org.apache.lucene.search

Class ConstantScoreQuery



  • public final class ConstantScoreQuery
    extends Query
    A query that wraps another query and simply returns a constant score equal to 1 for every document that matches the query. It therefore simply strips of all scores and always returns 1.
    • Constructor Detail

      • ConstantScoreQuery

        public ConstantScoreQuery(Query query)
        Strips off scores from the passed in Query. The hits will get a constant score of 1.
    • Method Detail

      • getQuery

        public Query getQuery()
        Returns the encapsulated query.
      • 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
      • 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()