org.jboss.vfs.spi

Class RootFileSystem

java.lang.Object

org.jboss.vfs.spi.RootFileSystem

All Implemented Interfaces:

java.io.Closeable, java.lang.AutoCloseable, FileSystem

public final class RootFileSystem
extends java.lang.Object
implements FileSystem

A special FileSystem which supports multiple roots.

This is currently accomplished by requiring that VirtualFile.getPathName() produce output that is consumable by java.io.File as a path.

Field Summary

Fields

Modifier and Type	Field and Description
static RootFileSystem	ROOT_INSTANCE

Constructor Summary

Constructors

Modifier	Constructor and Description
private	RootFileSystem()

Method Summary

Modifier and Type	Method and Description
void	close() Destroy this filesystem instance.
boolean	delete(VirtualFile mountPoint, VirtualFile target) Attempt to delete a virtual file within this filesystem.
boolean	exists(VirtualFile mountPoint, VirtualFile target) Ascertain the existance of a virtual file within this filesystem.
java.security.CodeSigner[]	getCodeSigners(VirtualFile mountPoint, VirtualFile target) Get the CodeSigners for a the virtual file.
java.util.List<java.lang.String>	getDirectoryEntries(VirtualFile mountPoint, VirtualFile target) Read a directory.
java.io.File	getFile(VirtualFile mountPoint, VirtualFile target) Get a real File for the given path within this filesystem.
long	getLastModified(VirtualFile mountPoint, VirtualFile target) Get the last modification time of a virtual file within this filesystem.
java.io.File	getMountSource() Get the File source provided at mount time.
java.net.URI	getRootURI() Get the root URI for this file system, or null if there is no valid root URI.
long	getSize(VirtualFile mountPoint, VirtualFile target) Get the size of a virtual file within this filesystem.
boolean	isDirectory(VirtualFile mountPoint, VirtualFile target) Ascertain whether a virtual file within this filesystem is a directory.
boolean	isFile(VirtualFile mountPoint, VirtualFile target) Ascertain whether a virtual file within this filesystem is a plain file.
boolean	isReadOnly() Determine whether this filesystem is read-only.
java.io.InputStream	openInputStream(VirtualFile mountPoint, VirtualFile target) Open an input stream for the file at the given relative path.

Methods inherited from class java.lang.Object

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

Field Detail

ROOT_INSTANCE

public static final RootFileSystem ROOT_INSTANCE

Constructor Detail

RootFileSystem

private RootFileSystem()

Method Detail

openInputStream

public java.io.InputStream openInputStream(VirtualFile mountPoint,
                                           VirtualFile target)
                                    throws java.io.IOException

Open an input stream for the file at the given relative path.

Specified by:

openInputStream in interface FileSystem

Parameters:

mountPoint - the mount point of the filesystem instance (guaranteed to be a parent of target)

target - the virtual file to act upon

Returns:

the input stream

Throws:

java.io.IOException - if an I/O error occurs

isReadOnly

public boolean isReadOnly()

Determine whether this filesystem is read-only. A read-only filesystem prohibits file modification or deletion. It is not an error to mount a read-write filesystem within a read-only filesystem however (this operation does not take place within the FileSystem implementation).

Specified by:

isReadOnly in interface FileSystem

Returns:

true if the filesystem is read-only

getFile

public java.io.File getFile(VirtualFile mountPoint,
                            VirtualFile target)

Get a real File for the given path within this filesystem. Some filesystem types will need to make a copy in order to return this file; such copies should be cached and retained until the filesystem is closed. Depending on the file type, the real path of the returned File may or may not bear a relationship to the virtual path provided; if such a relationship is required, it must be negotiated at the time the filesystem is mounted.

Specified by:

getFile in interface FileSystem

Parameters:

mountPoint - the mount point of the filesystem instance (guaranteed to be a parent of target)

target - the virtual file to act upon

Returns:

the file instance

delete

public boolean delete(VirtualFile mountPoint,
                      VirtualFile target)

Attempt to delete a virtual file within this filesystem.

