public abstract class Query extends Object implements Serializable, Cloneable
Instantiable subclasses are:
TermQuery
MultiTermQuery
BooleanQuery
WildcardQuery
PhraseQuery
PrefixQuery
MultiPhraseQuery
FuzzyQuery
RangeQuery
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.
|
protected Weight |
createWeight(Searcher searcher)
Expert: Constructs an appropriate Weight implementation for this query.
|
void |
extractTerms(Set terms)
Expert: adds all terms occuring in this query to the terms set.
|
float |
getBoost()
Gets the boost for this clause.
|
Similarity |
getSimilarity(Searcher searcher)
Expert: Returns the Similarity implementation to be used for this query.
|
static Query |
mergeBooleanQueries(Query[] 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)
Expert: Constructs and initializes a Weight for a top-level query.
|
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:
protected Weight createWeight(Searcher searcher) throws IOException
Only implemented by primitive queries, which re-write to themselves.
IOException
public Weight weight(Searcher searcher) throws IOException
IOException
public Query rewrite(IndexReader reader) throws IOException
IOException
public Query combine(Query[] queries)
public void extractTerms(Set terms)
rewritten
form.UnsupportedOperationException
- if this query is not yet rewrittenpublic static Query mergeBooleanQueries(Query[] queries)
A utility for use by combine(Query[])
implementations.
public Similarity getSimilarity(Searcher searcher)
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