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comparison 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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11:43904fec5dca 12:bc29606a740c
1 /*******************************************************************************
2 * Copyright (c) 2000, 2008 IBM Corporation 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 * IBM Corporation - initial API and implementation
10 * Port to the D programming language:
11 * Frank Benoit <benoit@tionex.de>
12 *******************************************************************************/
13 module org.eclipse.jface.viewers.StructuredSelection;
14
15 import org.eclipse.jface.viewers.IStructuredSelection;
16 import org.eclipse.jface.viewers.IElementComparer;
17
18
19 import org.eclipse.core.runtime.Assert;
20 import org.eclipse.jface.resource.JFaceResources;
21
22 import java.lang.all;
23 import java.util.Arrays;
24 import java.util.List;
25 import java.util.Iterator;
26
27 /**
28 * A concrete implementation of the <code>IStructuredSelection</code> interface,
29 * suitable for instantiating.
30 * <p>
31 * This class is not intended to be subclassed.
32 * </p>
33 * @noextend This class is not intended to be subclassed by clients.
34 */
35 public class StructuredSelection : IStructuredSelection {
36
37 /**
38 * The element that make up this structured selection.
39 */
40 private Object[] elements;
41
42 /**
43 * The element comparer, or <code>null</code>
44 */
45 private IElementComparer comparer;
46
47 /**
48 * The canonical empty selection. This selection should be used instead of
49 * <code>null</code>.
50 */
51 public static const StructuredSelection EMPTY;
52 static this(){
53 EMPTY = new StructuredSelection();
54 }
55 /**
56 * Creates a new empty selection.
57 * See also the static field <code>EMPTY</code> which contains an empty selection singleton.
58 *
59 * @see #EMPTY
60 */
61 public this() {
62 }
63
64 /**
65 * Creates a structured selection from the given elements.
66 *
67 * @param elements an array of elements
68 */
69 public this(Object[] elements) {
70 this.elements = new Object[elements.length];
71 System.arraycopy(elements, 0, this.elements, 0, elements.length);
72 }
73
74 /**
75 * Creates a structured selection containing a single object.
76 * The object must not be <code>null</code>.
77 *
78 * @param element the element
79 */
80 public this(Object element) {
81 Assert.isNotNull(element);
82 elements = [ element ];
83 }
84
85 /**
86 * Creates a structured selection from the given <code>List</code>.
87 * @param elements list of selected elements
88 */
89 public this(List elements) {
90 this(elements, null);
91 }
92
93 /**
94 * Creates a structured selection from the given <code>List</code> and
95 * element comparer. If an element comparer is provided, it will be used to
96 * determine equality between structured selection objects provided that
97 * they both are based on the same (identical) comparer. See bug
98 *
99 * @param elements
100 * list of selected elements
101 * @param comparer
102 * the comparer, or null
103 * @since 3.4
104 */
105 public this(List elements, IElementComparer comparer) {
106 Assert.isNotNull(cast(Object)elements);
107 this.elements = elements.toArray();
108 this.comparer = comparer;
109 }
110
111 /**
112 * Returns whether this structured selection is equal to the given object.
113 * Two structured selections are equal if they contain the same elements
114 * in the same order.
115 *
116 * @param o the other object
117 * @return <code>true</code> if they are equal, and <code>false</code> otherwise
118 */
119 public override int opEquals(Object o) {
120 if (this is o) {
121 return true;
122 }
123 //null and other classes
124 if (!(cast(StructuredSelection)o )) {
125 return false;
126 }
127 StructuredSelection s2 = cast(StructuredSelection) o;
128
129 // either or both empty?
130 if (isEmpty()) {
131 return s2.isEmpty();
132 }
133 if (s2.isEmpty()) {
134 return false;
135 }
136
137 bool useComparer = comparer !is null && comparer is s2.comparer;
138
139 //size
140 int myLen = elements.length;
141 if (myLen !is s2.elements.length) {
142 return false;
143 }
144 //element comparison
145 for (int i = 0; i < myLen; i++) {
146 if (useComparer) {
147 if (!comparer.opEquals(elements[i], s2.elements[i])) {
148 return false;
149 }
150 } else {
151 if (!elements[i].opEquals(s2.elements[i])) {
152 return false;
153 }
154 }
155 }
156 return true;
157 }
158
159 /* (non-Javadoc)
160 * Method declared in IStructuredSelection.
161 */
162 public Object getFirstElement() {
163 return isEmpty() ? null : elements[0];
164 }
165
166 /* (non-Javadoc)
167 * Method declared in ISelection.
168 */
169 public bool isEmpty() {
170 return elements is null || elements.length is 0;
171 }
172
173 /* (non-Javadoc)
174 * Method declared in IStructuredSelection.
175 */
176 public Iterator iterator() {
177 return Arrays.asList(elements is null ? null : elements)
178 .iterator();
179 }
180
181 /* (non-Javadoc)
182 * Method declared in IStructuredSelection.
183 */
184 public int size() {
185 return elements is null ? 0 : elements.length;
186 }
187
188 /* (non-Javadoc)
189 * Method declared in IStructuredSelection.
190 */
191 public Object[] toArray() {
192 return elements is null ? new Object[0] : elements.dup;
193 }
194
195 /* (non-Javadoc)
196 * Method declared in IStructuredSelection.
197 */
198 public List toList() {
199 return Arrays.asList(elements is null ? null : elements);
200 }
201
202 /**
203 * Internal method which returns a string representation of this
204 * selection suitable for debug purposes only.
205 *
206 * @return debug string
207 */
208 public override String toString() {
209 return isEmpty() ? JFaceResources.getString("<empty_selection>") : (cast(Object)toList()).toString(); //$NON-NLS-1$
210 }
211 }