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java.beans.beancontext
Class BeanContextChildSupport

java.lang.Object
  |
  +--java.beans.beancontext.BeanContextChildSupport

Direct Known Subclasses:

BeanContextSupport

public class BeanContextChildSupport

extends Object

implements BeanContextChild, BeanContextServicesListener, Serializable

This is a general support class to provide support for implementing the BeanContextChild protocol. This class may either be directly subclassed, or encapsulated and delegated to in order to implement this interface for a given component.

Since:

JDK1.2

See Also:

Serialized Form

Field Summary

protected BeanContext	beanContext
BeanContextChild	beanContextChildPeer
protected PropertyChangeSupport	pcSupport
protected boolean	rejectedSetBCOnce
protected VetoableChangeSupport	vcSupport

Constructor Summary

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

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

Method Summary

void	addPropertyChangeListener(String name, PropertyChangeListener pcl) add a property change listener
void	addVetoableChangeListener(String name, VetoableChangeListener vcl) add a vetoable change listener
void	firePropertyChange(String name, Object oldValue, Object newValue) fires a propertyChange Event
void	fireVetoableChange(String name, Object oldValue, Object newValue) fires a vetoableChange Event
BeanContext	getBeanContext()
BeanContextChild	getBeanContextChildPeer()
protected void	initializeBeanContextResources() This method may be overridden by subclasses to provide their own initialization behaviors.
boolean	isDelegated()
protected void	releaseBeanContextResources() This method may be overridden by subclasses to provide their own release behaviors.
void	removePropertyChangeListener(String name, PropertyChangeListener pcl) remove a property change listener
void	removeVetoableChangeListener(String name, VetoableChangeListener vcl) remove a vetoable change listener
void	serviceAvailable(BeanContextServiceAvailableEvent bcsae) a new service is available from the nesting BeanContext.
void	serviceRevoked(BeanContextServiceRevokedEvent bcsre) a service provided by the nesting BeanContext has been revoked.
void	setBeanContext(BeanContext bc) setBeanContext
boolean	validatePendingSetBeanContext(BeanContext newValue) called from setBeanContext to validate (or otherwise) the pending change in the nesting BeanContext property value.

Methods inherited from class java.lang.Object

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

Field Detail

beanContextChildPeer

public BeanContextChild beanContextChildPeer

pcSupport

protected PropertyChangeSupport pcSupport

vcSupport

protected VetoableChangeSupport vcSupport

beanContext

protected transient BeanContext beanContext

rejectedSetBCOnce

protected transient boolean rejectedSetBCOnce

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

Method Detail

setBeanContext

public void setBeanContext(BeanContext bc)
                    throws PropertyVetoException

setBeanContext

Specified by:

setBeanContext in interface BeanContextChild

Tags copied from interface: BeanContextChild

Parameters:

propertyName - "beanContext"

oldValue - the previous nesting BeanContext instance, or null

newValue - the current nesting BeanContext instance, or null

A change in the value of the nesting BeanContext property of this BeanContextChild may be vetoed by throwing the appropriate exception.

getBeanContext

public BeanContext getBeanContext()

Specified by:

getBeanContext in interface BeanContextChild

addPropertyChangeListener

public void addPropertyChangeListener(String name,
                                      PropertyChangeListener pcl)

add a property change listener

Specified by:

addPropertyChangeListener in interface BeanContextChild

removePropertyChangeListener

public void removePropertyChangeListener(String name,
                                         PropertyChangeListener pcl)

remove a property change listener

Specified by:

removePropertyChangeListener in interface BeanContextChild

addVetoableChangeListener

public void addVetoableChangeListener(String name,
                                      VetoableChangeListener vcl)

add a vetoable change listener

Specified by:

addVetoableChangeListener in interface BeanContextChild

removeVetoableChangeListener

public void removeVetoableChangeListener(String name,
                                         VetoableChangeListener vcl)

remove a vetoable change listener

Specified by:

removeVetoableChangeListener in interface BeanContextChild

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

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

getBeanContextChildPeer

public BeanContextChild getBeanContextChildPeer()

Returns:

the BeanContextChild peer of this class

isDelegated

public boolean isDelegated()

Returns:

true if this class is a delegate of another

firePropertyChange

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

fires a propertyChange Event

fireVetoableChange

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

fires a vetoableChange Event

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.

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 requried by the BeanContextChild should be obtained from the current BeanContext.