package net.toodarkpark.util.comparison;

import java.util.*;
import org.apache.commons.beanutils.PropertyUtils;
import org.apache.commons.collections.Predicate;

// qualifier to test for null conditions

public class NullPredicate implements Predicate
{
    protected Comparator comparator;
    
    public NullPredicate()
    {
        super();
        
        comparator = null;
    }

    public NullPredicate( Comparator aComparator )
    {
        this();
        
        comparator = aComparator;
    }
    
    public boolean evaluate( Object value ) throws ClassCastException, NullPointerException, Exception
    {
		if( comparator != null )
		{
			return comparator.compare( value, null ) == 0;
		}
		else
		{
			return value == null;
		}
    }
}