net.sourceforge.cilib.algorithm.population.knowledgetransferstrategies.SelectiveKnowledgeTransferStrategy Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of cilib-library Show documentation

A library of composable components enabling simpler Computational Intelligence

There is a newer version: 0.8

/**           __  __
 *    _____ _/ /_/ /_    Computational Intelligence Library (CIlib)
 *   / ___/ / / / __ \   (c) CIRG @ UP
 *  / /__/ / / / /_/ /   http://cilib.net
 *  \___/_/_/_/_.___/
 */
package net.sourceforge.cilib.algorithm.population.knowledgetransferstrategies;

import java.util.List;
import net.sourceforge.cilib.algorithm.population.MultiPopulationBasedAlgorithm;
import net.sourceforge.cilib.algorithm.population.PopulationBasedAlgorithm;
import net.sourceforge.cilib.entity.Entity;
import net.sourceforge.cilib.type.types.Type;
import net.sourceforge.cilib.util.selection.recipes.ElitistSelector;
import net.sourceforge.cilib.util.selection.recipes.RingBasedPopulationSelector;
import net.sourceforge.cilib.util.selection.recipes.Selector;

/**
 * 
 * An implementation of {@link KnowledgeTransferStrategy} where two {@link Selection}
 * instances are used to first select a sub-population ({@link PopulationBasedAlgorithm}) from
 * a collection of population-based algorithms (see {@link MultiPopulationBasedAlgorithm) and then
 * within this sub-population's {@link Topology}, which entity's knowledge is to be transferred
 * to the caller requesting it.
 * 
 *
 */
public class SelectiveKnowledgeTransferStrategy implements KnowledgeTransferStrategy {

    private static final long serialVersionUID = 402688951924934682L;

    private Selector populationSelection;
    private Selector entitySelection;

    public SelectiveKnowledgeTransferStrategy() {
        this.populationSelection = new RingBasedPopulationSelector();
        this.entitySelection = new ElitistSelector();
    }

    public SelectiveKnowledgeTransferStrategy(SelectiveKnowledgeTransferStrategy copy) {
        this.populationSelection = copy.populationSelection;
        this.entitySelection = copy.entitySelection;
    }

    @Override
    public SelectiveKnowledgeTransferStrategy getClone() {
        return new SelectiveKnowledgeTransferStrategy(this);
    }

    public void setPopulationSelection(Selector populationSelection) {
        this.populationSelection = populationSelection;
    }

    public Selector getPopulationSelection() {
        return this.populationSelection;
    }

    public void setEntitySelection(Selector entitySelection) {
        this.entitySelection = entitySelection;
    }

    public Selector getEntitySelection() {
        return this.entitySelection;
    }

    @Override
    public Type transferKnowledge(List allPopulations) {
        PopulationBasedAlgorithm population = this.populationSelection.on(allPopulations).select();
        Entity entity = this.entitySelection.on((Iterable) population.getTopology()).select();
        return entity.getProperties();
    }
}