Package org.apache.lucene.search
Class ScoringRewrite<Q extends Query>
- java.lang.Object
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- org.apache.lucene.search.MultiTermQuery.RewriteMethod
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- org.apache.lucene.search.ScoringRewrite<Q>
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- All Implemented Interfaces:
Serializable
public abstract class ScoringRewrite<Q extends Query> extends MultiTermQuery.RewriteMethod
- See Also:
- Serialized Form
- NOTE: This API is for internal purposes only and might change in incompatible ways in the next release.
- Only public to be accessible by spans package.
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Field Summary
Fields Modifier and Type Field Description static MultiTermQuery.RewriteMethod
CONSTANT_SCORE_BOOLEAN_QUERY_REWRITE
LikeSCORING_BOOLEAN_QUERY_REWRITE
except scores are not computed.static ScoringRewrite<BooleanQuery>
SCORING_BOOLEAN_QUERY_REWRITE
A rewrite method that first translates each term intoBooleanClause.Occur.SHOULD
clause in a BooleanQuery, and keeps the scores as computed by the query.
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Constructor Summary
Constructors Constructor Description ScoringRewrite()
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Method Summary
All Methods Instance Methods Abstract Methods Concrete Methods Modifier and Type Method Description protected abstract void
addClause(Q topLevel, Term term, float boost)
Add a MultiTermQuery term to the top-level queryprotected void
collectTerms(IndexReader reader, MultiTermQuery query, org.apache.lucene.search.TermCollectingRewrite.TermCollector collector)
protected abstract Q
getTopLevelQuery()
Return a suitable top-level Query for holding all expanded terms.Q
rewrite(IndexReader reader, MultiTermQuery query)
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Methods inherited from class org.apache.lucene.search.MultiTermQuery.RewriteMethod
getTermsEnum
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Field Detail
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SCORING_BOOLEAN_QUERY_REWRITE
public static final ScoringRewrite<BooleanQuery> SCORING_BOOLEAN_QUERY_REWRITE
A rewrite method that first translates each term intoBooleanClause.Occur.SHOULD
clause in a BooleanQuery, and keeps the scores as computed by the query. Note that typically such scores are meaningless to the user, and require non-trivial CPU to compute, so it's almost always better to useMultiTermQuery.CONSTANT_SCORE_AUTO_REWRITE_DEFAULT
instead.NOTE: This rewrite method will hit
BooleanQuery.TooManyClauses
if the number of terms exceedsBooleanQuery.getMaxClauseCount()
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CONSTANT_SCORE_BOOLEAN_QUERY_REWRITE
public static final MultiTermQuery.RewriteMethod CONSTANT_SCORE_BOOLEAN_QUERY_REWRITE
LikeSCORING_BOOLEAN_QUERY_REWRITE
except scores are not computed. Instead, each matching document receives a constant score equal to the query's boost.NOTE: This rewrite method will hit
BooleanQuery.TooManyClauses
if the number of terms exceedsBooleanQuery.getMaxClauseCount()
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Method Detail
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rewrite
public Q rewrite(IndexReader reader, MultiTermQuery query) throws IOException
- Specified by:
rewrite
in classMultiTermQuery.RewriteMethod
- Throws:
IOException
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getTopLevelQuery
protected abstract Q getTopLevelQuery() throws IOException
Return a suitable top-level Query for holding all expanded terms.- Throws:
IOException
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addClause
protected abstract void addClause(Q topLevel, Term term, float boost) throws IOException
Add a MultiTermQuery term to the top-level query- Throws:
IOException
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collectTerms
protected final void collectTerms(IndexReader reader, MultiTermQuery query, org.apache.lucene.search.TermCollectingRewrite.TermCollector collector) throws IOException
- Throws:
IOException
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