org.planx.xmlstore.io
Class MemoryFileSystem

java.lang.Object
  org.planx.xmlstore.io.MemoryFileSystem

All Implemented Interfaces:

FileSystem

public class MemoryFileSystem
extends Object
implements FileSystem

Author:

Thomas Ambus

Constructor Summary

MemoryFileSystem()

MemoryFileSystem(int capacity)

MemoryFileSystem(int capacity, FileSystemIdentifier fsi)

Method Summary

LocalLocator	all() Returns a LocalLocator to all content currently in this FileSystem.
LocalLocator	allocate() Always succeeds and allocates space at end of buffer, writes must be done before the next allocation.
LocalLocator	allocate(int size)
LocalLocator	allocate(int size, FileSystemIdentifier id)
void	clear() Frees all data and generates a new FileSystemIdentifier.
void	clear(FileSystemIdentifier fsi) Frees all data and sets the FileSystemIdentifier to the specified object.
void	close() No effect.
void	copy(FileSystem fs, LocalLocator fromLoc, LocalLocator locTo) Copies the data at fromLoc in the specified FileSystem to toLoc in this FileSystem.
FileSystemIdentifier	currentIdentifier()
void	free(LocalLocator loc) Does nothing.
DataInput	getInput(LocalLocator l) Positions the input at the specified location and returns a DataInput for reading.
DataOutput	getOutput(LocalLocator l) Only append allowed.
boolean	isContained(LocalLocator l) Returns true if the specified LocalLocator originates from this FileSystem.
long	size() Returns the size of the FileSystem.

Methods inherited from class java.lang.Object

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

Constructor Detail

MemoryFileSystem

public MemoryFileSystem()

MemoryFileSystem

public MemoryFileSystem(int capacity)

MemoryFileSystem

public MemoryFileSystem(int capacity,
                        FileSystemIdentifier fsi)

Method Detail

currentIdentifier

public FileSystemIdentifier currentIdentifier()

Specified by:

currentIdentifier in interface FileSystem

allocate

public LocalLocator allocate()
                      throws IOException

Always succeeds and allocates space at end of buffer, writes must be done before the next allocation.

Specified by:

allocate in interface FileSystem

Throws:

IOException

allocate

public LocalLocator allocate(int size)
                      throws IOException

Specified by:

allocate in interface FileSystem

Throws:

IOException

allocate

public LocalLocator allocate(int size,
                             FileSystemIdentifier id)
                      throws IOException

Specified by:

allocate in interface FileSystem

Throws:

IOException

all

public LocalLocator all()

Description copied from interface: FileSystem

Returns a LocalLocator to all content currently in this FileSystem.

Specified by:

all in interface FileSystem

free

public void free(LocalLocator loc)
          throws IOException,
                 UnknownLocatorException

Does nothing.

Specified by:

free in interface FileSystem

Throws:

IOException

UnknownLocatorException

clear

public void clear()

Frees all data and generates a new FileSystemIdentifier.

clear

public void clear(FileSystemIdentifier fsi)

Frees all data and sets the FileSystemIdentifier to the specified object.

getInput

public DataInput getInput(LocalLocator l)
                   throws IOException,
                          UnknownLocatorException

Description copied from interface: FileSystem

Positions the input at the specified location and returns a DataInput for reading. The DataInput is shared so if multiple threads operate on the same FileSystem concurrently, external synchronization should be used.

Specified by:

getInput in interface FileSystem

Throws:

IOException

UnknownLocatorException

getOutput

public DataOutput getOutput(LocalLocator l)
                     throws IOException,
                            UnknownLocatorException

Only append allowed.

Specified by:

getOutput in interface FileSystem

Throws:

IOException

UnknownLocatorException

copy

public void copy(FileSystem fs,
                 LocalLocator fromLoc,
                 LocalLocator locTo)
          throws IOException,
                 UnknownLocatorException

Description copied from interface: FileSystem

Copies the data at fromLoc in the specified FileSystem to toLoc in this FileSystem.

Specified by:

copy in interface FileSystem

Throws:

IOException

UnknownLocatorException

size

public long size()
          throws IOException

Description copied from interface: FileSystem

Returns the size of the FileSystem.

Specified by:

size in interface FileSystem

Throws:

IOException

close

public void close()
           throws IOException

No effect.

Specified by:

close in interface FileSystem

Throws:

IOException

isContained

public boolean isContained(LocalLocator l)

Description copied from interface: FileSystem

Returns true if the specified LocalLocator originates from this FileSystem.

Specified by:

isContained in interface FileSystem