Package org.apache.iotdb.db.mpp.aggregation.timerangeiterator

Class PreAggrWindowIterator

java.lang.Object

org.apache.iotdb.db.mpp.aggregation.timerangeiterator.PreAggrWindowIterator

All Implemented Interfaces:

ITimeRangeIterator

public class PreAggrWindowIterator
extends java.lang.Object
implements ITimeRangeIterator

This class iteratively generates pre-aggregated time windows.

For example, startTime = 0, endTime = 11, interval = 5, slidingStep = 3, return [0,2),[2,3),[3,5),[5,6),[6,8),[8,9),[9,10)

Constructor Summary

Constructors

Constructor	Description
PreAggrWindowIterator(long startTime, long endTime, long interval, long slidingStep, boolean isAscending, boolean leftCRightO)

Method Summary

Modifier and Type	Method	Description
long	currentOutputTime()	As there is only one timestamp can be output for a time range, this method will return the output time based on leftCloseRightOpen or not.
org.apache.iotdb.tsfile.read.common.TimeRange	getFirstTimeRange()	return the first time range by sorting order
long	getTotalIntervalNum()
boolean	hasNextTimeRange()
boolean	isAscending()
org.apache.iotdb.tsfile.read.common.TimeRange	nextTimeRange()	return the next time range according to curStartTime (the start time of the last returned time range)

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.iotdb.db.mpp.aggregation.timerangeiterator.ITimeRangeIterator

getFinalTimeRange

Constructor Detail

PreAggrWindowIterator

public PreAggrWindowIterator(long startTime,
                             long endTime,
                             long interval,
                             long slidingStep,
                             boolean isAscending,
                             boolean leftCRightO)

Method Detail

getFirstTimeRange

public org.apache.iotdb.tsfile.read.common.TimeRange getFirstTimeRange()

Description copied from interface: ITimeRangeIterator

return the first time range by sorting order

Specified by:

getFirstTimeRange in interface ITimeRangeIterator

hasNextTimeRange

public boolean hasNextTimeRange()

Specified by:

hasNextTimeRange in interface ITimeRangeIterator

Returns:

whether current iterator has next time range

nextTimeRange

public org.apache.iotdb.tsfile.read.common.TimeRange nextTimeRange()

Description copied from interface: ITimeRangeIterator

return the next time range according to curStartTime (the start time of the last returned time range)

Specified by:

nextTimeRange in interface ITimeRangeIterator

isAscending

public boolean isAscending()

Specified by:

isAscending in interface ITimeRangeIterator

currentOutputTime

public long currentOutputTime()

Description copied from interface: ITimeRangeIterator

As there is only one timestamp can be output for a time range, this method will return the output time based on leftCloseRightOpen or not.

Specified by:

currentOutputTime in interface ITimeRangeIterator

Returns:

minTime if leftCloseRightOpen, else maxTime.

getTotalIntervalNum

public long getTotalIntervalNum()

Specified by:

getTotalIntervalNum in interface ITimeRangeIterator