fpgafitnesscomparator.java

关于多目标优化的代码

/**
 * FPGAFitnessComparator.java
 * 
 * @author Juan J. Durillo
 * @version 1.0
 */
package jmetal.base.operator.comparator;

import java.util.*;
import jmetal.base.*;
import jmetal.util.PseudoRandom;

/**
 * This class implements a <code>Comparator</code> (a method for comparing
 * <code>Solution</code> objects) based on the rank used in FPGA.
 */
public class FPGAFitnessComparator implements Comparator {
  
 /**
  * Compares two solutions.
  * @param o1 Object representing the first <code>Solution</code>.
  * @param o2 Object representing the second <code>Solution</code>.
  * @return -1, or 0, or 1 if o1 is less than, equal, or greater than o2,
  * respectively.
  */
  public int compare(Object o1, Object o2) {
    Solution solution1, solution2;
    solution1 = (Solution) o1;
    solution2 = (Solution) o2;
    
    if (solution1.getRank()==0 && solution2.getRank()> 0) {
      return -1;      
    } else if (solution1.getRank() > 0 &&  solution2.getRank() == 0) {
      return 1;
    } else {
      if (solution1.getFitness() > solution2.getFitness()) {
        return -1;
      } else if (solution1.getFitness() < solution2.getFitness()) {
        return 1;      
      } else {
        return 0;
      }
    }
  } // compare
} // FPGAFitnessComparator