/**
* AnalyzerBeans
* Copyright (C) 2014 Neopost - Customer Information Management
*
* This copyrighted material is made available to anyone wishing to use, modify,
* copy, or redistribute it subject to the terms and conditions of the GNU
* Lesser General Public License, as published by the Free Software Foundation.
*
* This program 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.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this distribution; if not, write to:
* Free Software Foundation, Inc.
* 51 Franklin Street, Fifth Floor
* Boston, MA 02110-1301 USA
*/
package org.eobjects.analyzer.util;
import java.io.Serializable;
import java.util.Comparator;
/**
* A comparable that delegates to {@link Comparator} methods, but tolerates null
* values by checking for this before delegating.
*
*
*
* @param <E>
* any comparable type
*/
public class NullTolerableComparator<E extends Comparable<? super E>> implements Comparator<E>, Serializable {
private static final long serialVersionUID = 1L;
public static <E extends Comparable<? super E>> Comparator<E> get(Class<E> clazz) {
return new NullTolerableComparator<E>();
}
@Override
public int compare(E o1, E o2) {
if (o1 == null && o2 == null) {
return 0;
}
if (o1 == null) {
return -1;
}
if (o2 == null) {
return 1;
}
return o1.compareTo(o2);
}
}