com.espertech.esper.epl.lookup
Class SubordIndexedTableLookupStrategySingleExpr

java.lang.Object
  com.espertech.esper.epl.lookup.SubordIndexedTableLookupStrategySingleExpr

All Implemented Interfaces:

SubordTableLookupStrategy

Direct Known Subclasses:

SubordIndexedTableLookupStrategySingleCoercing

public class SubordIndexedTableLookupStrategySingleExpr
extends java.lang.Object
implements SubordTableLookupStrategy

Index lookup strategy for subqueries.

Field Summary

protected ExprEvaluator	evaluator Stream numbers to get key values from.
protected PropertyIndexedEventTableSingle	index Index to look up in.

Constructor Summary

SubordIndexedTableLookupStrategySingleExpr(int streamCountOuter, ExprEvaluator evaluator, PropertyIndexedEventTableSingle index, LookupStrategyDesc strategyDesc)

Method Summary

PropertyIndexedEventTableSingle	getIndex() Returns index to look up in.
protected java.lang.Object	getKey(EventBean[] eventsPerStream, ExprEvaluatorContext context) Get the index lookup keys.
LookupStrategyDesc	getStrategyDesc()
java.util.Collection<EventBean>	lookup(EventBean[] eventsPerStream, ExprEvaluatorContext context) Returns matched events for a set of events to look up for.
java.lang.String	toQueryPlan()

Methods inherited from class java.lang.Object

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

Field Detail

evaluator

protected final ExprEvaluator evaluator

Stream numbers to get key values from.

index

protected final PropertyIndexedEventTableSingle index

Index to look up in.

Constructor Detail

SubordIndexedTableLookupStrategySingleExpr

public SubordIndexedTableLookupStrategySingleExpr(int streamCountOuter,
                                                  ExprEvaluator evaluator,
                                                  PropertyIndexedEventTableSingle index,
                                                  LookupStrategyDesc strategyDesc)

Method Detail

getIndex

public PropertyIndexedEventTableSingle getIndex()

Returns index to look up in.

Returns:

index to use

lookup

public java.util.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

Returns:

set of matching events, or null if none matching

getKey

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

Get the index lookup keys.

Parameters:

eventsPerStream - is the events for each stream

Returns:

key object

getStrategyDesc

public LookupStrategyDesc getStrategyDesc()

Specified by:

getStrategyDesc in interface SubordTableLookupStrategy

toQueryPlan

public java.lang.String toQueryPlan()

Specified by:

toQueryPlan in interface SubordTableLookupStrategy