org.apache.solr.search

Class QueryUtils

java.lang.Object

org.apache.solr.search.QueryUtils

public class QueryUtils
extends Object

Constructor Summary

Constructors

Constructor and Description
QueryUtils()

Method Summary

Modifier and Type	Method and Description
static BooleanQuery	build(BooleanQuery.Builder builder, QParser parser)
static Query	combineQueryAndFilter(Query scoreQuery, Query filterQuery) Combines a scoring query with a non-scoring (filter) query.
static Query	fixNegativeQuery(Query q) Fixes a negative query by adding a MatchAllDocs query clause.
static Query	getAbs(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(Query q) return true if this query has no positive components
static Query	makeQueryable(Query q) Makes negative queries suitable for querying by lucene.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

QueryUtils

public QueryUtils()

Method Detail

isNegative

public static boolean isNegative(Query q)

return true if this query has no positive components

getAbs

public static Query getAbs(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 Query makeQueryable(Query q)

Makes negative queries suitable for querying by lucene.

fixNegativeQuery

public static Query fixNegativeQuery(Query q)

Fixes a negative query by adding a MatchAllDocs query clause. The query passed in *must* be a negative query.

build

public static BooleanQuery build(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

combineQueryAndFilter

public static Query combineQueryAndFilter(Query scoreQuery,
                                          Query filterQuery)

Combines a scoring query with a non-scoring (filter) query. If both parameters are null then return a MatchAllDocsQuery. If only scoreQuery is present then return it. If only filterQuery is present then return it wrapped with constant scoring. If neither are null then we combine with a BooleanQuery.