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annotate org.eclipse.core.databinding.observable/src/org/eclipse/core/databinding/observable/value/ValueDiff.d @ 95:6208d4f6a277

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Added trees for databinding.beans and observable
author Frank Benoit <benoit@tionex.de>
date Tue, 21 Apr 2009 10:55:51 +0200
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children b74ac5dfcc06
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6208d4f6a277 Added trees for databinding.beans and observable
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1 /*******************************************************************************
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2 * Copyright (c) 2006, 2007 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 *******************************************************************************/
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11
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12 package org.eclipse.core.databinding.observable.value;
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13
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14 import org.eclipse.core.databinding.observable.Diffs;
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15
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16 /**
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17 * @since 1.0
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18 *
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19 */
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20 public abstract class ValueDiff {
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21 /**
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22 * Creates a value diff.
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23 */
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24 public this() {
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25 }
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26
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27 /**
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28 * @return the old value
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29 */
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30 public abstract Object getOldValue();
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31
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32 /**
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33 * @return the new value
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34 */
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35 public abstract Object getNewValue();
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36
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37 public override equals_t opEquals(Object obj) {
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38 if ( null !is cast(ValueDiff)obj ) {
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39 ValueDiff val = cast(ValueDiff) obj;
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40
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41 return Diffs.equals(val.getNewValue(), getNewValue())
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42 && Diffs.equals(val.getOldValue(), getOldValue());
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43
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44 }
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45 return false;
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46 }
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47
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48 public override hash_t toHash() {
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49 final int prime = 31;
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50 int result = 1;
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51 Object nv = getNewValue();
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52 Object ov = getOldValue();
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53 result = prime * result + ((nv is null) ? 0 : nv.hashCode());
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54 result = prime * result + ((ov is null) ? 0 : ov.hashCode());
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55 return result;
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56 }
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57
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58 /**
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59 * @see java.lang.Object#toString()
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60 */
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61 public String toString() {
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62 StringBuffer buffer = new StringBuffer();
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63 buffer
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64 .append(getClass().getName())
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65 .append("{oldValue [") //$NON-NLS-1$
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66 .append(getOldValue() !is null ? getOldValue().toString() : "null") //$NON-NLS-1$
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67 .append("], newValue [") //$NON-NLS-1$
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68 .append(getNewValue() !is null ? getNewValue().toString() : "null") //$NON-NLS-1$
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69 .append("]}"); //$NON-NLS-1$
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70
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71 return buffer.toString();
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72 }
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73 }