Package org.opt4j.common.archive

Class PopulationArchive

java.lang.Object

org.opt4j.core.IndividualSet

org.opt4j.core.optimizer.Archive

org.opt4j.common.archive.AbstractArchive

org.opt4j.common.archive.PopulationArchive

All Implemented Interfaces:

Iterable<Individual>, Collection<Individual>, Set<Individual>

public class PopulationArchive
extends AbstractArchive

The PopulationArchive keeps the non-dominated Individuals from the Population. It is assumed that the update(Set) method is called with the current Population in each iteration.

Field Summary

Fields inherited from class org.opt4j.core.IndividualSet

individuals, listeners

Constructor Summary

Constructors

Constructor	Description
PopulationArchive()

Method Summary

Modifier and Type	Method	Description
boolean	update(Set<? extends Individual> individuals)	Updates the archive with a set of individuals.
protected boolean	updateWithNondominated(Collection<Individual> candidates)	Adds new candidates which are already checked to be not Pareto-dominated by any other individual in this Archive.

Methods inherited from class org.opt4j.core.optimizer.Archive

add, addAll, addAll, addCheckedIndividual, addCheckedIndividuals, update

Methods inherited from class org.opt4j.core.IndividualSet

addListener, clear, contains, containsAll, isEmpty, iterator, remove, removeAll, removeListener, retainAll, size, toArray, toArray

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface java.util.Collection

parallelStream, removeIf, stream, toArray

Methods inherited from interface java.lang.Iterable

forEach

Methods inherited from interface java.util.Set

equals, hashCode, spliterator

Constructor Details

PopulationArchive

public PopulationArchive()

Method Details

update

public boolean update(Set<? extends Individual> individuals)

Description copied from class: Archive

Updates the archive with a set of individuals. Instead of the add /addAll methods, which are prohibited for the archive (throwing an UnsupportedOperationException), this method shall be used.

Overrides:

update in class AbstractArchive

Parameters:

individuals - the set of individuals that is used to update the archive

Returns:

returns true if the content of the archive changed

updateWithNondominated

protected boolean updateWithNondominated(Collection<Individual> candidates)

Description copied from class: AbstractArchive

Adds new candidates which are already checked to be not Pareto-dominated by any other individual in this Archive. All Individuals in the Archive which were dominated by the candidates have already been removed.

Specified by:

updateWithNondominated in class AbstractArchive

Parameters:

candidates - the non-dominated individuals which can be added

Returns:

true if one or more candidates are added to the archive