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JPMML class model evaluator extensions

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/*
 * Copyright (c) 2018 Villu Ruusmann
 *
 * This file is part of JPMML-Evaluator
 *
 * JPMML-Evaluator is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * JPMML-Evaluator is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with JPMML-Evaluator.  If not, see .
 */
package org.jpmml.evaluator;

import org.jpmml.evaluator.functions.ValueFunction;

/**
 * @see ValueFunction
 */
abstract
public class JavaValuePredicate extends JavaSimplePredicate {

	JavaValuePredicate(int index){
		super(index);
	}

	abstract
	public Boolean evaluate(boolean isMissing);

	@Override
	public Boolean evaluate(EvaluationContext context){
		FieldValue value = context.evaluate(getIndex());

		return evaluate(FieldValueUtil.isMissing(value));
	}

	static
	public class IsMissing extends JavaValuePredicate {

		public IsMissing(int index){
			super(index);
		}

		@Override
		public Boolean evaluate(boolean isMissing){
			return Boolean.valueOf(isMissing);
		}
	}

	static
	public class IsNotMissing extends JavaValuePredicate {

		public IsNotMissing(int index){
			super(index);
		}

		@Override
		public Boolean evaluate(boolean isMissing){
			return Boolean.valueOf(!isMissing);
		}
	}
}