Package org.trellisldp.file

Class FileUtils

java.lang.Object

org.trellisldp.file.FileUtils

public final class FileUtils
extends Object

File-based utilities.

Field Summary

Fields

Modifier and Type	Field	Description
static String	CONFIG_FILE_DIGEST_ALGORITHM	The configuration key controlling the digest algorithm in use.
static String	CONFIG_FILE_LDP_TYPE	The configuration key for controlling LDP type triples.
static int	LENGTH	The length of the CRC directory partition.
static int	MAX

Method Summary

Modifier and Type	Method	Description
static boolean	filterServerManagedQuads(Quad quad)	Filter any server-managed triples from the resource stream.
static InputStream	getBoundedStream(InputStream stream, int from, int to)	Get a bounded inputstream.
static File	getNquadsFile(File dir, Instant time)	Get the nquads file for a given moment in time.
static File	getResourceDirectory(File baseDirectory, IRI identifier)	Get a directory for a given resource identifier.
static Stream<Quad>	parseQuad(String line)	Parse a string into a stream of Quads.
static String	serializeQuad(Quad quad)	Serialize an RDF Quad.
static boolean	uncheckedDeleteIfExists(Path path)	Try to delete a file if it exists or throw an unchecked exception.
static Stream<Path>	uncheckedList(Path path)	Fetch a stream of files in the provided directory path.
static void	writeMemento(File resourceDir, Resource resource, Instant time)	Write a Memento to a particular resource directory.

Methods inherited from class java.lang.Object

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

Field Detail

CONFIG_FILE_LDP_TYPE

public static final String CONFIG_FILE_LDP_TYPE

The configuration key for controlling LDP type triples.

See Also:

Constant Field Values

CONFIG_FILE_DIGEST_ALGORITHM

public static final String CONFIG_FILE_DIGEST_ALGORITHM

The configuration key controlling the digest algorithm in use.

See Also:

Constant Field Values

LENGTH

public static final int LENGTH

The length of the CRC directory partition.

See Also:

Constant Field Values

MAX

public static final int MAX

See Also:

Constant Field Values

Method Detail

getResourceDirectory

public static File getResourceDirectory(File baseDirectory,
                                        IRI identifier)

Get a directory for a given resource identifier.

Parameters:

baseDirectory - the base directory

identifier - a resource identifier

Returns:

a directory

parseQuad

public static Stream<Quad> parseQuad(String line)

Parse a string into a stream of Quads.

Parameters:

line - the line of text

Returns:

the Quad

filterServerManagedQuads

public static boolean filterServerManagedQuads(Quad quad)

Filter any server-managed triples from the resource stream.

Parameters:

quad - the quad

Returns:

true if the quad should be kept, false otherwise

uncheckedDeleteIfExists

public static boolean uncheckedDeleteIfExists(Path path)

Try to delete a file if it exists or throw an unchecked exception.

Parameters:

path - the file path

Returns:

true if the file existed and was deleted; false otherwise

uncheckedList

public static Stream<Path> uncheckedList(Path path)

Fetch a stream of files in the provided directory path.

Parameters:

path - the directory path

Returns:

a stream of filenames

writeMemento

public static void writeMemento(File resourceDir,
                                Resource resource,
                                Instant time)

Write a Memento to a particular resource directory.

Parameters:

resourceDir - the resource directory

resource - the resource

time - the time for the memento

getBoundedStream

public static InputStream getBoundedStream(InputStream stream,
                                           int from,
                                           int to)
                                    throws IOException

Get a bounded inputstream.

Parameters:

stream - the input stream

from - the byte from which to start

to - the byte to which to read

Returns:

the bounded inputstream

Throws:

IOException - if an error occurs when skipping forward

serializeQuad

public static String serializeQuad(Quad quad)

Serialize an RDF Quad.

Parameters:

quad - the quad

Returns:

a serialization of the quad

getNquadsFile

public static File getNquadsFile(File dir,
                                 Instant time)

Get the nquads file for a given moment in time.

Parameters:

dir - the directory

time - the time

Returns:

the file