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java.lang.Objectorg.apache.lucene.search.Query
The abstract base class for queries.
Instantiable subclasses are:
A parser for queries is contained in:
Constructor Summary | |
Query()
|
Method Summary | |
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. |
float |
getBoost()
Gets the boost for this clause. |
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 as the default field
for terms. |
Weight |
weight(Searcher searcher)
Expert: Constructs an initializes a Weight for a top-level query. |
Methods inherited from class java.lang.Object |
equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait |
Constructor Detail |
public Query()
Method Detail |
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
as the default field
for terms. The representation used is one that is readable by
QueryParser
(although, if the query was created by the parser, the printed
representation may not be exactly what was parsed).
public String toString()
protected Weight createWeight(Searcher searcher)
Only implemented by primitive queries, which re-write to themselves.
public Weight weight(Searcher searcher) throws IOException
IOException
public Query rewrite(IndexReader reader) throws IOException
IOException
public Query combine(Query[] queries)
Only implemented by derived queries, with no createWeight(Searcher)
implementatation..
public static Query mergeBooleanQueries(Query[] queries)
A utility for use by combine(Query[])
implementations.
public Object clone()
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