com.github.dakusui.lisj.pred.LogicalPredicate Maven / Gradle / Ivy

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package com.github.dakusui.lisj.pred;

import com.github.dakusui.jcunit.exceptions.JCUnitException;
import com.github.dakusui.lisj.Basic;
import com.github.dakusui.lisj.CUT;
import com.github.dakusui.lisj.Context;
import com.github.dakusui.lisj.FormEvaluator;
import com.github.dakusui.lisj.FormResult;


public abstract class LogicalPredicate extends BasePredicate {
	/**
	 * Serial version UID.
	 */
	private static final long serialVersionUID = -1779614522843256950L;

	@Override
	protected FormResult evaluateEach(Context context, Object currentParam, FormResult lastResult) throws JCUnitException, CUT {
		FormResult ret = super.evaluateEach(context, currentParam, lastResult);
		return ret;
	}
	
	@Override
	protected FormResult evaluateLast(Context context,
			Object[] evaluatedParams, FormResult lastResult) {
		return lastResult;
	}
	
	@Override
	protected Object checkParams(Object params) {
		super.checkParams(params);
		for (Object cur : Basic.iterator(params)) {
			if (cur == null) throw new IllegalArgumentException();
		}
		return params;
	}

	@Override
	protected FormEvaluator newEvaluator(Context context, Object params) {
		/*
		 * Since it's sure that the subclasses of this class doesn't need to 
		 * create child context, FormEvaluator is created with incoming context. 
		 */
		return new FormEvaluator(context, this, checkParams(params), new FormResult(0, Basic.length(params), initialValue()));
	}

	/*
	 * Implementations of this class must returns a boolean value which will be used
	 * when no parameters are given to this predicate.
	 */
	abstract protected boolean initialValue();
}