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.

Constructor Summary

Constructors

Constructor and Description
SubordHashedTableLookupStrategyExpr(SubordHashedTableLookupStrategyExprFactory factory, PropertyHashedEventTable index)

Method Summary

Modifier and Type	Method and 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 Detail

SubordHashedTableLookupStrategyExpr

public SubordHashedTableLookupStrategyExpr(SubordHashedTableLookupStrategyExprFactory factory,
                                           PropertyHashedEventTable index)

Method Detail

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