com.espertech.esper.epl.virtualdw

Class JoinExecTableLookupStrategyVirtualDW

java.lang.Object

com.espertech.esper.epl.virtualdw.JoinExecTableLookupStrategyVirtualDW

All Implemented Interfaces:

JoinExecTableLookupStrategy

public class JoinExecTableLookupStrategyVirtualDW
extends Object
implements JoinExecTableLookupStrategy

Constructor Summary

Constructors

Constructor and Description
JoinExecTableLookupStrategyVirtualDW(String namedWindowName, VirtualDataWindowLookup externalIndex, TableLookupKeyDesc keyDescriptor, int lookupStream)

Method Summary

Modifier and Type	Method and Description
LookupStrategyDesc	getStrategyDesc()
Set<EventBean>	lookup(EventBean theEvent, Cursor cursor, ExprEvaluatorContext context) Returns matched events for a event to look up for.
String	toQueryPlan()

Methods inherited from class java.lang.Object

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

Constructor Detail

JoinExecTableLookupStrategyVirtualDW

public JoinExecTableLookupStrategyVirtualDW(String namedWindowName,
                                            VirtualDataWindowLookup externalIndex,
                                            TableLookupKeyDesc keyDescriptor,
                                            int lookupStream)

Method Detail

lookup

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

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

context - expression evaluation context

Returns:

set of matching events, or null if none matching

toQueryPlan

public String toQueryPlan()

getStrategyDesc

public LookupStrategyDesc getStrategyDesc()

Specified by:

getStrategyDesc in interface JoinExecTableLookupStrategy