org.gjt.sp.jedit.io

## Class VFS

- java.lang.Object
- - org.gjt.sp.jedit.io.VFS

- Direct Known Subclasses:
    FavoritesVFS, FileRootsVFS, FileVFS, UrlVFS

      public abstract class VFS
      extends java.lang.Object

  A virtual filesystem implementation.

  Plugins can provide virtual file systems by defining entries in their `services.xml` files like so:

      <SERVICE CLASS="org.gjt.sp.jedit.io.VFS" NAME="name">
          new MyVFS();
      </SERVICE>

  URLs of the form `name:path` will then be handled by the VFS named `name`.

  See `ServiceManager` for details.

  ### Session objects:

  A session is used to persist things like login information, any network sockets, etc. File system implementations that do not need this kind of persistence return a dummy object as a session.

  Methods whose names are prefixed with "_" expect to be given a previously-obtained session object. A session must be obtained with this method:

  - `createVFSSession(String,Component)`
  That method should be called from the AWT (EDT) thread, unless the filesystem has `NON_AWT_SESSION_CAP` capability.

  When done, the session must be disposed of using `_endVFSSession(Object,Component)`.

  ### Thread safety:

  The following methods cannot be called from an I/O thread:
  - `createVFSSession(String,Component)` - unless `NON_AWT_SESSION_CAP` capability is set
  - `insert(View,Buffer,String)`
  - `load(View,Buffer,String)`
  - `save(View,Buffer,String)`
  All remaining methods are required to be thread-safe in subclasses.

  ### Implementing a VFS

  You can override as many or as few methods as you want. Make sure `getCapabilities()` returns a value reflecting the functionality implemented by your VFS.
  See Also:
    `VFSManager.getVFSForPath(String)`, `VFSManager.getVFSForProtocol(String)`

- - ### Nested Class Summary

    Nested Classes
    Modifier and Type | Class and Description
    --- | ---
    `static class` | `VFS.DirectoryEntryCompare` Implementation of `Comparator` interface that compares `VFSFile` instances.

  - ### Field Summary

    Fields
    Modifier and Type | Field and Description
    --- | ---
    `static int` | `BROWSE_CAP` Browse capability
    `static int` | `CASE_INSENSITIVE_CAP` Case insensitive file system capability.
    `static int` | `DELETE_CAP` Delete file capability.
    `static java.lang.String` | `EA_MODIFIED` File last modified date.
    `static java.lang.String` | `EA_SIZE` File size.
    `static java.lang.String` | `EA_STATUS` File status (read only, read write, etc).
    `static java.lang.String` | `EA_TYPE` File type.
    `static int` | `IOBUFSIZE`
    `static int` | `LOW_LATENCY_CAP` Low latency capability.
    `static int` | `MKDIR_CAP` Make directory capability.
    `static int` | `NON_AWT_SESSION_CAP` Sessions created outside Event Dispatching Thread - file system capability.
    `static int` | `READ_CAP` Read capability.
    `static int` | `RENAME_CAP` Rename file capability.
    `static int` | `WRITE_CAP` Write capability.

  - ### Constructor Summary

    Constructors
    Modifier | Constructor and Description
    --- | ---
    `protected` | `VFS(java.lang.String name, int caps)` Creates a new virtual filesystem.
    `protected` | `VFS(java.lang.String name, int caps, java.lang.String[] extAttrs)` Creates a new virtual filesystem.

