Java java.beans.beancontext Class BeanContextSupport（JDK8）

Field Detail

• children

  protected transient HashMap children

  all accesses to the protected HashMap children field shall be synchronized on that object.

• bcmListeners

  protected transient ArrayList bcmListeners

  all accesses to the protected ArrayList bcmListeners field shall be synchronized on that object.

• locale

  protected Locale locale

  The current locale of this BeanContext.

• okToUseGui

  protected boolean okToUseGui

  A boolean indicating if this instance may now render a GUI.

• designTime

  protected boolean designTime

  A boolean indicating whether or not this object is currently in design time mode.

Constructor Detail

• BeanContextSupport

  public BeanContextSupport(BeanContext peer,
                            Locale lcle,
                            boolean dTime,
                            boolean visible)

  Construct a BeanContextSupport instance

  Parameters:

  peer - The peer BeanContext we are supplying an implementation for, or null if this object is its own peer

  lcle - The current Locale for this BeanContext. If lcle is null, the default locale is assigned to the BeanContext instance.

  dTime - The initial state, true if in design mode, false if runtime.

  visible - The initial visibility.

  See Also:

  Locale.getDefault(), Locale.setDefault(java.util.Locale)

• BeanContextSupport

  public BeanContextSupport(BeanContext peer,
                            Locale lcle,
                            boolean dtime)

  Create an instance using the specified Locale and design mode.

  Parameters:

  peer - The peer BeanContext we are supplying an implementation for, or null if this object is its own peer

  lcle - The current Locale for this BeanContext. If lcle is null, the default locale is assigned to the BeanContext instance.

  dtime - The initial state, true if in design mode, false if runtime.

  See Also:

  Locale.getDefault(), Locale.setDefault(java.util.Locale)

• BeanContextSupport

  public BeanContextSupport(BeanContext peer,
                            Locale lcle)

  Create an instance using the specified locale

  Parameters:

  peer - The peer BeanContext we are supplying an implementation for, or null if this object is its own peer

  lcle - The current Locale for this BeanContext. If lcle is null, the default locale is assigned to the BeanContext instance.

  See Also:

  Locale.getDefault(), Locale.setDefault(java.util.Locale)

• BeanContextSupport

  public BeanContextSupport(BeanContext peer)

  Create an instance using with a default locale

  Parameters:

  peer - The peer BeanContext we are supplying an implementation for, or null if this object is its own peer

• BeanContextSupport

  public BeanContextSupport()

  Create an instance that is not a delegate of another object

Method Detail

• getBeanContextPeer

  public BeanContext getBeanContextPeer()

  Gets the instance of BeanContext that this object is providing the implementation for.

  Returns:

  the BeanContext instance

• instantiateChild

  public Object instantiateChild(String beanName)
                          throws IOException,
                                 ClassNotFoundException

  The instantiateChild method is a convenience hook in BeanContext to simplify the task of instantiating a Bean, nested, into a BeanContext.

  The semantics of the beanName parameter are defined by java.beans.Beans.instantiate.

  Specified by:

  instantiateChild in interface BeanContext

  Parameters:

  beanName - the name of the Bean to instantiate within this BeanContext

  Returns:

  the new object

  Throws:

  IOException - if there is an I/O error when the bean is being deserialized

  ClassNotFoundException - if the class identified by the beanName parameter is not found

• size

  public int size()

  Gets the number of children currently nested in this BeanContext.

  Specified by:

  size in interface Collection

  Returns:

  number of children

• isEmpty

  public boolean isEmpty()

  Reports whether or not this BeanContext is empty. A BeanContext is considered empty when it contains zero nested children.

  Specified by:

  isEmpty in interface Collection

  Returns:

  if there are not children

• contains

  public boolean contains(Object o)

  Determines whether or not the specified object is currently a child of this BeanContext.

  Specified by:

  contains in interface Collection

  Parameters:

  o - the Object in question

  Returns:

  if this object is a child

• containsKey

  public boolean containsKey(Object o)

  Determines whether or not the specified object is currently a child of this BeanContext.

  Parameters:

  o - the Object in question

  Returns:

  if this object is a child

• iterator

  public Iterator iterator()

  Gets all JavaBean or BeanContext instances currently nested in this BeanContext.

  Specified by:

  iterator in interface Iterable

  Specified by:

  iterator in interface Collection

  Returns:

  an Iterator of the nested children

• toArray

  public Object[] toArray()

  Gets all JavaBean or BeanContext instances currently nested in this BeanContext.

  Specified by:

  toArray in interface Collection

  Returns:

  an array containing all of the elements in this collection

• toArray

  public Object[] toArray(Object[] arry)

  Gets an array containing all children of this BeanContext that match the types contained in arry.

  Specified by:

  toArray in interface Collection

  Parameters:

  arry - The array of object types that are of interest.

  Returns:

  an array of children

• createBCSChild

  protected BeanContextSupport.BCSChild createBCSChild(Object targetChild,
                                                       Object peer)

  Subclasses can override this method to insert their own subclass of Child without having to override add() or the other Collection methods that add children to the set.

