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'rapiddweller Common' is an open source Java library forked from Databene Commons by Volker Bergmann. It provides extensions to the Java core library by utility classes, abstract concepts and concrete implementations.

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/*
 * 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 com.rapiddweller.common.comparator;

import java.math.BigDecimal;
import java.math.BigInteger;
import java.util.Comparator;

/**
 * Generic comparator for Number objects of different type.
 * Created: 09.10.2006 19:46:22
 *
 * @param  the type of objects to be compared
 * @author Volker Bergmann
 * @since 0.1
 */
public class NumberComparator implements Comparator {

  @Override
  public int compare(E n1, E n2) {
    return compareNumbers(n1, n2);
  }

  /**
   * Compare numbers int.
   *
   * @param  the type parameter
   * @param n1  the n 1
   * @param n2  the n 2
   * @return the int
   */
  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());
    }
  }
}