public class CompletionWeight extends Weight
setNextMatch(IntsRef)
,
boost()
and context()
to calculate the boost and extract the context of
a matched path prefix.Weight.DefaultBulkScorer
parentQuery
Constructor and Description |
---|
CompletionWeight(CompletionQuery query,
Automaton automaton)
Creates a weight for
query with an automaton ,
using the reader for index stats |
Modifier and Type | Method and Description |
---|---|
protected float |
boost()
Returns the boost of the partial path set by
setNextMatch(IntsRef) |
BulkScorer |
bulkScorer(LeafReaderContext context)
Optional method, to return a
BulkScorer to
score the query and send hits to a Collector . |
protected CharSequence |
context()
Returns the context of the partial path set by
setNextMatch(IntsRef) |
Explanation |
explain(LeafReaderContext context,
int doc)
An explanation of the score computation for the named document.
|
void |
extractTerms(Set<Term> terms)
Expert: adds all terms occurring in this query to the terms set.
|
Automaton |
getAutomaton()
Returns the automaton specified
by the
CompletionQuery |
float |
getValueForNormalization()
The value for normalization of contained query clauses (e.g.
|
void |
normalize(float norm,
float topLevelBoost)
Assigns the query normalization factor and boost from parent queries to this.
|
Scorer |
scorer(LeafReaderContext context)
Returns a
Scorer which can iterate in order over all matching
documents and assign them a score. |
protected void |
setNextMatch(IntsRef pathPrefix)
Set for every partial path in the index that matched the query
automaton.
|
public CompletionWeight(CompletionQuery query, Automaton automaton) throws IOException
query
with an automaton
,
using the reader
for index statsIOException
public Automaton getAutomaton()
CompletionQuery
public BulkScorer bulkScorer(LeafReaderContext context) throws IOException
Weight
BulkScorer
to
score the query and send hits to a Collector
.
Only queries that have a different top-level approach
need to override this; the default implementation
pulls a normal Scorer
and iterates and
collects the resulting hits which are not marked as deleted.bulkScorer
in class Weight
context
- the LeafReaderContext
for which to return the Scorer
.BulkScorer
which scores documents and
passes them to a collector.IOException
- if there is a low-level I/O errorprotected void setNextMatch(IntsRef pathPrefix)
boost()
and context()
to return an appropriate value with respect to the current pathPrefix.pathPrefix
- the prefix of a matched pathprotected float boost()
setNextMatch(IntsRef)
protected CharSequence context()
setNextMatch(IntsRef)
public Scorer scorer(LeafReaderContext context) throws IOException
Weight
Scorer
which can iterate in order over all matching
documents and assign them a score.
NOTE: null can be returned if no documents will be scored by this query.
NOTE: The returned Scorer
does not have
LeafReader.getLiveDocs()
applied, they need to be checked on top.
scorer
in class Weight
context
- the LeafReaderContext
for which to return the Scorer
.Scorer
which scores documents in/out-of order.IOException
- if there is a low-level I/O errorpublic void extractTerms(Set<Term> terms)
Weight
Weight
was created with needsScores == true
then this
method will only extract terms which are used for scoring, otherwise it
will extract all terms which are used for matching.extractTerms
in class Weight
public Explanation explain(LeafReaderContext context, int doc) throws IOException
Weight
explain
in class Weight
context
- the readers context to create the Explanation
for.doc
- the document's id relative to the given context's readerIOException
- if an IOException
occurspublic float getValueForNormalization() throws IOException
Weight
getValueForNormalization
in class Weight
IOException
Copyright © 2000–2015 The Apache Software Foundation. All rights reserved.