com.espertech.esper.epl.virtualdw

Class JoinExecTableLookupStrategyVirtualDW

java.lang.Object

com.espertech.esper.epl.virtualdw.JoinExecTableLookupStrategyVirtualDW

All Implemented Interfaces:

JoinExecTableLookupStrategy

public class JoinExecTableLookupStrategyVirtualDW
extends java.lang.Object
implements JoinExecTableLookupStrategy

Constructor Summary

Constructors

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

Method Summary

Modifier and Type	Method and Description
LookupStrategyDesc	getStrategyDesc()
java.util.Set<EventBean>	lookup(EventBean theEvent, Cursor cursor, ExprEvaluatorContext context) Returns matched events for a event 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

Constructor Detail

JoinExecTableLookupStrategyVirtualDW

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

Method Detail

lookup

public java.util.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 java.lang.String toQueryPlan()

getStrategyDesc

public LookupStrategyDesc getStrategyDesc()

Specified by:

getStrategyDesc in interface JoinExecTableLookupStrategy