FrameColumnWriter (druid-processing 30.0.1 API)

All Superinterfaces:

AutoCloseable, Closeable

All Known Implementing Classes:

ComplexFrameColumnWriter, DoubleArrayFrameColumnWriter, DoubleFrameColumnWriter, FloatArrayFrameColumnWriter, FloatFrameColumnWriter, LongArrayFrameColumnWriter, LongFrameColumnWriter, NumericArrayFrameColumnWriter, StringFrameColumnWriter
```
public interface FrameColumnWriter
extends Closeable
```
Represent writers for the columnar frames. The class objects must be provided with information on what values to write, usually provided as a ColumnValueSelector and where to write to, usually temporary growable memory addSelection() will be called repeatedly, as the current value to write gets updated. For the final write, call writeTo(org.apache.datasketches.memory.WritableMemory, long), which will copy the values we have added so far to the destination memory.

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`boolean`	`addSelection()`	Adds the current value to the writer
`void`	`close()`
`long`	`size()`	Size (in bytes) of the column data that will get written when `writeTo(org.apache.datasketches.memory.WritableMemory, long)` will be called
`void`	`undo()`	Reverts the last added value.
`long`	`writeTo(org.apache.datasketches.memory.WritableMemory memory, long position)`	Writes the value of the column to the provided memory at the given position

- Method Detail
  - addSelection
```
boolean addSelection()
```
    Adds the current value to the writer
  - undo
```
void undo()
```
    Reverts the last added value. Undo calls cannot be called in successsion
  - size
```
long size()
```
    Size (in bytes) of the column data that will get written when writeTo(org.apache.datasketches.memory.WritableMemory, long) will be called
  - writeTo
```
long writeTo(org.apache.datasketches.memory.WritableMemory memory,
             long position)
```
    Writes the value of the column to the provided memory at the given position
  - close
```
void close()
```
    Specified by:
    
    close in interface AutoCloseable
    
    Specified by:
    
    close in interface Closeable