com.espertech.esper.epl.expression.time
Interface ExprTimePeriod

All Superinterfaces:

ExprNode, ExprValidator, MetaDefItem, java.io.Serializable

All Known Implementing Classes:

ExprTimePeriodImpl

public interface ExprTimePeriod
extends ExprNode

Expression representing a time period.

Child nodes to this expression carry the actual parts and must return a numeric value.

Method Summary

ExprTimePeriodEvalDeltaConst	constEvaluator(ExprEvaluatorContext context)
double	evaluateAsSeconds(EventBean[] eventsPerStream, boolean newData, ExprEvaluatorContext context)
TimePeriod	evaluateGetTimePeriod(EventBean[] eventsPerStream, boolean newData, ExprEvaluatorContext context)
boolean	hasVariable()
boolean	isConstantResult() Returns true if the expression node's evaluation value doesn't depend on any events data, as must be determined at validation time, which is bottom-up and therefore reliably allows each node to determine constant value.
boolean	isHasDay() Indicator whether the time period has a day part child expression.
boolean	isHasHour() Indicator whether the time period has a hour part child expression.
boolean	isHasMillisecond() Indicator whether the time period has a millisecond part child expression.
boolean	isHasMinute() Indicator whether the time period has a minute part child expression.
boolean	isHasMonth() Indicator whether the time period has a month part child expression.
boolean	isHasSecond() Indicator whether the time period has a second part child expression.
boolean	isHasWeek() Indicator whether the time period has a week part child expression.
boolean	isHasYear() Indicator whether the time period has a year part child expression.
ExprTimePeriodEvalDeltaNonConst	nonconstEvaluator()

Methods inherited from interface com.espertech.esper.epl.expression.core.ExprNode

accept, accept, acceptChildnodes, addChildNode, addChildNodes, equalsNode, getChildNodes, getExprEvaluator, getPrecedence, replaceUnlistedChildNode, setChildNode, setChildNodes, toEPL

Methods inherited from interface com.espertech.esper.epl.expression.core.ExprValidator

validate

Method Detail

hasVariable

boolean hasVariable()

constEvaluator

ExprTimePeriodEvalDeltaConst constEvaluator(ExprEvaluatorContext context)

nonconstEvaluator

ExprTimePeriodEvalDeltaNonConst nonconstEvaluator()

evaluateAsSeconds

double evaluateAsSeconds(EventBean[] eventsPerStream,
                         boolean newData,
                         ExprEvaluatorContext context)

evaluateGetTimePeriod

TimePeriod evaluateGetTimePeriod(EventBean[] eventsPerStream,
                                 boolean newData,
                                 ExprEvaluatorContext context)

isHasDay

boolean isHasDay()

Indicator whether the time period has a day part child expression.

Returns:

true for part present, false for not present

isHasHour

boolean isHasHour()

Indicator whether the time period has a hour part child expression.

Returns:

true for part present, false for not present

isHasMinute

boolean isHasMinute()

Indicator whether the time period has a minute part child expression.

Returns:

true for part present, false for not present

isHasSecond

boolean isHasSecond()

Indicator whether the time period has a second part child expression.

Returns:

true for part present, false for not present

isHasMillisecond

boolean isHasMillisecond()

Indicator whether the time period has a millisecond part child expression.

Returns:

true for part present, false for not present

isHasYear

boolean isHasYear()

Indicator whether the time period has a year part child expression.

Returns:

true for part present, false for not present

isHasMonth

boolean isHasMonth()

Indicator whether the time period has a month part child expression.

Returns:

true for part present, false for not present

isHasWeek

boolean isHasWeek()

Indicator whether the time period has a week part child expression.

Returns:

true for part present, false for not present

isConstantResult

boolean isConstantResult()

Description copied from interface: ExprNode

Returns true if the expression node's evaluation value doesn't depend on any events data, as must be determined at validation time, which is bottom-up and therefore reliably allows each node to determine constant value.

Specified by:

isConstantResult in interface ExprNode

Returns:

true for constant evaluation value, false for non-constant evaluation value