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/*******************************************************************************
* Copyright (c) 2010-2014, Miklos Foldenyi, Andras Szabolcs Nagy, Abel Hegedus, Akos Horvath, Zoltan Ujhelyi 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 org.eclipse.viatra.dse.objectives.impl;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Objects;
import org.eclipse.viatra.dse.base.DesignSpaceManager;
import org.eclipse.viatra.dse.base.ThreadContext;
import org.eclipse.viatra.dse.designspace.api.TrajectoryInfo;
import org.eclipse.viatra.dse.objectives.ActivationFitnessProcessor;
import org.eclipse.viatra.dse.objectives.Comparators;
import org.eclipse.viatra.dse.objectives.IObjective;
import org.eclipse.viatra.query.runtime.matchers.util.Preconditions;
import org.eclipse.viatra.transformation.runtime.emf.rules.batch.BatchTransformationRule;
/**
* This soft objective calculates a fitness value based on the length of the trajectory. Costs to the rules can be
* assigned.
*
* @author Andras Szabolcs Nagy
*
*/
public class TrajectoryCostSoftObjective extends BaseObjective {
public static final String DEFAULT_NAME = "TrajectoryCostObjective";
protected Map<BatchTransformationRule<?, ?>, Double> fixCosts;
protected Map<BatchTransformationRule<?, ?>, ActivationFitnessProcessor> activationCostProcessors;
protected double trajectoryLengthWeight = 0.0;
protected boolean calculateTrajectoryLengthWeight;
public TrajectoryCostSoftObjective(String name) {
super(name);
comparator = Comparators.LOWER_IS_BETTER;
}
public TrajectoryCostSoftObjective() {
this(DEFAULT_NAME);
}
/**
* Sets the cost of a rule.
*
* @param rule
* @param cost
* @return The actual instance to enable builder pattern like usage.
*/
public TrajectoryCostSoftObjective withRuleCost(BatchTransformationRule<?, ?> rule, double cost) {
Objects.requireNonNull(rule);
if (fixCosts == null) {
fixCosts = new HashMap<BatchTransformationRule<?, ?>, Double>();
}
Preconditions.checkArgument(!fixCosts.containsKey(rule));
fixCosts.put(rule, cost);
return this;
}
/**
* Sets an activation processor for a rule.
*
* @param rule
* @param activationCostProcessor
* @return The actual instance to enable builder pattern like usage.
*/
public TrajectoryCostSoftObjective withActivationCost(BatchTransformationRule<?, ?> rule,
ActivationFitnessProcessor activationCostProcessor) {
Objects.requireNonNull(rule);
Objects.requireNonNull(activationCostProcessor);
if (activationCostProcessors == null) {
activationCostProcessors = new HashMap<BatchTransformationRule<?, ?>, ActivationFitnessProcessor>();
}
Preconditions.checkArgument(!activationCostProcessors.containsKey(rule));
activationCostProcessors.put(rule, activationCostProcessor);
return this;
}
/**
* The length of the trajectory multiplied with given parameter will be added to the fitness value.
*
* @param trajectoryLengthWeight
* The weight of a transformation rule application.
* @return The actual instance to enable builder pattern like usage.
*/
public TrajectoryCostSoftObjective withTrajectoryLengthWeight(double trajectoryLengthWeight) {
this.trajectoryLengthWeight = trajectoryLengthWeight;
this.calculateTrajectoryLengthWeight = true;
return this;
}
@Override
public Double getFitness(ThreadContext context) {
DesignSpaceManager dsm = context.getDesignSpaceManager();
TrajectoryInfo trajectoryInfo = dsm.getTrajectoryInfo();
List<Object> trajectory = trajectoryInfo.getTrajectory();
List<BatchTransformationRule<?, ?>> rules = trajectoryInfo.getRules();
double result = 0;
for (int i = 0; i < trajectory.size(); i++) {
BatchTransformationRule<?, ?> rule = rules.get(i);
Double cost = fixCosts.get(rule);
if (cost != null) {
result += cost;
}
Map<String, Double> costs = trajectoryInfo.getMeasuredCosts().get(i);
if (costs != null) {
cost = costs.get(name);
if (cost != null) {
result += cost;
}
}
}
if (calculateTrajectoryLengthWeight) {
result += trajectory.size() * trajectoryLengthWeight;
}
return result;
}
@Override
public void init(ThreadContext context) {
super.init(context);
DesignSpaceManager dsm = context.getDesignSpaceManager();
if (activationCostProcessors != null) {
for (Entry<BatchTransformationRule<?, ?>, ActivationFitnessProcessor> entry : activationCostProcessors.entrySet()) {
dsm.registerActivationCostProcessor(name, entry.getKey(), entry.getValue());
}
}
}
@Override
public IObjective createNew() {
return this;
}
}
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