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/*******************************************************************************
* Copyright (c) 2010-2016, Grill Balázs, IncQuery Labs Ltd.
* 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.localsearch.operations.check;
import java.util.Collections;
import java.util.List;
import java.util.Objects;
import java.util.function.Function;
import java.util.stream.Stream;
import tools.refinery.viatra.runtime.localsearch.MatchingFrame;
import tools.refinery.viatra.runtime.localsearch.matcher.ISearchContext;
import tools.refinery.viatra.runtime.localsearch.operations.CheckOperationExecutor;
import tools.refinery.viatra.runtime.localsearch.operations.IPatternMatcherOperation;
import tools.refinery.viatra.runtime.localsearch.operations.ISearchOperation;
import tools.refinery.viatra.runtime.localsearch.operations.util.CallInformation;
import tools.refinery.viatra.runtime.matchers.backend.IQueryResultProvider;
import tools.refinery.viatra.runtime.matchers.psystem.aggregations.IMultisetAggregationOperator;
import tools.refinery.viatra.runtime.matchers.psystem.basicdeferred.AggregatorConstraint;
import tools.refinery.viatra.runtime.matchers.tuple.VolatileModifiableMaskedTuple;
/**
* Calculates the aggregated value of a column based on the given {@link AggregatorConstraint}
*
* @author Balázs Grill
* @since 1.4
* @noextend This class is not intended to be subclassed by clients.
*/
public class AggregatorCheck implements ISearchOperation, IPatternMatcherOperation {
private class Executor extends CheckOperationExecutor {
private final VolatileModifiableMaskedTuple maskedTuple;
private IQueryResultProvider matcher;
public Executor() {
super();
this.maskedTuple = new VolatileModifiableMaskedTuple(information.getThinFrameMask());
}
@Override
public void onInitialize(MatchingFrame frame, ISearchContext context) {
super.onInitialize(frame, context);
maskedTuple.updateTuple(frame);
matcher = context.getMatcher(information.getCallWithAdornment());
}
@Override
protected boolean check(MatchingFrame frame, ISearchContext context) {
IMultisetAggregationOperator<?, ?, ?> operator = aggregator.getAggregator().getOperator();
Object result = aggregate(operator, aggregator.getAggregatedColumn(), frame);
return result == null ? false : Objects.equals(frame.getValue(position), result);
}
@SuppressWarnings("unchecked")
private <Domain, Accumulator, AggregateResult> AggregateResult aggregate(
IMultisetAggregationOperator<Domain, Accumulator, AggregateResult> operator, int aggregatedColumn,
MatchingFrame initialFrame) {
maskedTuple.updateTuple(initialFrame);
final Stream<Domain> valueStream = matcher.getAllMatches(information.getParameterMask(), maskedTuple)
.map(match -> (Domain) match.get(aggregatedColumn));
return operator.aggregateStream(valueStream);
}
@Override
public ISearchOperation getOperation() {
return AggregatorCheck.this;
}
}
private final int position;
private final AggregatorConstraint aggregator;
private final CallInformation information;
/**
* @since 1.7
*/
public AggregatorCheck(CallInformation information, AggregatorConstraint aggregator, int position) {
super();
this.information = information;
this.position = position;
this.aggregator = aggregator;
}
@Override
public ISearchOperationExecutor createExecutor() {
return new Executor();
}
@Override
public List<Integer> getVariablePositions() {
return Collections.singletonList(position);
}
@Override
public String toString() {
return toString(Object::toString);
}
@Override
public String toString(Function<Integer, String> variableMapping) {
return "check "+variableMapping.apply(position)+" = " + aggregator.getAggregator().getOperator().getName() + " find " + information.toString(variableMapping);
}
@Override
public CallInformation getCallInformation() {
return information;
}
}
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