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/*******************************************************************************
* Copyright (c) 2010-2013, Zoltan Ujhelyi, Istvan Rath and Daniel Varro
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v. 2.0 which is available at
* http://www.eclipse.org/legal/epl-v20.html.
*
* SPDX-License-Identifier: EPL-2.0
*******************************************************************************/
package tools.refinery.viatra.runtime.matchers.psystem;
/**
* An expression evaluator is used to execute arbitrary Java code during pattern matching. In order to include the
* evaluation in the planning seemlessly it is expected from the evaluator implementors to report all used PVariables by
* name.
*
* @author Zoltan Ujhelyi
*
*/
public interface IExpressionEvaluator {
/**
* A textual description of the expression. Used only for debug purposes, but must not be null.
*/
String getShortDescription();
/**
* All input parameter names should be reported correctly.
*/
Iterable<String> getInputParameterNames();
/**
* The expression evaluator code
*
* @param provider
* the value provider is an engine-specific way of reading internal variable tuples to evaluate the
* expression with
* @return the result of the expression: in case of predicate evaluation the return value must be true or false;
* otherwise the result can be an arbitrary object. No null values should be returned.
* @throws Exception
*/
Object evaluateExpression(IValueProvider provider) throws Exception;
}
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