Class ZeroFsFileStore

java.lang.Object

java.nio.file.FileStore

io.roastedroot.zerofs.ZeroFsFileStore

final class ZeroFsFileStore
extends FileStore

FileStore implementation which provides methods for file creation, lookup and attribute handling.

Most of these methods are actually implemented in another class: FileTree for lookup, FileFactory for creating and copying files and AttributeService for attribute handling. This class merely provides a single API through which to access the functionality of those classes.

Field Summary

Fields

Modifier and Type	Field	Description
private final AttributeService	attributes
private final HeapDisk	disk
private final FileFactory	factory
private final Lock	readLock
private final FileSystemState	state
private final Set<Feature>	supportedFeatures
private final FileTree	tree
private final Lock	writeLock

Constructor Summary

Constructors

Constructor	Description
ZeroFsFileStore(FileTree tree, FileFactory factory, HeapDisk disk, AttributeService attributes, Set<Feature> supportedFeatures, FileSystemState state)

Method Summary

Modifier and Type	Method	Description
(package private) File	copyWithoutContent(File file, AttributeCopyOption attributeCopyOption)	Creates a copy of the given file, copying its attributes as well according to the given attributeCopyOption.
(package private) Supplier<Directory>	directoryCreator()	Returns a supplier that creates a new directory.
Object	getAttribute(String attribute)
(package private) <V extends FileAttributeView> V	getFileAttributeView(FileLookup lookup, Class<V> type)	Returns an attribute view of the given type for the given file lookup callback, or null if the view type is not supported.
<V extends FileStoreAttributeView> V	getFileStoreAttributeView(Class<V> type)
(package private) Directory	getRoot(Name name)	Returns the root directory with the given name or null if no such directory exists.
(package private) SortedSet<Name>	getRootDirectoryNames()	Returns the names of the root directories in this store.
long	getTotalSpace()
long	getUnallocatedSpace()
long	getUsableSpace()
boolean	isReadOnly()
(package private) DirectoryEntry	lookUp(File workingDirectory, ZeroFsPath path, Set<? super LinkOption> options)	Looks up the file at the given path using the given link options.
String	name()
(package private) <A extends BasicFileAttributes> A	readAttributes(File file, Class<A> type)	Returns attributes of the given file as an object of the given type.
(package private) Map<String,Object>	readAttributes(File file, String attributes)	Returns a map containing the attributes described by the given string mapped to their values.
(package private) Lock	readLock()	Returns the read lock for this store.
(package private) Supplier<RegularFile>	regularFileCreator()	Returns a supplier that creates a new regular file.
(package private) void	setAttribute(File file, String attribute, Object value)	Sets the given attribute to the given value for the given file.
(package private) void	setInitialAttributes(File file, FileAttribute<?>... attrs)	Sets initial attributes on the given file.
(package private) FileSystemState	state()	Returns the file system state object.
(package private) Set<String>	supportedFileAttributeViews()	Returns the file attribute views supported by this store.
(package private) boolean	supportsFeature(Feature feature)	Returns whether or not the given feature is supported by this file store.
boolean	supportsFileAttributeView(Class<? extends FileAttributeView> type)
boolean	supportsFileAttributeView(String name)
(package private) Supplier<SymbolicLink>	symbolicLinkCreator(ZeroFsPath target)	Returns a supplier that creates a new symbolic link with the given target.
String	type()
(package private) Lock	writeLock()	Returns the write lock for this store.

