Package org.apache.iotdb.db.mpp.transformation.dag.transformer

Class Transformer

java.lang.Object

org.apache.iotdb.db.mpp.transformation.dag.transformer.Transformer

All Implemented Interfaces:

LayerPointReader, YieldableReader

Direct Known Subclasses:

BinaryTransformer, TernaryTransformer, UDFQueryTransformer, UnaryTransformer

public abstract class Transformer
extends java.lang.Object
implements LayerPointReader

Field Summary

Fields

Modifier and Type	Field	Description
protected org.apache.iotdb.tsfile.utils.Binary	cachedBinary
protected boolean	cachedBoolean
protected double	cachedDouble
protected float	cachedFloat
protected int	cachedInt
protected long	cachedLong
protected long	cachedTime
protected boolean	currentNull
protected boolean	hasCachedValue

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	Transformer()

Method Summary

Modifier and Type	Method	Description
protected abstract boolean	cacheValue()	if this method returns true, at least one of the cached field should be set
org.apache.iotdb.tsfile.utils.Binary	currentBinary()
boolean	currentBoolean()
double	currentDouble()
float	currentFloat()
int	currentInt()
long	currentLong()
long	currentTime()
boolean	isCurrentNull()
boolean	next()
void	readyForNext()
YieldableState	yield()
protected abstract YieldableState	yieldValue()	if this method returns YieldableState.YIELDABLE, at least one of the cached field should be set

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.transformation.api.LayerPointReader

getDataType, isConstantPointReader

Field Detail

hasCachedValue

protected boolean hasCachedValue

cachedTime

protected long cachedTime

cachedInt

protected int cachedInt

cachedLong

protected long cachedLong

cachedFloat

protected float cachedFloat

cachedDouble

protected double cachedDouble

cachedBoolean

protected boolean cachedBoolean

cachedBinary

protected org.apache.iotdb.tsfile.utils.Binary cachedBinary

currentNull

protected boolean currentNull

Constructor Detail

Transformer

protected Transformer()

Method Detail

next

public final boolean next()
                   throws QueryProcessException,
                          java.io.IOException

Specified by:

next in interface LayerPointReader

Throws:

QueryProcessException

java.io.IOException

cacheValue

protected abstract boolean cacheValue()
                               throws QueryProcessException,
                                      java.io.IOException

if this method returns true, at least one of the cached field should be set

Throws:

QueryProcessException

java.io.IOException

yield

public final YieldableState yield()
                           throws java.io.IOException,
                                  QueryProcessException

Specified by:

yield in interface YieldableReader

Throws:

java.io.IOException

QueryProcessException

yieldValue

protected abstract YieldableState yieldValue()
                                      throws QueryProcessException,
                                             java.io.IOException

if this method returns YieldableState.YIELDABLE, at least one of the cached field should be set

Throws:

QueryProcessException

java.io.IOException

readyForNext

public final void readyForNext()

Specified by:

readyForNext in interface LayerPointReader

currentTime

public final long currentTime()

Specified by:

currentTime in interface LayerPointReader

currentInt

public final int currentInt()

Specified by:

currentInt in interface LayerPointReader

currentLong

public final long currentLong()

Specified by:

currentLong in interface LayerPointReader

currentFloat

public final float currentFloat()

Specified by:

currentFloat in interface LayerPointReader

currentDouble

public final double currentDouble()

Specified by:

currentDouble in interface LayerPointReader

currentBoolean

public final boolean currentBoolean()

Specified by:

currentBoolean in interface LayerPointReader

currentBinary

public final org.apache.iotdb.tsfile.utils.Binary currentBinary()

Specified by:

currentBinary in interface LayerPointReader

isCurrentNull

public final boolean isCurrentNull()

Specified by:

isCurrentNull in interface LayerPointReader