org.apache.commons.vfs2.cache

Class OnCallRefreshFileObject

java.lang.Object

org.apache.commons.vfs2.impl.DecoratedFileObject

org.apache.commons.vfs2.cache.OnCallRefreshFileObject

All Implemented Interfaces:

FileObject

public class OnCallRefreshFileObject
extends DecoratedFileObject

This decorator refreshes the fileObject data on every call.

Version:

$Revision: 1035157 $ $Date: 2010-11-15 12:11:38 +0530 (Mon, 15 Nov 2010) $

Author:

Commons VFS team

Constructor Summary

Constructors

Constructor and Description
OnCallRefreshFileObject(FileObject fileObject)

Method Summary

Methods

Modifier and Type	Method and Description
void	close() Closes this file, and its content.
void	copyFrom(FileObject srcFile, FileSelector selector) Copies another file, and all its descendents, to this file.
void	createFile() Creates this file, if it does not exist.
void	createFolder() Creates this folder, if it does not exist.
boolean	delete() Deletes this file.
int	delete(FileSelector selector) Deletes all descendents of this file that match a selector.
boolean	exists() Determines if this file exists.
FileObject[]	findFiles(FileSelector selector) Finds the set of matching descendents of this file, in depthwise order.
void	findFiles(FileSelector selector, boolean depthwise, List<FileObject> selected) Finds the set of matching descendents of this file.
FileObject	getChild(String name) Returns a child of this file.
FileObject[]	getChildren() Lists the children of this file.
FileContent	getContent() Returns this file's content.
FileType	getType() Returns this file's type.
boolean	isHidden() Determines if this file is hidden.
boolean	isReadable() Determines if this file can be read.
boolean	isWriteable() Determines if this file can be written to.
void	moveTo(FileObject destFile) Move this file.
FileObject	resolveFile(String path) Finds a file, relative to this file.
FileObject	resolveFile(String name, NameScope scope) Finds a file, relative to this file.

Methods inherited from class org.apache.commons.vfs2.impl.DecoratedFileObject

canRenameTo, getDecoratedFileObject, getFileOperations, getFileSystem, getName, getParent, getURL, isAttached, isContentOpen, refresh, toString

Methods inherited from class java.lang.Object

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

Constructor Detail

OnCallRefreshFileObject

public OnCallRefreshFileObject(FileObject fileObject)

Method Detail

close

public void close()
           throws FileSystemException

Description copied from interface: FileObject

Closes this file, and its content. This method is a hint to the implementation that it can release any resources associated with the file.

The file object can continue to be used after this method is called.

Specified by:

close in interface FileObject

Overrides:

close in class DecoratedFileObject

Throws:

FileSystemException - On error closing the file.

See Also:

FileContent.close()

copyFrom

public void copyFrom(FileObject srcFile,
            FileSelector selector)
              throws FileSystemException

Description copied from interface: FileObject

Copies another file, and all its descendents, to this file.

If this file does not exist, it is created. Its parent folder is also created, if necessary. If this file does exist, it is deleted first.

This method is not transactional. If it fails and throws an exception, this file will potentially only be partially copied.

Specified by:

copyFrom in interface FileObject

Overrides:

copyFrom in class DecoratedFileObject

Parameters:

srcFile - The source file to copy.

selector - The selector to use to select which files to copy.

Throws:

FileSystemException - If this file is read-only, or if the source file does not exist, or on error copying the file.

createFile

public void createFile()
                throws FileSystemException

Description copied from interface: FileObject

Creates this file, if it does not exist. Also creates any ancestor folders which do not exist. This method does nothing if the file already exists and is a file.

Specified by:

createFile in interface FileObject

Overrides:

createFile in class DecoratedFileObject

Throws:

FileSystemException - If the file already exists with the wrong type, or the parent folder is read-only, or on error creating this file or one of its ancestors.

createFolder

public void createFolder()
                  throws FileSystemException

Description copied from interface: FileObject

Creates this folder, if it does not exist. Also creates any ancestor folders which do not exist. This method does nothing if the folder already exists.

Specified by:

createFolder in interface FileObject

Overrides:

createFolder in class DecoratedFileObject

Throws:

FileSystemException - If the folder already exists with the wrong type, or the parent folder is read-only, or on error creating this folder or one of its ancestors.

delete

public boolean delete()
               throws FileSystemException

Description copied from interface: FileObject

Deletes this file. Does nothing if this file does not exist of if it is a folder that has children. Does not delete any descendents of this file, use FileObject.delete(FileSelector) for that.

Specified by:

delete in interface FileObject

Overrides:

delete in class DecoratedFileObject

Returns:

true if this object has been deleted

Throws:

FileSystemException - If this file is a non-empty folder, or if this file is read-only, or on error deleteing this file.

delete

public int delete(FileSelector selector)
           throws FileSystemException

Description copied from interface: FileObject

Deletes all descendents of this file that match a selector. Does nothing if this file does not exist.

This method is not transactional. If it fails and throws an exception, this file will potentially only be partially deleted.

Specified by:

delete in interface FileObject

Overrides:

delete in class DecoratedFileObject

Parameters:

selector - The selector to use to select which files to delete.

Returns:

the number of deleted objects

Throws:

FileSystemException - If this file or one of its descendents is read-only, or on error deleting this file or one of its descendents.

exists

public boolean exists()
               throws FileSystemException

Description copied from interface: FileObject

Determines if this file exists.

