Package io.delta.kernel.internal.util

Class FileNames

Object

io.delta.kernel.internal.util.FileNames

public final class FileNames
extends Object

Field Summary

Fields

Modifier and Type	Field	Description
static final String	SIDECAR_DIRECTORY

Method Summary

Modifier and Type	Method	Description
static Path	checkpointFileSingular(Path path, long version)	Returns the path for a singular checkpoint up to the given version.
static List<Path>	checkpointFileWithParts(Path path, long version, int numParts)	Returns the paths for all parts of the checkpoint up to the given version.
static long	checkpointVersion(Path path)	Returns the version for the given checkpoint path.
static long	checkpointVersion(String path)
static String	deltaFile(Path path, long version)	Returns the delta (json format) path for a given delta file.
static long	deltaVersion(Path path)	Returns the version for the given delta path.
static long	deltaVersion(String path)
static long	getFileVersion(Path path)	Get the version of the checkpoint, checksum or delta file.
static boolean	isCheckpointFile(String fileName)
static boolean	isClassicCheckpointFile(String fileName)
static boolean	isCommitFile(String fileName)
static boolean	isMulitPartCheckpointFile(String fileName)
static boolean	isV2CheckpointFile(String fileName)
static String	listingPrefix(Path path, long version)	Returns the prefix of all delta log files for the given version.
static String	sidecarFile(Path path, String sidecar)
static Path	topLevelV2CheckpointFile(Path path, long version, String uuid, String fileType)	Returns the path for a top-level V2 checkpoint file up to the given version with a given UUID and filetype (JSON or Parquet).
static Path	v2CheckpointSidecarFile(Path path, String uuid)	Returns the path for a V2 sidecar file with a given UUID.

Methods inherited from class java.lang.Object

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

Field Details

SIDECAR_DIRECTORY

public static final String SIDECAR_DIRECTORY

See Also:

• Constant Field Values

Method Details

deltaFile

public static String deltaFile(Path path,
 long version)

Returns the delta (json format) path for a given delta file.

deltaVersion

public static long deltaVersion(Path path)

Returns the version for the given delta path.

deltaVersion

public static long deltaVersion(String path)

checkpointVersion

public static long checkpointVersion(Path path)

Returns the version for the given checkpoint path.

checkpointVersion

public static long checkpointVersion(String path)

sidecarFile

public static String sidecarFile(Path path,
 String sidecar)

listingPrefix

public static String listingPrefix(Path path,
 long version)

Returns the prefix of all delta log files for the given version.

Intended for use with listFrom to get all files from this version onwards. The returned Path will not exist as a file.

checkpointFileSingular

public static Path checkpointFileSingular(Path path,
 long version)

Returns the path for a singular checkpoint up to the given version.

In a future protocol version this path will stop being written.

topLevelV2CheckpointFile

public static Path topLevelV2CheckpointFile(Path path,
 long version,
 String uuid,
 String fileType)

Returns the path for a top-level V2 checkpoint file up to the given version with a given UUID and filetype (JSON or Parquet).

v2CheckpointSidecarFile

public static Path v2CheckpointSidecarFile(Path path,
 String uuid)

Returns the path for a V2 sidecar file with a given UUID.

checkpointFileWithParts

public static List<Path> checkpointFileWithParts(Path path,
 long version,
 int numParts)

Returns the paths for all parts of the checkpoint up to the given version.

In a future protocol version we will write this path instead of checkpointFileSingular.

Example of the format: 00000000000000004915.checkpoint.0000000020.0000000060.parquet is checkpoint part 20 out of 60 for the snapshot at version 4915. Zero padding is for lexicographic sorting.

isCheckpointFile

public static boolean isCheckpointFile(String fileName)

isClassicCheckpointFile

public static boolean isClassicCheckpointFile(String fileName)

isMulitPartCheckpointFile

public static boolean isMulitPartCheckpointFile(String fileName)

isV2CheckpointFile

public static boolean isV2CheckpointFile(String fileName)

isCommitFile

public static boolean isCommitFile(String fileName)

getFileVersion

public static long getFileVersion(Path path)

Get the version of the checkpoint, checksum or delta file. Throws an error if an unexpected file type is seen. These unexpected files should be filtered out to ensure forward compatibility in cases where new file types are added, but without an explicit protocol upgrade.