FileWriter

Type Parameters:

T - the row type

R - the result type

All Superinterfaces:

java.lang.AutoCloseable, java.io.Closeable

All Known Implementing Classes:

DataWriter, EqualityDeleteWriter, PositionDeleteWriter, RollingDataWriter, RollingEqualityDeleteWriter, RollingPositionDeleteWriter
```
public interface FileWriter<T,R>
extends java.io.Closeable
```
A writer capable of writing files of a single type (i.e. data/delete) to one spec/partition.
As opposed to FileAppender, this interface should be implemented by classes that not only append records to files but actually produce DataFiles or DeleteFiles objects with Iceberg metadata. Implementations may wrap FileAppenders with extra information such as spec, partition, sort order ID needed to construct DataFiles or DeleteFiles.

Method Summary

All Methods Instance Methods Abstract Methods Default Methods
Modifier and Type	Method	Description
`long`	`length()`	Returns the number of bytes that were currently written by this writer.
`R`	`result()`	Returns a result that contains information about written `DataFile`s or `DeleteFile`s.
`default void`	`write(java.lang.Iterable<T> rows)`	Writes rows to a predefined spec/partition.
`void`	`write(T row)`	Writes a row to a predefined spec/partition.

Methods inherited from interface java.io.Closeable
close

- Method Detail
  - write
```
default void write(java.lang.Iterable<T> rows)
```
    Writes rows to a predefined spec/partition.
    
    Parameters:
    
    rows - data or delete records
  - write
```
void write(T row)
```
    Writes a row to a predefined spec/partition.
    
    Parameters:
    
    row - a data or delete record
  - length
```
long length()
```
    Returns the number of bytes that were currently written by this writer.
    
    Returns:
    
    the number of written bytes
  - result
```
R result()
```
    Returns a result that contains information about written DataFiles or DeleteFiles. The result is valid only after the writer is closed.
    
    Returns:
    
    the file writer result