FileObject (Commons VFS Core 2.0-wso2v16 API)

All Known Implementing Classes:

AbstractFileObject, Bzip2FileObject, CompressedFileFileObject, DecoratedFileObject, DelegateFileObject, FtpFileObject, GzipFileObject, HttpFileObject, JarFileObject, LocalFile, OnCallRefreshFileObject, RamFileObject, SftpFileObject, SynchronizedFileObject, TarFileObject, UrlFileObject, WebdavFileObject, ZipFileObject
```
public interface FileObject
```
Represents a file, and is used to access the content and structure of the file.

Files are arranged in a hierarchy. Each hierachy forms a file system. A file system represents things like a local OS file system, a windows share, an HTTP server, or the contents of a Zip file.

There are two types of files: Folders, which contain other files, and normal files, which contain data, or content. A folder may not have any content, and a normal file cannot contain other files.

File Naming

TODO - write this.

Reading and Writing a File

Reading and writing a file, and all other operations on the file's content, is done using the FileContent object returned by getContent().

Creating and Deleting a File

A file is created using either createFolder(), createFile(), or by writing to the file using one of the FileContent methods.

A file is deleted using delete(). Recursive deletion can be done using delete(FileSelector).

Finding Files

Other files in the same file system as this file can be found using:
- resolveFile(java.lang.String, org.apache.commons.vfs2.NameScope) to find another file relative to this file.
- getChildren() and getChild(java.lang.String) to find the children of this file.
- getParent() to find the folder containing this file.
- getFileSystem() to find another file in the same file system.
To find files in another file system, use a FileSystemManager.
Version:

$Revision: 1035154 $ $Date: 2010-11-15 11:58:06 +0530 (Mon, 15 Nov 2010) $

Author:

Commons VFS team

See Also:
FileSystemManager, FileContent, FileName

Method Summary

Methods
Modifier and Type	Method and Description
`boolean`	`canRenameTo(FileObject newfile)` Queries the file if it is possible to rename it to newfile.
`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.
`FileOperations`	`getFileOperations()`
`FileSystem`	`getFileSystem()` Returns the file system that contains this file.
`FileName`	`getName()` Returns the name of this file.
`FileObject`	`getParent()` Returns the folder that contains this file.
`FileType`	`getType()` Returns this file's type.
`URL`	`getURL()` Returns a URL representing this file.
`boolean`	`isAttached()` check if the fileObject is attaced.
`boolean`	`isContentOpen()` check if someone reads/write to this file.
`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.
`void`	`refresh()` This will prepare the fileObject to get resynchronized with the underlaying filesystem if required.
`FileObject`	`resolveFile(String path)` Finds a file, relative to this file.
`FileObject`	`resolveFile(String name, NameScope scope)` Finds a file, relative to this file.

- Method Detail
  - getName
```
FileName getName()
```
    Returns the name of this file.
    
    Returns:
    the FileName.
  - getURL
```
URL getURL()
           throws FileSystemException
```
    Returns a URL representing this file.
    
    Returns:
    the URL for the file.
    
    Throws:
    
    FileSystemException - if an error occurs.
  - exists
```
boolean exists()
               throws FileSystemException
```
    Determines if this file exists.
    
    Returns:
    true if this file exists, false if not.
    
    Throws:
    
    FileSystemException - On error determining if this file exists.
  - isHidden
```
boolean isHidden()
                 throws FileSystemException
```
    Determines if this file is hidden.
    
    Returns:
    true if this file is hidden, false if not.
    
    Throws:
    
    FileSystemException - On error determining if this file exists.
  - isReadable
```
boolean isReadable()
                   throws FileSystemException
```
    Determines if this file can be read.
    
    Returns:
    true if this file is readable, false if not.
    
    Throws:
    
    FileSystemException - On error determining if this file exists.
  - isWriteable
```
boolean isWriteable()
                    throws FileSystemException
```
    Determines if this file can be written to.
    
    Returns:
    true if this file is writeable, false if not.
    
    Throws:
    
    FileSystemException - On error determining if this file exists.
  - getType
```
FileType getType()
                 throws FileSystemException
```
    Returns this file's type.
    
