java.beans.beancontext
public interface BeanContextChild
The difference between a BeanContext and a
BeanContextChild, mainly, is that a
BeanContext may be a parent.
BeanContextChild instances will be serialized at some
point in their life, but you need to make sure your bean context does
not contain a serializable reference (directly or indirectly) to the
parent BeanContext, to any of the other
BeanContexts in the tree, or to any resources obtained
via the BeanContextServices interface. One way to do this
is to mark any fields that contain such references as
transient. Another way is to use a custom serializer.
If you do not do this, when the BeanContext is serialized,
all the other BeanContexts and other unnecessary things
will be serialized along with it.
Before dying, a BeanContextChild should call
getBeanContext().remove(this) to detach from the
hierarchy and exit cleanly.
Since: JDK1.2
See Also: BeanContext
| Method Summary | |
|---|---|
| void | addPropertyChangeListener(String prop, PropertyChangeListener listener)
Add a listener that will be notified when a specific property changes. |
| void | addVetoableChangeListener(String prop, VetoableChangeListener listener)
Add a listener that will be notified when a specific property
change is requested (a PropertyVetoException may be thrown) as
well as after the change is successfully made.
|
| BeanContext | getBeanContext()
Get the parent BeanContext. |
| void | removePropertyChangeListener(String prop, PropertyChangeListener listener)
Remove a listener to a certain property. |
| void | removeVetoableChangeListener(String prop, VetoableChangeListener listener)
Remove a listener to a certain property. |
| void | setBeanContext(BeanContext parent)
Set the parent BeanContext.
|
Parameters: prop the name of the property to listen on listener the listener to listen on the property.
Parameters: prop the name of the property to listen on listener the listener to listen on the property.
BeanContext.Returns: the parent BeanContext.
Parameters: prop the name of the property being listened on listener the listener listening on the property.
Parameters: prop the name of the property being listened on listener the listener listening on the property.
BeanContext.
This method is called from BeanContext.add() and
should not be called directly.
When this Object is being added to a new BeanContext or moved from an old one, a non-null value will be passed in.
When this Object is being removed from the current
BeanContext, setBeanContext() will
receive the parameter null.
When being removed from the current BeanContext,
it is the BeanContextChild's responsibility to
release all services it has obtained.
This change should generate PropertyChangeEvent
and VetoableChangeEvents with the property name
"beanContext". If the change is vetoed, it must re-throw the
exception and not change anything. In this way, the parent
BeanContextChild, who has registered himself with
you, will have a chance to remove this child from its
collection.
If the Bean does not wish to change the parent or be removed
from one, it may throw the PropertyVetoException.
If you veto a setBeanContext(null) call, then you
should try your hardest to remedy whatever problem is keeping
you from being removed from the BeanContext so
that you can not veto it the next time.
Otherwise, nasty pathological recursion stuff could occur in
certain situations.
If you do veto the change, you must first back out any changes you made prior to the veto. Best not to make any such changes prior to the veto in the first place.
This method is called from BeanContext.add() and
should not be called directly.
Parameters: parent the new parent for the BeanContextChild,
or null to signify removal from a tree.
Throws: PropertyVetoException if the
BeanContextChild implementor does not
wish to have its parent changed.