  - ### Method Summary

    Methods
    Modifier and Type | Method and Description
    --- | ---
    `void` | `_backup(java.lang.Object session, java.lang.String path, java.awt.Component comp)` Backs up the specified file.
    `java.lang.String` | `_canonPath(java.lang.Object session, java.lang.String path, java.awt.Component comp)` Returns the canonical form of the specified path name.
    `java.io.InputStream` | `_createInputStream(java.lang.Object session, java.lang.String path, boolean ignoreErrors, java.awt.Component comp)` Creates an input stream.
    `java.io.OutputStream` | `_createOutputStream(java.lang.Object session, java.lang.String path, java.awt.Component comp)` Creates an output stream.
    `boolean` | `_delete(java.lang.Object session, java.lang.String path, java.awt.Component comp)` Deletes the specified URL.
    `void` | `_endVFSSession(java.lang.Object session, java.awt.Component comp)` Finishes the specified VFS session.
    `void` | `_finishTwoStageSave(java.lang.Object session, Buffer buffer, java.lang.String path, java.awt.Component comp)` Called after a file has been saved and we use twoStageSave (first saving to another file).
    `VFSFile` | `_getFile(java.lang.Object session, java.lang.String path, java.awt.Component comp)` Returns the specified directory entry.
    `java.lang.String[]` | `_listDirectory(java.lang.Object session, java.lang.String directory, java.lang.String glob, boolean recursive, java.awt.Component comp)` A convenience method that matches file names against globs, and can optionally list the directory recursively.
    `java.lang.String[]` | `_listDirectory(java.lang.Object session, java.lang.String directory, java.lang.String glob, boolean recursive, java.awt.Component comp, boolean skipBinary, boolean skipHidden)` A convenience method that matches file names against globs, and can optionally list the directory recursively.
    `java.lang.String[]` | `_listDirectory(java.lang.Object session, java.lang.String directory, VFSFileFilter filter, boolean recursive, java.awt.Component comp, boolean skipBinary, boolean skipHidden)` A convenience method that filters the directory listing according to a filter, and can optionally list the directory recursively.
    `VFSFile[]` | `_listFiles(java.lang.Object session, java.lang.String directory, java.awt.Component comp)` Lists the specified directory.
    `boolean` | `_mkdir(java.lang.Object session, java.lang.String directory, java.awt.Component comp)` Creates a new directory with the specified URL.
    `boolean` | `_rename(java.lang.Object session, java.lang.String from, java.lang.String to, java.awt.Component comp)` Renames the specified URL.
    `void` | `_saveComplete(java.lang.Object session, Buffer buffer, java.lang.String path, java.awt.Component comp)` Called after a file has been saved.
    `java.lang.String` | `constructPath(java.lang.String parent, java.lang.String path)` Constructs a path from the specified directory and file name component.
    `static boolean` | `copy(ProgressObserver progress, java.lang.String sourcePath, java.lang.String targetPath, java.awt.Component comp, boolean canStop)` Copy a file to another using VFS.
    `static boolean` | `copy(ProgressObserver progress, java.lang.String sourcePath, java.lang.String targetPath, java.awt.Component comp, boolean canStop, boolean sendVFSUpdate)` Copy a file to another using VFS.
    `static boolean` | `copy(ProgressObserver progress, VFS sourceVFS, java.lang.Object sourceSession, java.lang.String sourcePath, VFS targetVFS, java.lang.Object targetSession, java.lang.String targetPath, java.awt.Component comp, boolean canStop)` Copy a file to another using VFS.
    `static boolean` | `copy(ProgressObserver progress, VFS sourceVFS, java.lang.Object sourceSession, java.lang.String sourcePath, VFS targetVFS, java.lang.Object targetSession, java.lang.String targetPath, java.awt.Component comp, boolean canStop, boolean sendVFSUpdate)` Copy a file to another using VFS.
    `java.lang.Object` | `createVFSSession(java.lang.String path, java.awt.Component comp)` Creates a VFS session.
    `java.lang.Object` | `createVFSSessionSafe(java.lang.String path, java.awt.Component comp)` Same as `createVFSSession(java.lang.String, java.awt.Component)`, but may be called from any thread.
    `int` | `getCapabilities()` Returns the capabilities of this VFS.
    `static java.awt.Color` | `getDefaultColorFor(java.lang.String name)` Returns color of the specified file name, by matching it against user-specified regular expressions.
    `java.lang.String[]` | `getExtendedAttributes()` Returns the extended attributes supported by this VFS.
    `java.lang.String` | `getFileName(java.lang.String path)` Returns the file name component of the specified path.
    `java.lang.String` | `getFilePath(java.lang.String vfsPath)` Returns the path component of the specified VFS path.
    `char` | `getFileSeparator()` Returns the file separator used by this VFS.
    `java.lang.String` | `getName()` Returns this VFS's name.
    `java.lang.String` | `getParentOfPath(java.lang.String path)` Returns the parent of the specified path.
    `java.lang.String` | `getTwoStageSaveName(java.lang.String path)` Returns a temporary file name based on the given path.
    `boolean` | `insert(View view, Buffer buffer, java.lang.String path)` Inserts a file into the specified buffer.
    `boolean` | `isMarkersFileSupported()` Returns if an additional markers file can be saved by this VFS.
    `boolean` | `load(View view, Buffer buffer, java.lang.String path)` Loads the specified buffer.
    `void` | `reloadDirectory(java.lang.String path)` Called before a directory is reloaded by the file system browser.
    `boolean` | `save(View view, Buffer buffer, java.lang.String path)` Saves the specifies buffer.

