public abstract class Query extends Object implements Serializable, Cloneable
Instantiable subclasses are:
TermQuery
MultiTermQuery
BooleanQuery
WildcardQuery
PhraseQuery
PrefixQuery
MultiPhraseQuery
FuzzyQuery
TermRangeQuery
NumericRangeQuery
SpanQuery
A parser for queries is contained in:
Constructor and Description |
---|
Query() |
Modifier and Type | Method and Description |
---|---|
Object |
clone()
Returns a clone of this query.
|
Query |
combine(Query[] queries)
Expert: called when re-writing queries under MultiSearcher.
|
Weight |
createWeight(Searcher searcher)
Expert: Constructs an appropriate Weight implementation for this query.
|
boolean |
equals(Object obj) |
void |
extractTerms(Set<Term> terms)
Expert: adds all terms occurring in this query to the terms set.
|
float |
getBoost()
Gets the boost for this clause.
|
Similarity |
getSimilarity(Searcher searcher)
Deprecated.
Instead of using "runtime" subclassing/delegation, subclass the Weight instead.
|
int |
hashCode() |
static Query |
mergeBooleanQueries(BooleanQuery... queries)
Expert: merges the clauses of a set of BooleanQuery's into a single
BooleanQuery.
|
Query |
rewrite(IndexReader reader)
Expert: called to re-write queries into primitive queries.
|
void |
setBoost(float b)
Sets the boost for this query clause to
b . |
String |
toString()
Prints a query to a string.
|
abstract String |
toString(String field)
Prints a query to a string, with
field assumed to be the
default field and omitted. |
Weight |
weight(Searcher searcher)
Deprecated.
never ever use this method in
Weight implementations.
Subclasses of Query should use createWeight(org.apache.lucene.search.Searcher) , instead. |
public void setBoost(float b)
b
. Documents
matching this clause will (in addition to the normal weightings) have
their score multiplied by b
.public float getBoost()
b
. The boost is 1.0 by default.public abstract String toString(String field)
field
assumed to be the
default field and omitted.
The representation used is one that is supposed to be readable
by QueryParser
. However,
there are the following limitations:
public Weight createWeight(Searcher searcher) throws IOException
Only implemented by primitive queries, which re-write to themselves.
IOException
@Deprecated public final Weight weight(Searcher searcher) throws IOException
Weight
implementations.
Subclasses of Query
should use createWeight(org.apache.lucene.search.Searcher)
, instead.IOException
public Query rewrite(IndexReader reader) throws IOException
IOException
public Query combine(Query[] queries)
public void extractTerms(Set<Term> terms)
rewritten
form.UnsupportedOperationException
- if this query is not yet rewrittenpublic static Query mergeBooleanQueries(BooleanQuery... queries)
A utility for use by combine(Query[])
implementations.
@Deprecated public Similarity getSimilarity(Searcher searcher)