Packages

trait LazyCombiner[Elem, +To, Buff <: Growable[Elem] with Sizing] extends Combiner[Elem, To]

Implements combining contents of two combiners by postponing the operation until result method is called. It chains the leaf results together instead of evaluating the actual collection.

Elem

the type of the elements in the combiner

To

the type of the collection the combiner produces

Buff

the type of the buffers that contain leaf results and this combiner chains together

Source
LazyCombiner.scala
Linear Supertypes
Combiner[Elem, To], Parallel, Sizing, Builder[Elem, To], Growable[Elem], Clearable, AnyRef, Any
Known Subclasses
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Inherited
  1. LazyCombiner
  2. Combiner
  3. Parallel
  4. Sizing
  5. Builder
  6. Growable
  7. Clearable
  8. AnyRef
  9. Any
Implicitly
  1. by CollectionsHaveToParArray
  2. by any2stringadd
  3. by StringFormat
  4. by Ensuring
  5. by ArrowAssoc
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Visibility
  1. Public
  2. All

Abstract Value Members

  1. abstract def allocateAndCopy: To

    Method that allocates the data structure and copies elements into it using size and chain members.

  2. abstract val chain: ArrayBuffer[Buff]
  3. abstract def newLazyCombiner(buffchain: ArrayBuffer[Buff]): LazyCombiner[Elem, To, Buff]

Concrete Value Members

  1. def ++=(xs: TraversableOnce[Elem]): LazyCombiner.this.type

    adds all elements produced by a TraversableOnce to this growable collection.

    adds all elements produced by a TraversableOnce to this growable collection.

    xs

    the TraversableOnce producing the elements to add.

    returns

    the growable collection itself.

    Definition Classes
    Growable
  2. def +=(elem: Elem): LazyCombiner.this.type

    Adds a single element to the builder.

    Adds a single element to the builder.

    elem

    the element to be added.

    returns

    the builder itself.

    Definition Classes
    LazyCombinerBuilderGrowable
  3. def +=(elem1: Elem, elem2: Elem, elems: Elem*): LazyCombiner.this.type

    adds two or more elements to this growable collection.

    adds two or more elements to this growable collection.

    elem1

    the first element to add.

    elem2

    the second element to add.

    elems

    the remaining elements to add.

    returns

    the growable collection itself

    Definition Classes
    Growable
  4. val _combinerTaskSupport: TaskSupport
    Definition Classes
    Combiner
    Annotations
    @transient() @volatile()
  5. def canBeShared: Boolean

    Returns true if this combiner has a thread-safe += and is meant to be shared across several threads constructing the collection.

    Returns true if this combiner has a thread-safe += and is meant to be shared across several threads constructing the collection.

    By default, this method returns false.

    Definition Classes
    Combiner
  6. def clear(): Unit

    Clears the contents of this builder.

    Clears the contents of this builder. After execution of this method the builder will contain no elements.

    Definition Classes
    LazyCombinerBuilderGrowableClearable
  7. def combine[N <: Elem, NewTo >: To](other: Combiner[N, NewTo]): Combiner[N, NewTo]

    Combines the contents of the receiver builder and the other builder, producing a new builder containing both their elements.

    Combines the contents of the receiver builder and the other builder, producing a new builder containing both their elements.

    This method may combine the two builders by copying them into a larger collection, by producing a lazy view that gets evaluated once result is invoked, or use a merge operation specific to the data structure in question.

    Note that both the receiver builder and other builder become invalidated after the invocation of this method, and should be cleared (see clear) if they are to be used again.

    Also, combining two combiners c1 and c2 for which c1 eq c2 is true, that is, they are the same objects in memory:

    c1.combine(c2)

    always does nothing and returns c1.

    N

    the type of elements contained by the other builder

    NewTo

    the type of collection produced by the other builder

    other

    the other builder

    returns

    the parallel builder containing both the elements of this and the other builder

    Definition Classes
    LazyCombinerCombiner
  8. def combinerTaskSupport: TaskSupport
    Definition Classes
    Combiner
  9. def combinerTaskSupport_=(cts: TaskSupport): Unit
    Definition Classes
    Combiner
  10. val lastbuff: Buff
  11. def mapResult[NewTo](f: (To) ⇒ NewTo): Builder[Elem, NewTo]

    Creates a new builder by applying a transformation function to the results of this builder.

