org.apache.iotdb.tsfile.read.common

Class DescReadWriteBatchData

java.lang.Object

org.apache.iotdb.tsfile.read.common.BatchData

org.apache.iotdb.tsfile.read.common.DescReadBatchData

org.apache.iotdb.tsfile.read.common.DescReadWriteBatchData

public class DescReadWriteBatchData
extends DescReadBatchData

This class is for reading and writing batch data in reverse. The data source is from mergeReader. For example, the time sequence from mergeReader is 1000 -> 1, to keep the consistency that the timestamp should be ascending. It will be written in reverse, i.e. the timeRet will be [1, 1000]. Then it can be handled the same as DescReadBatchData.

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.iotdb.tsfile.read.common.BatchData

BatchData.BatchDataType

Field Summary

Fields inherited from class org.apache.iotdb.tsfile.read.common.BatchData

batchDataType, binaryRet, booleanRet, capacity, CAPACITY_THRESHOLD, count, dataType, doubleRet, floatRet, intRet, longRet, readCurArrayIndex, readCurListIndex, timeRet, vectorRet, writeCurArrayIndex, writeCurListIndex

Constructor Summary

Constructors

Constructor and Description
DescReadWriteBatchData(TSDataType dataType)

Method Summary

Modifier and Type	Method and Description
BatchData	flip() Read: When put data, the writeIndex increases while the readIndex remains 0.
Binary	getBinaryByIndex(int idx) Get the idx th binary value by the time ascending order
boolean	getBooleanByIndex(int idx) Get the idx th boolean value by the time ascending order
double	getDoubleByIndex(int idx) Get the idx th double value by the time ascending order
float	getFloatByIndex(int idx) Get the idx th float value by the time ascending order
int	getIntByIndex(int idx) Get the idx th int value by the time ascending order
long	getLongByIndex(int idx) Get the idx th long value by the time ascending order
long	getTimeByIndex(int idx) Get the idx th timestamp by the time ascending order
TsPrimitiveType[]	getVectorByIndex(int idx) Get the idx th vector value by the time ascending order
boolean	hasCurrent()
void	next()
void	putBinary(long t, Binary v) put binary data reversely.
void	putBoolean(long t, boolean v) put boolean data reversely.
void	putDouble(long t, double v) put double data reversely.
void	putFloat(long t, float v) put float data reversely.
void	putInt(long t, int v) put int data reversely.
void	putLong(long t, long v) put long data reversely.
void	putVector(long t, TsPrimitiveType[] v) put vector data.
void	resetBatchData() This method is used to reset batch data when more than one group by aggregation functions visit the same batch data
void	serializeData(DataOutputStream outputStream) For any implementation of BatchData, the data serializing sequence must equal the one of writing, otherwise after deserializing the sequence will be reversed

Methods inherited from class org.apache.iotdb.tsfile.read.common.DescReadBatchData

getValueInTimestamp

Methods inherited from class org.apache.iotdb.tsfile.read.common.BatchData

currentTime, currentTsPrimitiveType, currentValue, getBatchDataIterator, getBatchDataIterator, getBatchDataType, getBinary, getBoolean, getDataType, getDouble, getFloat, getInt, getLastPairBeforeOrEqualTimestamp, getLong, getMaxTimestamp, getMinTimestamp, getReadCurArrayIndex, getReadCurListIndex, getVector, init, isEmpty, length, putAnObject, resetBatchData, setBinary, setBoolean, setDataType, setDouble, setFloat, setInt, setLong, setTime, setVector

Methods inherited from class java.lang.Object

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

Constructor Detail

DescReadWriteBatchData

public DescReadWriteBatchData(TSDataType dataType)

Method Detail

putBoolean

public void putBoolean(long t,
                       boolean v)

put boolean data reversely.

Overrides:

putBoolean in class BatchData

Parameters:

t - timestamp

v - boolean data

putInt

public void putInt(long t,
                   int v)

put int data reversely.

Overrides:

putInt in class BatchData

Parameters:

t - timestamp

v - int data

putLong

public void putLong(long t,
                    long v)

put long data reversely.

Overrides:

putLong in class BatchData

Parameters:

t - timestamp

v - long data

putFloat

public void putFloat(long t,
                     float v)

put float data reversely.

Overrides:

putFloat in class BatchData

Parameters:

t - timestamp

v - float data

putDouble

public void putDouble(long t,
                      double v)

put double data reversely.

Overrides:

putDouble in class BatchData

Parameters:

t - timestamp

v - double data

putBinary

public void putBinary(long t,
                      Binary v)

put binary data reversely.

Overrides:

putBinary in class BatchData

Parameters:

t - timestamp

v - binary data.

putVector

public void putVector(long t,
                      TsPrimitiveType[] v)

put vector data.

Overrides:

putVector in class BatchData

Parameters:

t - timestamp

v - vector data.

hasCurrent

public boolean hasCurrent()

Overrides:

hasCurrent in class DescReadBatchData

next

public void next()

Overrides:

next in class DescReadBatchData

resetBatchData

public void resetBatchData()

Description copied from class: BatchData

This method is used to reset batch data when more than one group by aggregation functions visit the same batch data

Overrides:

resetBatchData in class DescReadBatchData

getTimeByIndex

public long getTimeByIndex(int idx)

Description copied from class: BatchData

Get the idx th timestamp by the time ascending order

Overrides:

getTimeByIndex in class BatchData

getLongByIndex

public long getLongByIndex(int idx)

Description copied from class: BatchData

Get the idx th long value by the time ascending order

Overrides:

getLongByIndex in class BatchData

getDoubleByIndex

public double getDoubleByIndex(int idx)

Description copied from class: BatchData

Get the idx th double value by the time ascending order

Overrides:

getDoubleByIndex in class BatchData

getIntByIndex

public int getIntByIndex(int idx)

Description copied from class: BatchData

Get the idx th int value by the time ascending order

Overrides:

getIntByIndex in class BatchData

getFloatByIndex

public float getFloatByIndex(int idx)

Description copied from class: BatchData

Get the idx th float value by the time ascending order

Overrides:

getFloatByIndex in class BatchData

getBinaryByIndex

public Binary getBinaryByIndex(int idx)

Description copied from class: BatchData

Get the idx th binary value by the time ascending order

Overrides:

getBinaryByIndex in class BatchData

getBooleanByIndex

public boolean getBooleanByIndex(int idx)

Description copied from class: BatchData

Get the idx th boolean value by the time ascending order

Overrides:

getBooleanByIndex in class BatchData

getVectorByIndex

public TsPrimitiveType[] getVectorByIndex(int idx)

Description copied from class: BatchData

Get the idx th vector value by the time ascending order

Overrides:

getVectorByIndex in class BatchData

serializeData

public void serializeData(DataOutputStream outputStream)
                   throws IOException

Description copied from class: BatchData

For any implementation of BatchData, the data serializing sequence must equal the one of writing, otherwise after deserializing the sequence will be reversed

Overrides:

serializeData in class BatchData

Throws:

IOException

flip

public BatchData flip()

Read: When put data, the writeIndex increases while the readIndex remains 0. For descending read, we need to read from writeIndex to writeCurArrayIndex

Overrides:

flip in class DescReadBatchData