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InstanceDataObject (NetBeans Loaders API) - NetBeans API Javadoc 5.5.1

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org.openide.loaders
Class InstanceDataObject

java.lang.Object
  org.openide.loaders.DataObject
      org.openide.loaders.MultiDataObject
          org.openide.loaders.InstanceDataObject

All Implemented Interfaces:

Serializable, InstanceCookie, InstanceCookie.Of, Node.Cookie, HelpCtx.Provider

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public class InstanceDataObject
extends MultiDataObject
implements InstanceCookie.Of

A data object whose only purpose is to supply InstanceCookie. The instances are created by default instantiation; the name of the class to instantiate is stored on disk, typically right in the file name.

This data object is generally used to configure menus and toolbars, though it could be used in any situation requiring instances to be present in a folder; for example, anything using FolderInstance.

Typical instance classes are subclasses of SystemAction to make menu items or toolbar buttons; JSeparator for a menu separator; or JToolBar.Separator for a toolbar separator.

Use create(org.openide.loaders.DataFolder, java.lang.String, java.lang.String) and remove(org.openide.loaders.DataFolder, java.lang.String, java.lang.String) to make the objects. Better yet, use an XML filesystem to install them declaratively.

Instance data object by default recognizes all files with .instance suffix. Such file can have associated optional file attributes:

instanceCreate

instantionalized Object (e.g. created by methodvalue at XML filesystem)

instanceOf

String that is tokenized at ':', ',', ';' and whitespace boundaries. Resulting tokens represent class names that created instance is instanceof. Utilizing it may improve performance.

(optional file attributes documented since 3.34).

See Also:

Serialized Form

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Nested Class Summary

 

Nested classes/interfaces inherited from class org.openide.loaders.MultiDataObject
MultiDataObject.Entry

 

Nested classes/interfaces inherited from class org.openide.loaders.DataObject
DataObject.Container, DataObject.Registry

 

Nested classes/interfaces inherited from interface org.openide.cookies.InstanceCookie
InstanceCookie.Of

 

Field Summary
static String	INSTANCE           File extension for instance data objects.

 

Fields inherited from class org.openide.loaders.DataObject
PROP_COOKIE, PROP_FILES, PROP_HELP, PROP_MODIFIED, PROP_NAME, PROP_PRIMARY_FILE, PROP_TEMPLATE, PROP_VALID

 

Constructor Summary
InstanceDataObject(FileObject pf, MultiFileLoader loader)           Create a new instance.

 

Method Summary
static InstanceDataObject	create(DataFolder folder, String name, Class clazz)           Create a new InstanceDataObject in a given folder.
static InstanceDataObject	create(DataFolder folder, String name, Object instance, ModuleInfo info)           Create a new InstanceDataObject containing settings in a given folder.
static InstanceDataObject	create(DataFolder folder, String name, Object instance, ModuleInfo info, boolean create)           Create a new InstanceDataObject containing settings in a given folder.
static InstanceDataObject	create(DataFolder folder, String name, String className)           Create a new InstanceDataObject in a given folder.
protected  Node	createNodeDelegate()           Provides node that should represent this data object.
protected  void	dispose()           Allows subclasses to discard the object.
static InstanceDataObject	find(DataFolder folder, String name, Class clazz)           Finds instance of specified name in a given folder.
static InstanceDataObject	find(DataFolder folder, String name, String className)           Finds instance of specified name in a given folder.
Node.Cookie	getCookie(Class clazz)           Look for a cookie in the current cookie set matching the requested class.
HelpCtx	getHelpCtx()           Get help context for this object.
String	getName()           Get the name of the data object.
protected  DataObject	handleCopy(DataFolder df)           Copies primary and secondary files to new folder.
protected  DataObject	handleCreateFromTemplate(DataFolder df, String name)           Create a new data object from template (implemented in subclasses).
protected  void	handleDelete()           Delete this object (implemented by subclasses).
protected  FileObject	handleRename(String name)           Rename this object (implemented in subclasses).
Class	instanceClass()
Object	instanceCreate()
String	instanceName()
boolean	instanceOf(Class type)           Query if this instance can create object of given type.
static boolean	remove(DataFolder folder, String name, Class clazz)           Remove an existing instance data object.
static boolean	remove(DataFolder folder, String name, String className)           Remove an existing instance data object.

