org.openide.filesystems
Class DefaultAttributes

java.lang.Object
  |
  +--org.openide.filesystems.DefaultAttributes

All Implemented Interfaces:

AbstractFileSystem.Attr, AbstractFileSystem.List, Serializable

public class DefaultAttributes

extends Object

implements AbstractFileSystem.Attr, AbstractFileSystem.List

Implementation of AbstractFileSystem.Attr using a special file in each folder for holding attributes. It needs to hide the file from the rest of system, so it also implements AbstractFileSystem.List to exclude the file from the children list (it can then serve to filter a plain list implementation). Description of format of special file ilustrates best DTD file that is showed in next lines:

See Also:

Serialized Form

Field Summary

static String	ATTR_EXT Deprecated. does not handle XML attributes
static String	ATTR_NAME Deprecated. does not handle XML attributes
static String	ATTR_NAME_EXT Deprecated. does not handle XML attributes

Fields inherited from interface org.openide.filesystems.AbstractFileSystem.Attr

serialVersionUID

Fields inherited from interface org.openide.filesystems.AbstractFileSystem.List

serialVersionUID

Constructor Summary

DefaultAttributes(AbstractFileSystem.Info info, AbstractFileSystem.Change change, AbstractFileSystem.List list)
Constructor.

Method Summary

Enumeration	attributes(String name) Get all file attribute names for the file.
String[]	children(String f) Get the children list, filtering out the special attributes file.
void	deleteAttributes(String name) Called when a file is deleted, to also delete its attributes.
Object	readAttribute(String name, String attrName) Get the file attribute with the specified name.
void	renameAttributes(String oldName, String newName) Called when a file is renamed, to appropriately update its attributes.
void	writeAttribute(String name, String attrName, Object value) Set the file attribute with the specified name.

Methods inherited from class java.lang.Object

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

Field Detail

ATTR_NAME

public static final String ATTR_NAME

Deprecated. does not handle XML attributes

File name of special file in each folder where attributes are saved.

ATTR_EXT

public static final String ATTR_EXT

Deprecated. does not handle XML attributes

Extension of special file in each folder where attributes are saved.

ATTR_NAME_EXT

public static final String ATTR_NAME_EXT

Deprecated. does not handle XML attributes

Name with extension of special file in each folder where attributes are saved.

Constructor Detail

DefaultAttributes

public DefaultAttributes(AbstractFileSystem.Info info,
                         AbstractFileSystem.Change change,
                         AbstractFileSystem.List list)

Constructor.

Parameters:

info - file object information to use

change - file change hooks to use

list - list to filter (can be null, but then this object cannot work as a list)

Method Detail

children

public String[] children(String f)

Get the children list, filtering out the special attributes file. You must have provided a non-null AbstractFileSystem.List in the constructor for this to work. If you did not, the rest of the class will work fine, but this method should not be called and this object should not be used as a List implementation.

Specified by:

children in interface AbstractFileSystem.List

Parameters:

f - the folder, by name; e.g. top/next/afterthat

Returns:

a list of children of the folder, as file.ext (no path)

readAttribute

public Object readAttribute(String name,
                            String attrName)

Description copied from interface: AbstractFileSystem.Attr

Get the file attribute with the specified name.

Specified by:

readAttribute in interface AbstractFileSystem.Attr

Following copied from interface: org.openide.filesystems.AbstractFileSystem.Attr

Parameters:

name - the file

attrName - name of the attribute

Returns:

appropriate (serializable) value or null if the attribute is unset (or could not be properly restored for some reason)

writeAttribute

public void writeAttribute(String name,
                           String attrName,
                           Object value)
                    throws IOException

Description copied from interface: AbstractFileSystem.Attr

Set the file attribute with the specified name.

Specified by:

writeAttribute in interface AbstractFileSystem.Attr

Following copied from interface: org.openide.filesystems.AbstractFileSystem.Attr

Parameters:

name - the file

attrName - name of the attribute

value - new value or null to clear the attribute. Must be serializable, although particular file systems may or may not use serialization to store attribute values.

Throws:

IOException - if the attribute cannot be set. If serialization is used to store it, this may in fact be a subclass such as NotSerializableException.

attributes

public Enumeration attributes(String name)

Description copied from interface: AbstractFileSystem.Attr

Get all file attribute names for the file.

Specified by:

attributes in interface AbstractFileSystem.Attr

Following copied from interface: org.openide.filesystems.AbstractFileSystem.Attr

Parameters:

name - the file

Returns:

enumeration of keys (as strings)

renameAttributes

public void renameAttributes(String oldName,
                             String newName)

Description copied from interface: AbstractFileSystem.Attr

Called when a file is renamed, to appropriately update its attributes.

Specified by:

renameAttributes in interface AbstractFileSystem.Attr

Following copied from interface: org.openide.filesystems.AbstractFileSystem.Attr

Parameters:

oldName - old name of the file

newName - new name of the file

deleteAttributes

public void deleteAttributes(String name)

Description copied from interface: AbstractFileSystem.Attr

Called when a file is deleted, to also delete its attributes.

Specified by:

deleteAttributes in interface AbstractFileSystem.Attr

Following copied from interface: org.openide.filesystems.AbstractFileSystem.Attr

Parameters:

name - name of the file