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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.basicdeferred;
import java.util.ArrayList;
import java.util.Collections;
import java.util.LinkedHashSet;
import java.util.Map;
import java.util.Set;
import tools.refinery.viatra.runtime.matchers.context.IQueryMetaContext;
import tools.refinery.viatra.runtime.matchers.psystem.IExpressionEvaluator;
import tools.refinery.viatra.runtime.matchers.psystem.PBody;
import tools.refinery.viatra.runtime.matchers.psystem.PVariable;
import tools.refinery.viatra.runtime.matchers.tuple.Tuples;
/**
* @author Zoltan Ujhelyi
*
*/
public class ExpressionEvaluation extends BaseTypeSafeConstraint {
private IExpressionEvaluator evaluator;
private boolean isUnwinding;
public ExpressionEvaluation(PBody pBody, IExpressionEvaluator evaluator, PVariable outputVariable) {
this(pBody, evaluator, outputVariable, false);
}
/**
* @since 2.4
*/
public ExpressionEvaluation(PBody pBody, IExpressionEvaluator evaluator, PVariable outputVariable,
boolean isUnwinding) {
super(pBody, getPVariablesOfExpression(pBody, evaluator), outputVariable);
this.evaluator = evaluator;
this.isUnwinding = isUnwinding;
}
/**
* @since 2.4
*/
public boolean isUnwinding() {
return isUnwinding;
}
public IExpressionEvaluator getEvaluator() {
return evaluator;
}
@Override
protected String toStringRest() {
return Tuples.flatTupleOf(new ArrayList<PVariable>(inputVariables).toArray()).toString() + "|="
+ evaluator.getShortDescription();
}
@Override
public Map<Set<PVariable>, Set<PVariable>> getFunctionalDependencies(IQueryMetaContext context) {
if (outputVariable == null)
return Collections.emptyMap();
else
return Collections.singletonMap(inputVariables, Collections.singleton(outputVariable));
}
private static Set<PVariable> getPVariablesOfExpression(PBody pBody, IExpressionEvaluator evaluator) {
// use a linked set, so that the variables will come in the order of the parameters
Set<PVariable> result = new LinkedHashSet<PVariable>();
for (String name : evaluator.getInputParameterNames()) {
PVariable variable = pBody.getOrCreateVariableByName(name);
result.add(variable);
}
return result;
}
}
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