materials
4 * are made available under the terms of the Eclipse Public License v1.0
5 * which accompanies this distribution, and is available at
6 * http://www.eclipse.org/legal/epl-v10.html
7 *
8 * Contributors:
9 * The Pampered Chef - initial API and implementation
10 ******************************************************************************/
11
12 module org.eclipse.core.internal.databinding.RandomAccessListIterator;
13
14 import java.lang.all;
15
16 import java.util.List;
17 import java.util.ListIterator;
18
19 /**
20 * Class RandomAccessListIterator. A ListIterator implementation that also
21 * provides access to individual elements based on the element's index.
22 *
23 * @since 3.3
24 */
25 public class RandomAccessListIterator : ListIterator {
26 private ListIterator delegate_ = null;
27
28 /**
29 * @param iterator
30 */
31 public this(ListIterator iterator) {
32 this.delegate_ = iterator;
33 }
34
35 /**
36 * @param list
37 */
38 public this(List list) {
39 if (list is null) {
40 throw new IllegalArgumentException("list is null"); //$NON-NLS-1$
41 }
42 this.delegate_ = list.listIterator();
43 }
44
45 /* (non-Javadoc)
46 * @see java.util.ListIterator#add(java.lang.Object)
47 */
48 public void add(Object arg0) {
49 delegate_.add(arg0);
50 }
51
52 /* (non-Javadoc)
53 * @see java.util.ListIterator#hasNext()
54 */
55 public bool hasNext() {
56 return delegate_.hasNext();
57 }
58
59 /* (non-Javadoc)
60 * @see java.util.ListIterator#hasPrevious()
61 */
62 public bool hasPrevious() {
63 return delegate_.hasPrevious();
64 }
65
66 /* (non-Javadoc)
67 * @see java.util.ListIterator#next()
68 */
69 public Object next() {
70 return delegate_.next();
71 }
72
73 /* (non-Javadoc)
74 * @see java.util.ListIterator#nextIndex()
75 */
76 public int nextIndex() {
77 return delegate_.nextIndex();
78 }
79
80 /* (non-Javadoc)
81 * @see java.util.ListIterator#previous()
82 */
83 public Object previous() {
84 return delegate_.previous();
85 }
86
87 /* (non-Javadoc)
88 * @see java.util.ListIterator#previousIndex()
89 */
90 public int previousIndex() {
91 return delegate_.previousIndex();
92 }
93
94 /* (non-Javadoc)
95 * @see java.util.ListIterator#remove()
96 */
97 public void remove() {
98 delegate_.remove();
99 }
100
101 /* (non-Javadoc)
102 * @see java.util.ListIterator#set(java.lang.Object)
103 */
104 public void set(Object arg0) {
105 delegate_.set(arg0);
106 }
107
108 /**
109 * Return the element at the specified position by moving the iterator
110 * forward or backward in the list until it reaches the correct element.
111 * The iterator's position after returning the element will be one after
112 * the element returned.
113 *
114 * @param index The (0-based) index of the element to return.
115 * @return the Object at index
116 */
117 public Object get(int index) {
118 if (delegate_.nextIndex() is 0 && !delegate_.hasNext()) {
119 throw new IndexOutOfBoundsException("Request for element from empty list"); //$NON-NLS-1$
120 }
121 if (index < 0) {
122 throw new IndexOutOfBoundsException("Request for negative element index"); //$NON-NLS-1$
123 }
124
125 while (nextIndex() < index && hasNext()) {
126 next();
127 }
128 while (previousIndex() > index-1) {
129 previous();
130 }
131 if (!hasNext()) {
132 throw new IndexOutOfBoundsException("Request for element past end of list"); //$NON-NLS-1$
133 }
134 return next();
135 }
136
137 }