| /******************************************************************************* |
| * Copyright (c) 2006 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 |
| ******************************************************************************/ |
| |
| package org.eclipse.ui.internal.navigator.extensions; |
| |
| import java.util.Comparator; |
| |
| import org.eclipse.ui.navigator.INavigatorContentDescriptor; |
| import org.eclipse.ui.navigator.INavigatorContentExtension; |
| |
| /** |
| * @since 3.2 |
| * |
| */ |
| public class ExtensionPriorityComparator implements Comparator { |
| |
| /** |
| * The initialized singleton instance. |
| */ |
| public static final ExtensionPriorityComparator INSTANCE = new ExtensionPriorityComparator(true); |
| |
| /** |
| * The initialized singleton instance. |
| */ |
| public static final ExtensionPriorityComparator DESCENDING = new ExtensionPriorityComparator(false); |
| |
| private final int sortAscending; |
| |
| public ExtensionPriorityComparator(boolean toSortAscending) { |
| sortAscending = toSortAscending ? 1 : -1; |
| } |
| |
| /* |
| * (non-Javadoc) |
| * |
| * @see java.util.Comparator#compare(java.lang.Object, java.lang.Object) |
| */ |
| public int compare(Object o1, Object o2) { |
| |
| INavigatorContentDescriptor lvalue = null; |
| INavigatorContentDescriptor rvalue = null; |
| |
| if (o1 instanceof INavigatorContentDescriptor) { |
| lvalue = (INavigatorContentDescriptor) o1; |
| } else if (o1 instanceof INavigatorContentExtension) { |
| lvalue = ((INavigatorContentExtension) o1).getDescriptor(); |
| } |
| |
| if (o2 instanceof INavigatorContentDescriptor) { |
| rvalue = (INavigatorContentDescriptor) o2; |
| } else if (o2 instanceof INavigatorContentExtension) { |
| rvalue = ((INavigatorContentExtension) o2).getDescriptor(); |
| } |
| |
| if (lvalue == null || rvalue == null) { |
| return -1 * sortAscending; |
| } |
| |
| int c = lvalue.getPriority() - rvalue.getPriority(); |
| if (c != 0) { |
| return c * sortAscending; |
| } |
| return lvalue.getId().compareTo(rvalue.getId()) * sortAscending; |
| |
| } |
| |
| } |