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.
Methods inherited from class java.lang.Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
SubordTableLookupStrategyNullRow
public SubordTableLookupStrategyNullRow()
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
lookup
public java.util.Collection<EventBean> lookup(java.lang.Object[] keys)
- Specified by:
lookup
in interface SubordTableLookupStrategy
toQueryPlan
public java.lang.String toQueryPlan()
- Specified by:
toQueryPlan
in interface SubordTableLookupStrategy
getStrategyDesc
public LookupStrategyDesc getStrategyDesc()
- Specified by:
getStrategyDesc
in interface SubordTableLookupStrategy