BeanContextChildSupport (Java Platform SE 8 )
Keywords: java.beans.beancontext.BeanContextChildSupport class
Date: 2016-12-09

java.beans.beancontext

## Class BeanContextChildSupport

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

- All Implemented Interfaces:
    BeanContextChild, BeanContextServiceRevokedListener, BeanContextServicesListener, Serializable, EventListener
  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:
    1.2
  See Also:
    `BeanContext`, `BeanContextServices`, `BeanContextChild`, Serialized Form

- - ### Field Summary

    Fields
    Modifier and Type | Field and Description
    --- | ---
    `protected BeanContext` | `beanContext` The bean context.
    `BeanContextChild` | `beanContextChildPeer` The `BeanContext` in which this `BeanContextChild` is nested.
    `protected PropertyChangeSupport` | `pcSupport` The `PropertyChangeSupport` associated with this `BeanContextChildSupport`.
    `protected boolean` | `rejectedSetBCOnce` A flag indicating that there has been at least one `PropertyChangeVetoException` thrown for the attempted setBeanContext operation.
    `protected VetoableChangeSupport` | `vcSupport` The `VetoableChangeSupport` associated with this `BeanContextChildSupport`.

  - ### Constructor Summary

    Constructors
    Constructor and Description
    `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

    All Methods Instance Methods Concrete Methods
    Modifier and Type | Method and Description
    --- | ---
    `void` | `addPropertyChangeListener(String name, PropertyChangeListener pcl)` Add a PropertyChangeListener for a specific property.
    `void` | `addVetoableChangeListener(String name, VetoableChangeListener vcl)` Add a VetoableChangeListener for a specific property.
    `void` | `firePropertyChange(String name, Object oldValue, Object newValue)` Report a bound property update to any registered listeners.
    `void` | `fireVetoableChange(String name, Object oldValue, Object newValue)` Report a vetoable property update to any registered listeners.
    `BeanContext` | `getBeanContext()` Gets the nesting `BeanContext` for this `BeanContextChildSupport`.
    `BeanContextChild` | `getBeanContextChildPeer()` Gets the `BeanContextChild` associated with this `BeanContextChildSupport`.
    `protected void` | `initializeBeanContextResources()` This method may be overridden by subclasses to provide their own initialization behaviors.
    `boolean` | `isDelegated()` Reports whether or not this class is a delegate of another.
    `protected void` | `releaseBeanContextResources()` This method may be overridden by subclasses to provide their own release behaviors.
    `void` | `removePropertyChangeListener(String name, PropertyChangeListener pcl)` Remove a PropertyChangeListener for a specific property.
    `void` | `removeVetoableChangeListener(String name, VetoableChangeListener vcl)` Removes a `VetoableChangeListener`.
    `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)` Sets the `BeanContext` for this `BeanContextChildSupport`.
    `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

      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.

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