uk.ac.starlink.feather

Class NumberStarColumnWriter

java.lang.Object

uk.ac.starlink.feather.StarColumnWriter

uk.ac.starlink.feather.NumberStarColumnWriter

All Implemented Interfaces:

uk.ac.bristol.star.feather.FeatherColumnWriter

public abstract class NumberStarColumnWriter
extends StarColumnWriter

StarColumnWriter implementation for numeric values.

Since:

27 Feb 2020

Author:

Mark Taylor

Nested Class Summary

Nested classes/interfaces inherited from class uk.ac.starlink.feather.StarColumnWriter

StarColumnWriter.DataStat

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	NumberStarColumnWriter(StarTable table, int icol, uk.ac.bristol.star.feather.FeatherType featherType, boolean isNullable, byte[] blank) Constructor.

Method Summary

Modifier and Type	Method and Description
ItemAccumulator	createItemAccumulator(StoragePolicy storage)
StarColumnWriter.DataStat	writeDataBytes(OutputStream out) Writes the bytes consituting the data stream for this column, excluding any optional validity mask.
protected abstract void	writeNumber(OutputStream out, Number value) Writes the bytes for a given typed value.

Methods inherited from class uk.ac.starlink.feather.StarColumnWriter

getColumnIndex, getFeatherType, getName, getTable, getUserMetadata, isNullable, writeColumnBytes

Methods inherited from class java.lang.Object

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

Constructor Detail

NumberStarColumnWriter

protected NumberStarColumnWriter(StarTable table,
                                 int icol,
                                 uk.ac.bristol.star.feather.FeatherType featherType,
                                 boolean isNullable,
                                 byte[] blank)

Constructor.

Parameters:

table - input table

icol - column index

featherType - output data type

isNullable - true iff no in-band blank representation exists

blank - byte pattern of blank value; the length of this array also defines the output item size in bytes

Method Detail

writeNumber

protected abstract void writeNumber(OutputStream out,
                                    Number value)
                             throws IOException

Writes the bytes for a given typed value.

Parameters:

out - destination stream

value - non-null typed value to write

Throws:

IOException

writeDataBytes

public StarColumnWriter.DataStat writeDataBytes(OutputStream out)
                                         throws IOException

Description copied from class: StarColumnWriter

Writes the bytes consituting the data stream for this column, excluding any optional validity mask. Note the output does not need to be aligned on an 8-byte boundary.

Specified by:

writeDataBytes in class StarColumnWriter

Parameters:

out - destination stream

Returns:

information about what was actually written

Throws:

IOException

createItemAccumulator

public ItemAccumulator createItemAccumulator(StoragePolicy storage)

Specified by:

createItemAccumulator in class StarColumnWriter