Package org.apache.lucene.index.sorter

Class NumericDocValuesSorter

  • public class NumericDocValuesSorter
extends Sorter
    A Sorter which sorts documents according to their NumericDocValues. One can specify ascending or descending sort order.

    • Constructor Detail

      • NumericDocValuesSorter

        public NumericDocValuesSorter​(String fieldName)
        Constructor over the given field name, and ascending sort order.

      • NumericDocValuesSorter

        public NumericDocValuesSorter​(String fieldName,
                              boolean ascending)
        Constructor over the given field name, and whether sorting should be ascending (true) or descending (false).

    • Method Detail

      • sort

        public Sorter.DocMap sort​(AtomicReader reader)
                   throws IOException
        Description copied from class: Sorter
        Returns a mapping from the old document ID to its new location in the sorted index. Implementations can use the auxiliary Sorter.sort(int, DocComparator) to compute the old-to-new permutation given a list of documents and their corresponding values.

        A return value of null is allowed and means that reader is already sorted.

        NOTE: deleted documents are expected to appear in the mapping as well, they will however be marked as deleted in the sorted view.

        Specified by:
        sort in class Sorter
        Throws:
        IOException

      • getID

        public String getID()
        Description copied from class: Sorter
        Returns the identifier of this Sorter.

        This identifier is similar to Object.hashCode() and should be chosen so that two instances of this class that sort documents likewise will have the same identifier. On the contrary, this identifier should be different on different sorters.

        Specified by:
        getID in class Sorter