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/*******************************************************************************
* Copyright (c) 2010-2016, Tamas Szabo, 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.Collections;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;
import tools.refinery.viatra.runtime.matchers.context.IInputKey;
import tools.refinery.viatra.runtime.matchers.context.IQueryMetaContext;
import tools.refinery.viatra.runtime.matchers.psystem.ITypeInfoProviderConstraint;
import tools.refinery.viatra.runtime.matchers.psystem.PBody;
import tools.refinery.viatra.runtime.matchers.psystem.PVariable;
import tools.refinery.viatra.runtime.matchers.psystem.TypeJudgement;
import tools.refinery.viatra.runtime.matchers.psystem.aggregations.BoundAggregator;
import tools.refinery.viatra.runtime.matchers.psystem.queries.PQuery;
import tools.refinery.viatra.runtime.matchers.tuple.Tuple;
import tools.refinery.viatra.runtime.matchers.tuple.Tuples;
/**
* The PSystem representation of an aggregation.
*
* @author Tamas Szabo
* @since 1.4
*/
public class AggregatorConstraint extends PatternCallBasedDeferred implements ITypeInfoProviderConstraint {
protected PVariable resultVariable;
private BoundAggregator aggregator;
protected int aggregatedColumn;
public AggregatorConstraint(BoundAggregator aggregator, PBody pBody, Tuple actualParametersTuple, PQuery query,
PVariable resultVariable, int aggregatedColumn) {
super(pBody, actualParametersTuple, query, Collections.singleton(resultVariable));
this.resultVariable = resultVariable;
this.aggregatedColumn = aggregatedColumn;
this.aggregator = aggregator;
}
public int getAggregatedColumn() {
return this.aggregatedColumn;
}
public BoundAggregator getAggregator() {
return this.aggregator;
}
@Override
public Set<PVariable> getDeducedVariables() {
return Collections.singleton(resultVariable);
}
@Override
public Map<Set<PVariable>, Set<PVariable>> getFunctionalDependencies(IQueryMetaContext context) {
final Map<Set<PVariable>, Set<PVariable>> result = new HashMap<Set<PVariable>, Set<PVariable>>();
result.put(getDeferringVariables(), getDeducedVariables());
return result;
}
@Override
protected void doDoReplaceVariables(PVariable obsolete, PVariable replacement) {
if (resultVariable.equals(obsolete))
resultVariable = replacement;
}
@Override
protected Set<PVariable> getCandidateQuantifiedVariables() {
return actualParametersTuple.<PVariable> getDistinctElements();
}
@Override
protected String toStringRest() {
return query.getFullyQualifiedName() + "@" + actualParametersTuple.toString() + "->"
+ resultVariable.toString();
}
public PVariable getResultVariable() {
return resultVariable;
}
@Override
public Set<TypeJudgement> getImpliedJudgements(IQueryMetaContext context) {
Set<TypeJudgement> result = new HashSet<TypeJudgement>();
IInputKey aggregateResultType = aggregator.getAggregateResultTypeAsInputKey();
if (aggregateResultType != null) {
result.add(new TypeJudgement(aggregateResultType, Tuples.staticArityFlatTupleOf(resultVariable)));
}
return result;
}
}
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