public class QueryUtils extends Object
Constructor and Description |
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QueryUtils() |
Modifier and Type | Method and Description |
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static org.apache.lucene.search.Query |
fixNegativeQuery(org.apache.lucene.search.Query q)
Fixes a negative query by adding a MatchAllDocs query clause.
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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).
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static boolean |
isNegative(org.apache.lucene.search.Query q)
return true if this query has no positive components
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static org.apache.lucene.search.Query |
makeQueryable(org.apache.lucene.search.Query q)
Makes negative queries suitable for querying by
lucene.
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public static boolean isNegative(org.apache.lucene.search.Query q)
public static org.apache.lucene.search.Query getAbs(org.apache.lucene.search.Query q)
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.
q
- Query to create the absolute version ofpublic static org.apache.lucene.search.Query makeQueryable(org.apache.lucene.search.Query q)
public static org.apache.lucene.search.Query fixNegativeQuery(org.apache.lucene.search.Query q)