FsController (TrueZIP Kernel 7.4.1 API)

java.lang.Object
- de.schlichtherle.truezip.fs.FsController<M>

Type Parameters:
M - The type of the file system model.

Direct Known Subclasses:

FsModelController
```
@DefaultAnnotation(value=edu.umd.cs.findbugs.annotations.NonNull.class)
public abstract class FsController<M extends FsModel>
extends Object
```
An abstract class which provides read/write access to a file system. This class may be organized in a chain of responsibility for file system federation. The mount point of the file system model addresses the file system at the head of this chain of federated file systems.
Where the methods of this abstract class accept a file system entry name as a parameter, this will get resolved against the mount point URI of this controller's file system model.
All implementations must be reentrant on exceptions - so clients may repeatedly call their methods. Whether an implementation must be thread-safe or not depends on the context, i.e. its factory. E.g. the FsManager.getController(de.schlichtherle.truezip.fs.FsMountPoint, de.schlichtherle.truezip.fs.FsCompositeDriver) method requires all returned file system controllers to be thread-safe.

Author:

Christian Schlichtherle

See Also:
FsManager

Constructor Summary

Constructors
Constructor and Description

FsController()

Constructors
Constructor and Description
`FsController()`

Method Summary

Methods
Modifier and Type	Method and Description
`boolean`	`equals(Object that)` Two file system controllers are considered equal if and only if they are identical.
`abstract Icon`	`getClosedIcon()`
`abstract FsEntry`	`getEntry(FsEntryName name)` Returns a file system entry or `null` if no file system entry exists for the given name.
`abstract InputSocket<?>`	`getInputSocket(FsEntryName name, BitField<FsInputOption> options)` Returns an input socket for reading the contents of the file system entry addressed by the given name from the file system.
`abstract M`	`getModel()` Returns the file system model.
`abstract Icon`	`getOpenIcon()`
`abstract OutputSocket<?>`	`getOutputSocket(FsEntryName name, BitField<FsOutputOption> options, Entry template)` Returns an output socket for writing the contents of the entry addressed by the given name to the file system.
`abstract FsController<?>`	`getParent()` Returns the controller for the parent file system or `null` if and only if this file system is not federated, i.e. not a member of another file system.
`int`	`hashCode()` Returns a hash code which is consistent with `equals(java.lang.Object)`.
`boolean`	`isExecutable(FsEntryName name)` Returns `false` if the named file system entry is not executable.
`abstract boolean`	`isReadable(FsEntryName name)` Returns `false` if the named file system entry is not readable.
`abstract boolean`	`isReadOnly()` Returns `true` if and only if the file system is read-only.
`abstract boolean`	`isWritable(FsEntryName name)` Returns `false` if the named file system entry is not writable.
`abstract void`	`mknod(FsEntryName name, Entry.Type type, BitField<FsOutputOption> options, Entry template)` Creates or replaces and finally links a chain of one or more entries for the given entry `name` into the file system.
`abstract void`	`setReadOnly(FsEntryName name)`
`abstract boolean`	`setTime(FsEntryName name, BitField<Entry.Access> types, long value, BitField<FsOutputOption> options)` Makes an attempt to set the last access time of all types in the given bit field for the file system entry with the given name.
`boolean`	`setTime(FsEntryName name, Map<Entry.Access,Long> times, BitField<FsOutputOption> options)` Makes an attempt to set the last access time of all types in the given map for the file system entry with the given name.
`void`	`sync(BitField<FsSyncOption> options)` Commits all unsynchronized changes to the contents of this file system to its parent file system, releases the associated resources (e.g. target archive files) for access by third parties (e.g. other processes), cleans up any temporary allocated resources (e.g. temporary files) and purges any cached data.
`abstract <X extends IOException> void`	`sync(BitField<FsSyncOption> options, ExceptionHandler<? super FsSyncException,X> handler)` Commits all unsynchronized changes to the contents of this file system to its parent file system, releases the associated resources (e.g. target archive files) for access by third parties (e.g. other processes), cleans up any temporary allocated resources (e.g. temporary files) and purges any cached data.
`String`	`toString()` Returns a string representation of this object for debugging and logging purposes.
`abstract void`	`unlink(FsEntryName name, BitField<FsOutputOption> options)` Removes the named file system entry from the file system.

Methods inherited from class java.lang.Object
clone, finalize, getClass, notify, notifyAll, wait, wait, wait

- Constructor Detail
  - FsController
```
public FsController()
```
- Method Detail
  - equals
```
public final boolean equals(@CheckForNull
             Object that)
```
    Two file system controllers are considered equal if and only if they are identical. This can't get overriden.
    
