Class FunctionQuery


  • public class FunctionQuery
    extends Query
    Returns a score for each document based on a ValueSource, often some function of the value of a field.
    See Also:
    ValueSourceScorer
    • Constructor Detail

      • FunctionQuery

        public FunctionQuery​(ValueSource func)
        Parameters:
        func - defines the function to be used for scoring
    • Method Detail

      • getValueSource

        public ValueSource getValueSource()
        Returns:
        The associated ValueSource
      • visit

        public void visit​(QueryVisitor visitor)
        Description copied from class: Query
        Recurse through the query tree, visiting any child queries
        Specified by:
        visit in class Query
        Parameters:
        visitor - a QueryVisitor to be called by each query in the tree
      • createWeight

        public Weight createWeight​(IndexSearcher searcher,
                                   ScoreMode scoreMode,
                                   float boost)
                            throws java.io.IOException
        Description copied from class: Query
        Expert: Constructs an appropriate Weight implementation for this query.

        Only implemented by primitive queries, which re-write to themselves.

        Overrides:
        createWeight in class Query
        scoreMode - How the produced scorers will be consumed.
        boost - The boost that is propagated by the parent queries.
        Throws:
        java.io.IOException
      • toString

        public java.lang.String toString​(java.lang.String field)
        Prints a user-readable version of this query.
        Specified by:
        toString in class Query
      • hashCode

        public int hashCode()
        Description copied from class: Query
        Override and implement query hash code properly in a subclass. This is required so that QueryCache works properly.
        Specified by:
        hashCode in class Query
        See Also:
        Query.equals(Object)