Package org.apache.lucene.codecs

Class MappingMultiDocsEnum

  • public final class MappingMultiDocsEnum
extends DocsEnum
    Exposes flex API, merged from flex API of sub-segments, remapping docIDs (this is used for segment merging).

    • Constructor Detail

      • MappingMultiDocsEnum

        public MappingMultiDocsEnum()
        Sole constructor.

    • Method Detail

      • setMergeState

        public void setMergeState​(MergeState mergeState)
        Sets the MergeState, which is used to re-map document IDs.

      • getNumSubs

        public int getNumSubs()
        How many sub-readers we are merging.
        See Also:
        getSubs()

      • advance

        public int advance​(int target)
        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

      • nextDoc

        public int nextDoc()
            throws java.io.IOException
        Description copied from class: DocIdSetIterator
        Advances to the next document in the set and returns the doc it is currently on, or DocIdSetIterator.NO_MORE_DOCS if there are no more docs in the set.
        NOTE: after the iterator has exhausted you should not call this method, as it may result in unpredicted behavior.
        Specified by:
        nextDoc in class DocIdSetIterator
        Throws:
        java.io.IOException

      • 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