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Java > Open Source Codes > org > eclipse > ui > internal > keys > AbstractModifierKeyComparator


1 /*******************************************************************************
2  * Copyright (c) 2003, 2006 IBM Corporation and others.
3  * All rights reserved. This program and the accompanying materials
4  * are made available under the terms of the Eclipse Public License v1.0
5  * which accompanies this distribution, and is available at
6  * http://www.eclipse.org/legal/epl-v10.html
7  *
8  * Contributors:
9  * IBM Corporation - initial API and implementation
10  *******************************************************************************/
11 package org.eclipse.ui.internal.keys;
12
13 import java.util.Comparator JavaDoc;
14
15 import org.eclipse.ui.keys.ModifierKey;
16
17 abstract class AbstractModifierKeyComparator implements Comparator JavaDoc {
18
19     public int compare(Object JavaDoc left, Object JavaDoc right) {
20         ModifierKey modifierKeyLeft = (ModifierKey) left;
21         ModifierKey modifierKeyRight = (ModifierKey) right;
22         int modifierKeyLeftRank = rank(modifierKeyLeft);
23         int modifierKeyRightRank = rank(modifierKeyRight);
24
25         if (modifierKeyLeftRank != modifierKeyRightRank) {
26             return modifierKeyLeftRank - modifierKeyRightRank;
27         } else {
28             return modifierKeyLeft.compareTo(modifierKeyRight);
29         }
30     }
31
32     protected abstract int rank(ModifierKey modifierKey);
33 }
34
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