org.apache.commons.vfs2.provider.ram

Class RamFileObject

java.lang.Object

org.apache.commons.vfs2.provider.AbstractFileObject<RamFileSystem>

org.apache.commons.vfs2.provider.ram.RamFileObject

All Implemented Interfaces:

java.io.Closeable, java.lang.AutoCloseable, java.lang.Comparable<FileObject>, java.lang.Iterable<FileObject>, FileObject

public class RamFileObject
extends AbstractFileObject<RamFileSystem>

A RAM File contains a single RAM FileData instance, it provides methods to access the data by implementing FileObject interface.

Field Summary

Fields

Modifier and Type	Field and Description
private RamFileData	data RAM File Object Data.

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	RamFileObject(AbstractFileName name, RamFileSystem fs)

Method Summary

Modifier and Type	Method and Description
protected void	doAttach() Attaches this file object to its file resource.
protected void	doCreateFolder() Creates this file as a folder.
protected void	doDelete() Deletes the file.
protected long	doGetContentSize() Returns the size of the file content (in bytes).
protected java.io.InputStream	doGetInputStream() Creates an input stream to read the file content from.
protected long	doGetLastModifiedTime() Returns the last modified time of this file.
protected java.io.OutputStream	doGetOutputStream(boolean bAppend) Creates an output stream to write the file content to.
protected RandomAccessContent	doGetRandomAccessContent(RandomAccessMode mode) Creates access to the file for random i/o.
protected FileType	doGetType() Determines the type of this file.
protected java.lang.String[]	doListChildren() Lists the children of this file.
protected void	doRename(FileObject newFile) Renames the file.
protected boolean	doSetLastModifiedTime(long modtime) Sets the last modified time of this file.
protected void	endOutput() Called when the output stream for this file is closed.
(package private) RamFileData	getData()
protected void	injectType(FileType fileType)
(package private) void	resize(long newSize)
private void	save()
(package private) void	setData(RamFileData data)
(package private) int	size()

Methods inherited from class org.apache.commons.vfs2.provider.AbstractFileObject

canRenameTo, childrenChanged, close, compareTo, copyFrom, createFile, createFolder, delete, delete, deleteAll, doCreateFileContent, doDetach, doGetAttributes, doGetCertificates, doIsExecutable, doIsHidden, doIsReadable, doIsSameFile, doIsSymbolicLink, doIsWriteable, doListChildrenResolved, doRemoveAttribute, doSetAttribute, doSetExecutable, doSetReadable, doSetWritable, exists, finalize, findFiles, findFiles, getAbstractFileSystem, getChild, getChildren, getContent, getFileContentInfoFactory, getFileOperations, getFileSystem, getInputStream, getName, getOutputStream, getOutputStream, getParent, getPublicURIString, getRandomAccessContent, getType, getURL, handleChanged, handleCreate, handleDelete, holdObject, isAttached, isContentOpen, isExecutable, isFile, isFolder, isHidden, isReadable, isSameFile, isSymbolicLink, isWriteable, iterator, listFiles, moveTo, notifyAllStreamsClosed, onChange, onChildrenChanged, refresh, resolveFile, resolveFile, setExecutable, setReadable, setWritable, toString

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.lang.Iterable

forEach, spliterator

Field Detail

data

private RamFileData data

RAM File Object Data.

Constructor Detail

RamFileObject

protected RamFileObject(AbstractFileName name,
                        RamFileSystem fs)

Parameters:

name - The name of the file.

fs - The FileSystem.

Method Detail

save

private void save()
           throws FileSystemException

Throws:

FileSystemException

doGetType

protected FileType doGetType()
                      throws java.lang.Exception

Description copied from class: AbstractFileObject

Determines the type of this file. Must not return null. The return value of this method is cached, so the implementation can be expensive.

Specified by:

doGetType in class AbstractFileObject<RamFileSystem>

Returns:

the type of the file.

Throws:

java.lang.Exception - if an error occurs.

doListChildren

protected java.lang.String[] doListChildren()
                                     throws java.lang.Exception

Description copied from class: AbstractFileObject

Lists the children of this file. Is only called if AbstractFileObject.doGetType() returns FileType.FOLDER. The return value of this method is cached, so the implementation can be expensive.

Specified by:

doListChildren in class AbstractFileObject<RamFileSystem>

Returns:

a possible empty String array if the file is a directory or null or an exception if the file is not a directory or can't be read.

Throws:

java.lang.Exception - if an error occurs.

doGetContentSize

protected long doGetContentSize()
                         throws java.lang.Exception

Description copied from class: AbstractFileObject

Returns the size of the file content (in bytes). Is only called if AbstractFileObject.doGetType() returns FileType.FILE.

Specified by:

doGetContentSize in class AbstractFileObject<RamFileSystem>

Returns:

The size of the file in bytes.

Throws:

java.lang.Exception - if an error occurs.

doGetInputStream

protected java.io.InputStream doGetInputStream()
                                        throws java.lang.Exception

Description copied from class: AbstractFileObject

Creates an input stream to read the file content from. Is only called if AbstractFileObject.doGetType() returns FileType.FILE.

It is guaranteed that there are no open output streams for this file when this method is called.

The returned stream does not have to be buffered.

