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## org.optaplanner.core.impl.heuristic.selector.value.decorator
Class DowncastingValueSelector

    java.lang.Object
      org.optaplanner.core.impl.heuristic.selector.AbstractSelector
          org.optaplanner.core.impl.heuristic.selector.value.AbstractValueSelector
              org.optaplanner.core.impl.heuristic.selector.value.decorator.DowncastingValueSelector

All Implemented Interfaces:
  EventListener, Selector, ValueSelector, SolverPhaseLifecycleListener, SolverLifecycleListener

    public class DowncastingValueSelector

extends AbstractValueSelector

Field Summary
`protected ValueSelector` | `childValueSelector`
`protected Class<?>` | `downcastEntityClass`

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

Constructor Summary
`DowncastingValueSelector(ValueSelector childValueSelector, Class<?> downcastEntityClass)`

Method Summary
`ValueSelector` | `getChildValueSelector()`
`long` | `getSize(Object entity)` Similar to `IterableSelector.getSize()`, but requires an entity.
`GenuineVariableDescriptor` | `getVariableDescriptor()`
`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(Object entity)` Similar to `Iterable.iterator()`, but requires an entity.
`String` | `toString()`

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

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.heuristic.selector.Selector
`getCacheType`

Methods inherited from interface org.optaplanner.core.impl.phase.event.SolverPhaseLifecycleListener
`phaseEnded, phaseStarted, stepEnded, stepStarted`

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

Field Detail

### childValueSelector

    protected final ValueSelector childValueSelector

### downcastEntityClass

    protected final Class<?> downcastEntityClass

Constructor Detail

### DowncastingValueSelector

    public DowncastingValueSelector(ValueSelector childValueSelector,
                                    Class<?> downcastEntityClass)

Method Detail

### getChildValueSelector

    public ValueSelector getChildValueSelector()

### getVariableDescriptor

    public GenuineVariableDescriptor getVariableDescriptor()

  Returns:
    never null

### 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(Object entity)

  Description copied from interface: `ValueSelector`
  Similar to `IterableSelector.getSize()`, but requires an entity.

  Parameters:
    `entity` - never null
  Returns:
    the approximate number of elements generated by this `Selector`, always >= 0

### iterator

    public Iterator<Object> iterator(Object entity)

  Description copied from interface: `ValueSelector`
  Similar to `Iterable.iterator()`, but requires an entity.

  Parameters:
    `entity` - never null
  Returns:
    never null

### toString

    public String toString()

  Overrides:
    `toString` in class `Object`

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