    - ### Methods inherited from class java.lang.Object

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

- - ### Field Detail

    - #### READ_CAP

          public static final int READ_CAP

      Read capability.
      Since:
        jEdit 2.6pre2
      See Also:
        Constant Field Values

    - #### WRITE_CAP

          public static final int WRITE_CAP

      Write capability.
      Since:
        jEdit 2.6pre2
      See Also:
        Constant Field Values

    - #### BROWSE_CAP

          public static final int BROWSE_CAP

      Browse capability
      Since:
        jEdit 4.3pre11 This was the official API for adding items to a file system browser's Plugins menu in jEdit 4.1 and earlier. In jEdit 4.2, there is a different way of doing this, you must provide a `browser.actions.xml` file in your plugin JAR, and define `plugin.class.browser-menu-item` or `plugin.class.browser-menu` properties. See `EditPlugin` for details.
      See Also:
        Constant Field Values

    - #### DELETE_CAP

          public static final int DELETE_CAP

      Delete file capability.
      Since:
        jEdit 2.6pre2
      See Also:
        Constant Field Values

    - #### RENAME_CAP

          public static final int RENAME_CAP

      Rename file capability.
      Since:
        jEdit 2.6pre2
      See Also:
        Constant Field Values

    - #### MKDIR_CAP

          public static final int MKDIR_CAP

      Make directory capability.
      Since:
        jEdit 2.6pre2
      See Also:
        Constant Field Values

    - #### LOW_LATENCY_CAP

          public static final int LOW_LATENCY_CAP

      Low latency capability. If this is not set, then a confirm dialog will be shown before doing a directory search in this VFS.
      Since:
        jEdit 4.1pre1
      See Also:
        Constant Field Values

    - #### CASE_INSENSITIVE_CAP

          public static final int CASE_INSENSITIVE_CAP

      Case insensitive file system capability.
      Since:
        jEdit 4.1pre1
      See Also:
        Constant Field Values

    - #### NON_AWT_SESSION_CAP

          public static final int NON_AWT_SESSION_CAP

      Sessions created outside Event Dispatching Thread - file system capability. Set for the file system that does not require that `createVFSSession` is called on edt. All systems that do not implement `createVFSSession` should set it, but others may too.
      Since:
        jEdit 5.0pre1
      See Also:
        Constant Field Values

    - #### EA_TYPE

          public static final java.lang.String EA_TYPE

      File type.
      Since:
        jEdit 4.2pre1
      See Also:
        Constant Field Values

    - #### EA_STATUS

          public static final java.lang.String EA_STATUS

      File status (read only, read write, etc).
      Since:
        jEdit 4.2pre1
      See Also:
        Constant Field Values

