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1 /*******************************************************************************
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2 * Copyright (c) 2008 Matthew Hall 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 * Matthew Hall - initial API and implementation (bug 215531)
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10 ******************************************************************************/
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11
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12 module org.eclipse.jface.internal.databinding.viewers.ViewerElementWrapper;
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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 org.eclipse.jface.viewers.IElementComparer;
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17
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18 /**
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19 * A wrapper class for viewer elements, which uses an {@link IElementComparer}
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20 * for computing {@link Object#equals(Object) equality} and
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21 * {@link Object#hashCode() hashes}.
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22 *
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23 * @since 1.2
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24 */
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25 public class ViewerElementWrapper {
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26 private final Object element;
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27 private final IElementComparer comparer;
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28
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29 /**
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30 * Constructs a ViewerElementWrapper wrapping the given element
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31 *
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32 * @param element
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33 * the element being wrapped
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34 * @param comparer
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35 * the comparer to use for computing equality and hash codes.
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36 */
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37 public this(Object element, IElementComparer comparer) {
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38 if (comparer is null)
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39 throw new NullPointerException();
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40 this.element = element;
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41 this.comparer = comparer;
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42 }
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43
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44 public bool equals(Object obj) {
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45 if (!(null !is cast(ViewerElementWrapper)obj)) {
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46 return false;
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47 }
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48 return comparer.equals(element, (cast(ViewerElementWrapper) obj).element);
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49 }
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50
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51 public int hashCode() {
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52 return comparer.hashCode(element);
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53 }
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54
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55 Object unwrap() {
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56 return element;
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57 }
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58 }
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