oracle.ide.model
Class ObservableDataFolder
java.lang.Object
|
+--oracle.ide.model.DefaultDisplayable
|
+--oracle.ide.model.DefaultElement
|
+--oracle.ide.model.DefaultFolder
|
+--oracle.ide.model.DataFolder
|
+--oracle.ide.model.ObservableDataFolder
- All Implemented Interfaces:
- Copyable, Data, Dirtyable, Displayable, Element, Folder, Subject
- Direct Known Subclasses:
- Workspaces
- public class ObservableDataFolder
- extends DataFolder
- implements Subject
ObservableDataFolder
is a complete, default implementation
of the Folder
and Subject
interfaces. This is a
convenient starting point for the implementation of data classes
which can be integrated with the IDE framework.
- See Also:
Subject
,
DataFolder
Method Summary |
void |
attach(Observer observer)
Registers an observer interested in being notified when the internal
state of the class implementing the Subject interface
changes. |
java.lang.Object |
copyTo(java.lang.Object object)
Copies the internal state of this object to the
specified copy . |
void |
detach(Observer observer)
Unregisters an observer that is not interested anymore in being notified
when the internal state of the class implementing the Subject
interface changes. |
void |
notifyObservers(java.lang.Object observed,
UpdateMessage change)
Notifies all observers that the state of the subject has changed. |
Methods inherited from class java.lang.Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait |
Methods inherited from interface oracle.ide.model.Data |
getData |
ObservableDataFolder
public ObservableDataFolder()
- Default constructor needed for JavaBean status.
ObservableDataFolder
public ObservableDataFolder(ObservableDataFolder observableDataFolder)
- Copy constructor.
copyTo
public java.lang.Object copyTo(java.lang.Object object)
- Description copied from interface:
Copyable
- Copies the internal state of
this
object to the
specified copy
. If copy
is
null
, then this method should create a new instance
of this
class and proceed to copy the internal state
to the newly created object. Generally, only the persistent
state of the object should be copied, but whether or not it is
appropriate to copy transient properties is at the discretion
of the individual implementor.
Regardless of whether the copy occurs to an existing object or to
a newly created object, the return value is object to which
this
object's state was copied.
There is a standard implementation pattern for the
copyTo
method that helps avoid problems that arise
when a Copyable
object is subclassed. The pattern
is:
public Object copyTo( Object target )
{
final <this_class> copy =
target != null ? (<this_class>) target : new <this_class>();
copyToImpl( copy );
return copy;
}
protected final void copyToImpl( <this_class> copy )
{
super.copyToImpl( copy ); // if necessary
// put code here for copying the properties of <this_class>
}
The parameter passed into the copyToImpl
method is
the same type of this
class. The responsibility of
copyToImpl
is to copy the state of this
class through direct access of the fields. The
copyToImpl
method should not use getters and setters
since these may be overridden, causing the state of
this
class to be incompletely copied.
- Overrides:
copyTo
in class DataFolder
- Following copied from interface:
oracle.ide.util.Copyable
- Parameters:
target
- The target object to which the state of
this
object should be copied. If target
is null
, then the copyTo
method will
return a new instance of this
class.- Returns:
- The object to which the state of
this
object was copied. If the target
was
non-null
, then the return value is the same as the
target
object that was passed in; otherwise, the
return value is a new instance of this
class. - Throws:
java.lang.ClassCastException
- if target
is
non-null
and cannot be downcast to the type of
this
object.
attach
public void attach(Observer observer)
- Description copied from interface:
Subject
- Registers an observer interested in being notified when the internal
state of the class implementing the
Subject
interface
changes.
Implementors should do nothing when the same observer is added more
than once.
- Specified by:
attach
in interface Subject
- Following copied from interface:
oracle.ide.addin.Subject
- Parameters:
observer
- the Observer
interested in change notification
messages.
detach
public void detach(Observer observer)
- Description copied from interface:
Subject
- Unregisters an observer that is not interested anymore in being notified
when the internal state of the class implementing the
Subject
interface changes.
Implementors should do nothing when the same observer is removed more
than once.
- Specified by:
detach
in interface Subject
- Following copied from interface:
oracle.ide.addin.Subject
- Parameters:
observer
- the Observer
disinterested in change
notification messages.
notifyObservers
public void notifyObservers(java.lang.Object observed,
UpdateMessage change)
- Description copied from interface:
Subject
- Notifies all observers that the state of the subject has changed.
- Specified by:
notifyObservers
in interface Subject
- Following copied from interface:
oracle.ide.addin.Subject
- Parameters:
subject
- the subject whose state has changed.change
- what changed.