Package org.apache.lucene.search.spans
Class SpanMultiTermQueryWrapper<Q extends MultiTermQuery>
- java.lang.Object
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- org.apache.lucene.search.Query
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- org.apache.lucene.search.spans.SpanQuery
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- org.apache.lucene.search.spans.SpanMultiTermQueryWrapper<Q>
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public class SpanMultiTermQueryWrapper<Q extends MultiTermQuery> extends SpanQuery
Wraps anyMultiTermQuery
as aSpanQuery
, so it can be nested within other SpanQuery classes.The query is rewritten by default to a
SpanOrQuery
containing the expanded terms, but this can be customized.Example:
WildcardQuery wildcard = new WildcardQuery(new Term("field", "bro?n")); SpanQuery spanWildcard = new SpanMultiTermQueryWrapper<WildcardQuery>(wildcard); // do something with spanWildcard, such as use it in a SpanFirstQuery
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Nested Class Summary
Nested Classes Modifier and Type Class Description static class
SpanMultiTermQueryWrapper.SpanRewriteMethod
Abstract class that defines how the query is rewritten.static class
SpanMultiTermQueryWrapper.TopTermsSpanBooleanQueryRewrite
A rewrite method that first translates each term into a SpanTermQuery in aBooleanClause.Occur.SHOULD
clause in a BooleanQuery, and keeps the scores as computed by the query.
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Field Summary
Fields Modifier and Type Field Description protected Q
query
static SpanMultiTermQueryWrapper.SpanRewriteMethod
SCORING_SPAN_QUERY_REWRITE
A rewrite method that first translates each term into a SpanTermQuery in aBooleanClause.Occur.SHOULD
clause in a BooleanQuery, and keeps the scores as computed by the query.
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Constructor Summary
Constructors Constructor Description SpanMultiTermQueryWrapper(Q query)
Create a new SpanMultiTermQueryWrapper.
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description SpanWeight
createWeight(IndexSearcher searcher, boolean needsScores, float boost)
Expert: Constructs an appropriate Weight implementation for this query.boolean
equals(Object other)
Override and implement query instance equivalence properly in a subclass.String
getField()
Returns the name of the field matched by this query.SpanMultiTermQueryWrapper.SpanRewriteMethod
getRewriteMethod()
Expert: returns the rewriteMethodQuery
getWrappedQuery()
Returns the wrapped queryint
hashCode()
Override and implement query hash code properly in a subclass.Query
rewrite(IndexReader reader)
Expert: called to re-write queries into primitive queries.void
setRewriteMethod(SpanMultiTermQueryWrapper.SpanRewriteMethod rewriteMethod)
Expert: sets the rewrite method.String
toString(String field)
Prints a query to a string, withfield
assumed to be the default field and omitted.-
Methods inherited from class org.apache.lucene.search.spans.SpanQuery
getTermContexts, getTermContexts
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Methods inherited from class org.apache.lucene.search.Query
classHash, sameClassAs, toString
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Field Detail
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query
protected final Q extends MultiTermQuery query
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SCORING_SPAN_QUERY_REWRITE
public static final SpanMultiTermQueryWrapper.SpanRewriteMethod SCORING_SPAN_QUERY_REWRITE
A rewrite method that first translates each term into a SpanTermQuery in aBooleanClause.Occur.SHOULD
clause in a BooleanQuery, and keeps the scores as computed by the query.
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Constructor Detail
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SpanMultiTermQueryWrapper
public SpanMultiTermQueryWrapper(Q query)
Create a new SpanMultiTermQueryWrapper.- Parameters:
query
- Query to wrap.
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Method Detail
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getRewriteMethod
public final SpanMultiTermQueryWrapper.SpanRewriteMethod getRewriteMethod()
Expert: returns the rewriteMethod
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setRewriteMethod
public final void setRewriteMethod(SpanMultiTermQueryWrapper.SpanRewriteMethod rewriteMethod)
Expert: sets the rewrite method. This only makes sense to be a span rewrite method.
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getField
public String getField()
Description copied from class:SpanQuery
Returns the name of the field matched by this query.
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createWeight
public SpanWeight createWeight(IndexSearcher searcher, boolean needsScores, float boost) throws IOException
Description copied from class:Query
Expert: Constructs an appropriate Weight implementation for this query.Only implemented by primitive queries, which re-write to themselves.
- Specified by:
createWeight
in classSpanQuery
needsScores
- True if document scores (Scorer.score()
) are needed.boost
- The boost that is propagated by the parent queries.- Throws:
IOException
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getWrappedQuery
public Query getWrappedQuery()
Returns the wrapped query
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toString
public String toString(String field)
Description copied from class:Query
Prints a query to a string, withfield
assumed to be the default field and omitted.
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rewrite
public Query rewrite(IndexReader reader) throws IOException
Description copied from class:Query
Expert: called to re-write queries into primitive queries. For example, a PrefixQuery will be rewritten into a BooleanQuery that consists of TermQuerys.- Overrides:
rewrite
in classQuery
- Throws:
IOException
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hashCode
public int hashCode()
Description copied from class:Query
Override and implement query hash code properly in a subclass. This is required so thatQueryCache
works properly.- Specified by:
hashCode
in classQuery
- See Also:
Query.equals(Object)
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equals
public boolean equals(Object other)
Description copied from class:Query
Override and implement query instance equivalence properly in a subclass. This is required so thatQueryCache
works properly. Typically a query will be equal to another only if it's an instance of the same class and its document-filtering properties are identical that other instance. Utility methods are provided for certain repetitive code.- Specified by:
equals
in classQuery
- See Also:
Query.sameClassAs(Object)
,Query.classHash()
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