com.espertech.esper.epl.lookup

Class SubordIndexedTableLookupStrategySinglePropUnique

java.lang.Object

com.espertech.esper.epl.lookup.SubordIndexedTableLookupStrategySinglePropUnique

All Implemented Interfaces:

SubordTableLookupStrategy

public class SubordIndexedTableLookupStrategySinglePropUnique
extends Object
implements SubordTableLookupStrategy

Index lookup strategy for subqueries.

Field Summary

Fields

Modifier and Type	Field and Description
protected PropertyIndexedEventTableSingleUnique	index Index to look up in.
protected int	keyStreamNum Stream numbers to get key values from.
protected EventPropertyGetter	propertyGetter Getters to use to get key values.
protected LookupStrategyDesc	strategyDesc

Constructor Summary

Constructors

Constructor and Description
SubordIndexedTableLookupStrategySinglePropUnique(int keyStreamNum, EventPropertyGetter propertyGetter, PropertyIndexedEventTableSingleUnique index, LookupStrategyDesc strategyDesc)

Method Summary

Modifier and Type	Method and Description
PropertyIndexedEventTableSingleUnique	getIndex() Returns index to look up in.
protected Object	getKey(EventBean[] eventsPerStream) 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()
String	toString()

Methods inherited from class java.lang.Object

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

Field Detail

keyStreamNum

protected final int keyStreamNum

Stream numbers to get key values from.

propertyGetter

protected final EventPropertyGetter propertyGetter

Getters to use to get key values.

index

protected final PropertyIndexedEventTableSingleUnique index

Index to look up in.

strategyDesc

protected final LookupStrategyDesc strategyDesc

Constructor Detail

SubordIndexedTableLookupStrategySinglePropUnique

public SubordIndexedTableLookupStrategySinglePropUnique(int keyStreamNum,
                                                        EventPropertyGetter propertyGetter,
                                                        PropertyIndexedEventTableSingleUnique index,
                                                        LookupStrategyDesc strategyDesc)

Method Detail

getIndex

public PropertyIndexedEventTableSingleUnique 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

getStrategyDesc

public LookupStrategyDesc getStrategyDesc()

Specified by:

getStrategyDesc in interface SubordTableLookupStrategy

getKey

protected Object getKey(EventBean[] eventsPerStream)

Get the index lookup keys.

Parameters:

eventsPerStream - is the events for each stream

Returns:

key object

toString

public String toString()

Overrides:

toString in class Object

toQueryPlan

public String toQueryPlan()

Specified by:

toQueryPlan in interface SubordTableLookupStrategy