com.espertech.esper.epl.lookup
Class SubordIndexedTableLookupStrategyExpr

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

All Implemented Interfaces:

SubordTableLookupStrategy

Direct Known Subclasses:

SubordIndexedTableLookupStrategyCoercing

public class SubordIndexedTableLookupStrategyExpr
extends java.lang.Object
implements SubordTableLookupStrategy

Index lookup strategy for subqueries.

Field Summary

protected ExprEvaluator[]	evaluators
protected PropertyIndexedEventTable	index Index to look up in.

Constructor Summary

SubordIndexedTableLookupStrategyExpr(int numStreamsOuter, ExprEvaluator[] evaluators, PropertyIndexedEventTable index, LookupStrategyDesc strategyDesc)
Ctor.

Method Summary

PropertyIndexedEventTable	getIndex() Returns index to look up in.
protected java.lang.Object[]	getKeys(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

index

protected final PropertyIndexedEventTable index

Index to look up in.

evaluators

protected final ExprEvaluator[] evaluators

Constructor Detail

SubordIndexedTableLookupStrategyExpr

public SubordIndexedTableLookupStrategyExpr(int numStreamsOuter,
                                            ExprEvaluator[] evaluators,
                                            PropertyIndexedEventTable index,
                                            LookupStrategyDesc strategyDesc)

Ctor.

Parameters:

index - is the table carrying the data to lookup into

Method Detail

getIndex

public PropertyIndexedEventTable 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

getKeys

protected java.lang.Object[] getKeys(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