    - #### EA_SIZE

          public static final java.lang.String EA_SIZE

      File size.
      Since:
        jEdit 4.2pre1
      See Also:
        Constant Field Values

    - #### EA_MODIFIED

          public static final java.lang.String EA_MODIFIED

      File last modified date.
      Since:
        jEdit 4.2pre1
      See Also:
        Constant Field Values

    - #### IOBUFSIZE

          public static int IOBUFSIZE

  - ### Constructor Detail

    - #### VFS

          protected VFS(java.lang.String name,
             int caps)

      Creates a new virtual filesystem.
      Parameters:
        `name` - The name
        `caps` - The capabilities

    - #### VFS

          protected VFS(java.lang.String name,
             int caps,
             java.lang.String[] extAttrs)

      Creates a new virtual filesystem.
      Parameters:
        `name` - The name
        `caps` - The capabilities
        `extAttrs` - The extended attributes
      Since:
        jEdit 4.2pre1

  - ### Method Detail

    - #### getName

          public java.lang.String getName()

      Returns this VFS's name. The name is used to obtain the label stored in the `vfs.name.label` property.

    - #### getCapabilities

          public int getCapabilities()

      Returns the capabilities of this VFS.
      Since:
        jEdit 2.6pre2

    - #### isMarkersFileSupported

          public boolean isMarkersFileSupported()

      Returns if an additional markers file can be saved by this VFS. Default is `true`.
      Since:
        jEdit 4.3pre10

    - #### getExtendedAttributes

          public java.lang.String[] getExtendedAttributes()

      Returns the extended attributes supported by this VFS.
      Since:
        jEdit 4.2pre1

    - #### getFileName

          public java.lang.String getFileName(java.lang.String path)

      Returns the file name component of the specified path.
      Parameters:
        `path` - The path
      Since:
        jEdit 3.1pre4

    - #### getFilePath

          public java.lang.String getFilePath(java.lang.String vfsPath)

      Returns the path component of the specified VFS path. The standard implementation cuts off the protocol and the protocol separator character and then delegates to eventually present sub-VFS-paths present in the VFS path like "jode:archive:/test.zip!/test.txt".

      If a VFS implementation can have additional information in the VFS path like username / password / host / port for FTP VFS or archive filename for archive VFS, this method should be overridden to remove those information also. The easiest would be to remove those additional information and then delegate to `super.getFilePath()`.
      Parameters:
        `vfsPath` - The VFS path
      Since:
        jEdit 4.5pre1

    - #### getParentOfPath

          public java.lang.String getParentOfPath(java.lang.String path)

      Returns the parent of the specified path. This must be overridden to return a non-null value for browsing of this filesystem to work.
      Parameters:
        `path` - The path
      Since:
        jEdit 2.6pre5

    - #### constructPath

          public java.lang.String constructPath(java.lang.String parent,
                                       java.lang.String path)

      Constructs a path from the specified directory and file name component. This must be overridden to return a non-null value, otherwise browsing this filesystem will not work.

      Unless you are writing a VFS, this method should not be called directly. To ensure correct behavior, you must call `MiscUtilities.constructPath(String,String)` instead.

      Parameters:
        `parent` - The parent directory
        `path` - The path
      Since:
        jEdit 2.6pre2

    - #### getFileSeparator

          public char getFileSeparator()

      Returns the file separator used by this VFS.
      Since:
        jEdit 2.6pre9

    - #### getTwoStageSaveName

          public java.lang.String getTwoStageSaveName(java.lang.String path)

      Returns a temporary file name based on the given path. By default jEdit first saves a file to `#name#save#` and then renames it to the original file. However some virtual file systems might not support the `#` character in filenames, so this method permits the VFS to override this behavior. If this method returns `null`, two stage save will not be used for that particular file (introduced in jEdit 4.3pre1).
      Parameters:
        `path` - The path name
      Since:
        jEdit 4.1pre7

