com.hazelcast.query.impl

Class QueryContext

java.lang.Object

com.hazelcast.query.impl.QueryContext

Direct Known Subclasses:

GlobalQueryContextWithStats, PartitionQueryContextWithStats

public class QueryContext
extends Object

Provides the context for queries execution.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	QueryContext.IndexMatchHint Defines possible index matching hints.

Field Summary

Fields

Modifier and Type	Field and Description
protected Indexes	indexes
protected int	ownedPartitionCount

Constructor Summary

Constructors

Constructor and Description
QueryContext(Indexes indexes, int ownedPartitionCount) Creates a new query context with the given available indexes.

Method Summary

Modifier and Type	Method and Description
Index	getIndex(String attribute) Obtains the index available for the given attribute in this query context.
int	getOwnedPartitionCount()
Index	matchIndex(String pattern, QueryContext.IndexMatchHint matchHint) Matches an index for the given pattern and match hint.
void	setOwnedPartitionCount(int ownedPartitionCount) Sets owned partitions count a query runs on.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

indexes

protected Indexes indexes

ownedPartitionCount

protected int ownedPartitionCount

Constructor Detail

QueryContext

public QueryContext(Indexes indexes,
                    int ownedPartitionCount)

Creates a new query context with the given available indexes.

Parameters:

indexes - the indexes available for the query context.

Method Detail

getOwnedPartitionCount

public int getOwnedPartitionCount()

Returns:

a count of owned partitions a query runs on.

setOwnedPartitionCount

public void setOwnedPartitionCount(int ownedPartitionCount)

Sets owned partitions count a query runs on.

Parameters:

ownedPartitionCount - a count of owned partitions.

getIndex

public Index getIndex(String attribute)

Obtains the index available for the given attribute in this query context.

Parameters:

attribute - the attribute to obtain the index for.

Returns:

the obtained index or null if there is no index available for the given attribute.

matchIndex

public Index matchIndex(String pattern,
                        QueryContext.IndexMatchHint matchHint)

Matches an index for the given pattern and match hint.

Parameters:

pattern - the pattern to match an index for. May be either an attribute name or an exact index name. It's a caller's responsibility to canonicalize the passed pattern as specified by PredicateUtils.canonicalizeAttribute(java.lang.String) and Index.getName().

matchHint - the match hint.

Returns:

the matched index or null if nothing matched.

See Also:

QueryContext.IndexMatchHint