/*
* GeoTools - The Open Source Java GIS Toolkit
* http://geotools.org
*
* (C) 2014, Open Source Geospatial Foundation (OSGeo)
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation;
* version 2.1 of the License.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*/
package org.geotools.styling.css;
import java.util.Comparator;
/**
* Compares zIndex levels, equating {@link CssRule#NO_Z_INDEX} to 0, the base level
*
* @author Andrea Aime - GeoSolutions
*
*/
class ZIndexComparator implements Comparator<Integer> {
@Override
public int compare(Integer o1, Integer o2) {
if (o1 == null) {
o1 = 0;
}
if (o2 == null) {
o2 = 0;
}
return o1.compareTo(o2);
}
}