    - #### reloadDirectory

          public void reloadDirectory(java.lang.String path)

      Called before a directory is reloaded by the file system browser. Can be used to flush a cache, etc.
      Since:
        jEdit 4.0pre3

    - #### createVFSSession

          public java.lang.Object createVFSSession(java.lang.String path,
                                          java.awt.Component comp)

      Creates a VFS session. This method is called from the AWT thread, so it should not do any I/O. It could, however, prompt for a login name and password, for example. A simpler filesystem may set the `NON_AWT_SESSION_CAP` capability. When set, sessions may be obtained from any thread.
      Parameters:
        `path` - The path in question
        `comp` - The component that will parent any dialog boxes shown
      Returns:
        The session. The session can be null if there were errors
      Since:
        jEdit 2.6pre3

    - #### createVFSSessionSafe

          public java.lang.Object createVFSSessionSafe(java.lang.String path,
                                              java.awt.Component comp)

      Same as `createVFSSession(java.lang.String, java.awt.Component)`, but may be called from any thread. It first checks the `NON_AWT_SESSION_CAP` capability and enters EDT thread if necessary.

    - #### load

          public boolean load(View view,
                     Buffer buffer,
                     java.lang.String path)

      Loads the specified buffer. The default implementation posts an I/O request to the I/O thread.
      Parameters:
        `view` - The view
        `buffer` - The buffer
        `path` - The path

    - #### save

          public boolean save(View view,
                     Buffer buffer,
                     java.lang.String path)

      Saves the specifies buffer. The default implementation posts an I/O request to the I/O thread.
      Parameters:
        `view` - The view
        `buffer` - The buffer
        `path` - The path

    - #### copy

          public static boolean copy(ProgressObserver progress,
                     VFS sourceVFS,
                     java.lang.Object sourceSession,
                     java.lang.String sourcePath,
                     VFS targetVFS,
                     java.lang.Object targetSession,
                     java.lang.String targetPath,
                     java.awt.Component comp,
                     boolean canStop)
                              throws java.io.IOException

      Copy a file to another using VFS.
      Parameters:
        `progress` - the progress observer. It could be null if you don't want to monitor progress. If not null you should probably launch this command in a WorkThread
        `sourceVFS` - the source VFS
        `sourceSession` - the VFS session
        `sourcePath` - the source path. It must be a file and must exists
        `targetVFS` - the target VFS
        `targetSession` - the target session
        `targetPath` - the target path. If it is a path, it must exists, if it is a file, the parent must exists
        `comp` - The component that will parent error dialog boxes
        `canStop` - could this copy be stopped ?
      Returns:
        true if the copy was successful
      Throws:
        `java.io.IOException` - IOException If an I/O error occurs
      Since:
        jEdit 4.3pre3

    - #### copy

          public static boolean copy(ProgressObserver progress,
                     VFS sourceVFS,
                     java.lang.Object sourceSession,
                     java.lang.String sourcePath,
                     VFS targetVFS,
                     java.lang.Object targetSession,
                     java.lang.String targetPath,
                     java.awt.Component comp,
                     boolean canStop,
                     boolean sendVFSUpdate)
                              throws java.io.IOException

      Copy a file to another using VFS.
      Parameters:
        `progress` - the progress observer. It could be null if you don't want to monitor progress. If not null you should probably launch this command in a WorkThread
        `sourceVFS` - the source VFS
        `sourceSession` - the VFS session
        `sourcePath` - the source path. It must be a file and must exists
        `targetVFS` - the target VFS
        `targetSession` - the target session
        `targetPath` - the target path. If it is a path, it must exists, if it is a file, the parent must exists
        `comp` - The component that will parent error dialog boxes
        `canStop` - could this copy be stopped ?
        `sendVFSUpdate` - true if you want to send a VFS update after the copy. False otherwise (if you do a lot of copy)
      Returns:
        true if the copy was successful
      Throws:
        `java.io.IOException` - IOException If an I/O error occurs
      Since:
        jEdit 5.0

