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## org.optaplanner.core.impl.heuristic.selector.value.chained
Class DefaultSubChainSelector

    java.lang.Object
      org.optaplanner.core.impl.heuristic.selector.AbstractSelector
          org.optaplanner.core.impl.heuristic.selector.value.chained.DefaultSubChainSelector

All Implemented Interfaces:
  Iterable<SubChain>, EventListener, ListIterable<SubChain>, SelectionCacheLifecycleListener, IterableSelector<SubChain>, ListIterableSelector<SubChain>, Selector, SubChainSelector, SolverPhaseLifecycleListener, SolverLifecycleListener

    public class DefaultSubChainSelector

extends AbstractSelector
implements SubChainSelector, SelectionCacheLifecycleListener

This is the common `SubChainSelector` implementation.

Field Summary
`protected List<SubChain>` | `anchorTrailingChainList`
`protected static SelectionCacheType` | `CACHE_TYPE`
`protected int` | `maximumSubChainSize`
`protected int` | `minimumSubChainSize`
`protected boolean` | `randomSelection`
`protected EntityIndependentValueSelector` | `valueSelector`

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

Constructor Summary
`DefaultSubChainSelector(EntityIndependentValueSelector valueSelector, boolean randomSelection, int minimumSubChainSize, int maximumSubChainSize)`

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`.
`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<SubChain>` | `iterator()`
`ListIterator<SubChain>` | `listIterator()` See `List.listIterator()`
`ListIterator<SubChain>` | `listIterator(int index)` See `List.listIterator()`
`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

### CACHE_TYPE

    protected static final SelectionCacheType CACHE_TYPE

### valueSelector

    protected final EntityIndependentValueSelector valueSelector

### randomSelection

    protected final boolean randomSelection

### minimumSubChainSize

    protected final int minimumSubChainSize

### maximumSubChainSize

    protected final int maximumSubChainSize

### anchorTrailingChainList

    protected List<SubChain> anchorTrailingChainList

Constructor Detail

### DefaultSubChainSelector

    public DefaultSubChainSelector(EntityIndependentValueSelector valueSelector,
                                   boolean randomSelection,
                                   int minimumSubChainSize,
                                   int maximumSubChainSize)

Method Detail

### getVariableDescriptor

    public PlanningVariableDescriptor getVariableDescriptor()

  Specified by:
    `getVariableDescriptor` in interface `SubChainSelector`
  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()

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

### iterator

    public Iterator<SubChain> iterator()

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

### listIterator

    public ListIterator<SubChain> listIterator()

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

  Specified by:
    `listIterator` in interface `ListIterable<SubChain>`
  Returns:
    never null, see `List.listIterator()`.

### listIterator

    public ListIterator<SubChain> listIterator(int index)

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

  Specified by:
    `listIterator` in interface `ListIterable<SubChain>`
  Parameters:
    `index` - lower than the size of this `ListIterable`, see `List.listIterator(int)`.
  Returns:
    never null, see `List.listIterator(int)`.

### toString

    public String toString()

  Overrides:
    `toString` in class `Object`

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