org.moeaframework.core.comparator
Class ChainedComparator

java.lang.Object
  org.moeaframework.core.comparator.ChainedComparator

All Implemented Interfaces:

Serializable, DominanceComparator

Direct Known Subclasses:

NondominatedSortingComparator, ParetoDominanceComparator

public class ChainedComparator
extends Object
implements DominanceComparator, Serializable

Applies any number of comparators in succession, returning the result from the first comparator producing a non-zero return value. If no comparators produce a non-zero return value, 0 is returned.

For example, the following:

 Comparator comparator = new ChainedComparator(comparator1, comparator2); 
 return comparator.compare(s1, s2);
 

is equivalent to

 int flag1 = comparator1.compare(s1, s2);
 if (flag1 == 0) {
   return comparator2.compare(s1, s2);
 } else {
   return flag1;
 }
 

See Also:

Serialized Form

Constructor Summary

ChainedComparator(DominanceComparator... comparators)
Constructs a chained comparator for applying the specified comparators in order, returning the result from the first comparator producing a non-zero return value.

Method Summary

int	compare(Solution solution1, Solution solution2) Compares the two solutions using a dominance relation, returning -1 if solution1 dominates solution2, 1 if solution2 dominates solution1, and 0 if the solutions are non-dominated.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

ChainedComparator

public ChainedComparator(DominanceComparator... comparators)

Constructs a chained comparator for applying the specified comparators in order, returning the result from the first comparator producing a non-zero return value. If no comparators produce a non-zero return value, 0 is returned.

Parameters:

comparators - the comparators in the order they are to be applied

Method Detail

compare

public int compare(Solution solution1,
                   Solution solution2)

Description copied from interface: DominanceComparator

Compares the two solutions using a dominance relation, returning -1 if solution1 dominates solution2, 1 if solution2 dominates solution1, and 0 if the solutions are non-dominated.

Specified by:

compare in interface DominanceComparator

Parameters:

solution1 - the first solution

solution2 - the second solution

Returns:

-1 if solution1 dominates solution2, 1 if solution2 dominates solution1, and 0 if the solutions are non-dominated