com.github.dakusui.lisj.pred.Not 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 class Not extends LogicalPredicate {
	/**
	 * Serial version UID.
	 */
	private static final long serialVersionUID = 8870334868634469182L;

	@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) {
		FormResult ret = lastResult;
		Object target = evaluatedParams[0];
		if (!(target instanceof Boolean)) {
			throw new IllegalArgumentException(msgReturnedTypeMismatch(Boolean.class, target));
		}
		ret.value(!((Boolean)target));
		return ret;
	}
	
	@Override
	protected Object checkParams(Object params) {
		super.checkParams(params);
		if (Basic.length(params) != 1) { throw new IllegalArgumentException(); }
		return params;
	}
	
	@Override
	protected FormEvaluator newEvaluator(Context context, Object params) {
		/*
		 * Since it's sure 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), null));
	}

	@Override
	protected boolean initialValue() {
		// This value will never be used since an exception will be thrown instead
		// in case no parameters are given to this predicate.
		return false;
	}
}