org.opt4j.core.common.archive
Class PopulationArchive

java.lang.Object
  org.opt4j.core.IndividualSet
      org.opt4j.core.optimizer.Archive
          org.opt4j.core.common.archive.AbstractArchive
              org.opt4j.core.common.archive.PopulationArchive

All Implemented Interfaces:

java.lang.Iterable<Individual>, java.util.Collection<Individual>, java.util.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

PopulationArchive()

Method Summary

boolean	update(java.util.Set<? extends Individual> individuals) Updates the archive with a set of individuals.
protected boolean	updateWithNondominated(java.util.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

addCheckedIndividual, addCheckedIndividuals, update

Methods inherited from class org.opt4j.core.IndividualSet

add, addAll, addAll, 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.Set

equals, hashCode

Constructor Detail

PopulationArchive

public PopulationArchive()

Method Detail

update

public boolean update(java.util.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(java.util.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