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Java Predicate with SQL-like syntax support

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package org.joo.libra.pointer;

import org.joo.libra.PredicateContext;
import org.joo.libra.common.CompositionPredicate;
import org.joo.libra.common.HasValue;

/**
 * Represents a is null predicate. It will be satisfied if and only
 * if the given value is null.
 * 
 * @author griever
 *
 */
public class IsNullPredicate implements CompositionPredicate {

	private HasValue value;

	public IsNullPredicate(final HasValue value) {
		this.value = value;
	}

	@Override
	public boolean satisfiedBy(final PredicateContext context) {
		return value.getValue(context) == null;
	}

	public String toString() {
		return "IS_NULL(" + value + ")";
	}
}
    

    

    

            

    

            



    
    






    
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