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## org.optaplanner.core.impl.heuristic.selector.entity
Class FromSolutionEntitySelector

    java.lang.Object
      org.optaplanner.core.impl.heuristic.selector.AbstractSelector
          org.optaplanner.core.impl.heuristic.selector.entity.AbstractEntitySelector
              org.optaplanner.core.impl.heuristic.selector.entity.FromSolutionEntitySelector

All Implemented Interfaces:
  Iterable<Object>, EventListener, ListIterable<Object>, EntitySelector, IterableSelector<Object>, ListIterableSelector<Object>, Selector, PhaseLifecycleListener, SolverLifecycleListener

    public class FromSolutionEntitySelector

extends AbstractEntitySelector

This is the common `EntitySelector` implementation.

Field Summary
`protected List<Object>` | `cachedEntityList`
`protected boolean` | `cachedEntityListIsDirty`
`protected Long` | `cachedEntityListRevision`
`protected EntityDescriptor` | `entityDescriptor`
`protected SelectionCacheType` | `minimumCacheType`
`protected boolean` | `randomSelection`

Fields inherited from class org.optaplanner.core.impl.heuristic.selector.AbstractSelector
`logger, phaseLifecycleSupport, workingRandom`

Constructor Summary
`FromSolutionEntitySelector(EntityDescriptor entityDescriptor, SelectionCacheType minimumCacheType, boolean randomSelection)`

Method Summary
`Iterator<Object>` | `endingIterator()` If `Selector.isNeverEnding()` is true, then `Iterable.iterator()` will never end.
`SelectionCacheType` | `getCacheType()` Unless this selector itself caches, this returns `SelectionCacheType.JUST_IN_TIME`, even if a selector child caches.
`EntityDescriptor` | `getEntityDescriptor()`
`long` | `getSize()` A random JIT `Selector` with `Selector.isNeverEnding()` true should return a size as if it would be able to return each distinct element only once, because the size can be used in `SelectionProbabilityWeightFactory`.
`boolean` | `isCountable()` If false, then `Selector.isNeverEnding()` is true.
`boolean` | `isNeverEnding()` Is true if `Selector.isCountable()` is false or if this selector is in random order (for most cases).
`Iterator<Object>` | `iterator()`
`ListIterator<Object>` | `listIterator()` See `List.listIterator()`
`ListIterator<Object>` | `listIterator(int index)` See `List.listIterator()`
`void` | `phaseEnded(AbstractPhaseScope phaseScope)`
`void` | `phaseStarted(AbstractPhaseScope phaseScope)`
`void` | `stepStarted(AbstractStepScope stepScope)`
`String` | `toString()`

Methods inherited from class org.optaplanner.core.impl.heuristic.selector.AbstractSelector
`solvingEnded, solvingStarted, stepEnded`

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait`

Methods inherited from interface org.optaplanner.core.impl.phase.event.PhaseLifecycleListener
`stepEnded`

Methods inherited from interface org.optaplanner.core.impl.solver.event.SolverLifecycleListener
`solvingEnded, solvingStarted`

Field Detail

### entityDescriptor

    protected final EntityDescriptor entityDescriptor

### minimumCacheType

    protected final SelectionCacheType minimumCacheType

### randomSelection

    protected final boolean randomSelection

### cachedEntityList

    protected List<Object> cachedEntityList

### cachedEntityListRevision

    protected Long cachedEntityListRevision

### cachedEntityListIsDirty

    protected boolean cachedEntityListIsDirty

Constructor Detail

### FromSolutionEntitySelector

    public FromSolutionEntitySelector(EntityDescriptor entityDescriptor,
                                      SelectionCacheType minimumCacheType,
                                      boolean randomSelection)

Method Detail

### getEntityDescriptor

    public EntityDescriptor getEntityDescriptor()

  Returns:
    never null

### getCacheType

    public SelectionCacheType getCacheType()

  Description copied from interface: `Selector`
  Unless this selector itself caches, this returns `SelectionCacheType.JUST_IN_TIME`, even if a selector child caches.

  Specified by:
    `getCacheType` in interface `Selector`
  Overrides:
    `getCacheType` in class `AbstractSelector`
  Returns:
    never null, at least `SelectionCacheType.STEP`

### phaseStarted

    public void phaseStarted(AbstractPhaseScope phaseScope)

  Specified by:
    `phaseStarted` in interface `PhaseLifecycleListener`
  Overrides:
    `phaseStarted` in class `AbstractSelector`

### stepStarted

    public void stepStarted(AbstractStepScope stepScope)

  Specified by:
    `stepStarted` in interface `PhaseLifecycleListener`
  Overrides:
    `stepStarted` in class `AbstractSelector`

### phaseEnded

    public void phaseEnded(AbstractPhaseScope phaseScope)

  Specified by:
    `phaseEnded` in interface `PhaseLifecycleListener`
  Overrides:
    `phaseEnded` in class `AbstractSelector`

### isCountable

    public boolean isCountable()

  Description copied from interface: `Selector`
  If false, then `Selector.isNeverEnding()` is true.

  Returns:
    true if all the `ValueRange`s are countable (for example a double value range between 1.2 and 1.4 is not countable)

### isNeverEnding

    public boolean isNeverEnding()

  Description copied from interface: `Selector`
  Is true if `Selector.isCountable()` is false or if this selector is in random order (for most cases). Is never true when this selector is in shuffled order (which is less scalable but more exact).

  Returns:
    true if the `Iterator.hasNext()` of the `Iterator` created by `Iterable.iterator()` never returns false (except when it's empty).

### getSize

    public long getSize()

  Description copied from interface: `IterableSelector`
  A random JIT `Selector` with `Selector.isNeverEnding()` true should return a size as if it would be able to return each distinct element only once, because the size can be used in `SelectionProbabilityWeightFactory`.

  Returns:
    the approximate number of elements generated by this `Selector`, always >= 0

### iterator

    public Iterator<Object> iterator()

### listIterator

    public ListIterator<Object> listIterator()

  Description copied from interface: `ListIterable`
  See `List.listIterator()`

  Returns:
    never null, see `List.listIterator()`.

### listIterator

    public ListIterator<Object> listIterator(int index)

  Description copied from interface: `ListIterable`
  See `List.listIterator()`

  Parameters:
    `index` - lower than the size of this `ListIterable`, see `List.listIterator(int)`.
  Returns:
    never null, see `List.listIterator(int)`.

### endingIterator

    public Iterator<Object> endingIterator()

  Description copied from interface: `EntitySelector`
  If `Selector.isNeverEnding()` is true, then `Iterable.iterator()` will never end. This returns an ending `Iterator`, that tries to match `Iterable.iterator()` as much as possible, but return each distinct element only once and therefore it might not respect the configuration of this `EntitySelector` entirely.

  Returns:
    never null
  See Also:
    `Iterable.iterator()`

### toString

    public String toString()

  Overrides:
    `toString` in class `Object`

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| OptaPlanner distribution 6.1.0.CR1
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