org.apache.druid.frame.field

Interface FieldWriter

All Superinterfaces:

AutoCloseable, Closeable

All Known Implementing Classes:

ComplexFieldWriter, DoubleFieldWriter, FloatFieldWriter, LongFieldWriter, StringArrayFieldWriter, StringFieldWriter

public interface FieldWriter
extends Closeable

Helper used to write field values to row-based frames or RowKey. Most callers should use FrameWriters to build frames from ColumnSelectorFactory, rather than using this interface directly. Not thread-safe.

Method Summary

Modifier and Type	Method and Description
void	close() Releases resources held by this writer.
long	writeTo(org.apache.datasketches.memory.WritableMemory memory, long position, long maxSize) Writes the current selection at the given memory position.

Method Detail

writeTo

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

Writes the current selection at the given memory position.

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

void close()

Releases resources held by this writer.

Specified by:

close in interface AutoCloseable

Specified by:

close in interface Closeable