    - #### copy

          public static boolean copy(ProgressObserver progress,
                     java.lang.String sourcePath,
                     java.lang.String targetPath,
                     java.awt.Component comp,
                     boolean canStop,
                     boolean sendVFSUpdate)
                              throws java.io.IOException

      Copy a file to another using VFS.
      Parameters:
        `progress` - the progress observer. It could be null if you don't want to monitor progress. If not null you should probably launch this command in a WorkThread
        `sourcePath` - the source path
        `targetPath` - the target path
        `comp` - The component that will parent error dialog boxes
        `canStop` - if true the copy can be stopped
        `sendVFSUpdate` - true if you want to send a VFS update after the copy. False otherwise (if you do a lot of copy)
      Returns:
        true if the copy was successful
      Throws:
        `java.io.IOException` - IOException If an I/O error occurs
      Since:
        jEdit 5.0

    - #### copy

          public static boolean copy(ProgressObserver progress,
                     java.lang.String sourcePath,
                     java.lang.String targetPath,
                     java.awt.Component comp,
                     boolean canStop)
                              throws java.io.IOException

      Copy a file to another using VFS.
      Parameters:
        `progress` - the progress observer. It could be null if you don't want to monitor progress. If not null you should probably launch this command in a WorkThread
        `sourcePath` - the source path
        `targetPath` - the target path
        `comp` - The component that will parent error dialog boxes
        `canStop` - if true the copy can be stopped
      Returns:
        true if the copy was successful
      Throws:
        `java.io.IOException` - IOException If an I/O error occurs
      Since:
        jEdit 4.3pre3

    - #### insert

          public boolean insert(View view,
                       Buffer buffer,
                       java.lang.String path)

      Inserts a file into the specified buffer. The default implementation posts an I/O request to the I/O thread.
      Parameters:
        `view` - The view
        `buffer` - The buffer
        `path` - The path

    - #### _canonPath

          public java.lang.String _canonPath(java.lang.Object session,
                                    java.lang.String path,
                                    java.awt.Component comp)
                                      throws java.io.IOException

      Returns the canonical form of the specified path name. For example, `~` might be expanded to the user's home directory.
      Parameters:
        `session` - The session
        `path` - The path
        `comp` - The component that will parent error dialog boxes
      Throws:
        `java.io.IOException` - if an I/O error occurred
      Since:
        jEdit 4.0pre2

    - #### _listDirectory

          public java.lang.String[] _listDirectory(java.lang.Object session,
                                          java.lang.String directory,
                                          java.lang.String glob,
                                          boolean recursive,
                                          java.awt.Component comp)
                                            throws java.io.IOException

      A convenience method that matches file names against globs, and can optionally list the directory recursively.
      Parameters:
        `session` - The session
        `directory` - The directory. Note that this must be a full URL, including the host name, path name, and so on. The username and password (if needed by the VFS) is obtained from the session instance.
        `glob` - Only file names matching this glob will be returned
        `recursive` - If true, subdirectories will also be listed.
        `comp` - The component that will parent error dialog boxes
      Throws:
        `java.io.IOException` - if an I/O error occurred
      Since:
        jEdit 4.1pre1

    - #### _listDirectory

          public java.lang.String[] _listDirectory(java.lang.Object session,
                                          java.lang.String directory,
                                          java.lang.String glob,
                                          boolean recursive,
                                          java.awt.Component comp,
                                          boolean skipBinary,
                                          boolean skipHidden)
                                            throws java.io.IOException

