org.apache.uima.cas.impl

## Class LowLevelIterator_empty<T extends FeatureStructure>

- java.lang.Object
- - org.apache.uima.cas.impl.LowLevelIterator_empty<T>

- All Implemented Interfaces:
    Iterator<T>, ListIterator<T>, FSIterator<T>, LowLevelIterator<T>

      public class LowLevelIterator_empty<T extends FeatureStructure>
      extends Object
      implements LowLevelIterator<T>

  An empty Low-level FS iterator

- - ### Field Summary

    - ### Fields inherited from interface org.apache.uima.cas.impl.LowLevelIterator

      `FS_ITERATOR_LOW_LEVEL_EMPTY, IS_ORDERED`

  - ### Constructor Summary

    Constructors
    Constructor and Description
    `LowLevelIterator_empty()`

  - ### Method Summary

    All Methods Instance Methods Concrete Methods
    Modifier and Type | Method and Description
    --- | ---
    `LowLevelIterator_empty<T>` | `copy()` Copy this iterator.
    `Comparator<TOP>` | `getComparator()`
    `T` | `getNvc()` Get the structure the iterator is pointing at.
    `Type` | `getType()`
    `boolean` | `isIndexesHaveBeenUpdated()`
    `boolean` | `isValid()` Check if this iterator is valid.
    `LowLevelIndex<T>` | `ll_getIndex()` Get the index for just the top most type of this iterator (excludes subtypes).
    `int` | `ll_indexSizeMaybeNotCurrent()`
    `int` | `ll_maxAnnotSpan()`
    `boolean` | `maybeReinitIterator()` Internal use
    `void` | `moveToFirstNoReinit()` Internal use same as moveToFirst, but won't reset to use current contents of index if index has changed
    `void` | `moveToLastNoReinit()` Internal use same as moveToLast, but won't reset to use current contents of index if index has changed
    `void` | `moveToNextNvc()` version of moveToNext which bypasses the isValid check - call only if you've just done this check yourself
    `void` | `moveToNoReinit(FeatureStructure fs)` Internal use same as moveTo(fs), but won't reset to use current contents of index if index has changed
    `void` | `moveToPreviousNvc()` version of moveToPrevious which bypasses the isValid check - call only if you've just done this check yourself
    `int` | `size()` return the size of the collection being iterated over, if available.

    - ### Methods inherited from class java.lang.Object

      `clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

    - ### Methods inherited from interface org.apache.uima.cas.impl.LowLevelIterator

      `getArrayList, isMoveToSupported, ll_get, ll_remove, moveTo, moveTo, moveToFirst, moveToLast`

    - ### Methods inherited from interface org.apache.uima.cas.FSIterator

      `add, get, hasNext, hasPrevious, moveToNext, moveToPrevious, next, nextIndex, nextNvc, previous, previousIndex, previousNvc, remove, set, spliterator, stream`

    - ### Methods inherited from interface java.util.Iterator

      `forEachRemaining`

- - ### Constructor Detail

    - #### LowLevelIterator_empty

          public LowLevelIterator_empty()

  - ### Method Detail

    - #### isValid

          public boolean isValid()

      Description copied from interface: `FSIterator`
      Check if this iterator is valid.
      Specified by:
        `isValid` in interface `FSIterator<T extends FeatureStructure>`
      Returns:
        `true` if the iterator is valid.

    - #### getNvc

          public T getNvc()

      Description copied from interface: `FSIterator`
      Get the structure the iterator is pointing at. Throws various unchecked exceptions, if the iterator is not valid
      Specified by:
        `getNvc` in interface `FSIterator<T extends FeatureStructure>`
      Returns:
        The structure the iterator is pointing at.

