Package org.optaplanner.core.impl.heuristic.selector.value

## Class FromEntityPropertyValueSelector<Solution_>

- 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.FromEntityPropertyValueSelector<Solution_>

- Type Parameters:
    `Solution_` - the solution type, the class with the `PlanningSolution` annotation
  All Implemented Interfaces:
    `EventListener`, `Selector`, `ValueSelector`, `PhaseLifecycleListener`, `SolverLifecycleListener`

      public class FromEntityPropertyValueSelector<Solution_>
      extends AbstractValueSelector

  This is the common `ValueSelector` implementation.

- - ### Field Summary

    Fields
    Modifier and Type | Field | Description
    --- | --- | ---
    `protected boolean` | `randomSelection` |
    `protected ValueRangeDescriptor<Solution_>` | `valueRangeDescriptor` |
    `protected Solution_` | `workingSolution` |

    - ### Fields inherited from class org.optaplanner.core.impl.heuristic.selector.AbstractSelector

      `logger, phaseLifecycleSupport, workingRandom`

  - ### Constructor Summary

    Constructors
    Constructor | Description
    --- | ---
    `FromEntityPropertyValueSelector​(ValueRangeDescriptor<Solution_> valueRangeDescriptor, boolean randomSelection)` |

  - ### Method Summary

    All Methods Instance Methods Concrete Methods
    Modifier and Type | Method | Description
    --- | --- | ---
    `Iterator<Object>` | `endingIterator​(Object entity)` | If `Selector.isNeverEnding()` is true, then `ValueSelector.iterator(Object)` will never end.
    `long` | `getSize​(Object entity)` | Similar to `IterableSelector.getSize()`, but requires an entity.
    `GenuineVariableDescriptor<Solution_>` | `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.
    `void` | `phaseEnded​(AbstractPhaseScope phaseScope)` |
    `void` | `phaseStarted​(AbstractPhaseScope phaseScope)` |
    `String` | `toString()` |

    - ### Methods inherited from class org.optaplanner.core.impl.heuristic.selector.AbstractSelector

      `getCacheType, 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.phase.event.PhaseLifecycleListener

      `stepEnded, stepStarted`

    - ### Methods inherited from interface org.optaplanner.core.impl.heuristic.selector.Selector

      `getCacheType`

    - ### Methods inherited from interface org.optaplanner.core.impl.solver.event.SolverLifecycleListener

      `solvingEnded, solvingStarted`

- - ### Field Detail

    - #### valueRangeDescriptor

          protected final ValueRangeDescriptor<Solution_> valueRangeDescriptor

    - #### randomSelection

          protected final boolean randomSelection

    - #### workingSolution

          protected Solution_ workingSolution

  - ### Constructor Detail

    - #### FromEntityPropertyValueSelector

          public FromEntityPropertyValueSelector​(ValueRangeDescriptor<Solution_> valueRangeDescriptor,
                                                 boolean randomSelection)

  - ### Method Detail

    - #### getVariableDescriptor

          public GenuineVariableDescriptor<Solution_> getVariableDescriptor()

      Returns:
        never null

    - #### phaseStarted

          public void phaseStarted​(AbstractPhaseScope phaseScope)

      Specified by:
        `phaseStarted` in interface `PhaseLifecycleListener<Solution_>`
      Overrides:
        `phaseStarted` in class `AbstractSelector`

    - #### phaseEnded

          public void phaseEnded​(AbstractPhaseScope phaseScope)

      Specified by:
        `phaseEnded` in interface `PhaseLifecycleListener<Solution_>`
      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​(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

    - #### endingIterator

          public Iterator<Object> endingIterator​(Object entity)

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

    - #### toString

          public String toString()

      Overrides:
        `toString` in class `Object`