org.apache.lucene.util

Class NotDocIdSet

  • All Implemented Interfaces:
    Accountable


    public final class NotDocIdSet
    extends DocIdSet
    This DocIdSet encodes the negation of another DocIdSet. It is cacheable and supports random-access if the underlying set is cacheable and supports random-access.
    • Method Detail

      • bits

        public Bits bits()
                  throws IOException
        Description copied from class: DocIdSet
        Optionally provides a Bits interface for random access to matching documents.
        Overrides:
        bits in class DocIdSet
        Returns:
        null, if this DocIdSet does not support random access. In contrast to DocIdSet.iterator(), a return value of null does not imply that no documents match the filter! The default implementation does not provide random access, so you only need to implement this method if your DocIdSet can guarantee random access to every docid in O(1) time without external disk access (as Bits interface cannot throw IOException). This is generally true for bit sets like FixedBitSet, which return itself if they are used as DocIdSet.
        Throws:
        IOException
      • ramBytesUsed

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