Class RoaringDocIdSet

All Implemented Interfaces:

public class RoaringDocIdSet extends DocIdSet
DocIdSet implementation inspired from

The space is divided into blocks of 2^16 bits and each block is encoded independently. In each block, if less than 2^12 bits are set, then documents are simply stored in a short[]. If more than 2^16-2^12 bits are set, then the inverse of the set is encoded in a simple short[]. Otherwise a FixedBitSet is used.

NOTE: This API is for internal purposes only and might change in incompatible ways in the next release.
  • Method Details

    • ramBytesUsed

      public long ramBytesUsed()
      Description copied from interface: Accountable
      Return the memory usage of this object in bytes. Negative values are illegal.
    • iterator

      public DocIdSetIterator iterator() throws IOException
      Description copied from class: DocIdSet
      Provides a DocIdSetIterator to access the set. This implementation can return null if there are no docs that match.
      Specified by:
      iterator in class DocIdSet
    • cardinality

      public int cardinality()
      Return the exact number of documents that are contained in this set.
    • toString

      public String toString()
      toString in class Object