com.espertech.esper.epl.core.eval
Class EvalBaseFirstProp

java.lang.Object
  com.espertech.esper.epl.core.eval.EvalBaseFirstProp

All Implemented Interfaces:

SelectExprProcessor

Direct Known Subclasses:

EvalInsertNoWildcardSingleColCoercionBean, EvalInsertNoWildcardSingleColCoercionBeanWrap, EvalInsertNoWildcardSingleColCoercionBeanWrapVariant, EvalInsertNoWildcardSingleColCoercionMapWrap, EvalInsertNoWildcardSingleColCoercionObjectArrayWrap, EvalInsertNoWildcardSingleColCoercionRevisionBean, EvalInsertNoWildcardSingleColCoercionRevisionBeanWrap, EvalInsertNoWildcardSingleColCoercionRevisionMap, EvalInsertNoWildcardSingleColCoercionRevisionObjectArray

public abstract class EvalBaseFirstProp
extends java.lang.Object
implements SelectExprProcessor

Constructor Summary

EvalBaseFirstProp(SelectExprContext selectExprContext, EventType resultEventType)

Method Summary

EventAdapterService	getEventAdapterService()
EventType	getResultEventType() Returns the event type that represents the select-clause items.
EventBean	process(EventBean[] eventsPerStream, boolean isNewData, boolean isSynthesize, ExprEvaluatorContext exprEvaluatorContext) Computes the select-clause results and returns an event of the result event type that contains, in it's properties, the selected items.
abstract EventBean	processFirstCol(java.lang.Object result)

Methods inherited from class java.lang.Object

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

Constructor Detail

EvalBaseFirstProp

public EvalBaseFirstProp(SelectExprContext selectExprContext,
                         EventType resultEventType)

Method Detail

processFirstCol

public abstract EventBean processFirstCol(java.lang.Object result)

process

public EventBean process(EventBean[] eventsPerStream,
                         boolean isNewData,
                         boolean isSynthesize,
                         ExprEvaluatorContext exprEvaluatorContext)

Description copied from interface: SelectExprProcessor

Computes the select-clause results and returns an event of the result event type that contains, in it's properties, the selected items.

Specified by:

process in interface SelectExprProcessor

Parameters:

eventsPerStream - - is per stream the event

isNewData - - indicates whether we are dealing with new data (istream) or old data (rstream)

isSynthesize - - set to true to indicate that synthetic events are required for an iterator result set

Returns:

event with properties containing selected items

getEventAdapterService

public EventAdapterService getEventAdapterService()

getResultEventType

public EventType getResultEventType()

Description copied from interface: SelectExprProcessor

Returns the event type that represents the select-clause items.

Specified by:

getResultEventType in interface SelectExprProcessor

Returns:

event type representing select-clause items