Package com.espertech.esper.common.internal.epl.lookup

Class SubordHashedTableLookupStrategyExpr

java.lang.Object

com.espertech.esper.common.internal.epl.lookup.SubordHashedTableLookupStrategyExpr

All Implemented Interfaces:

SubordTableLookupStrategy

public class SubordHashedTableLookupStrategyExpr
extends Object
implements SubordTableLookupStrategy

Index lookup strategy for subqueries.

Field Summary

Fields inherited from interface com.espertech.esper.common.internal.epl.lookup.SubordTableLookupStrategy

EPTYPE

Constructor Summary

Constructors

Constructor	Description
SubordHashedTableLookupStrategyExpr(SubordHashedTableLookupStrategyExprFactory factory, PropertyHashedEventTable index)

Method Summary

Modifier and Type	Method	Description
PropertyHashedEventTable	getIndex()	Returns index to look up in.
protected Object	getKey(EventBean[] eventsPerStream, ExprEvaluatorContext context)	Get the index lookup keys.
LookupStrategyDesc	getStrategyDesc()
Collection<EventBean>	lookup(EventBean[] eventsPerStream, ExprEvaluatorContext context)	Returns matched events for a set of events to look up for.
String	toQueryPlan()

Methods inherited from class java.lang.Object

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

Constructor Details

SubordHashedTableLookupStrategyExpr

public SubordHashedTableLookupStrategyExpr(SubordHashedTableLookupStrategyExprFactory factory,
 PropertyHashedEventTable index)

Method Details

getIndex

public PropertyHashedEventTable getIndex()

Returns index to look up in.

Returns:

index to use

lookup

public Collection<EventBean> lookup(EventBean[] eventsPerStream,
 ExprEvaluatorContext context)

Description copied from interface: SubordTableLookupStrategy

Returns matched events for a set of events to look up for. Never returns an empty result set, always returns null to indicate no results.

Specified by:

lookup in interface SubordTableLookupStrategy

Parameters:

eventsPerStream - to look up

context - context

Returns:

set of matching events, or null if none matching

getKey

protected Object getKey(EventBean[] eventsPerStream,
 ExprEvaluatorContext context)

Get the index lookup keys.

Parameters:

eventsPerStream - is the events for each stream

context - context

Returns:

key object

getStrategyDesc

public LookupStrategyDesc getStrategyDesc()

Specified by:

getStrategyDesc in interface SubordTableLookupStrategy

toQueryPlan

public String toQueryPlan()

Specified by:

toQueryPlan in interface SubordTableLookupStrategy