Methods inherited from class FileStore

getBlockSize

Methods inherited from class Object

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

Field Details

tree

private final FileTree tree

disk

private final HeapDisk disk

attributes

private final AttributeService attributes

factory

private final FileFactory factory

supportedFeatures

private final Set<Feature> supportedFeatures

state

private final FileSystemState state

readLock

private final Lock readLock

writeLock

private final Lock writeLock

Constructor Details

ZeroFsFileStore

public ZeroFsFileStore(FileTree tree,
 FileFactory factory,
 HeapDisk disk,
 AttributeService attributes,
 Set<Feature> supportedFeatures,
 FileSystemState state)

Method Details

state

FileSystemState state()

Returns the file system state object.

readLock

Lock readLock()

Returns the read lock for this store.

writeLock

Lock writeLock()

Returns the write lock for this store.

getRootDirectoryNames

SortedSet<Name> getRootDirectoryNames()

Returns the names of the root directories in this store.

getRoot

Directory getRoot(Name name)

Returns the root directory with the given name or null if no such directory exists.

supportsFeature

boolean supportsFeature(Feature feature)

Returns whether or not the given feature is supported by this file store.

lookUp

DirectoryEntry lookUp(File workingDirectory,
 ZeroFsPath path,
 Set<? super LinkOption> options)
               throws IOException

Looks up the file at the given path using the given link options. If the path is relative, the lookup is relative to the given working directory.

Throws:

NoSuchFileException - if an element of the path other than the final element does not resolve to a directory or symbolic link (e.g. it doesn't exist or is a regular file)

IOException - if a symbolic link cycle is detected or the depth of symbolic link recursion otherwise exceeds a threshold

regularFileCreator

Supplier<RegularFile> regularFileCreator()

Returns a supplier that creates a new regular file.

directoryCreator

Supplier<Directory> directoryCreator()

Returns a supplier that creates a new directory.

symbolicLinkCreator

Supplier<SymbolicLink> symbolicLinkCreator(ZeroFsPath target)

Returns a supplier that creates a new symbolic link with the given target.

copyWithoutContent

File copyWithoutContent(File file,
 AttributeCopyOption attributeCopyOption)
                 throws IOException

Creates a copy of the given file, copying its attributes as well according to the given attributeCopyOption.

Throws:

IOException

setInitialAttributes

void setInitialAttributes(File file,
 FileAttribute<?>... attrs)

Sets initial attributes on the given file. Sets default attributes first, then attempts to set the given user-provided attributes.

getFileAttributeView

<V extends FileAttributeView> V getFileAttributeView(FileLookup lookup,
 Class<V> type)

Returns an attribute view of the given type for the given file lookup callback, or null if the view type is not supported.

readAttributes

Map<String,Object> readAttributes(File file,
 String attributes)

Returns a map containing the attributes described by the given string mapped to their values.

readAttributes

<A extends BasicFileAttributes> A readAttributes(File file,
 Class<A> type)

Returns attributes of the given file as an object of the given type.

Throws:

UnsupportedOperationException - if the given attributes type is not supported

setAttribute

void setAttribute(File file,
 String attribute,
 Object value)

Sets the given attribute to the given value for the given file.

supportedFileAttributeViews

Set<String> supportedFileAttributeViews()

Returns the file attribute views supported by this store.

name

public String name()

Specified by:

name in class FileStore

type

public String type()

Specified by:

type in class FileStore

isReadOnly

public boolean isReadOnly()

Specified by:

isReadOnly in class FileStore

getTotalSpace

public long getTotalSpace()
                   throws IOException

Specified by:

getTotalSpace in class FileStore

Throws:

IOException

getUsableSpace

public long getUsableSpace()
                    throws IOException

Specified by:

getUsableSpace in class FileStore

Throws:

IOException

getUnallocatedSpace

public long getUnallocatedSpace()
                         throws IOException

Specified by:

getUnallocatedSpace in class FileStore

Throws:

IOException

supportsFileAttributeView

public boolean supportsFileAttributeView(Class<? extends FileAttributeView> type)

Specified by:

supportsFileAttributeView in class FileStore

supportsFileAttributeView

public boolean supportsFileAttributeView(String name)

Specified by:

supportsFileAttributeView in class FileStore

getFileStoreAttributeView

public <V extends FileStoreAttributeView> V getFileStoreAttributeView(Class<V> type)

Specified by:

getFileStoreAttributeView in class FileStore

getAttribute

public Object getAttribute(String attribute)
                    throws IOException

Specified by:

getAttribute in class FileStore

Throws:

IOException