Specified by:

delete in interface FileSystem

Parameters:

mountPoint - the mount point of the filesystem instance (guaranteed to be a parent of target)

target - the virtual file to act upon

Returns:

true if the file was deleted, false if it failed for any reason

getSize

public long getSize(VirtualFile mountPoint,
                    VirtualFile target)

Get the size of a virtual file within this filesystem.

Specified by:

getSize in interface FileSystem

Parameters:

mountPoint - the mount point of the filesystem instance (guaranteed to be a parent of target)

target - the virtual file to act upon

Returns:

the size, in bytes, or 0L if the file does not exist or is a directory

getLastModified

public long getLastModified(VirtualFile mountPoint,
                            VirtualFile target)

Get the last modification time of a virtual file within this filesystem.

Specified by:

getLastModified in interface FileSystem

Parameters:

mountPoint - the mount point of the filesystem instance (guaranteed to be a parent of target)

target - the virtual file to act upon

Returns:

the modification time in milliseconds, or 0L if the file does not exist or if an error occurs

exists

public boolean exists(VirtualFile mountPoint,
                      VirtualFile target)

Ascertain the existance of a virtual file within this filesystem.

Specified by:

exists in interface FileSystem

Parameters:

mountPoint - the mount point of the filesystem instance (guaranteed to be a parent of target)

target - the virtual file to act upon

Returns:

true if the file exists, false otherwise

isFile

public boolean isFile(VirtualFile mountPoint,
                      VirtualFile target)

Ascertain whether a virtual file within this filesystem is a plain file.

Specified by:

isFile in interface FileSystem

Parameters:

mountPoint - the mount point of the filesystem instance (guaranteed to be a parent of target)

target - the virtual file to act upon

Returns:

true if the file exists and is a plain file, false otherwise

isDirectory

public boolean isDirectory(VirtualFile mountPoint,
                           VirtualFile target)

Ascertain whether a virtual file within this filesystem is a directory.

Specified by:

isDirectory in interface FileSystem

Parameters:

mountPoint - the mount point of the filesystem instance (guaranteed to be a parent of target)

target - the virtual file to act upon

Returns:

true if the file exists and is a directory, false otherwise

getDirectoryEntries

public java.util.List<java.lang.String> getDirectoryEntries(VirtualFile mountPoint,
                                                            VirtualFile target)

Read a directory. Returns all the simple path names (excluding "." and ".."). The returned list will be empty if the node is not a directory.

Specified by:

getDirectoryEntries in interface FileSystem

Parameters:

mountPoint - the mount point of the filesystem instance (guaranteed to be a parent of target)

target - the virtual file to act upon

Returns:

the collection of children names

getCodeSigners

public java.security.CodeSigner[] getCodeSigners(VirtualFile mountPoint,
                                                 VirtualFile target)

Get the CodeSigners for a the virtual file.

Specified by:

getCodeSigners in interface FileSystem

Parameters:

mountPoint - the mount point of the filesystem instance (guaranteed to be a parent of target)

target - the virtual file to act upon

Returns:

CodeSigner for the virtual file or null if not signed.

getMountSource

public java.io.File getMountSource()

Get the File source provided at mount time.

Specified by:

getMountSource in interface FileSystem

Returns:

the source used for mounting

getRootURI

public java.net.URI getRootURI()
                        throws java.net.URISyntaxException

Description copied from interface: FileSystem

Get the root URI for this file system, or null if there is no valid root URI.

Specified by:

getRootURI in interface FileSystem

Returns:

the root URI

Throws:

java.net.URISyntaxException - if the URI isn't valid

close

public void close()
           throws java.io.IOException

Destroy this filesystem instance. After this method is called, the filesystem may not be used in any way. This method should be called only after all mounts of this filesystem have been cleared; otherwise, VFS accesses may result in IOExceptions.

Specified by:

close in interface java.io.Closeable

Specified by:

close in interface java.lang.AutoCloseable

Specified by:

close in interface FileSystem

Throws:

java.io.IOException - if an I/O error occurs during close