    - #### moveToFirstNoReinit

          public void moveToFirstNoReinit()

      Description copied from interface: `LowLevelIterator`
      Internal use same as moveToFirst, but won't reset to use current contents of index if index has changed
      Specified by:
        `moveToFirstNoReinit` in interface `LowLevelIterator<T extends FeatureStructure>`

    - #### moveToLastNoReinit

          public void moveToLastNoReinit()

      Description copied from interface: `LowLevelIterator`
      Internal use same as moveToLast, but won't reset to use current contents of index if index has changed
      Specified by:
        `moveToLastNoReinit` in interface `LowLevelIterator<T extends FeatureStructure>`

    - #### moveToNoReinit

          public void moveToNoReinit(FeatureStructure fs)

      Description copied from interface: `LowLevelIterator`
      Internal use same as moveTo(fs), but won't reset to use current contents of index if index has changed
      Specified by:
        `moveToNoReinit` in interface `LowLevelIterator<T extends FeatureStructure>`
      Parameters:
        `fs` - the fs to use as the template identifying the place to move to

    - #### copy

          public LowLevelIterator_empty<T> copy()

      Description copied from interface: `FSIterator`
      Copy this iterator.
      Specified by:
        `copy` in interface `FSIterator<T extends FeatureStructure>`
      Returns:
        A copy of this iterator, pointing at the same element.

    - #### moveToNextNvc

          public void moveToNextNvc()

      Description copied from interface: `FSIterator`
      version of moveToNext which bypasses the isValid check - call only if you've just done this check yourself
      Specified by:
        `moveToNextNvc` in interface `FSIterator<T extends FeatureStructure>`

    - #### moveToPreviousNvc

          public void moveToPreviousNvc()

      Description copied from interface: `FSIterator`
      version of moveToPrevious which bypasses the isValid check - call only if you've just done this check yourself
      Specified by:
        `moveToPreviousNvc` in interface `FSIterator<T extends FeatureStructure>`

    - #### ll_indexSizeMaybeNotCurrent

          public int ll_indexSizeMaybeNotCurrent()

      Specified by:
        `ll_indexSizeMaybeNotCurrent` in interface `LowLevelIterator<T extends FeatureStructure>`
      Returns:
        The size of the index. In case of copy-on-write, this returns the size of the index at the time the iterator was created, or at the last moveTo, moveToFirst, or moveToLast. To get the current index size, use ll_getIndex().getSize()

    - #### ll_maxAnnotSpan

          public int ll_maxAnnotSpan()

      Specified by:
        `ll_maxAnnotSpan` in interface `LowLevelIterator<T extends FeatureStructure>`
      Returns:
        an estimate of the maximum span over all annotations (end - begin)

    - #### ll_getIndex

          public LowLevelIndex<T> ll_getIndex()

      Description copied from interface: `LowLevelIterator`
      Get the index for just the top most type of this iterator (excludes subtypes).
      Specified by:
        `ll_getIndex` in interface `LowLevelIterator<T extends FeatureStructure>`
      Returns:
        The index.

    - #### isIndexesHaveBeenUpdated

          public boolean isIndexesHaveBeenUpdated()

      Specified by:
        `isIndexesHaveBeenUpdated` in interface `LowLevelIterator<T extends FeatureStructure>`
      Returns:
        true if one or more of the underlying indexes this iterator goes over, has been updated since initialization or resetting operation (moveToFirst/Last/feature_structure). This includes empty iterators becoming non-empty.

    - #### maybeReinitIterator

          public boolean maybeReinitIterator()

      Description copied from interface: `LowLevelIterator`
      Internal use
      Specified by:
        `maybeReinitIterator` in interface `LowLevelIterator<T extends FeatureStructure>`
      Returns:
        true if the iterator was refreshed to match the current index

    - #### getComparator

          public Comparator<TOP> getComparator()

      Specified by:
        `getComparator` in interface `LowLevelIterator<T extends FeatureStructure>`
      Returns:
        the comparator used by this iterator. It is always a withoutID style, and may be either a withType or NoType style.

    - #### getType

          public Type getType()

      Specified by:
        `getType` in interface `FSIterator<T extends FeatureStructure>`
      Returns:
        the type this iterator is over

    - #### size

          public int size()

      Description copied from interface: `FSIterator`
      return the size of the collection being iterated over, if available. Because the iterator can move forwards and backwards, the size is the total size that the iterator would iterate over, starting at the first element thru the last element. This may be inefficient to compute.
      Specified by:
        `size` in interface `FSIterator<T extends FeatureStructure>`
      Returns:
        the size of the collection being iterated over.

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