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Java Predicate with SQL-like syntax support

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package org.joo.libra.sql.node;

import org.joo.libra.Predicate;
import org.joo.libra.PredicateContext;
import org.joo.libra.common.HasValue;
import org.joo.libra.pointer.VariablePredicate;

import lombok.Data;

@Data
public class ConditionalExpressionNode implements ExpressionNode, HasValue {

	private ExpressionNode main;

	private HasValue left;

	private HasValue right;

	private Predicate mainPredicate;

	@Override
	public Predicate buildPredicate() {
		return new VariablePredicate(this);
	}

	@Override
	public Object getValue(final PredicateContext context) {
		if (mainPredicate == null)
			mainPredicate = main.buildPredicate();
		boolean satisfied = mainPredicate.satisfiedBy(context);
		return satisfied ? left.getValue(context) : right.getValue(context);
	}
}    

    

    

            

    

            



    
    






    
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