com.espertech.esper.epl.join.exec.base

Class IndexedTableLookupStrategy

java.lang.Object

com.espertech.esper.epl.join.exec.base.IndexedTableLookupStrategy

All Implemented Interfaces:

JoinExecTableLookupStrategy

public class IndexedTableLookupStrategy
extends Object
implements JoinExecTableLookupStrategy

Lookup on an index using a set of properties as key values.

Constructor Summary

Constructors

Constructor and Description
IndexedTableLookupStrategy(EventType eventType, String[] properties, PropertyIndexedEventTable index) Ctor.

Method Summary

Modifier and Type	Method and Description
EventType	getEventType() Returns event type of the lookup event.
PropertyIndexedEventTable	getIndex() Returns index to look up in.
String[]	getProperties() Returns properties to use from lookup event to look up in index.
LookupStrategyDesc	getStrategyDesc()
Set<EventBean>	lookup(EventBean theEvent, Cursor cursor, ExprEvaluatorContext exprEvaluatorContext) Returns matched events for a event to look up for.
String	toString()

Methods inherited from class java.lang.Object

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

Constructor Detail

IndexedTableLookupStrategy

public IndexedTableLookupStrategy(EventType eventType,
                                  String[] properties,
                                  PropertyIndexedEventTable index)

Ctor.

Parameters:

eventType - - event type to expect for lookup

properties - - key properties

index - - index to look up in

Method Detail

getEventType

public EventType getEventType()

Returns event type of the lookup event.

Returns:

event type of the lookup event

getProperties

public String[] getProperties()

Returns properties to use from lookup event to look up in index.

Returns:

properties to use from lookup event

getIndex

public PropertyIndexedEventTable getIndex()

Returns index to look up in.

Returns:

index to use

lookup

public Set<EventBean> lookup(EventBean theEvent,
                             Cursor cursor,
                             ExprEvaluatorContext exprEvaluatorContext)

Description copied from interface: JoinExecTableLookupStrategy

Returns matched events for a event to look up for. Never returns an empty result set, always returns null to indicate no results.

Specified by:

lookup in interface JoinExecTableLookupStrategy

Parameters:

theEvent - to look up

cursor - the path in the query that the lookup took

exprEvaluatorContext - expression evaluation context

Returns:

set of matching events, or null if none matching

toString

public String toString()

Overrides:

toString in class Object

getStrategyDesc

public LookupStrategyDesc getStrategyDesc()

Specified by:

getStrategyDesc in interface JoinExecTableLookupStrategy