/*******************************************************************************
 * Copyright 2017 Graz University of Technology
 * EAAF-Core Components has been developed in a cooperation between EGIZ,  
 * A-SIT+, A-SIT, and Graz University of Technology.
 *
 * Licensed under the EUPL, Version 1.2 or - as soon they will be approved by
 * the European Commission - subsequent versions of the EUPL (the "Licence");
 * You may not use this work except in compliance with the Licence.
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 * https://joinup.ec.europa.eu/news/understanding-eupl-v12
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the Licence is distributed on an "AS IS" basis,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the Licence for the specific language governing permissions and
 * limitations under the Licence.
 *
 * This product combines work with different licenses. See the "NOTICE" text
 * file for details on the various modules and licenses.
 * The "NOTICE" text file is part of the distribution. Any derivative works
 * that you distribute must include a readable copy of the "NOTICE" text file.
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package at.gv.egiz.eaaf.core.api.idp.process;

/**
 * Evaluates a given {@code expression} returning a boolean value.
 * 
 * @author tknall
 */
public interface ExpressionEvaluator {

	/**
	 * Evaluates a given {@code expression} returning a boolean value.
	 * 
	 * @param expressionContext
	 *            The context which can be used for evaluation of the expression.
	 * @param expression
	 *            The expression resulting in a boolean (must not be {@code null}).
	 * @return A boolean value.
	 * @throws IllegalArgumentException
	 *             In case of an invalid {@code expression}.
	 * @throws NullPointerException
	 *             In case of a {@code null} expression.
	 */
	boolean evaluate(ExpressionEvaluationContext expressionContext, String expression);

}