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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;
/**
* Helper interface to get values from a tuple of variables. All pattern matching engines are expected to implement this
* to handle their internal structures.
*
* @author Zoltan Ujhelyi
*
*/
public interface IValueProvider {
/**
* Returns the value of the selected variable
* @param variableName
* @return the value of the variable; never null
* @throws IllegalArgumentException if the variable is not defined
*/
Object getValue(String variableName);
}
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