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java.beans.beancontext
Class BeanContextChildSupport  

java.lang.Object
  java.beans.beancontext.BeanContextChildSupport

All Implemented Interfaces:

BeanContextChild, BeanContextServiceRevokedListener, BeanContextServicesListener, java.util.EventListener, java.io.Serializable

Direct Known Subclasses:

BeanContextSupport

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public class BeanContextChildSupport

extends java.lang.Object

implements BeanContextChild, BeanContextServicesListener, java.io.Serializable

Support for creating a BeanContextChild. This class contains the most common implementations of the methods in the BeanContextChild

Since:

1.2

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Field Summary
protected  BeanContext	beanContext           The parent BeanContext.
BeanContextChild	beanContextChildPeer           The peer on which to perform set actions.
protected  java.beans.PropertyChangeSupport	pcSupport           Listeners are registered here and events are fired through here.
protected  boolean	rejectedSetBCOnce           If setBeanContext() was vetoed once before, this is set to true so that the next time, vetoes will be ignored.
(package private) static long	serialVersionUID
protected  java.beans.VetoableChangeSupport	vcSupport           Listeners are registered here and events are fired through here.

 

Constructor Summary

BeanContextChildSupport()           Create a new BeanContextChildSupport with itself as the peer.

BeanContextChildSupport(BeanContextChild peer)           Create a new BeanContextChildSupport with the specified peer.

 

Method Summary
void	addPropertyChangeListener(java.lang.String propertyName, java.beans.PropertyChangeListener listener)           Add a listener that will be notified when a specific property changes.
void	addVetoableChangeListener(java.lang.String propertyName, java.beans.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.
void	firePropertyChange(java.lang.String propertyName, java.lang.Object oldVal, java.lang.Object newVal)           Fire a property change.
void	fireVetoableChange(java.lang.String propertyName, java.lang.Object oldVal, java.lang.Object newVal)           Fire a vetoable property change.
BeanContext	getBeanContext()           Get the parent BeanContext.
BeanContextChild	getBeanContextChildPeer()           Get the peer (or this if there is no peer).
protected  void	initializeBeanContextResources()           Called by setBeanContext() to grab resources when the parent has been set.
boolean	isDelegated()           Determine whether there is a peer.
protected  void	releaseBeanContextResources()           Called by setBeanContext() to release resources of a what will soon no longer be the parent.
void	removePropertyChangeListener(java.lang.String propertyName, java.beans.PropertyChangeListener listener)           Remove a listener to a certain property.
void	removeVetoableChangeListener(java.lang.String propertyName, java.beans.VetoableChangeListener listener)           Remove a listener to a certain property.
void	serviceAvailable(BeanContextServiceAvailableEvent event)           Called by BeanContextServices whenever a service is made available.
void	serviceRevoked(BeanContextServiceRevokedEvent event)           Called by BeanContextServices.revokeService() to indicate that a service has been revoked.
void	setBeanContext(BeanContext newBeanContext)           Set the parent BeanContext.
boolean	validatePendingSetBeanContext(BeanContext newBeanContext)           Called by setBeanContext() to determine whether the set should be rejected.

 

Methods inherited from class java.lang.Object

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

 

Field Detail

serialVersionUID

static final long serialVersionUID

See Also:

Constant Field Values

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beanContextChildPeer

public BeanContextChild beanContextChildPeer

The peer on which to perform set actions. This is here so that this class can be used as a peer.

When extending this class, this variable will be set to this.

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beanContext

protected transient BeanContext beanContext

The parent BeanContext.

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rejectedSetBCOnce

protected transient boolean rejectedSetBCOnce

If setBeanContext() was vetoed once before, this is set to true so that the next time, vetoes will be ignored.

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pcSupport

protected java.beans.PropertyChangeSupport pcSupport

Listeners are registered here and events are fired through here.

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vcSupport

protected java.beans.VetoableChangeSupport vcSupport

Listeners are registered here and events are fired through here.

Constructor Detail

BeanContextChildSupport

public BeanContextChildSupport()

Create a new BeanContextChildSupport with itself as the peer. This is meant to be used when you subclass BeanContextChildSupport to create your child.

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BeanContextChildSupport

public BeanContextChildSupport(BeanContextChild peer)

Create a new BeanContextChildSupport with the specified peer.

