| /******************************************************************************* |
| * Copyright (c) 2006, 2009 IBM Corporation and others. |
| * All rights reserved. This program and the accompanying materials |
| * are made available under the terms of the Eclipse Public License v1.0 |
| * which accompanies this distribution, and is available at |
| * http://www.eclipse.org/legal/epl-v10.html |
| * |
| * Contributors: |
| * IBM Corporation - initial API and implementation |
| * Matthew Hall - bug 194734 |
| *******************************************************************************/ |
| |
| package org.eclipse.core.databinding.observable.value; |
| |
| import org.eclipse.core.databinding.observable.Diffs; |
| import org.eclipse.core.databinding.observable.IDiff; |
| |
| /** |
| * @param <T> |
| * @since 1.0 |
| * |
| */ |
| public abstract class ValueDiff<T> implements IDiff { |
| /** |
| * Creates a value diff. |
| */ |
| public ValueDiff() { |
| } |
| |
| /** |
| * @return the old value |
| */ |
| public abstract T getOldValue(); |
| |
| /** |
| * @return the new value |
| */ |
| public abstract T getNewValue(); |
| |
| public boolean equals(Object obj) { |
| if (obj instanceof ValueDiff) { |
| ValueDiff<?> val = (ValueDiff<?>) obj; |
| |
| return Diffs.equals(val.getNewValue(), getNewValue()) |
| && Diffs.equals(val.getOldValue(), getOldValue()); |
| |
| } |
| return false; |
| } |
| |
| public int hashCode() { |
| final int prime = 31; |
| int result = 1; |
| Object nv = getNewValue(); |
| Object ov = getOldValue(); |
| result = prime * result + ((nv == null) ? 0 : nv.hashCode()); |
| result = prime * result + ((ov == null) ? 0 : ov.hashCode()); |
| return result; |
| } |
| |
| /** |
| * @see java.lang.Object#toString() |
| */ |
| public String toString() { |
| StringBuffer buffer = new StringBuffer(); |
| buffer.append(getClass().getName()) |
| .append("{oldValue [") //$NON-NLS-1$ |
| .append(getOldValue() != null ? getOldValue().toString() |
| : "null") //$NON-NLS-1$ |
| .append("], newValue [") //$NON-NLS-1$ |
| .append(getNewValue() != null ? getNewValue().toString() |
| : "null") //$NON-NLS-1$ |
| .append("]}"); //$NON-NLS-1$ |
| |
| return buffer.toString(); |
| } |
| } |