    Overrides:
    
    equals in class Object
    
    Parameters:
    that - the object to compare.
  - getClosedIcon
```
@Nullable
public abstract Icon getClosedIcon()
                            throws IOException
```
    Throws:
    
    IOException
  - getEntry
```
@Nullable
public abstract FsEntry getEntry(FsEntryName name)
                          throws IOException
```
    Returns a file system entry or null if no file system entry exists for the given name. Modifying the returned object is either not supported (i.e. throws an UnsupportedOperationException) or does not show any effect on the file system.
    
    Parameters:
    name - the name of the file system entry.
    
    Returns:
    A file system entry or null if no file system entry exists for the given name.
    
    Throws:
    
    IOException - on any I/O error.
  - getInputSocket
```
public abstract InputSocket<?> getInputSocket(FsEntryName name,
                            BitField<FsInputOption> options)
```
    Returns an input socket for reading the contents of the file system entry addressed by the given name from the file system.
    
    Parameters:
    name - the file system entry name.
    options - the input options.
    
    Returns:
    An InputSocket.
  - getModel
```
public abstract M getModel()
```
    Returns the file system model. Multiple invocations must return the same object.
    
    Returns:
    The file system model.
  - getOpenIcon
```
@Nullable
public abstract Icon getOpenIcon()
                          throws IOException
```
    Throws:
    
    IOException
  - getOutputSocket
```
public abstract OutputSocket<?> getOutputSocket(FsEntryName name,
                              BitField<FsOutputOption> options,
                              @CheckForNull
                              Entry template)
```
    Returns an output socket for writing the contents of the entry addressed by the given name to the file system. If template is not null, then the output entry shall have as many of its properties copied as reasonable, e.g. the last modification time.
    
    Parameters:
    name - a file system entry name.
    options - a bit field of output options.
    template - a nullable template for the properties of the output entry.
    
    Returns:
    An OutputSocket.
  - getParent
```
@Nullable
public abstract FsController<?> getParent()
```
    Returns the controller for the parent file system or null if and only if this file system is not federated, i.e. not a member of another file system. Multiple invocations must return the same object.
    
    Returns:
    The nullable controller for the parent file system.
  - hashCode
```
public final int hashCode()
```
    Returns a hash code which is consistent with equals(java.lang.Object). This can't get overriden.
    
    Overrides:
    
    hashCode in class Object
  - isExecutable
```
public boolean isExecutable(FsEntryName name)
                     throws IOException
```
    Returns false if the named file system entry is not executable.
    The implementation in the class FsController always returns false.
    
    Parameters:
    name - the name of the file system entry.
    
    Returns:
    false if the named file system entry is not executable.
    
    Throws:
    
    IOException - On any I/O error.
    Since:
    
    TrueZIP 7.2.
  - isReadable
```
public abstract boolean isReadable(FsEntryName name)
                            throws IOException
```
    Returns false if the named file system entry is not readable.
    
    Parameters:
    name - the name of the file system entry.
    
    Returns:
    false if the named file system entry is not readable.
    
    Throws:
    
    IOException - On any I/O error.
  - isReadOnly
```
public abstract boolean isReadOnly()
                            throws IOException
```
    Returns true if and only if the file system is read-only.
    
    Returns:
    true if and only if the file system is read-only.
    
    Throws:
    
    IOException - on any I/O error.
  - isWritable
```
public abstract boolean isWritable(FsEntryName name)
                            throws IOException
```
    Returns false if the named file system entry is not writable.
    
    Parameters:
    name - the name of the file system entry.
    
    Returns:
    false if the named file system entry is not writable.
    
    Throws:
    
    IOException - On any I/O error.
  - mknod
```
public abstract void mknod(FsEntryName name,
         Entry.Type type,
         BitField<FsOutputOption> options,
         @CheckForNull
         Entry template)
                    throws IOException
```
    Creates or replaces and finally links a chain of one or more entries for the given entry name into the file system.
    Parameters:
    name - the file system entry name.
    type - the file system entry type.
    options - the file system output options. If FsOutputOption.CREATE_PARENTS is set, any missing parent directories will be created and linked into the file system with its last modification time set to the system's current time.
    template - if not null, then the file system entry at the end of the chain shall inherit as much properties from this entry as possible - with the exception of its name and type.
    
