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

All Methods Instance Methods Concrete Methods
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 Detail
  - PopulationArchive
```
public PopulationArchive()
```
- Method Detail
  - 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