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/*******************************************************************************
* Copyright (c) 2010-2022, Tamas Szabo, GitHub
* 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.List;
import tools.refinery.viatra.runtime.matchers.psystem.EnumerablePConstraint;
import tools.refinery.viatra.runtime.matchers.psystem.IMultiQueryReference;
import tools.refinery.viatra.runtime.matchers.psystem.IRelationEvaluator;
import tools.refinery.viatra.runtime.matchers.psystem.PBody;
import tools.refinery.viatra.runtime.matchers.psystem.queries.PQuery;
import tools.refinery.viatra.runtime.matchers.tuple.Tuple;
/**
* A constraint which prescribes the evaluation of custom Java logic that takes an arbitrary number of input relations
* and produces one output relation. Contrast this to {@link ExpressionEvaluation}, which produces a single output value
* given an input tuple.
*
* The assumption is that the relation evaluation logic is not incremental, that is, it can only perform from-scratch
* computation of the output relation given the complete input relations. To this end, the relation evaluator always
* receives the complete input relations with all their contents as input. However, the evaluator engine makes sure that
* the output of the relation evaluation is at least "seemingly" incremental. This means that the underlying computation
* network computes the delta on the output compared to the previous output and only propagates the delta further.
*
* @author Tamas Szabo
*
* @since 2.8
*
*/
public class RelationEvaluation extends EnumerablePConstraint implements IMultiQueryReference {
private final IRelationEvaluator evaluator;
private final List<PQuery> inputQueries;
public RelationEvaluation(final PBody body, final Tuple variablesTuple, final List<PQuery> inputQueries,
final IRelationEvaluator evaluator) {
super(body, variablesTuple);
this.evaluator = evaluator;
this.inputQueries = inputQueries;
}
public IRelationEvaluator getEvaluator() {
return this.evaluator;
}
@Override
public List<PQuery> getReferredQueries() {
return this.inputQueries;
}
}
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