    Creates a new builder by applying a transformation function to the results of this builder.

    NewTo

    the type of collection returned by f.

    f

    the transformation function.

    returns

    a new builder which is the same as the current builder except that a transformation function is applied to this builder's result.

    Definition Classes
    Builder
    Note

    The original builder should no longer be used after mapResult is called.

  12. def result(): To

    Produces a collection from the added elements.

    Produces a collection from the added elements. This is a terminal operation: the builder's contents are undefined after this operation, and no further methods should be called.

    returns

    a collection containing the elements added to this builder.

    Definition Classes
    LazyCombinerBuilder
  13. def resultWithTaskSupport: To

    Constructs the result and sets the appropriate tasksupport object to the resulting collection if this is applicable.

    Constructs the result and sets the appropriate tasksupport object to the resulting collection if this is applicable.

    Definition Classes
    Combiner
  14. def size: Int
    Definition Classes
    LazyCombinerSizing
  15. def sizeHint(coll: TraversableLike[_, _], delta: Int): Unit

    Gives a hint that one expects the result of this builder to have the same size as the given collection, plus some delta.

    Gives a hint that one expects the result of this builder to have the same size as the given collection, plus some delta. This will provide a hint only if the collection is known to have a cheap size method. Currently this is assumed to be the case if and only if the collection is of type IndexedSeqLike. Some builder classes will optimize their representation based on the hint. However, builder implementations are still required to work correctly even if the hint is wrong, i.e. a different number of elements is added.

    coll

    the collection which serves as a hint for the result's size.

    delta

    a correction to add to the coll.size to produce the size hint.

    Definition Classes
    Builder
  16. def sizeHint(coll: TraversableLike[_, _]): Unit

    Gives a hint that one expects the result of this builder to have the same size as the given collection, plus some delta.

    Gives a hint that one expects the result of this builder to have the same size as the given collection, plus some delta. This will provide a hint only if the collection is known to have a cheap size method, which is determined by calling sizeHint.

    Some builder classes will optimize their representation based on the hint. However, builder implementations are still required to work correctly even if the hint is wrong, i.e. a different number of elements is added.

    coll

    the collection which serves as a hint for the result's size.

    Definition Classes
    Builder
  17. def sizeHint(size: Int): Unit

    Gives a hint how many elements are expected to be added when the next result is called.

    Gives a hint how many elements are expected to be added when the next result is called. Some builder classes will optimize their representation based on the hint. However, builder implementations are still required to work correctly even if the hint is wrong, i.e. a different number of elements is added.

    size

    the hint how many elements will be added.

    Definition Classes
    Builder
  18. def sizeHintBounded(size: Int, boundingColl: TraversableLike[_, _]): Unit

    Gives a hint how many elements are expected to be added when the next result is called, together with an upper bound given by the size of some other collection.

    Gives a hint how many elements are expected to be added when the next result is called, together with an upper bound given by the size of some other collection. Some builder classes will optimize their representation based on the hint. However, builder implementations are still required to work correctly even if the hint is wrong, i.e. a different number of elements is added.

    size

    the hint how many elements will be added.

    boundingColl

    the bounding collection. If it is an IndexedSeqLike, then sizes larger than collection's size are reduced.

    Definition Classes
    Builder
  19. def toParArray: ParArray[T]
    Implicit
    This member is added by an implicit conversion from LazyCombiner[Elem, To, Buff] to CollectionsHaveToParArray[LazyCombiner[Elem, To, Buff], T] performed by method CollectionsHaveToParArray in scala.collection.parallel. This conversion will take place only if an implicit value of type (LazyCombiner[Elem, To, Buff]) ⇒ GenTraversableOnce[T] is in scope.
    Definition Classes
    CollectionsHaveToParArray