Specified by:

doGetInputStream in class AbstractFileObject<RamFileSystem>

Returns:

An InputStream to read the file content.

Throws:

java.lang.Exception - if an error occurs.

doGetOutputStream

protected java.io.OutputStream doGetOutputStream(boolean bAppend)
                                          throws java.lang.Exception

Description copied from class: AbstractFileObject

Creates an output stream to write the file content to. Is only called if:

• AbstractFileObject.doIsWriteable() returns true.
• AbstractFileObject.doGetType() returns FileType.FILE, or AbstractFileObject.doGetType() returns FileType.IMAGINARY, and the file's parent exists and is a folder.

It is guaranteed that there are no open stream (input or output) for this file when this method is called.

The returned stream does not have to be buffered.

This implementation throws an exception.

Overrides:

doGetOutputStream in class AbstractFileObject<RamFileSystem>

Parameters:

bAppend - true if the file should be appended to, false if it should be overwritten.

Returns:

An OutputStream to write to the file.

Throws:

java.lang.Exception - if an error occurs.

doDelete

protected void doDelete()
                 throws java.lang.Exception

Description copied from class: AbstractFileObject

Deletes the file. Is only called when:

• AbstractFileObject.doGetType() does not return FileType.IMAGINARY.
• AbstractFileObject.doIsWriteable() returns true.
• This file has no children, if a folder.

This implementation throws an exception.

Overrides:

doDelete in class AbstractFileObject<RamFileSystem>

Throws:

java.lang.Exception - if an error occurs.

doGetLastModifiedTime

protected long doGetLastModifiedTime()
                              throws java.lang.Exception

Description copied from class: AbstractFileObject

Returns the last modified time of this file. Is only called if AbstractFileObject.doGetType() does not return FileType.IMAGINARY.

This implementation throws an exception.

Overrides:

doGetLastModifiedTime in class AbstractFileObject<RamFileSystem>

Returns:

The last modification time.

Throws:

java.lang.Exception - if an error occurs.

doSetLastModifiedTime

protected boolean doSetLastModifiedTime(long modtime)
                                 throws java.lang.Exception

Description copied from class: AbstractFileObject

Sets the last modified time of this file.

Is only called if AbstractFileObject.doGetType() does not return FileType.IMAGINARY.

This implementation throws an exception.

Overrides:

doSetLastModifiedTime in class AbstractFileObject<RamFileSystem>

Parameters:

modtime - The last modification time.

Returns:

true if the time was set.

Throws:

java.lang.Exception - Any Exception thrown is wrapped in FileSystemException.

Since:

2.0

doCreateFolder

protected void doCreateFolder()
                       throws java.lang.Exception

Description copied from class: AbstractFileObject

Creates this file as a folder. Is only called when:

• AbstractFileObject.doGetType() returns FileType.IMAGINARY.
• The parent folder exists and is writeable, or this file is the root of the file system.

This implementation throws an exception.

Overrides:

doCreateFolder in class AbstractFileObject<RamFileSystem>

Throws:

java.lang.Exception - if an error occurs.

doRename

protected void doRename(FileObject newFile)
                 throws java.lang.Exception

Description copied from class: AbstractFileObject

Renames the file.

Is only called when:

• AbstractFileObject.doIsWriteable() returns true.

This implementation throws an exception.

Overrides:

doRename in class AbstractFileObject<RamFileSystem>

Parameters:

newFile - A FileObject with the new file name.

Throws:

java.lang.Exception - if an error occurs.

doGetRandomAccessContent

protected RandomAccessContent doGetRandomAccessContent(RandomAccessMode mode)
                                                throws java.lang.Exception

Description copied from class: AbstractFileObject

Creates access to the file for random i/o. Is only called if AbstractFileObject.doGetType() returns FileType.FILE.

It is guaranteed that there are no open output streams for this file when this method is called.

Overrides:

doGetRandomAccessContent in class AbstractFileObject<RamFileSystem>

Parameters:

mode - The mode to access the file.

Returns:

The RandomAccessContext.

Throws:

java.lang.Exception - if an error occurs.

doAttach

protected void doAttach()
                 throws java.lang.Exception

Description copied from class: AbstractFileObject

Attaches this file object to its file resource.

This method is called before any of the doBlah() or onBlah() methods. Sub-classes can use this method to perform lazy initialisation.

This implementation does nothing.

Overrides:

doAttach in class AbstractFileObject<RamFileSystem>

Throws:

java.lang.Exception - if an error occurs.

getData

RamFileData getData()

Returns:

Returns the data.

setData

void setData(RamFileData data)

Parameters:

data - The data to set.

injectType

protected void injectType(FileType fileType)

Overrides:

injectType in class AbstractFileObject<RamFileSystem>

endOutput

protected void endOutput()
                  throws java.lang.Exception

Description copied from class: AbstractFileObject

Called when the output stream for this file is closed.

Overrides:

endOutput in class AbstractFileObject<RamFileSystem>

Throws:

java.lang.Exception - if an error occurs.

size

int size()

Returns:

Returns the size of the RamFileData.

resize

void resize(long newSize)
     throws java.io.IOException

Parameters:

newSize -

Throws:

java.io.IOException - if the new size exceeds the limit