com.espertech.esper.epl.agg.access
Class AggregationAccessorMinMaxByBase

java.lang.Object
  com.espertech.esper.epl.agg.access.AggregationAccessorMinMaxByBase

All Implemented Interfaces:

AggregationAccessor

Direct Known Subclasses:

AggregationAccessorMinMaxByNonTable, AggregationAccessorMinMaxByTable

public abstract class AggregationAccessorMinMaxByBase
extends java.lang.Object
implements AggregationAccessor

Represents the aggregation accessor that provides the result for the "maxBy" aggregation function.

Constructor Summary

protected

AggregationAccessorMinMaxByBase(boolean max)

Method Summary

EventBean	getEnumerableEvent(AggregationState state, EventBean[] eventsPerStream, boolean isNewData, ExprEvaluatorContext exprEvaluatorContext) Return the aggregation state value consisting of a single event.
java.util.Collection<EventBean>	getEnumerableEvents(AggregationState state, EventBean[] eventsPerStream, boolean isNewData, ExprEvaluatorContext context) Return the aggregation state value consisting of a collection of events.
java.util.Collection<java.lang.Object>	getEnumerableScalar(AggregationState state, EventBean[] eventsPerStream, boolean isNewData, ExprEvaluatorContext exprEvaluatorContext) Return the aggregation state value consisting of a collection of scalar values.

Methods inherited from class java.lang.Object

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

Methods inherited from interface com.espertech.esper.epl.agg.access.AggregationAccessor

getValue

Constructor Detail

AggregationAccessorMinMaxByBase

protected AggregationAccessorMinMaxByBase(boolean max)

Method Detail

getEnumerableEvents

public java.util.Collection<EventBean> getEnumerableEvents(AggregationState state,
                                                           EventBean[] eventsPerStream,
                                                           boolean isNewData,
                                                           ExprEvaluatorContext context)

Description copied from interface: AggregationAccessor

Return the aggregation state value consisting of a collection of events.

Specified by:

getEnumerableEvents in interface AggregationAccessor

Parameters:

state - aggregation state, downcast as needed

eventsPerStream - events

isNewData - new-data indicator

context - eval context

Returns:

return collection of events or null or empty collection

getEnumerableScalar

public java.util.Collection<java.lang.Object> getEnumerableScalar(AggregationState state,
                                                                  EventBean[] eventsPerStream,
                                                                  boolean isNewData,
                                                                  ExprEvaluatorContext exprEvaluatorContext)

Description copied from interface: AggregationAccessor

Return the aggregation state value consisting of a collection of scalar values.

Specified by:

getEnumerableScalar in interface AggregationAccessor

Parameters:

state - aggregation state, downcast as needed

eventsPerStream - events

isNewData - new-data indicator

exprEvaluatorContext - eval context

Returns:

return collection of scalar or null or empty collection

getEnumerableEvent

public EventBean getEnumerableEvent(AggregationState state,
                                    EventBean[] eventsPerStream,
                                    boolean isNewData,
                                    ExprEvaluatorContext exprEvaluatorContext)

Description copied from interface: AggregationAccessor

Return the aggregation state value consisting of a single event.

Specified by:

getEnumerableEvent in interface AggregationAccessor

Parameters:

state - aggregation state, downcast as needed

eventsPerStream - events

isNewData - new-data indicator

exprEvaluatorContext - eval context

Returns:

return event or null