com.espertech.esper.epl.lookup
Class SubordTableLookupStrategyNullRow

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

All Implemented Interfaces:

SubordTableLookupStrategy

public class SubordTableLookupStrategyNullRow
extends java.lang.Object
implements SubordTableLookupStrategy

Implementation for a table lookup strategy that returns exactly one row but leaves that row as an undefined value.

Constructor Summary

SubordTableLookupStrategyNullRow()

Method Summary

LookupStrategyDesc	getStrategyDesc()
java.util.Set<EventBean>	lookup(EventBean[] events, 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

Constructor Detail

SubordTableLookupStrategyNullRow

public SubordTableLookupStrategyNullRow()

Method Detail

lookup

public java.util.Set<EventBean> lookup(EventBean[] events,
                                       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:

events - to look up

Returns:

set of matching events, or null if none matching

toQueryPlan

public java.lang.String toQueryPlan()

Specified by:

toQueryPlan in interface SubordTableLookupStrategy

getStrategyDesc

public LookupStrategyDesc getStrategyDesc()

Specified by:

getStrategyDesc in interface SubordTableLookupStrategy