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/*******************************************************************************
* Copyright (c) 2006 Sybase, Inc. 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:
* Sybase, Inc. - initial API and implementation
*******************************************************************************/
package org.eclipse.jst.pagedesigner.utils;
import java.util.Comparator;
import java.util.HashMap;
import java.util.Map;
import org.eclipse.core.runtime.Assert;
import org.w3c.dom.Node;
/**
* To sort the location of tags, this comparator is used to compare tags' order.
*
* @author mengbo
*/
public class NodeLocationComparator implements Comparator {
private final static Map orders = new HashMap();
private final static Integer DEFAULT_ORDER = new Integer(Integer.MAX_VALUE);
private static NodeLocationComparator _instance = new NodeLocationComparator();
static {
orders.put("taglib", new Integer(0));
orders.put("directive.taglib", new Integer(0));
orders.put("head", new Integer(1));
}
private NodeLocationComparator() {
// no external instantiation
}
public static NodeLocationComparator getInstance() {
return _instance;
}
/**
* The object to be compared could be Node or tag name.
*
* @see java.util.Comparator#compare(java.lang.Object, java.lang.Object)
*/
public int compare(Object o1, Object o2) {
Assert.isTrue((o1 instanceof Node || o1 instanceof String)
&& (o2 instanceof Node || o2 instanceof String));
Integer i1 = getOrder(o1);
Integer i2 = getOrder(o2);
return i1.compareTo(i2);
}
private Integer getOrder(Object n) {
String name = null;
if (n instanceof Node) {
name = ((Node) n).getLocalName();
} else {
name = (String) n;
}
if (name != null) {
Object order = orders.get(name);
if (order != null) {
return (Integer) order;
}
}
return DEFAULT_ORDER;
}
}
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