Class MappedStreamDataSource<T, S>

constructor

• new MappedStreamDataSource<T, S>(
      mapFunc: (data: ITERATION_STATUS | T) => S,
      parent: IStreamDataSource<T>,
  ): MappedStreamDataSource<T, S>

  Type Parameters

  • T
  • S

  Parameters

  • mapFunc: (data: ITERATION_STATUS | T) => S
  • parent: IStreamDataSource<T>

  Returns MappedStreamDataSource<T, S>

inputDataSource

mapFunc

current

• current(): S

  returns the current element, returns the same element as the previous next call if there is no next before current called then we will call next as initial element

  Returns S

hasNext

• hasNext(): boolean

  Returns boolean

  true if additional data is present false if not

lookAhead

• lookAhead(cnt?: number): ITERATION_STATUS | S

  looks ahead cnt without changing the internal data "pointers" of the data source (this is mostly needed by possibly infinite constructs like lazy streams, because they do not know by definition their boundaries)

  Parameters

  • cnt: number = 1

    the elements to look ahead

  Returns ITERATION_STATUS | S

  either the element or ITERATION_STATUS.EO_STRM if we hit the end of the stream before finding the "cnt" element

next

• next(): S

  returns the next element in the stream

  Returns S

reset

• reset(): void

  resets the position to the beginning

  Returns void