Class TermSpans

  • public class TermSpans
    extends Spans
    Expert: Public for extension only. This does not work correctly for terms that indexed at position Integer.MAX_VALUE.
    • Field Detail

      • term

        protected final Term term
      • doc

        protected int doc
      • freq

        protected int freq
      • count

        protected int count
      • position

        protected int position
      • readPayload

        protected boolean readPayload
    • Method Detail

      • advance

        public int advance​(int target)
                    throws IOException
        Description copied from class: DocIdSetIterator
        Advances to the first beyond the current whose document number is greater than or equal to target, and returns the document number itself. Exhausts the iterator and returns DocIdSetIterator.NO_MORE_DOCS if target is greater than the highest document number in the set.

        The behavior of this method is undefined when called with target ≤ current, or after the iterator has exhausted. Both cases may result in unpredicted behavior.

        When target > current it behaves as if written:

         int advance(int target) {
           int doc;
           while ((doc = nextDoc()) < target) {
           return doc;
        Some implementations are considerably more efficient than that.

        NOTE: this method may be called with DocIdSetIterator.NO_MORE_DOCS for efficiency by some Scorers. If your implementation cannot efficiently determine that it should exhaust, it is recommended that you check for that value in each call to this method.

        Specified by:
        advance in class DocIdSetIterator
      • nextStartPosition

        public int nextStartPosition()
                              throws IOException
        Description copied from class: Spans
        Returns the next start position for the current doc. There is always at least one start/end position per doc. After the last start/end position at the current doc this returns Spans.NO_MORE_POSITIONS.
        Specified by:
        nextStartPosition in class Spans
      • endPosition

        public int endPosition()
        Description copied from class: Spans
        Returns the end position for the current start position, or -1 when Spans.nextStartPosition() was not yet called on the current doc. After the last start/end position at the current doc this returns Spans.NO_MORE_POSITIONS.
        Specified by:
        endPosition in class Spans
      • width

        public int width()
        Description copied from class: Spans
        Return the width of the match, which is typically used to compute the slop factor. It is only legal to call this method when the iterator is on a valid doc ID and positioned. The return value must be positive, and lower values means that the match is better.
        Specified by:
        width in class Spans
      • cost

        public long cost()
        Description copied from class: DocIdSetIterator
        Returns the estimated cost of this DocIdSetIterator.

        This is generally an upper bound of the number of documents this iterator might match, but may be a rough heuristic, hardcoded value, or otherwise completely inaccurate.

        Specified by:
        cost in class DocIdSetIterator
      • positionsCost

        public float positionsCost()
        Description copied from class: Spans
        Return an estimation of the cost of using the positions of this Spans for any single document, but only after Spans.asTwoPhaseIterator() returned null. Otherwise this method should not be called. The returned value is independent of the current document.
        Specified by:
        positionsCost in class Spans