Java java.beans.beancontext Class BeanContextChildSupport（JDK8）

Field Detail

• beanContextChildPeer

  public BeanContextChild beanContextChildPeer

  The BeanContext in which this BeanContextChild is nested.

• pcSupport

  protected PropertyChangeSupport pcSupport

  The PropertyChangeSupport associated with this BeanContextChildSupport.

• vcSupport

  protected VetoableChangeSupport vcSupport

  The VetoableChangeSupport associated with this BeanContextChildSupport.

• beanContext

  protected transient BeanContext beanContext

  The bean context.

• rejectedSetBCOnce

  protected transient boolean rejectedSetBCOnce

  A flag indicating that there has been at least one PropertyChangeVetoException thrown for the attempted setBeanContext operation.

Constructor Detail

• BeanContextChildSupport

  public BeanContextChildSupport()

  construct a BeanContextChildSupport where this class has been subclassed in order to implement the JavaBean component itself.

• BeanContextChildSupport

  public BeanContextChildSupport(BeanContextChild bcc)

  construct a BeanContextChildSupport where the JavaBean component itself implements BeanContextChild, and encapsulates this, delegating that interface to this implementation

  Parameters:

  bcc - the underlying bean context child

Method Detail

• setBeanContext

  public void setBeanContext(BeanContext bc)
                      throws PropertyVetoException

  Sets the BeanContext for this BeanContextChildSupport.

  Specified by:

  setBeanContext in interface BeanContextChild

  Parameters:

  bc - the new value to be assigned to the BeanContext property

  Throws:

  PropertyVetoException - if the change is rejected

• getBeanContext

  public BeanContext getBeanContext()

  Gets the nesting BeanContext for this BeanContextChildSupport.

  Specified by:

  getBeanContext in interface BeanContextChild

  Returns:

  the nesting BeanContext for this BeanContextChildSupport.

• addPropertyChangeListener

  public void addPropertyChangeListener(String name,
                                        PropertyChangeListener pcl)

  Add a PropertyChangeListener for a specific property. The same listener object may be added more than once. For each property, the listener will be invoked the number of times it was added for that property. If name or pcl is null, no exception is thrown and no action is taken.

  Specified by:

  addPropertyChangeListener in interface BeanContextChild

  Parameters:

  name - The name of the property to listen on

  pcl - The PropertyChangeListener to be added

• removePropertyChangeListener

  public void removePropertyChangeListener(String name,
                                           PropertyChangeListener pcl)

  Remove a PropertyChangeListener for a specific property. If pcl was added more than once to the same event source for the specified property, it will be notified one less time after being removed. If name is null, no exception is thrown and no action is taken. If pcl is null, or was never added for the specified property, no exception is thrown and no action is taken.

  Specified by:

  removePropertyChangeListener in interface BeanContextChild

  Parameters:

  name - The name of the property that was listened on

  pcl - The PropertyChangeListener to be removed

• addVetoableChangeListener

  public void addVetoableChangeListener(String name,
                                        VetoableChangeListener vcl)

  Add a VetoableChangeListener for a specific property. The same listener object may be added more than once. For each property, the listener will be invoked the number of times it was added for that property. If name or vcl is null, no exception is thrown and no action is taken.

  Specified by:

  addVetoableChangeListener in interface BeanContextChild

  Parameters:

  name - The name of the property to listen on

  vcl - The VetoableChangeListener to be added

• removeVetoableChangeListener

  public void removeVetoableChangeListener(String name,
                                           VetoableChangeListener vcl)

  Removes a VetoableChangeListener. If pcl was added more than once to the same event source for the specified property, it will be notified one less time after being removed. If name is null, no exception is thrown and no action is taken. If vcl is null, or was never added for the specified property, no exception is thrown and no action is taken.

  Specified by:

  removeVetoableChangeListener in interface BeanContextChild

  Parameters:

  name - The name of the property that was listened on

  vcl - The VetoableChangeListener to be removed

• serviceRevoked

  public void serviceRevoked(BeanContextServiceRevokedEvent bcsre)

  A service provided by the nesting BeanContext has been revoked. Subclasses may override this method in order to implement their own behaviors.

  Specified by:

  serviceRevoked in interface BeanContextServiceRevokedListener

  Parameters:

  bcsre - The BeanContextServiceRevokedEvent fired as a result of a service being revoked

• serviceAvailable

  public void serviceAvailable(BeanContextServiceAvailableEvent bcsae)

  A new service is available from the nesting BeanContext. Subclasses may override this method in order to implement their own behaviors

  Specified by:

  serviceAvailable in interface BeanContextServicesListener

  Parameters:

  bcsae - The BeanContextServiceAvailableEvent fired as a result of a service becoming available

• getBeanContextChildPeer

  public BeanContextChild getBeanContextChildPeer()

  Gets the BeanContextChild associated with this BeanContextChildSupport.

  Returns:

  the BeanContextChild peer of this class

• isDelegated

  public boolean isDelegated()

  Reports whether or not this class is a delegate of another.

  Returns:

  true if this class is a delegate of another

• firePropertyChange

  public void firePropertyChange(String name,
                                 Object oldValue,
                                 Object newValue)

  Report a bound property update to any registered listeners. No event is fired if old and new are equal and non-null.

  Parameters:

  name - The programmatic name of the property that was changed

  oldValue - The old value of the property

  newValue - The new value of the property

• fireVetoableChange

  public void fireVetoableChange(String name,
                                 Object oldValue,
                                 Object newValue)
                          throws PropertyVetoException

  Report a vetoable property update to any registered listeners. If anyone vetos the change, then fire a new event reverting everyone to the old value and then rethrow the PropertyVetoException.

  No event is fired if old and new are equal and non-null.

  Parameters:

  name - The programmatic name of the property that is about to change

  oldValue - The old value of the property

  newValue - - The new value of the property

  Throws:

  PropertyVetoException - if the recipient wishes the property change to be rolled back.

• validatePendingSetBeanContext

  public boolean validatePendingSetBeanContext(BeanContext newValue)

  Called from setBeanContext to validate (or otherwise) the pending change in the nesting BeanContext property value. Returning false will cause setBeanContext to throw PropertyVetoException.

  Parameters:

  newValue - the new value that has been requested for the BeanContext property

  Returns:

  true if the change operation is to be vetoed

• releaseBeanContextResources

  protected void releaseBeanContextResources()

  This method may be overridden by subclasses to provide their own release behaviors. When invoked any resources held by this instance obtained from its current BeanContext property should be released since the object is no longer nested within that BeanContext.

• initializeBeanContextResources

  protected void initializeBeanContextResources()

  This method may be overridden by subclasses to provide their own initialization behaviors. When invoked any resources required by the BeanContextChild should be obtained from the current BeanContext.