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Holmes is a library that provides a simple and fluent API for writing business rules validations on Java projects.

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package org.holmes.evaluator;

import org.holmes.Evaluator;
import org.holmes.Joint;

/**
 * A convenience implementation for {@link Evaluator} subclasses.
 * 
 * @author diegossilveira
 * 
 * @param 
 *            the type evaluated by this Evaluator.
 */
abstract class AbstractEvaluator implements Evaluator {

	private final T target;

	private Joint joint;

	private Evaluation evaluation;

	AbstractEvaluator(T target) {

		this.target = target;
	}

	Joint getJoint() {

		return joint;
	}

	@Override
	public void setJoint(Joint joint) {

		this.joint = joint;
	}

	AbstractEvaluator setEvaluation(Evaluation evaluation) {

		this.evaluation = evaluation;
		return this;
	}

	@Override
	public boolean evaluate() {

		try {
			return evaluation.evaluate(target);
		} catch (NullPointerException e) {
			return false;
		}
	}
}