org.apache.druid.frame.field

Class DoubleFieldWriter

java.lang.Object

org.apache.druid.frame.field.DoubleFieldWriter

All Implemented Interfaces:

Closeable, AutoCloseable, FieldWriter

public class DoubleFieldWriter
extends Object
implements FieldWriter

Wraps a BaseDoubleColumnValueSelector and writes field values. See DoubleFieldReader for format details.

Field Summary

Fields

Modifier and Type	Field and Description
static byte	NOT_NULL_BYTE
static byte	NULL_BYTE
static int	SIZE

Constructor Summary

Constructors

Constructor and Description
DoubleFieldWriter(BaseDoubleColumnValueSelector selector)

Method Summary

Modifier and Type	Method and Description
void	close() Releases resources held by this writer.
static double	detransform(long bits) Inverse of transform(double).
static long	transform(double n) Transforms a double into a form where it can be compared as unsigned bytes without decoding.
long	writeTo(org.apache.datasketches.memory.WritableMemory memory, long position, long maxSize) Writes the current selection at the given memory position.

Methods inherited from class java.lang.Object

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

Field Detail

SIZE

public static final int SIZE

See Also:

Constant Field Values

NULL_BYTE

public static final byte NULL_BYTE

See Also:

Constant Field Values

NOT_NULL_BYTE

public static final byte NOT_NULL_BYTE

See Also:

Constant Field Values

Constructor Detail

DoubleFieldWriter

public DoubleFieldWriter(BaseDoubleColumnValueSelector selector)

Method Detail

writeTo

public long writeTo(org.apache.datasketches.memory.WritableMemory memory,
                    long position,
                    long maxSize)

Description copied from interface: FieldWriter

Writes the current selection at the given memory position.

Specified by:

writeTo in interface FieldWriter

Parameters:

memory - memory region in little-endian order

position - position to write

maxSize - maximum number of bytes to write

Returns:

number of bytes written, or -1 if "maxSize" was not enough memory

close

public void close()

Description copied from interface: FieldWriter

Releases resources held by this writer.

Specified by:

close in interface Closeable

Specified by:

close in interface AutoCloseable

Specified by:

close in interface FieldWriter

transform

public static long transform(double n)

Transforms a double into a form where it can be compared as unsigned bytes without decoding.

detransform

public static double detransform(long bits)

Inverse of transform(double).