com.espertech.esper.common.client.hook.aggmultifunc

Interface AggregationMultiFunctionAggregationMethod

public interface AggregationMultiFunctionAggregationMethod

Aggregation method that operates on aggregation multi-function state such as provided by a multi-function aggregation (standalone or table column).

Field Summary

Fields

Modifier and Type	Field and Description
static EPTypeClass	EPTYPE Type information.

Method Summary

Modifier and Type	Method and Description
java.lang.Object	getValue(int aggColNum, com.espertech.esper.common.internal.epl.agg.core.AggregationRow row, EventBean[] eventsPerStream, boolean isNewData, com.espertech.esper.common.internal.epl.expression.core.ExprEvaluatorContext exprEvaluatorContext) Returns the plain value
default java.util.Collection	getValueCollectionEvents(int aggColNum, com.espertech.esper.common.internal.epl.agg.core.AggregationRow row, EventBean[] eventsPerStream, boolean isNewData, com.espertech.esper.common.internal.epl.expression.core.ExprEvaluatorContext exprEvaluatorContext) Return a collection of events or null when not available.
default java.util.Collection	getValueCollectionScalar(int aggColNum, com.espertech.esper.common.internal.epl.agg.core.AggregationRow row, EventBean[] eventsPerStream, boolean isNewData, com.espertech.esper.common.internal.epl.expression.core.ExprEvaluatorContext exprEvaluatorContext) Return a collection of values or null when not available.
default EventBean	getValueEventBean(int aggColNum, com.espertech.esper.common.internal.epl.agg.core.AggregationRow row, EventBean[] eventsPerStream, boolean isNewData, com.espertech.esper.common.internal.epl.expression.core.ExprEvaluatorContext exprEvaluatorContext) Returns a single event or null when not available.

Field Detail

EPTYPE

static final EPTypeClass EPTYPE

Type information.

Method Detail

getValue

java.lang.Object getValue(int aggColNum,
                          com.espertech.esper.common.internal.epl.agg.core.AggregationRow row,
                          EventBean[] eventsPerStream,
                          boolean isNewData,
                          com.espertech.esper.common.internal.epl.expression.core.ExprEvaluatorContext exprEvaluatorContext)

Returns the plain value

Parameters:

aggColNum - column number

row - aggregation row

eventsPerStream - events

isNewData - new-data flag

exprEvaluatorContext - evaluation context

Returns:

value

getValueCollectionEvents

default java.util.Collection getValueCollectionEvents(int aggColNum,
                                                      com.espertech.esper.common.internal.epl.agg.core.AggregationRow row,
                                                      EventBean[] eventsPerStream,
                                                      boolean isNewData,
                                                      com.espertech.esper.common.internal.epl.expression.core.ExprEvaluatorContext exprEvaluatorContext)

Return a collection of events or null when not available. The EPChainableType returned by the handler indicates whether the compiler allows operations on events.

Parameters:

aggColNum - column number

row - aggregation row

eventsPerStream - events

isNewData - new-data flag

exprEvaluatorContext - evaluation context

Returns:

collection of EventBean

getValueCollectionScalar

default java.util.Collection getValueCollectionScalar(int aggColNum,
                                                      com.espertech.esper.common.internal.epl.agg.core.AggregationRow row,
                                                      EventBean[] eventsPerStream,
                                                      boolean isNewData,
                                                      com.espertech.esper.common.internal.epl.expression.core.ExprEvaluatorContext exprEvaluatorContext)

Return a collection of values or null when not available. The EPChainableType returned by the handler indicates whether the compiler allows operations on events.

Parameters:

aggColNum - column number

row - aggregation row

eventsPerStream - events

isNewData - new-data flag

exprEvaluatorContext - evaluation context

Returns:

collection of values

getValueEventBean

default EventBean getValueEventBean(int aggColNum,
                                    com.espertech.esper.common.internal.epl.agg.core.AggregationRow row,
                                    EventBean[] eventsPerStream,
                                    boolean isNewData,
                                    com.espertech.esper.common.internal.epl.expression.core.ExprEvaluatorContext exprEvaluatorContext)

Returns a single event or null when not available. The EPChainableType returned by the handler indicates whether the compiler allows operations on events.

Parameters:

aggColNum - column number

row - aggregation row

eventsPerStream - events

isNewData - new-data flag

exprEvaluatorContext - evaluation context

Returns:

event