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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 module org.eclipse.core.databinding.observable.value.ValueDiff;
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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.core.databinding.observable.Diffs;
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17
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18 /**
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19 * @since 1.0
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20 *
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21 */
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22 public abstract class ValueDiff {
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23 /**
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24 * Creates a value diff.
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25 */
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26 public this() {
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27 }
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28
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29 /**
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30 * @return the old value
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31 */
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32 public abstract Object getOldValue();
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33
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34 /**
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35 * @return the new value
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36 */
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37 public abstract Object getNewValue();
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38
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39 public override bool opEquals(Object obj) {
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40 if ( null !is cast(ValueDiff)obj ) {
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41 ValueDiff val = cast(ValueDiff) obj;
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42
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43 return Diffs.equals(val.getNewValue(), getNewValue())
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44 && Diffs.equals(val.getOldValue(), getOldValue());
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45
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46 }
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47 return false;
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48 }
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49
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50 public int hashCode() {
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51 final int prime = 31;
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52 int result = 1;
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53 Object nv = getNewValue();
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54 Object ov = getOldValue();
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55 result = prime * result + ((nv is null) ? 0 : nv.hashCode());
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56 result = prime * result + ((ov is null) ? 0 : ov.hashCode());
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57 return result;
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58 }
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59
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60 /**
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61 * @see java.lang.Object#toString()
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62 */
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63 public String toString() {
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64 StringBuffer buffer = new StringBuffer();
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65 buffer
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66 .append(getClass().getName())
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67 .append("{oldValue [") //$NON-NLS-1$
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68 .append(getOldValue() !is null ? getOldValue().toString() : "null") //$NON-NLS-1$
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69 .append("], newValue [") //$NON-NLS-1$
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70 .append(getNewValue() !is null ? getNewValue().toString() : "null") //$NON-NLS-1$
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71 .append("]}"); //$NON-NLS-1$
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72
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73 return buffer.toString();
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74 }
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75 }
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