com.espertech.esper.epl.lookup

Class SubordIndexedTableLookupStrategyExprNW

java.lang.Object

com.espertech.esper.epl.lookup.SubordIndexedTableLookupStrategyExprNW

All Implemented Interfaces:

SubordTableLookupStrategy

Direct Known Subclasses:

SubordIndexedTableLookupStrategyCoercingNW

public class SubordIndexedTableLookupStrategyExprNW
extends Object
implements SubordTableLookupStrategy

Index lookup strategy for subqueries.

Field Summary

Fields

Modifier and Type	Field and Description
protected ExprEvaluator[]	evaluators
protected PropertyIndexedEventTable	index Index to look up in.
protected LookupStrategyDesc	strategyDesc

Constructor Summary

Constructors

Constructor and Description
SubordIndexedTableLookupStrategyExprNW(ExprEvaluator[] evaluators, PropertyIndexedEventTable index, LookupStrategyDesc strategyDesc)

Method Summary

Modifier and Type	Method and Description
PropertyIndexedEventTable	getIndex() Returns index to look up in.
protected Object[]	getKeys(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

Field Detail

index

protected final PropertyIndexedEventTable index

Index to look up in.

evaluators

protected final ExprEvaluator[] evaluators

strategyDesc

protected final LookupStrategyDesc strategyDesc

Constructor Detail

SubordIndexedTableLookupStrategyExprNW

public SubordIndexedTableLookupStrategyExprNW(ExprEvaluator[] evaluators,
                                              PropertyIndexedEventTable index,
                                              LookupStrategyDesc strategyDesc)

Method Detail

getIndex

public PropertyIndexedEventTable 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

getKeys

protected Object[] getKeys(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