org.apache.iotdb.tsfile.file.metadata.statistics

Class Statistics<T extends Serializable>

java.lang.Object

org.apache.iotdb.tsfile.file.metadata.statistics.Statistics<T>

Direct Known Subclasses:

BinaryStatistics, BooleanStatistics, DoubleStatistics, FloatStatistics, IntegerStatistics, LongStatistics, TimeStatistics

public abstract class Statistics<T extends Serializable>
extends Object

This class is used for recording statistic information of each measurement in a delta file. While writing processing, the processor records the statistics information. Statistics includes maximum, minimum and null value count up to version 0.0.1.
Each data type extends this Statistic as super class.

For the statistics in the Unseq file TimeSeriesMetadata, only firstValue, lastValue, startTime and endTime can be used.

Field Summary

Fields

Modifier and Type	Field and Description
protected boolean	isEmpty isEmpty being false means this statistic has been initialized and the max and min is not null;

Constructor Summary

Constructors

Constructor and Description
Statistics()

Method Summary

Modifier and Type	Method and Description
abstract long	calculateRamSize()
abstract void	deserialize(ByteBuffer byteBuffer)
static Statistics<? extends Serializable>	deserialize(ByteBuffer buffer, TSDataType dataType)
abstract void	deserialize(InputStream inputStream) read data from the inputStream.
static Statistics<? extends Serializable>	deserialize(InputStream inputStream, TSDataType dataType)
boolean	equals(Object o)
long	getCount()
long	getEndTime()
abstract T	getFirstValue()
abstract T	getLastValue()
abstract T	getMaxValue()
abstract T	getMinValue()
int	getSerializedSize()
static int	getSizeByType(TSDataType type)
long	getStartTime()
static Statistics<? extends Serializable>	getStatsByType(TSDataType type) static method providing statistic instance for respective data type.
abstract int	getStatsSize()
abstract double	getSumDoubleValue()
abstract long	getSumLongValue()
abstract TSDataType	getType()
int	hashCode()
boolean	isEmpty()
void	mergeStatistics(Statistics<? extends Serializable> stats) merge parameter to this statistic
protected abstract void	mergeStatisticsValue(Statistics<T> stats)
int	serialize(OutputStream outputStream)
void	setCount(int count)
void	setEmpty(boolean empty)
void	setEndTime(long endTime)
void	setStartTime(long startTime)
String	toString()
void	update(long time)
void	update(long[] time, Binary[] values, int batchSize)
void	update(long[] time, boolean[] values, int batchSize)
void	update(long[] time, double[] values, int batchSize)
void	update(long[] time, float[] values, int batchSize)
void	update(long[] time, int batchSize)
void	update(long[] time, int[] values, int batchSize)
void	update(long[] time, long[] values, int batchSize)
void	update(long time, Binary value)
void	update(long time, boolean value)
void	update(long time, double value)
void	update(long time, float value)
void	update(long time, int value)
void	update(long time, long value)
void	updateStats(long min, long max) This method with two parameters is only used by unsequence which updates/inserts/deletes timestamp.

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Field Detail

isEmpty

protected boolean isEmpty

isEmpty being false means this statistic has been initialized and the max and min is not null;

Constructor Detail

Statistics

public Statistics()

Method Detail

getStatsByType

public static Statistics<? extends Serializable> getStatsByType(TSDataType type)

static method providing statistic instance for respective data type.

Parameters:

type - - data type

Returns:

Statistics

getSizeByType

public static int getSizeByType(TSDataType type)

getType

public abstract TSDataType getType()

getSerializedSize

public int getSerializedSize()

getStatsSize

public abstract int getStatsSize()

serialize

public int serialize(OutputStream outputStream)
              throws IOException

Throws:

IOException

deserialize

public abstract void deserialize(InputStream inputStream)
                          throws IOException

read data from the inputStream.

Throws:

IOException

deserialize

public abstract void deserialize(ByteBuffer byteBuffer)

getMinValue

public abstract T getMinValue()

getMaxValue

public abstract T getMaxValue()

getFirstValue

public abstract T getFirstValue()

getLastValue

public abstract T getLastValue()

getSumDoubleValue

public abstract double getSumDoubleValue()

getSumLongValue

public abstract long getSumLongValue()

mergeStatistics

public void mergeStatistics(Statistics<? extends Serializable> stats)

merge parameter to this statistic

Throws:

StatisticsClassException - cannot merge statistics

update

public void update(long time,
                   boolean value)

update

public void update(long time,
                   int value)

update

public void update(long time,
                   long value)

update

public void update(long time,
                   float value)

update

public void update(long time,
                   double value)

update

public void update(long time,
                   Binary value)

update

public void update(long time)

update

public void update(long[] time,
                   boolean[] values,
                   int batchSize)

update

public void update(long[] time,
                   int[] values,
                   int batchSize)

update

public void update(long[] time,
                   long[] values,
                   int batchSize)

update

public void update(long[] time,
                   float[] values,
                   int batchSize)

update

public void update(long[] time,
                   double[] values,
                   int batchSize)

update

public void update(long[] time,
                   Binary[] values,
                   int batchSize)

update

public void update(long[] time,
                   int batchSize)

mergeStatisticsValue

protected abstract void mergeStatisticsValue(Statistics<T> stats)

isEmpty

public boolean isEmpty()

setEmpty

public void setEmpty(boolean empty)

updateStats

public void updateStats(long min,
                        long max)

This method with two parameters is only used by unsequence which updates/inserts/deletes timestamp.

Parameters:

min - min timestamp

max - max timestamp

deserialize

public static Statistics<? extends Serializable> deserialize(InputStream inputStream,
                                                             TSDataType dataType)
                                                      throws IOException

Throws:

IOException

deserialize

public static Statistics<? extends Serializable> deserialize(ByteBuffer buffer,
                                                             TSDataType dataType)

getStartTime

public long getStartTime()

getEndTime

public long getEndTime()

getCount

public long getCount()

setStartTime

public void setStartTime(long startTime)

setEndTime

public void setEndTime(long endTime)

setCount

public void setCount(int count)

calculateRamSize

public abstract long calculateRamSize()

toString

public String toString()

Overrides:

toString in class Object

equals

public boolean equals(Object o)

Overrides:

equals in class Object

hashCode

public int hashCode()

Overrides:

hashCode in class Object