Specified by:

exists in interface FileObject

Overrides:

exists in class DecoratedFileObject

Returns:

true if this file exists, false if not.

Throws:

FileSystemException - On error determining if this file exists.

findFiles

public void findFiles(FileSelector selector,
             boolean depthwise,
             List<FileObject> selected)
               throws FileSystemException

Description copied from interface: FileObject

Finds the set of matching descendents of this file.

Specified by:

findFiles in interface FileObject

Overrides:

findFiles in class DecoratedFileObject

Parameters:

selector - the selector used to determine if the file should be selected

depthwise - controls the ordering in the list. e.g. deepest first

selected - container for selected files. list needs not to be empty.

Throws:

FileSystemException - if an error occurs.

findFiles

public FileObject[] findFiles(FileSelector selector)
                       throws FileSystemException

Description copied from interface: FileObject

Finds the set of matching descendents of this file, in depthwise order.

Specified by:

findFiles in interface FileObject

Overrides:

findFiles in class DecoratedFileObject

Parameters:

selector - The selector to use to select matching files.

Returns:

The matching files. The files are returned in depthwise order (that is, a child appears in the list before its parent).

Throws:

FileSystemException - if an error occurs.

getChild

public FileObject getChild(String name)
                    throws FileSystemException

Description copied from interface: FileObject

Returns a child of this file. Note that this method returns null when the child does not exist. This differs from FileObject.resolveFile( String, NameScope) which never returns null.

Specified by:

getChild in interface FileObject

Overrides:

getChild in class DecoratedFileObject

Parameters:

name - The name of the child.

Returns:

The child, or null if there is no such child.

Throws:

FileSystemException - If this file does not exist, or is not a folder, or on error determining this file's children.

getChildren

public FileObject[] getChildren()
                         throws FileSystemException

Description copied from interface: FileObject

Lists the children of this file.

Specified by:

getChildren in interface FileObject

Overrides:

getChildren in class DecoratedFileObject

Returns:

An array containing the children of this file. The array is unordered. If the file does not have any children, a zero-length array is returned. This method never returns null.

Throws:

FileSystemException - If this file does not exist, or is not a folder, or on error listing this file's children.

getContent

public FileContent getContent()
                       throws FileSystemException

Description copied from interface: FileObject

Returns this file's content. The FileContent returned by this method can be used to read and write the content of the file.

This method can be called if the file does not exist, and the returned FileContent can be used to create the file by writing its content.

Specified by:

getContent in interface FileObject

Overrides:

getContent in class DecoratedFileObject

Returns:

This file's content.

Throws:

FileSystemException - On error getting this file's content.

getType

public FileType getType()
                 throws FileSystemException

Description copied from interface: FileObject

Returns this file's type.

Specified by:

getType in interface FileObject

Overrides:

getType in class DecoratedFileObject

Returns:

One of the FileType constants. Never returns null.

Throws:

FileSystemException - On error determining the file's type.

isHidden

public boolean isHidden()
                 throws FileSystemException

Description copied from interface: FileObject

Determines if this file is hidden.

Specified by:

isHidden in interface FileObject

Overrides:

isHidden in class DecoratedFileObject

Returns:

true if this file is hidden, false if not.

Throws:

FileSystemException - On error determining if this file exists.

isReadable

public boolean isReadable()
                   throws FileSystemException

Description copied from interface: FileObject

Determines if this file can be read.

Specified by:

isReadable in interface FileObject

Overrides:

isReadable in class DecoratedFileObject

Returns:

true if this file is readable, false if not.

Throws:

FileSystemException - On error determining if this file exists.

isWriteable

public boolean isWriteable()
                    throws FileSystemException

Description copied from interface: FileObject

Determines if this file can be written to.

Specified by:

isWriteable in interface FileObject

Overrides:

isWriteable in class DecoratedFileObject

Returns:

true if this file is writeable, false if not.

Throws:

FileSystemException - On error determining if this file exists.

moveTo

public void moveTo(FileObject destFile)
            throws FileSystemException

Description copied from interface: FileObject

Move this file.

If the destFile exists, it is deleted first

Specified by:

moveTo in interface FileObject

Overrides:

moveTo in class DecoratedFileObject

Parameters:

destFile - the New filename.

Throws:

FileSystemException - If this file is read-only, or if the source file does not exist, or on error copying the file.

resolveFile

public FileObject resolveFile(String name,
                     NameScope scope)
                       throws FileSystemException

Description copied from interface: FileObject

Finds a file, relative to this file. Refer to NameScope for a description of how names are resolved in the different scopes.

Specified by:

resolveFile in interface FileObject

Overrides:

resolveFile in class DecoratedFileObject

Parameters:

name - The name to resolve.

scope - the NameScope for the file.

Returns:

The file.

Throws:

FileSystemException - On error parsing the path, or on error finding the file.

resolveFile

public FileObject resolveFile(String path)
                       throws FileSystemException

Description copied from interface: FileObject

Finds a file, relative to this file. Equivalent to calling resolveFile( path, NameScope.FILE_SYSTEM ).

Specified by:

resolveFile in interface FileObject

Overrides:

resolveFile in class DecoratedFileObject

Parameters:

path - The path of the file to locate. Can either be a relative path or an absolute path.

Returns:

The file.

Throws:

FileSystemException - On error parsing the path, or on error finding the file.