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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.planner.cost.impl;
import java.util.Optional;
import tools.refinery.viatra.runtime.localsearch.planner.cost.IConstraintEvaluationContext;
import tools.refinery.viatra.runtime.matchers.context.IInputKey;
import tools.refinery.viatra.runtime.matchers.tuple.TupleMask;
import tools.refinery.viatra.runtime.matchers.util.Accuracy;
/**
* Cost function which calculates cost based on the cardinality of items in the runtime model, provided by the base indexer
*
* @author Grill Balázs
* @since 1.4
*/
public class IndexerBasedConstraintCostFunction extends StatisticsBasedConstraintCostFunction {
/**
*
*/
public IndexerBasedConstraintCostFunction() {
super();
}
/**
* @param inverseNavigationPenalty
* @since 2.1
*/
public IndexerBasedConstraintCostFunction(double inverseNavigationPenalty) {
super(inverseNavigationPenalty);
}
@Override
public Optional<Long> projectionSize(IConstraintEvaluationContext input, IInputKey supplierKey, TupleMask groupMask, Accuracy requiredAccuracy) {
return input.getRuntimeContext().estimateCardinality(supplierKey, groupMask, requiredAccuracy);
}
}
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