 

Methods inherited from class org.openide.loaders.MultiDataObject
addSecondaryEntry, files, findSecondaryEntry, getCookieSet, getMultiFileLoader, getPrimaryEntry, handleMove, isCopyAllowed, isDeleteAllowed, isMoveAllowed, isRenameAllowed, registerEntry, removeSecondaryEntry, secondaryEntries, setCookieSet, takePrimaryFileLock

 

Methods inherited from class org.openide.loaders.DataObject

addPropertyChangeListener, addVetoableChangeListener, copy, createFromTemplate, createFromTemplate, createShadow, delete, find, firePropertyChange, fireVetoableChange, getCookie, getFolder, getLoader, getNodeDelegate, getPrimaryFile, getRegistry, handleCreateShadow, isModified, isShadowAllowed, isTemplate, isValid, markFiles, move, removePropertyChangeListener, removeVetoableChangeListener, rename, setModified, setTemplate, setValid, toString, writeReplace

 

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

 

Field Detail

INSTANCE

public static final String INSTANCE

File extension for instance data objects.

See Also:

Constant Field Values

Constructor Detail

InstanceDataObject

public InstanceDataObject(FileObject pf,
                          MultiFileLoader loader)
                   throws DataObjectExistsException

Create a new instance. Do not use this to make instances; use create(org.openide.loaders.DataFolder, java.lang.String, java.lang.String).

Parameters:

pf - primary file object for this data object

loader - the loader

Throws:

DataObjectExistsException - if it already exists

Method Detail

find

public static InstanceDataObject find(DataFolder folder,
                                      String name,
                                      String className)

Finds instance of specified name in a given folder.

Parameters:

folder - the folder to create the instance data object in

name - the name to give to the object (can be null if no special name besides the class name is needed)

className - the name of the class the new object should provide an instance of

Returns:

the found instance data object or null if it does not exist

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find

public static InstanceDataObject find(DataFolder folder,
                                      String name,
                                      Class clazz)

Finds instance of specified name in a given folder.

Parameters:

folder - the folder to create the instance data object in

name - the name to give to the object (can be null if no special name besides the class name is needed)

clazz - the class to create instance for (see class header for details)

Returns:

the found instance data object or null if it does not exist

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create

public static InstanceDataObject create(DataFolder folder,
                                        String name,
                                        String className)
                                 throws IOException

Create a new InstanceDataObject in a given folder. If object with specified name already exists, it is returned. You should specify the name if there is a chance another file of the same instance class already exists in the folder; or just to provide a more descriptive name, which will appear in the Explorer for example.

Note: use of XML layers to install instances is generally preferred.

Parameters:

folder - the folder to create the instance data object in

name - the name to give to the object (can be null if no special name besides the class name is needed) but name cannot be empty

className - the name of the class the new object should provide an instance of (see class header for details)

Returns:

the newly created or existing instance data object

Throws:

IOException - if the file cannot be created

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create

public static InstanceDataObject create(DataFolder folder,
                                        String name,
                                        Class clazz)
                                 throws IOException

Create a new InstanceDataObject in a given folder. If object with specified name already exists, it is returned. You should specify the name if there is a chance another file of the same instance class already exists in the folder; or just to provide a more descriptive name, which will appear in the Explorer for example.

Note: use of XML layers to install instances is generally preferred.

Parameters:

folder - the folder to create the instance data object in

name - the name to give to the object (can be null if no special name besides the class name is needed)

clazz - the class to create instance for (see class header for details)

Returns:

the newly created or existing instance data object

Throws:

IOException - if the file cannot be created

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create

public static InstanceDataObject create(DataFolder folder,
                                        String name,
                                        Object instance,
                                        ModuleInfo info)
                                 throws IOException

Create a new InstanceDataObject containing settings in a given folder. If object with specified name already exists, it is returned. If the module info is null then the origin module info of an instance class is tried to find out.

Note: use of XML layers to install instances is generally preferred.

Parameters:

folder - the folder to create the instance data object in

name - the name to give to the object (can be null if no special name besides the class name is needed) but name cannot be empty

instance - the serializable instance

info - the module info describing the settings provenance (can be null)

Returns:

the newly created or existing instance data object

Throws:

IOException - if the file cannot be created

Since:

1.28

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create

public static InstanceDataObject create(DataFolder folder,
                                        String name,
                                        Object instance,
                                        ModuleInfo info,
                                        boolean create)
                                 throws IOException

Create a new InstanceDataObject containing settings in a given folder. If the module info is null then the origin module info of an instance class is tried to find out.

Note: use of XML layers to install instances is generally preferred.

