// ValueComparator.java
//
// Author:
// Antonio J. Nebro <antonio@lcc.uma.es>
// Juan J. Durillo <durillo@lcc.uma.es>
//
// Copyright (c) 2011 Antonio J. Nebro, Juan J. Durillo
//
// This program 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, either version 3 of the License, or
// (at your option) any later version.
//
// 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 program. If not, see <http://www.gnu.org/licenses/>.
package jmetal.qualityIndicator.util;
import java.util.Comparator;
/**
* This class implemnents the <code>Comparator</code> interface. It is used
* to compare points given as <code>double</code>. The points are compared
* taken account the value of a index
*/
public class ValueComparator implements Comparator {
/**
* Stores the value of the index to compare
*/
private int index_;
/**
* Constructor.
* Creates a new instance of ValueComparator
*/
public ValueComparator(int index) {
index_ = index;
}
/**
* Compares the objects o1 and o2.
* @param o1 An object that reference a double[]
* @param o2 An object that reference a double[]
* @return -1 if o1 < o1, 1 if o1 > o2 or 0 in other case.
*/
public int compare(Object o1, Object o2) {
//Cast to double [] o1 and o2.
double [] pointOne = (double [])o1;
double [] pointTwo = (double [])o2;
if (pointOne[index_] < pointTwo[index_]) {
return -1;
} else if (pointOne[index_] > pointTwo[index_]) {
return 1;
} else {
return 0;
}
} // compare
} // ValueComparator