  Parameters:

  targetChild - the child to create the Child on behalf of

  peer - the peer if the tragetChild and the peer are related by an implementation of BeanContextProxy * @return Subtype-specific subclass of Child without overriding collection methods

• add

  public boolean add(Object targetChild)

  Adds/nests a child within this BeanContext.

  Invoked as a side effect of java.beans.Beans.instantiate(). If the child object is not valid for adding then this method throws an IllegalStateException.

  Specified by:

  add in interface Collection

  Parameters:

  targetChild - The child objects to nest within this BeanContext

  Returns:

  true if the child was added successfully.

  See Also:

  validatePendingAdd(java.lang.Object)

• remove

  public boolean remove(Object targetChild)

  Removes a child from this BeanContext. If the child object is not for adding then this method throws an IllegalStateException.

  Specified by:

  remove in interface Collection

  Parameters:

  targetChild - The child objects to remove

  Returns:

  true if an element was removed as a result of this call

  See Also:

  validatePendingRemove(java.lang.Object)

• remove

  protected boolean remove(Object targetChild,
                           boolean callChildSetBC)

  internal remove used when removal caused by unexpected setBeanContext or by remove() invocation.

  Parameters:

  targetChild - the JavaBean, BeanContext, or Object to be removed

  callChildSetBC - used to indicate that the child should be notified that it is no longer nested in this BeanContext.

  Returns:

  whether or not was present before being removed

• containsAll

  public boolean containsAll(Collection c)

  Tests to see if all objects in the specified Collection are children of this BeanContext.

  Specified by:

  containsAll in interface Collection

  Parameters:

  c - the specified Collection

  Returns:

  true if all objects in the collection are children of this BeanContext, false if not.

  See Also:

  Collection.contains(Object)

• addAll

  public boolean addAll(Collection c)

  add Collection to set of Children (Unsupported) implementations must synchronized on the hierarchy lock and "children" protected field

  Specified by:

  addAll in interface Collection

  Parameters:

  c - collection containing elements to be added to this collection

  Returns:

  this implementation unconditionally throws UnsupportedOperationException

  Throws:

  UnsupportedOperationException - thrown unconditionally by this implementation

  See Also:

  Collection.add(Object)

• removeAll

  public boolean removeAll(Collection c)

  remove all specified children (Unsupported) implementations must synchronized on the hierarchy lock and "children" protected field

  Specified by:

  removeAll in interface Collection

  Parameters:

  c - collection containing elements to be removed from this collection

  Returns:

  this implementation unconditionally throws UnsupportedOperationException

  Throws:

  UnsupportedOperationException - thrown unconditionally by this implementation

  See Also:

  Collection.remove(Object), Collection.contains(Object)

• retainAll

  public boolean retainAll(Collection c)

  retain only specified children (Unsupported) implementations must synchronized on the hierarchy lock and "children" protected field

  Specified by:

  retainAll in interface Collection

  Parameters:

  c - collection containing elements to be retained in this collection

  Returns:

  this implementation unconditionally throws UnsupportedOperationException

  Throws:

  UnsupportedOperationException - thrown unconditionally by this implementation

  See Also:

  Collection.remove(Object), Collection.contains(Object)

• clear

  public void clear()

  clear the children (Unsupported) implementations must synchronized on the hierarchy lock and "children" protected field

  Specified by:

  clear in interface Collection

  Throws:

  UnsupportedOperationException - thrown unconditionally by this implementation

• addBeanContextMembershipListener

  public void addBeanContextMembershipListener(BeanContextMembershipListener bcml)

  Adds a BeanContextMembershipListener

  Specified by:

  addBeanContextMembershipListener in interface BeanContext

  Parameters:

  bcml - the BeanContextMembershipListener to add

  Throws:

  NullPointerException - if the argument is null

• removeBeanContextMembershipListener

  public void removeBeanContextMembershipListener(BeanContextMembershipListener bcml)

  Removes a BeanContextMembershipListener

  Specified by:

  removeBeanContextMembershipListener in interface BeanContext

  Parameters:

  bcml - the BeanContextMembershipListener to remove

  Throws:

  NullPointerException - if the argument is null

• getResourceAsStream

  public InputStream getResourceAsStream(String name,
                                         BeanContextChild bcc)

  Description copied from interface: BeanContext
  Analagous to java.lang.ClassLoader.getResourceAsStream(), this method allows a BeanContext implementation to interpose behavior between the child Component and underlying ClassLoader.

  Specified by:

  getResourceAsStream in interface BeanContext

  Parameters:

  name - the name of the resource requested.

  bcc - the child object making the request.

  Returns:

  the requested resource as an InputStream

  Throws:

  NullPointerException - if the argument is null

• getResource

  public URL getResource(String name,
                         BeanContextChild bcc)

  Description copied from interface: BeanContext
  Analagous to java.lang.ClassLoader.getResource(), this method allows a BeanContext implementation to interpose behavior between the child Component and underlying ClassLoader.

