package org.glassfish.pfl.basic.contain ;
import java.util.Comparator ;
public class PairComparator<S,T> implements Comparator<Pair<S,T>>
{
private Comparator<? super S> sc ;
private Comparator<? super T> tc ;
public PairComparator( Comparator<? super S> sc, Comparator<? super T> tc )
{
if ((sc == null) || (tc == null)) {
throw new IllegalArgumentException();
}
this.sc = sc ;
this.tc = tc ;
}
@Override
public int compare( Pair<S,T> o1, Pair<S,T> o2 )
{
int res = sc.compare( o1.first(), o2.first() ) ;
if (res == 0) {
return tc.compare(o1.second(), o2.second());
} else {
return res;
}
}
@Override
public boolean equals( Object obj )
{
if (!(obj instanceof PairComparator)) {
return false;
}
if (obj == this) {
return true;
}
@SuppressWarnings("unchecked")
PairComparator<S,T> other = (PairComparator<S,T>)obj ;
return other.sc.equals( sc ) && other.tc.equals( tc ) ;
}
@Override
public int hashCode() {
return sc.hashCode() ^ tc.hashCode() ;
}
@Override
public String toString() {
return "PairComparator[" + sc + "," + tc + "]" ;
}
}