Method Detail

setBeanContext

public void setBeanContext(BeanContext newBeanContext)
                    throws java.beans.PropertyVetoException

Set the parent BeanContext.

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.

Order of events:

1. If the new BeanContext is the same as the old one, nothing happens.
2. If the change has not been rejected or vetoed before, call validatePendingSetBeanContext(). If this call returns false, the change is rejected and a PropertyVetoException is thrown.
3. If the change has not been rejected or vetoed before, VetoableChangeEvents are fired with the name "beanContext", using the fireVetoableChange() method. If a veto occurs, reversion events are fired using the same method, the change is rejected, and the veto is rethrown.
4. releaseBeanContextResources() is called.
5. The change is made.
6. PropertyChangeEvents are fired using the firePropertyChange() method.
7. initializeBeanContextResources() is called.

Specified by:

setBeanContext in interface BeanContextChild

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getBeanContext

public BeanContext getBeanContext()

Get the parent BeanContext.

Specified by:

getBeanContext in interface BeanContextChild

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getBeanContextChildPeer

public BeanContextChild getBeanContextChildPeer()

Get the peer (or this if there is no peer).

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isDelegated

public boolean isDelegated()

Determine whether there is a peer. This is true iff getBeanContextChildPeer() == this.

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addPropertyChangeListener

public void addPropertyChangeListener(java.lang.String propertyName,
                                      java.beans.PropertyChangeListener listener)

Add a listener that will be notified when a specific property changes.

Specified by:

addPropertyChangeListener in interface BeanContextChild

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removePropertyChangeListener

public void removePropertyChangeListener(java.lang.String propertyName,
                                         java.beans.PropertyChangeListener listener)

Remove a listener to a certain property.

Specified by:

removePropertyChangeListener in interface BeanContextChild

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addVetoableChangeListener

public void addVetoableChangeListener(java.lang.String propertyName,
                                      java.beans.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.

Specified by:

addVetoableChangeListener in interface BeanContextChild

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removeVetoableChangeListener

public void removeVetoableChangeListener(java.lang.String propertyName,
                                         java.beans.VetoableChangeListener listener)

Remove a listener to a certain property.

Specified by:

removeVetoableChangeListener in interface BeanContextChild

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firePropertyChange

public void firePropertyChange(java.lang.String propertyName,
                               java.lang.Object oldVal,
                               java.lang.Object newVal)

Fire a property change.

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fireVetoableChange

public void fireVetoableChange(java.lang.String propertyName,
                               java.lang.Object oldVal,
                               java.lang.Object newVal)
                        throws java.beans.PropertyVetoException

Fire a vetoable property change.

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serviceRevoked

public void serviceRevoked(BeanContextServiceRevokedEvent event)

Called by BeanContextServices.revokeService() to indicate that a service has been revoked. If you have a reference to such a service, it should be discarded and may no longer function properly. getService() will no longer work on the specified service class after this event has been fired.

This method is meant to be overriden. BeanContextChildSupport's implementation does nothing.

Specified by:

serviceRevoked in interface BeanContextServiceRevokedListener

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serviceAvailable

public void serviceAvailable(BeanContextServiceAvailableEvent event)

Called by BeanContextServices whenever a service is made available.

This method is meant to be overriden. BeanContextChildSupport's implementation does nothing.

Specified by:

serviceAvailable in interface BeanContextServicesListener

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validatePendingSetBeanContext

public boolean validatePendingSetBeanContext(BeanContext newBeanContext)

Called by setBeanContext() to determine whether the set should be rejected.

This method is meant to be overriden. BeanContextChildSupport's implementation simply returns true.

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releaseBeanContextResources

protected void releaseBeanContextResources()

Called by setBeanContext() to release resources of a what will soon no longer be the parent.

This method is meant to be overriden. BeanContextChildSupport's implementation does nothing.

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initializeBeanContextResources

protected void initializeBeanContextResources()

Called by setBeanContext() to grab resources when the parent has been set.

This method is meant to be overriden. BeanContextChildSupport's implementation does nothing.

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Overview  Package   Class  Use  Deprecated  Index
Home >> All >> java >> beans >> [ beancontext overview ]	PREV CLASS  NEXT CLASS
SUMMARY:  JAVADOC |  SOURCE |  DOWNLOAD | NESTED | FIELD | CONSTR | METHOD	DETAIL: FIELD | CONSTR | METHOD

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