Parameters:

folder - the folder to create the instance data object in

name - the name to give to the object (can be null if no special name besides the class name is needed) but name cannot be empty

instance - the serializable instance

info - the module info describing the settings provenance (can be null)

create - true - always create new file; false - store to existing file if exist

Returns:

the newly created or existing instance data object

Throws:

IOException - if the file cannot be created

Since:

2.9

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remove

public static boolean remove(DataFolder folder,
                             String name,
                             String className)

Remove an existing instance data object. If you have the exact file name, just call DataObject.delete(); this method lets you delete an instance you do not have an exact record of the file name for, based on the same information used to create it.

Note: use of XML layers to install instances is generally preferred.

Parameters:

folder - the folder to remove the file from

name - the name of the instance (can be null)

className - the name of class the object referred to (see class header for details)

Returns:

true if the instance was succesfully removed, false if not

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remove

public static boolean remove(DataFolder folder,
                             String name,
                             Class clazz)

Remove an existing instance data object. If you have the exact file name, just call DataObject.delete(); this method lets you delete an instance you do not have an exact record of the file name for, based on the same information used to create it.

Note: use of XML layers to install instances is generally preferred.

Parameters:

folder - the folder to remove the file from

name - the name of the instance (can be null)

clazz - the class the object referred to (see class header for details)

Returns:

true if the instance was succesfully removed, false if not

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getHelpCtx

public HelpCtx getHelpCtx()

Description copied from class: DataObject

Get help context for this object.

Specified by:

getHelpCtx in interface HelpCtx.Provider

Overrides:

getHelpCtx in class MultiDataObject

Returns:

the help context

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createNodeDelegate

protected Node createNodeDelegate()

Description copied from class: MultiDataObject

Provides node that should represent this data object.

Overrides:

createNodeDelegate in class MultiDataObject

Returns:

the node representation

See Also:

DataNode

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getCookie

public Node.Cookie getCookie(Class clazz)

Description copied from class: MultiDataObject

Look for a cookie in the current cookie set matching the requested class.

Overrides:

getCookie in class MultiDataObject

Parameters:

clazz - the class to look for

Returns:

an instance of that class, or null if this class of cookie is not supported

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instanceName

public String instanceName()

Specified by:

instanceName in interface InstanceCookie

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instanceClass

public Class instanceClass()
                    throws IOException,
                           ClassNotFoundException

Specified by:

instanceClass in interface InstanceCookie

Throws:

IOException

ClassNotFoundException

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instanceOf

public boolean instanceOf(Class type)

Query if this instance can create object of given type.

Specified by:

instanceOf in interface InstanceCookie.Of

Parameters:

type - the type to create

Returns:

true or false

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instanceCreate

public Object instanceCreate()
                      throws IOException,
                             ClassNotFoundException

Specified by:

instanceCreate in interface InstanceCookie

Throws:

IOException

ClassNotFoundException

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getName

public String getName()

Description copied from class: DataObject

Get the name of the data object.

The default implementation uses the name of the primary file.

Overrides:

getName in class DataObject

Returns:

the name

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handleRename

protected FileObject handleRename(String name)
                           throws IOException

Description copied from class: DataObject

Rename this object (implemented in subclasses).

Overrides:

handleRename in class MultiDataObject

Parameters:

name - name to rename the object to

Returns:

new primary file of the object

Throws:

IOException - if an error occures

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handleCreateFromTemplate

protected DataObject handleCreateFromTemplate(DataFolder df,
                                              String name)
                                       throws IOException

Description copied from class: DataObject

Create a new data object from template (implemented in subclasses). This method should copy the content of the template to the destination folder and assign a new name to the new object.

Overrides:

handleCreateFromTemplate in class MultiDataObject

Parameters:

df - data folder to create object in

name - name to give to the new object (or null if the name should be chosen according to the template)

Returns:

the new data object

Throws:

IOException - if an error occured

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handleCopy

protected DataObject handleCopy(DataFolder df)
                         throws IOException

Description copied from class: MultiDataObject

Copies primary and secondary files to new folder. May ask for user confirmation before overwriting.

Overrides:

handleCopy in class MultiDataObject

Parameters:

df - the new folder

Returns:

data object for the new primary

Throws:

IOException - if there was a problem copying

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dispose

protected void dispose()

Description copied from class: DataObject

Allows subclasses to discard the object. When an object is discarded, it is released from the list of objects registered in the system. Then the contents of the parent folder (if it still exists) are rescanned, which may result in the creation of a new data object for the primary file.

The normal use of this method is to change the type of a data object. Because this would usually only be invoked from the original data object, it is protected.

Overrides:

dispose in class DataObject

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handleDelete

protected void handleDelete()
                     throws IOException

Description copied from class: DataObject

Delete this object (implemented by subclasses).

Overrides:

handleDelete in class MultiDataObject

Throws:

IOException - if an error occures

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