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## org.optaplanner.core.impl.heuristic.selector.value
Class FromSolutionPropertyValueSelector

    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.FromSolutionPropertyValueSelector

All Implemented Interfaces:
  Iterable<Object>, EventListener, SelectionCacheLifecycleListener, IterableSelector<Object>, Selector, EntityIndependentValueSelector, ValueSelector, SolverPhaseLifecycleListener, SolverLifecycleListener

    public class FromSolutionPropertyValueSelector

extends AbstractValueSelector
implements EntityIndependentValueSelector, SelectionCacheLifecycleListener

This is the common `ValueSelector` implementation.

Field Summary
`protected List<Object>` | `cachedValueList`
`protected SelectionCacheType` | `cacheType`
`protected boolean` | `randomSelection`
`protected PlanningVariableDescriptor` | `variableDescriptor`

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

Constructor Summary
`FromSolutionPropertyValueSelector(PlanningVariableDescriptor variableDescriptor, SelectionCacheType cacheType, boolean randomSelection)`

Method Summary
`void` | `constructCache(DefaultSolverScope solverScope)`
`void` | `disposeCache(DefaultSolverScope solverScope)`
`SelectionCacheType` | `getCacheType()` Unless this selector itself caches, this returns `SelectionCacheType.JUST_IN_TIME`, even if a selector child caches.
`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`.
`long` | `getSize(Object entity)` Similar to `IterableSelector.getSize()`, but requires an entity.
`PlanningVariableDescriptor` | `getVariableDescriptor()`
`boolean` | `isContinuous()` If true, then `Selector.isNeverEnding()` is also true.
`boolean` | `isNeverEnding()` Is true if `Selector.isContinuous()` is true or if this selector is in random order (for most cases).
`Iterator<Object>` | `iterator()`
`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
`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.phase.event.SolverPhaseLifecycleListener
`phaseEnded, phaseStarted, stepEnded, stepStarted`

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

Field Detail

### variableDescriptor

    protected final PlanningVariableDescriptor variableDescriptor

### cacheType

    protected final SelectionCacheType cacheType

### randomSelection

    protected final boolean randomSelection

### cachedValueList

    protected List<Object> cachedValueList

Constructor Detail

### FromSolutionPropertyValueSelector

    public FromSolutionPropertyValueSelector(PlanningVariableDescriptor variableDescriptor,
                                             SelectionCacheType cacheType,
                                             boolean randomSelection)

Method Detail

### getVariableDescriptor

    public PlanningVariableDescriptor getVariableDescriptor()

  Specified by:
    `getVariableDescriptor` in interface `ValueSelector`
  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

### constructCache

    public void constructCache(DefaultSolverScope solverScope)

  Specified by:
    `constructCache` in interface `SelectionCacheLifecycleListener`

### disposeCache

    public void disposeCache(DefaultSolverScope solverScope)

  Specified by:
    `disposeCache` in interface `SelectionCacheLifecycleListener`

### isContinuous

    public boolean isContinuous()

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

  Specified by:
    `isContinuous` in interface `Selector`
  Returns:
    true if any of the value ranges are continuous (as in for example every double value between 1.2 and 1.4)

### isNeverEnding

    public boolean isNeverEnding()

  Description copied from interface: `Selector`
  Is true if `Selector.isContinuous()` is true 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).

  Specified by:
    `isNeverEnding` in interface `Selector`
  Returns:
    true if the `Iterator.hasNext()` of the `Iterator` created by `Iterable.iterator()` never returns false.

### getSize

    public long getSize(Object entity)

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

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

### 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`.

  Specified by:
    `getSize` in interface `IterableSelector<Object>`
  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.

  Specified by:
    `iterator` in interface `ValueSelector`
  Parameters:
    `entity` - never null
  Returns:
    never null

### iterator

    public Iterator<Object> iterator()

  Specified by:
    `iterator` in interface `Iterable<Object>`

### toString

    public String toString()

  Overrides:
    `toString` in class `Object`

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