Package io.roastedroot.zerofs

Class FileTree

java.lang.Object

io.roastedroot.zerofs.FileTree

final class FileTree
extends Object

The tree of directories and files for the file system. Contains the file system root directories and provides the ability to look up files by path. One piece of the file store implementation.

Field Summary

Fields

Modifier and Type	Field	Description
private static final List<Name>	EMPTY_PATH_NAMES
private static final int	MAX_SYMBOLIC_LINK_DEPTH	Doesn't much matter, but this number comes from MIN_ELOOP_THRESHOLD here
private final SortedMap<Name,Directory>	roots	Map of root names to root directories.

Constructor Summary

Constructors

Constructor	Description
FileTree(Map<Name,Directory> roots)	Creates a new file tree with the given root directories.

Method Summary

Modifier and Type	Method	Description
private DirectoryEntry	followSymbolicLink(File dir, SymbolicLink link, int linkDepth)	Returns the directory entry located by the target path of the given symbolic link, resolved relative to the given directory.
private DirectoryEntry	getRealEntry(DirectoryEntry entry)	Returns the entry for the file in its parent directory.
DirectoryEntry	getRoot(Name name)	Gets the directory entry for the root with the given name or null if no such root exists.
SortedSet<Name>	getRootDirectoryNames()	Returns the names of the root directories in this tree.
private static boolean	isEmpty(List<Name> names)
DirectoryEntry	lookUp(File workingDirectory, ZeroFsPath path, Set<? super LinkOption> options)	Returns the result of the file lookup for the given path.
private DirectoryEntry	lookUp(File dir, ZeroFsPath path, Set<? super LinkOption> options, int linkDepth)
private DirectoryEntry	lookUp(File dir, Iterable<Name> names, Set<? super LinkOption> options, int linkDepth)	Looks up the given names against the given base file.
private DirectoryEntry	lookUpLast(File dir, Name name, Set<? super LinkOption> options, int linkDepth)	Looks up the last element of a path.
private Directory	toDirectory(File file)

Methods inherited from class java.lang.Object

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

Field Details

MAX_SYMBOLIC_LINK_DEPTH

private static final int MAX_SYMBOLIC_LINK_DEPTH

Doesn't much matter, but this number comes from MIN_ELOOP_THRESHOLD here

See Also:

• Constant Field Values

EMPTY_PATH_NAMES

private static final List<Name> EMPTY_PATH_NAMES

roots

private final SortedMap<Name,Directory> roots

Map of root names to root directories.

Constructor Details

FileTree

FileTree(Map<Name,Directory> roots)

Creates a new file tree with the given root directories.

Method Details

getRootDirectoryNames

public SortedSet<Name> getRootDirectoryNames()

Returns the names of the root directories in this tree.

getRoot

public DirectoryEntry getRoot(Name name)

Gets the directory entry for the root with the given name or null if no such root exists.

lookUp

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

Returns the result of the file lookup for the given path.

Throws:

IOException

lookUp

private DirectoryEntry lookUp(File dir,
 ZeroFsPath path,
 Set<? super LinkOption> options,
 int linkDepth)
                       throws IOException

Throws:

IOException

lookUp

private DirectoryEntry lookUp(File dir,
 Iterable<Name> names,
 Set<? super LinkOption> options,
 int linkDepth)
                       throws IOException

Looks up the given names against the given base file. If the file is not a directory, the lookup fails.

Throws:

IOException

lookUpLast

private DirectoryEntry lookUpLast(File dir,
 Name name,
 Set<? super LinkOption> options,
 int linkDepth)
                           throws IOException

Looks up the last element of a path.

Throws:

IOException

followSymbolicLink

private DirectoryEntry followSymbolicLink(File dir,
 SymbolicLink link,
 int linkDepth)
                                   throws IOException

Returns the directory entry located by the target path of the given symbolic link, resolved relative to the given directory.

Throws:

IOException

getRealEntry

private DirectoryEntry getRealEntry(DirectoryEntry entry)

Returns the entry for the file in its parent directory. This will be the given entry unless the name for the entry is "." or "..", in which the directory linking to the file is not the file's parent directory. In that case, we know the file must be a directory ("." and ".." can only link to directories), so we can just get the entry in the directory's parent directory that links to it. So, for example, if we have a directory "foo" that contains a directory "bar" and we find an entry [bar -> "." -> bar], we instead return the entry for bar in its parent, [foo -> "bar" -> bar].

toDirectory

private Directory toDirectory(File file)

isEmpty

private static boolean isEmpty(List<Name> names)