com.espertech.esper.epl.expression.time
Class ExprTimePeriodImpl

java.lang.Object
  com.espertech.esper.epl.expression.core.ExprNodeBase
      com.espertech.esper.epl.expression.time.ExprTimePeriodImpl

All Implemented Interfaces:

ExprEvaluator, ExprNode, ExprValidator, ExprTimePeriod, MetaDefItem, java.io.Serializable

public class ExprTimePeriodImpl
extends ExprNodeBase
implements ExprTimePeriod, ExprEvaluator

Expression representing a time period.

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

See Also:

Serialized Form

Nested Class Summary

static interface	ExprTimePeriodImpl.TimePeriodAdder
static class	ExprTimePeriodImpl.TimePeriodAdderDay
static class	ExprTimePeriodImpl.TimePeriodAdderHour
static class	ExprTimePeriodImpl.TimePeriodAdderMinute
static class	ExprTimePeriodImpl.TimePeriodAdderMonth
static class	ExprTimePeriodImpl.TimePeriodAdderMSec
static class	ExprTimePeriodImpl.TimePeriodAdderSecond
static class	ExprTimePeriodImpl.TimePeriodAdderWeek
static class	ExprTimePeriodImpl.TimePeriodAdderYear

Constructor Summary

ExprTimePeriodImpl(boolean hasYear, boolean hasMonth, boolean hasWeek, boolean hasDay, boolean hasHour, boolean hasMinute, boolean hasSecond, boolean hasMillisecond)
Ctor.

Method Summary

ExprTimePeriodEvalDeltaConst	constEvaluator(ExprEvaluatorContext context)
boolean	equalsNode(ExprNode node) Return true if a expression node semantically equals the current node, or false if not.
java.lang.Object	evaluate(EventBean[] eventsPerStream, boolean isNewData, ExprEvaluatorContext context) Evaluate event tuple and return result.
double	evaluateAsSeconds(EventBean[] eventsPerStream, boolean newData, ExprEvaluatorContext context)
TimePeriod	evaluateGetTimePeriod(EventBean[] eventsPerStream, boolean newData, ExprEvaluatorContext context)
protected ExprTimePeriodImpl.TimePeriodAdder[]	getAdders()
ExprEvaluator[]	getEvaluators()
ExprEvaluator	getExprEvaluator()
ExprPrecedenceEnum	getPrecedence() Returns precedence.
java.lang.Class	getType() Returns the type that the node's evaluate method returns an instance of.
boolean	hasVariable() Indicator whether the time period has a variable in any of the child expressions.
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()
void	toPrecedenceFreeEPL(java.io.StringWriter writer)
ExprNode	validate(ExprValidationContext validationContext)

Methods inherited from class com.espertech.esper.epl.expression.core.ExprNodeBase

accept, accept, acceptChildnodes, addChildNode, addChildNodes, addChildNodeToFront, getChildNodes, replaceUnlistedChildNode, setChildNode, setChildNodes, toEPL

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.expression.core.ExprNode

accept, accept, acceptChildnodes, addChildNode, addChildNodes, getChildNodes, replaceUnlistedChildNode, setChildNode, setChildNodes, toEPL

Constructor Detail

ExprTimePeriodImpl

public ExprTimePeriodImpl(boolean hasYear,
                          boolean hasMonth,
                          boolean hasWeek,
                          boolean hasDay,
                          boolean hasHour,
                          boolean hasMinute,
                          boolean hasSecond,
                          boolean hasMillisecond)

Ctor.

