org.apache.solr.search
Class QueryUtils

java.lang.Object
  org.apache.solr.search.QueryUtils

public class QueryUtils
extends Object

Constructor Summary

QueryUtils()

Method Summary

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.