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package org.glassfish.gmbal.generic ;

import java.util.Comparator ;

public class PairComparator implements Comparator>
{
    private Comparator sc ;
    private Comparator tc ;

    public PairComparator( Comparator sc, Comparator tc )
    {
	if ((sc == null) || (tc == null))
	    throw new IllegalArgumentException() ;

	this.sc = sc ;
	this.tc = tc ;
    }

    public int compare( Pair o1, Pair o2 )
    {
	int res = sc.compare( o1.first(), o2.first() ) ;
	if (res == 0)
	    return tc.compare( o1.second(), o2.second() ) ;
	else
	    return res ;
    }

    public boolean equals( Object obj ) 
    {
	if (!(obj instanceof PairComparator))
	    return false ;

	if (obj == this)
	    return true ;

	PairComparator other = (PairComparator)obj ;
	return other.sc.equals( sc ) && other.tc.equals( tc ) ;
    }

    public int hashCode() {
	return sc.hashCode() ^ tc.hashCode() ;
    }

    public String toString() {
	return "PairComparator[" + sc + "," + tc + "]" ;
    }
}