      A convenience method that matches file names against globs, and can optionally list the directory recursively.
      Parameters:
        `session` - The session
        `directory` - The directory. Note that this must be a full URL, including the host name, path name, and so on. The username and password (if needed by the VFS) is obtained from the session instance.
        `glob` - Only file names matching this glob will be returned
        `recursive` - If true, subdirectories will also be listed.
        `comp` - The component that will parent error dialog boxes
        `skipBinary` - ignore binary files (do not return them). This will slow down the process since it will open the files
        `skipHidden` - skips hidden files, directories, and backup files. Ignores any file beginning with . or #, or ending with ~ or .bak
      Throws:
        `java.io.IOException` - if an I/O error occurred
      Since:
        jEdit 4.3pre5

    - #### _listDirectory

          public java.lang.String[] _listDirectory(java.lang.Object session,
                                          java.lang.String directory,
                                          VFSFileFilter filter,
                                          boolean recursive,
                                          java.awt.Component comp,
                                          boolean skipBinary,
                                          boolean skipHidden)
                                            throws java.io.IOException

      A convenience method that filters the directory listing according to a filter, and can optionally list the directory recursively.
      Parameters:
        `session` - The session
        `directory` - The directory. Note that this must be a full URL, including the host name, path name, and so on. The username and password (if needed by the VFS) is obtained from the session instance.
        `filter` - The `VFSFileFilter` to use for filtering.
        `recursive` - If true, subdirectories will also be listed.
        `comp` - The component that will parent error dialog boxes
        `skipBinary` - ignore binary files (do not return them). This will slow down the process since it will open the files
        `skipHidden` - skips hidden files, directories, and backup files. Ignores any file beginning with . or #, or ending with ~ or .bak
      Throws:
        `java.io.IOException` - if an I/O error occurred
      Since:
        jEdit 4.3pre7

    - #### _listFiles

          public VFSFile[] _listFiles(java.lang.Object session,
                             java.lang.String directory,
                             java.awt.Component comp)
                               throws java.io.IOException

      Lists the specified directory.
      Parameters:
        `session` - The session
        `directory` - The directory. Note that this must be a full URL, including the host name, path name, and so on. The username and password (if needed by the VFS) is obtained from the session instance.
        `comp` - The component that will parent error dialog boxes
      Throws:
        `java.io.IOException` - if an I/O error occurred
      Since:
        jEdit 4.3pre2

    - #### _getFile

          public VFSFile _getFile(java.lang.Object session,
                         java.lang.String path,
                         java.awt.Component comp)
                           throws java.io.IOException

      Returns the specified directory entry.
      Parameters:
        `session` - The session get it with `createVFSSession(String, Component)`
        `path` - The path
        `comp` - The component that will parent error dialog boxes
      Returns:
        The specified directory entry, or null if it doesn't exist.
      Throws:
        `java.io.IOException` - if an I/O error occurred
      Since:
        jEdit 4.3pre2

    - #### _delete

          public boolean _delete(java.lang.Object session,
                        java.lang.String path,
                        java.awt.Component comp)
                          throws java.io.IOException

      Deletes the specified URL.
      Parameters:
        `session` - The VFS session
        `path` - The path
        `comp` - The component that will parent error dialog boxes
      Throws:
        `java.io.IOException` - if an I/O error occurs
      Since:
        jEdit 2.7pre1

    - #### _rename

          public boolean _rename(java.lang.Object session,
                        java.lang.String from,
                        java.lang.String to,
                        java.awt.Component comp)
                          throws java.io.IOException

      Renames the specified URL. Some filesystems might support moving URLs between directories, however others may not. Do not rely on this behavior.
      Parameters:
        `session` - The VFS session
        `from` - The old path
        `to` - The new path
        `comp` - The component that will parent error dialog boxes
      Throws:
        `java.io.IOException` - if an I/O error occurs
      Since:
        jEdit 2.7pre1

    - #### _mkdir

          public boolean _mkdir(java.lang.Object session,
                       java.lang.String directory,
                       java.awt.Component comp)
                         throws java.io.IOException

