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'databene commons' is an open source Java library by Volker Bergmann.
It provides extensions to the Java core library by utility classes, abstract concepts
and concrete implementations.
/*
* Copyright (C) 2004-2015 Volker Bergmann ([email protected]).
* All rights reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
* http://www.apache.org/licenses/LICENSE-2.0
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.databene.commons.comparator;
import java.util.Comparator;
import java.math.BigInteger;
import java.math.BigDecimal;
/**
* Generic comparator for Number objects of different type.
* Created: 09.10.2006 19:46:22
* @param the type of objects to be compared
* @since 0.1
* @author Volker Bergmann
*/
public class NumberComparator implements Comparator {
@Override
public int compare(E n1, E n2) {
return compareNumbers(n1, n2);
}
public static int compareNumbers(T n1, T n2) {
if (n1 == null || n2 == null)
throw new IllegalArgumentException("comparing null value");
if (n1 instanceof Integer)
return ((Integer) n1).compareTo(n2.intValue());
else if (n1 instanceof Long)
return ((Long) n1).compareTo(n2.longValue());
else if (n1 instanceof Short)
return ((Short) n1).compareTo(n2.shortValue());
else if (n1 instanceof Byte)
return ((Byte) n1).compareTo(n2.byteValue());
else if (n1 instanceof Float)
return ((Float) n1).compareTo(n2.floatValue());
else if (n1 instanceof Double)
return ((Double) n1).compareTo(n2.doubleValue());
else if (n1 instanceof BigInteger)
return ((BigInteger) n1).compareTo((BigInteger) n2);
else if (n1 instanceof BigDecimal)
return ((BigDecimal) n1).compareTo((BigDecimal) n2);
else
throw new UnsupportedOperationException("Unsupported Number type: " + n1.getClass());
}
}