    Returns:
    One of the FileType constants. Never returns null.
    
    Throws:
    
    FileSystemException - On error determining the file's type.
  - getParent
```
FileObject getParent()
                     throws FileSystemException
```
    Returns the folder that contains this file.
    
    Returns:
    The folder that contains this file. Returns null if this file is the root of a file system.
    
    Throws:
    
    FileSystemException - On error finding the file's parent.
  - getFileSystem
```
FileSystem getFileSystem()
```
    Returns the file system that contains this file.
    
    Returns:
    The file system.
  - getChildren
```
FileObject[] getChildren()
                         throws FileSystemException
```
    Lists the children of this file.
    
    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.
  - getChild
```
FileObject getChild(String name)
                    throws FileSystemException
```
    Returns a child of this file. Note that this method returns null when the child does not exist. This differs from resolveFile( String, NameScope) which never returns null.
    
    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.
  - resolveFile
```
FileObject resolveFile(String name,
                     NameScope scope)
                       throws FileSystemException
```
    Finds a file, relative to this file. Refer to NameScope for a description of how names are resolved in the different scopes.
    
    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
```
FileObject resolveFile(String path)
                       throws FileSystemException
```
    Finds a file, relative to this file. Equivalent to calling resolveFile( path, NameScope.FILE_SYSTEM ).
    
    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.
  - findFiles
```
FileObject[] findFiles(FileSelector selector)
                       throws FileSystemException
```
    Finds the set of matching descendents of this file, in depthwise order.
    
    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.
  - findFiles
```
void findFiles(FileSelector selector,
             boolean depthwise,
             List<FileObject> selected)
               throws FileSystemException
```
    Finds the set of matching descendents of this file.
    
    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.
  - delete
```
boolean delete()
               throws FileSystemException
```
    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 delete(FileSelector) for that.
    
    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
```
int delete(FileSelector selector)
           throws FileSystemException
```
    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.
    
    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.
  - createFolder
```
void createFolder()
                  throws FileSystemException
```
    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.
    
    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.
  - createFile
```
void createFile()
                throws FileSystemException
```
    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.
    
    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.
  - copyFrom
```
void copyFrom(FileObject srcFile,
            FileSelector selector)
              throws FileSystemException
```
    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.
    
    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.
  - moveTo
```
void moveTo(FileObject destFile)
            throws FileSystemException
```
    Move this file.
    If the destFile exists, it is deleted first
    
    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.
  - canRenameTo
```
boolean canRenameTo(FileObject newfile)
```
    Queries the file if it is possible to rename it to newfile.
    
    Parameters:
    newfile - the new file(-name)
    
    Returns:
    true it this is the case
  - getContent
```
FileContent getContent()
                       throws FileSystemException
```
    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.
    
    Returns:
    This file's content.
    
    Throws:
    
    FileSystemException - On error getting this file's content.
  - close
```
void close()
           throws FileSystemException
```
    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.
    
    Throws:
    
    FileSystemException - On error closing the file.
    See Also:
    FileContent.close()
  - refresh
```
void refresh()
             throws FileSystemException
```
    This will prepare the fileObject to get resynchronized with the underlaying filesystem if required.
    
    Throws:
    
    FileSystemException - if an error occurs.
  - isAttached
```
boolean isAttached()
```
    check if the fileObject is attaced.
    
    Returns:
    true if the FileObject is attached.
  - isContentOpen
```
boolean isContentOpen()
```
    check if someone reads/write to this file.
    
    Returns:
    true if the file content is open.
  - getFileOperations
```
FileOperations getFileOperations()
                                 throws FileSystemException
```
    Returns:
    FileOperations interface that provides access to the operations API.
    
    Throws:
    
    FileSystemException - if an error occurs.

Interface FileObject

File Naming

Reading and Writing a File

Creating and Deleting a File

Finding Files

Method Summary

Method Detail

getName

getURL

exists

isHidden

isReadable

isWriteable

getType

getParent

getFileSystem

getChildren

getChild

resolveFile

resolveFile

findFiles

findFiles

delete

delete

createFolder

createFile

copyFrom

moveTo

canRenameTo

getContent

close

refresh

isAttached

isContentOpen

getFileOperations