Package org.apache.iotdb.tsfile.read.query.timegenerator

Class TimeGenerator

java.lang.Object

org.apache.iotdb.tsfile.read.query.timegenerator.TimeGenerator

Direct Known Subclasses:

TsFileTimeGenerator

public abstract class TimeGenerator
extends Object

All SingleSeriesExpression involved in a IExpression will be transferred to a TimeGenerator tree whose leaf nodes are all SeriesReaders, The TimeGenerator tree can generate the next timestamp that satisfies the filter condition. Then we use this timestamp to get values in other series that are not included in IExpression

Field Summary

Fields

Modifier and Type	Field	Description
protected Node	operatorNode

Constructor Summary

Constructors

Constructor	Description
TimeGenerator()

Method Summary

Modifier and Type	Method	Description
protected Node	construct(IExpression expression)	construct the tree that generate timestamp.
void	constructNode(IExpression expression)
protected abstract IBatchReader	generateNewBatchReader(SingleSeriesExpression expression)
abstract Filter	getTimeFilter()
Object	getValue(Path path)	ATTENTION: this method should only be used when there is no `OR` node
Object[]	getValues(Path path)	ATTENTION: this method should only be used when there is no `OR` node
boolean	hasNext()
boolean	hasOrNode()
protected abstract boolean	isAscending()
long	next()

Methods inherited from class java.lang.Object

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

Field Detail

operatorNode

protected Node operatorNode

Constructor Detail

TimeGenerator

public TimeGenerator()

Method Detail

hasNext

public boolean hasNext()
                throws IOException

Throws:

IOException

next

public long next()
          throws IOException

Throws:

IOException

getValues

public Object[] getValues(Path path)
                   throws IOException

ATTENTION: this method should only be used when there is no `OR` node

Throws:

IOException

getValue

public Object getValue(Path path)
                throws IOException

ATTENTION: this method should only be used when there is no `OR` node

Throws:

IOException

constructNode

public void constructNode(IExpression expression)
                   throws IOException

Throws:

IOException

construct

protected Node construct(IExpression expression)
                  throws IOException

construct the tree that generate timestamp.

Throws:

IOException

generateNewBatchReader

protected abstract IBatchReader generateNewBatchReader(SingleSeriesExpression expression)
                                                throws IOException

Throws:

IOException

hasOrNode

public boolean hasOrNode()

isAscending

protected abstract boolean isAscending()

getTimeFilter

public abstract Filter getTimeFilter()