| /******************************************************************************* |
| * Copyright (c) 2006, 2007 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 251884 |
| *******************************************************************************/ |
| |
| package org.eclipse.core.databinding.observable.set; |
| |
| import java.util.Set; |
| |
| /** |
| * @since 1.0 |
| * |
| */ |
| public abstract class SetDiff { |
| |
| /** |
| * @return the set of added elements |
| */ |
| public abstract Set getAdditions(); |
| |
| /** |
| * @return the set of removed elements |
| */ |
| public abstract Set getRemovals(); |
| |
| /** |
| * Returns true if the diff has no added or removed elements. |
| * |
| * @return true if the diff has no added or removed elements. |
| * @since 1.2 |
| */ |
| public boolean isEmpty() { |
| return getAdditions().isEmpty() && getRemovals().isEmpty(); |
| } |
| |
| /** |
| * Applies the changes in this diff to the given set |
| * |
| * @param set |
| * the set to which the diff will be applied |
| * @since 1.2 |
| */ |
| public void applyTo(Set set) { |
| set.addAll(getAdditions()); |
| set.removeAll(getRemovals()); |
| } |
| |
| /** |
| * @see java.lang.Object#toString() |
| */ |
| public String toString() { |
| StringBuffer buffer = new StringBuffer(); |
| buffer |
| .append(getClass().getName()) |
| .append("{additions [") //$NON-NLS-1$ |
| .append(getAdditions() != null ? getAdditions().toString() : "null") //$NON-NLS-1$ |
| .append("], removals [") //$NON-NLS-1$ |
| .append(getRemovals() != null ? getRemovals().toString() : "null") //$NON-NLS-1$ |
| .append("]}"); //$NON-NLS-1$ |
| |
| return buffer.toString(); |
| } |
| } |