      Creates a new directory with the specified URL.
      Parameters:
        `session` - The VFS session
        `directory` - The directory
        `comp` - The component that will parent error dialog boxes
      Throws:
        `java.io.IOException` - if an I/O error occurs
      Since:
        jEdit 2.7pre1

    - #### _backup

          public void _backup(java.lang.Object session,
                     java.lang.String path,
                     java.awt.Component comp)
                       throws java.io.IOException

      Backs up the specified file. Default implementation in 5.0pre1 copies the file to the backup directory. Before 5.0pre1 it was empty.
      Parameters:
        `session` - The VFS session
        `path` - The path
        `comp` - The component that will parent error dialog boxes
      Throws:
        `java.io.IOException` - if an I/O error occurs
      Since:
        jEdit 3.2pre2

    - #### _createInputStream

          public java.io.InputStream _createInputStream(java.lang.Object session,
                                               java.lang.String path,
                                               boolean ignoreErrors,
                                               java.awt.Component comp)
                                                 throws java.io.IOException

      Creates an input stream. This method is called from the I/O thread.
      Parameters:
        `session` - the VFS session
        `path` - The path
        `ignoreErrors` - If true, file not found errors should be ignored
        `comp` - The component that will parent error dialog boxes
      Returns:
        an inputstream or `null` if there was a problem
      Throws:
        `java.io.IOException` - If an I/O error occurs
      Since:
        jEdit 2.7pre1

    - #### _createOutputStream

          public java.io.OutputStream _createOutputStream(java.lang.Object session,
                                                 java.lang.String path,
                                                 java.awt.Component comp)
                                                   throws java.io.IOException

      Creates an output stream. This method is called from the I/O thread.
      Parameters:
        `session` - the VFS session
        `path` - The path
        `comp` - The component that will parent error dialog boxes
      Throws:
        `java.io.IOException` - If an I/O error occurs
      Since:
        jEdit 2.7pre1

    - #### _saveComplete

          public void _saveComplete(java.lang.Object session,
                           Buffer buffer,
                           java.lang.String path,
                           java.awt.Component comp)
                             throws java.io.IOException

      Called after a file has been saved.
      Parameters:
        `session` - The VFS session
        `buffer` - The buffer
        `path` - The path the buffer was saved to (can be different from `Buffer.getPath()` if the user invoked the Save a Copy As command, for example).
        `comp` - The component that will parent error dialog boxes
      Throws:
        `java.io.IOException` - If an I/O error occurs
      Since:
        jEdit 4.1pre9

    - #### _finishTwoStageSave

          public void _finishTwoStageSave(java.lang.Object session,
                                 Buffer buffer,
                                 java.lang.String path,
                                 java.awt.Component comp)
                                   throws java.io.IOException

      Called after a file has been saved and we use twoStageSave (first saving to another file). This should re-apply permissions for example.
      Parameters:
        `session` - The VFS session
        `buffer` - The buffer
        `path` - The path the buffer was saved to (can be different from `Buffer.getPath()` if the user invoked the Save a Copy As command, for example).
        `comp` - The component that will parent error dialog boxes
      Throws:
        `java.io.IOException` - If an I/O error occurs
      Since:
        jEdit 4.3pre4

    - #### _endVFSSession

          public void _endVFSSession(java.lang.Object session,
                            java.awt.Component comp)
                              throws java.io.IOException

      Finishes the specified VFS session. This must be called after all I/O with this VFS is complete, to avoid leaving stale network connections and such.
      Parameters:
        `session` - The VFS session
        `comp` - The component that will parent error dialog boxes
      Throws:
        `java.io.IOException` - if an I/O error occurred
      Since:
        jEdit 2.7pre1

    - #### getDefaultColorFor

          public static java.awt.Color getDefaultColorFor(java.lang.String name)

      Returns color of the specified file name, by matching it against user-specified regular expressions.
      Since:
        jEdit 4.0pre1