    Throws:
    IOException - on any I/O error, including but not limited to these reasons:
    
    The file system is read only.
    name contains characters which are not supported by the file system.
    The entry already exists and either the option FsOutputOption.EXCLUSIVE is set or the entry is a directory.
    The entry exists as a different type.
    A parent entry exists but is not a directory.
    A parent entry is missing and createParents is false.
  - setReadOnly
```
public abstract void setReadOnly(FsEntryName name)
                          throws IOException
```
    Throws:
    
    IOException
  - setTime
```
public abstract boolean setTime(FsEntryName name,
              BitField<Entry.Access> types,
              long value,
              BitField<FsOutputOption> options)
                         throws IOException
```
    Makes an attempt to set the last access time of all types in the given bit field for the file system entry with the given name. If false is returned or an IOException is thrown, then still some of the last access times may have been set. Whether or not this is an atomic operation is specific to the implementation.
    
    Parameters:
    name - the file system entry name.
    types - the access types.
    value - the last access time.
    
    Returns:
    true if and only if setting the access time for all types in types succeeded.
    
    Throws:
    
    IOException - on any I/O error.
  - setTime
```
public boolean setTime(FsEntryName name,
              Map<Entry.Access,Long> times,
              BitField<FsOutputOption> options)
                throws IOException
```
    Makes an attempt to set the last access time of all types in the given map for the file system entry with the given name. If false is returned or an IOException is thrown, then still some of the last access times may have been set. Whether or not this is an atomic operation is specific to the implementation.
    
    Parameters:
    name - the file system entry name.
    times - the access times.
    
    Returns:
    true if and only if setting the access time for all types in times succeeded.
    
    Throws:
    
    IOException - on any I/O error.
    
    NullPointerException - if any key or value in the map is null.
    Since:
    
    TrueZIP 7.2
  - sync
```
public final void sync(BitField<FsSyncOption> options)
                throws FsSyncException
```
    Commits all unsynchronized changes to the contents of this file system to its parent file system, releases the associated resources (e.g. target archive files) for access by third parties (e.g. other processes), cleans up any temporary allocated resources (e.g. temporary files) and purges any cached data. Note that temporary resources may get allocated even if the federated file systems were accessed read-only. If this is not a federated file system, i.e. if its not a member of a parent file system, then nothing happens. Otherwise, the state of this file system controller is reset.
    This method calls sync(options, builder), where builder is an instance of FsSyncExceptionBuilder. If the call succeeds, the builder's AbstractExceptionBuilder.check() method is called to check out any FsSyncWarningException, too.
    
    Parameters:
    options - the synchronization options.
    
    Throws:
    
    FsSyncException - if committing the changes fails for any reason.
    
    IllegalArgumentException - if the combination of synchronization options is illegal, e.g. if FORCE_CLOSE_INPUT is cleared and FORCE_CLOSE_OUTPUT is set.
  - sync
```
public abstract <X extends IOException> void sync(BitField<FsSyncOption> options,
                                ExceptionHandler<? super FsSyncException,X> handler)
                   throws X extends IOException
```
    Commits all unsynchronized changes to the contents of this file system to its parent file system, releases the associated resources (e.g. target archive files) for access by third parties (e.g. other processes), cleans up any temporary allocated resources (e.g. temporary files) and purges any cached data. Note that temporary resources may get allocated even if the federated file systems were accessed read-only. If this is not a federated file system, i.e. if its not a member of a parent file system, then nothing happens. Otherwise, the state of this file system controller is reset.
    
    Type Parameters:
    X - The type of the IOException to throw at the discretion of the exception handler.
    Parameters:
    options - a bit field of synchronization options.
    handler - the exception handling strategy for consuming input FsSyncExceptions and/or assembling output IOExceptions.
    
    Throws:
    
    IOException - at the discretion of the exception handler upon the occurence of an FsSyncException.
    
    IllegalArgumentException - if the combination of synchronization options is illegal, e.g. if FsSyncOption.FORCE_CLOSE_INPUT is cleared and FsSyncOption.FORCE_CLOSE_OUTPUT is set.
  - toString
```
public String toString()
```
    Returns a string representation of this object for debugging and logging purposes.
    
    Overrides:
    
    toString in class Object
  - unlink
```
public abstract void unlink(FsEntryName name,
          BitField<FsOutputOption> options)
                     throws IOException
```
    Removes the named file system entry from the file system. If the named file system entry is a directory, it must be empty.
    
    Parameters:
    name - the file system entry name.
    options - output options for this operation.
    
    Throws:
    
    IOException - On any I/O error.

Class FsController<M extends FsModel>

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Constructor Detail

FsController

Method Detail

equals

getClosedIcon

getEntry

getInputSocket

getModel

getOpenIcon

getOutputSocket

getParent

hashCode

isExecutable

isReadable

isReadOnly

isWritable

mknod

setReadOnly

setTime

setTime

sync

sync

toString

unlink