Parameters:

hasDay - true if the expression has that part, false if not

hasHour - true if the expression has that part, false if not

hasMinute - true if the expression has that part, false if not

hasSecond - true if the expression has that part, false if not

hasMillisecond - true if the expression has that part, false if not

Method Detail

constEvaluator

public ExprTimePeriodEvalDeltaConst constEvaluator(ExprEvaluatorContext context)

Specified by:

constEvaluator in interface ExprTimePeriod

nonconstEvaluator

public ExprTimePeriodEvalDeltaNonConst nonconstEvaluator()

Specified by:

nonconstEvaluator in interface ExprTimePeriod

getExprEvaluator

public ExprEvaluator getExprEvaluator()

Specified by:

getExprEvaluator in interface ExprNode

evaluate

public java.lang.Object evaluate(EventBean[] eventsPerStream,
                                 boolean isNewData,
                                 ExprEvaluatorContext context)

Description copied from interface: ExprEvaluator

Evaluate event tuple and return result.

Specified by:

evaluate in interface ExprEvaluator

Parameters:

eventsPerStream - - event tuple

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

context - context for expression evaluation

Returns:

evaluation result, a boolean value for OR/AND-type evalution nodes.

getAdders

protected ExprTimePeriodImpl.TimePeriodAdder[] getAdders()

getEvaluators

public ExprEvaluator[] getEvaluators()

isHasDay

public boolean isHasDay()

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

Specified by:

isHasDay in interface ExprTimePeriod

Returns:

true for part present, false for not present

isHasHour

public boolean isHasHour()

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

Specified by:

isHasHour in interface ExprTimePeriod

Returns:

true for part present, false for not present

isHasMinute

public boolean isHasMinute()

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

Specified by:

isHasMinute in interface ExprTimePeriod

Returns:

true for part present, false for not present

isHasSecond

public boolean isHasSecond()

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

Specified by:

isHasSecond in interface ExprTimePeriod

Returns:

true for part present, false for not present

isHasMillisecond

public boolean isHasMillisecond()

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

Specified by:

isHasMillisecond in interface ExprTimePeriod

Returns:

true for part present, false for not present

isHasYear

public boolean isHasYear()

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

Specified by:

isHasYear in interface ExprTimePeriod

Returns:

true for part present, false for not present

isHasMonth

public boolean isHasMonth()

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

Specified by:

isHasMonth in interface ExprTimePeriod

Returns:

true for part present, false for not present

isHasWeek

public boolean isHasWeek()

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

Specified by:

isHasWeek in interface ExprTimePeriod

Returns:

true for part present, false for not present

hasVariable

public boolean hasVariable()

Indicator whether the time period has a variable in any of the child expressions.

Specified by:

hasVariable in interface ExprTimePeriod

Returns:

true for variable present, false for not present

validate

public ExprNode validate(ExprValidationContext validationContext)
                  throws ExprValidationException

Specified by:

validate in interface ExprValidator

Throws:

ExprValidationException

evaluateAsSeconds

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

Specified by:

evaluateAsSeconds in interface ExprTimePeriod

evaluateGetTimePeriod

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

Specified by:

evaluateGetTimePeriod in interface ExprTimePeriod

getType

public java.lang.Class getType()

Description copied from interface: ExprEvaluator

Returns the type that the node's evaluate method returns an instance of.

Specified by:

getType in interface ExprEvaluator

Returns:

type returned when evaluated

isConstantResult

public 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

Specified by:

isConstantResult in interface ExprTimePeriod

Returns:

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

toPrecedenceFreeEPL

public void toPrecedenceFreeEPL(java.io.StringWriter writer)

Specified by:

toPrecedenceFreeEPL in class ExprNodeBase

getPrecedence

public ExprPrecedenceEnum getPrecedence()

Description copied from interface: ExprNode

Returns precedence.

Specified by:

getPrecedence in interface ExprNode

Returns:

precedence

equalsNode

public boolean equalsNode(ExprNode node)

Description copied from interface: ExprNode

Return true if a expression node semantically equals the current node, or false if not.

Concrete implementations should compare the type and any additional information that impact the evaluation of a node.

Specified by:

equalsNode in interface ExprNode

Parameters:

node - to compare to

Returns:

true if semantically equal, or false if not equals