Class QueryUtils


  • public class QueryUtils
    extends Object
    • Constructor Summary

      Constructors 
      Constructor Description
      QueryUtils()  
    • Method Summary

      All Methods Static Methods Concrete Methods 
      Modifier and Type Method Description
      static org.apache.lucene.search.BooleanQuery build​(org.apache.lucene.search.BooleanQuery.Builder builder, QParser parser)  
      static org.apache.lucene.search.Query fixNegativeQuery​(org.apache.lucene.search.Query q)
      Fixes a negative query by adding a MatchAllDocs query clause.
      static org.apache.lucene.search.Query getAbs​(org.apache.lucene.search.Query q)
      Returns the original query if it was already a positive query, otherwise return the negative of the query (i.e., a positive query).
      static boolean isNegative​(org.apache.lucene.search.Query q)
      return true if this query has no positive components
      static org.apache.lucene.search.Query makeQueryable​(org.apache.lucene.search.Query q)
      Makes negative queries suitable for querying by lucene.
    • Constructor Detail

      • QueryUtils

        public QueryUtils()
    • Method Detail

      • isNegative

        public static boolean isNegative​(org.apache.lucene.search.Query q)
        return true if this query has no positive components
      • getAbs

        public static org.apache.lucene.search.Query getAbs​(org.apache.lucene.search.Query q)
        Returns the original query if it was already a positive query, otherwise return the negative of the query (i.e., a positive query).

        Example: both id:10 and id:-10 will return id:10

        The caller can tell the sign of the original by a reference comparison between the original and returned query.

        Parameters:
        q - Query to create the absolute version of
        Returns:
        Absolute version of the Query
      • makeQueryable

        public static org.apache.lucene.search.Query makeQueryable​(org.apache.lucene.search.Query q)
        Makes negative queries suitable for querying by lucene.
      • fixNegativeQuery

        public static org.apache.lucene.search.Query fixNegativeQuery​(org.apache.lucene.search.Query q)
        Fixes a negative query by adding a MatchAllDocs query clause. The query passed in *must* be a negative query.
      • build

        public static org.apache.lucene.search.BooleanQuery build​(org.apache.lucene.search.BooleanQuery.Builder builder,
                                                                  QParser parser)
        WARNING: This API is experimental and might change in incompatible ways in the next release.
        throw exception if max boolean clauses are exceeded