org.apache.lucene.search

Class BoostQuery



  • public final class BoostQuery
    extends Query
    A Query wrapper that allows to give a boost to the wrapped query. Boost values that are less than one will give less importance to this query compared to other ones while values that are greater than one will give more importance to the scores returned by this query.
    • Constructor Detail

      • BoostQuery

        public BoostQuery(Query query,
                          float boost)
        Sole constructor: wrap query in such a way that the produced scores will be boosted by boost.
    • Method Detail

      • getBoost

        public float getBoost()
        Return the applied boost.
      • equals

        public boolean equals(Object other)
        Description copied from class: Query
        Override and implement query instance equivalence properly in a subclass. This is required so that QueryCache works properly. Typically a query will be equal to another only if it's an instance of the same class and its document-filtering properties are identical that other instance. Utility methods are provided for certain repetitive code.
        Specified by:
        equals in class Query
        See Also:
        Query.sameClassAs(Object), Query.classHash()
      • rewrite

        public Query rewrite(IndexReader reader)
                      throws IOException
        Description copied from class: Query
        Expert: called to re-write queries into primitive queries. For example, a PrefixQuery will be rewritten into a BooleanQuery that consists of TermQuerys.
        Overrides:
        rewrite in class Query
        Throws:
        IOException
      • toString

        public String toString(String field)
        Description copied from class: Query
        Prints a query to a string, with field assumed to be the default field and omitted.
        Specified by:
        toString in class Query