  Specified by:

  getResource in interface BeanContext

  Parameters:

  name - the name of the resource requested.

  bcc - the child object making the request.

  Returns:

  the requested resource as an InputStream

• setDesignTime

  public void setDesignTime(boolean dTime)

  Sets the new design time value for this BeanContext.

  Specified by:

  setDesignTime in interface DesignMode

  Parameters:

  dTime - the new designTime value

  See Also:

  BeanContext, BeanContextMembershipListener, PropertyChangeEvent

• isDesignTime

  public boolean isDesignTime()

  Reports whether or not this object is in currently in design time mode.

  Specified by:

  isDesignTime in interface DesignMode

  Returns:

  true if in design time mode, false if not

• setLocale

  public void setLocale(Locale newLocale)
                 throws PropertyVetoException

  Sets the locale of this BeanContext.

  Parameters:

  newLocale - the new locale. This method call will have no effect if newLocale is null.

  Throws:

  PropertyVetoException - if the new value is rejected

• getLocale

  public Locale getLocale()

  Gets the locale for this BeanContext.

  Returns:

  the current Locale of the BeanContext

• needsGui

  public boolean needsGui()

  This method is typically called from the environment in order to determine if the implementor "needs" a GUI.

  The algorithm used herein tests the BeanContextPeer, and its current children to determine if they are either Containers, Components, or if they implement Visibility and return needsGui() == true.

  Specified by:

  needsGui in interface Visibility

  Returns:

  true if the implementor needs a GUI

• dontUseGui

  public void dontUseGui()

  notify this instance that it may no longer render a GUI.

  Specified by:

  dontUseGui in interface Visibility

• okToUseGui

  public void okToUseGui()

  Notify this instance that it may now render a GUI

  Specified by:

  okToUseGui in interface Visibility

• avoidingGui

  public boolean avoidingGui()

  Used to determine if the BeanContext child is avoiding using its GUI.

  Specified by:

  avoidingGui in interface Visibility

  Returns:

  is this instance avoiding using its GUI?

  See Also:

  Visibility

• isSerializing

  public boolean isSerializing()

  Is this BeanContext in the process of being serialized?

  Returns:

  if this BeanContext is currently being serialized

• bcsChildren

  protected Iterator bcsChildren()

  Returns an iterator of all children of this BeanContext.

  Returns:

  an iterator for all the current BCSChild values

• bcsPreSerializationHook

  protected void bcsPreSerializationHook(ObjectOutputStream oos)
                                  throws IOException

  called by writeObject after defaultWriteObject() but prior to serialization of currently serializable children. This method may be overridden by subclasses to perform custom serialization of their state prior to this superclass serializing the children. This method should not however be used by subclasses to replace their own implementation (if any) of writeObject().

  Parameters:

  oos - the ObjectOutputStream to use during serialization

  Throws:

  IOException - if serialization failed

• bcsPreDeserializationHook

  protected void bcsPreDeserializationHook(ObjectInputStream ois)
                                    throws IOException,
                                           ClassNotFoundException

  called by readObject after defaultReadObject() but prior to deserialization of any children. This method may be overridden by subclasses to perform custom deserialization of their state prior to this superclass deserializing the children. This method should not however be used by subclasses to replace their own implementation (if any) of readObject().

  Parameters:

  ois - the ObjectInputStream to use during deserialization

  Throws:

  IOException - if deserialization failed

  ClassNotFoundException - if needed classes are not found

• childDeserializedHook

  protected void childDeserializedHook(Object child,
                                       BeanContextSupport.BCSChild bcsc)

  Called by readObject with the newly deserialized child and BCSChild.

  Parameters:

  child - the newly deserialized child

  bcsc - the newly deserialized BCSChild

• serialize

  protected final void serialize(ObjectOutputStream oos,
                                 Collection coll)
                          throws IOException

  Used by writeObject to serialize a Collection.

  Parameters:

  oos - the ObjectOutputStream to use during serialization

  coll - the Collection to serialize

  Throws:

  IOException - if serialization failed

• deserialize

  protected final void deserialize(ObjectInputStream ois,
                                   Collection coll)
                            throws IOException,
                                   ClassNotFoundException

  used by readObject to deserialize a collection.

  Parameters:

  ois - the ObjectInputStream to use

  coll - the Collection

  Throws:

  IOException - if deserialization failed

  ClassNotFoundException - if needed classes are not found

• writeChildren

  public final void writeChildren(ObjectOutputStream oos)
                           throws IOException

  Used to serialize all children of this BeanContext.

  Parameters:

  oos - the ObjectOutputStream to use during serialization

  Throws:

  IOException - if serialization failed

• readChildren

  public final void readChildren(ObjectInputStream ois)
                          throws IOException,
                                 ClassNotFoundException

  When an instance of this class is used as a delegate for the implementation of the BeanContext protocols (and its subprotocols) there exists a 'chicken and egg' problem during deserialization

  Parameters:

  ois - the ObjectInputStream to use

  Throws:

  IOException - if deserialization failed

  ClassNotFoundException - if needed classes are not found

• vetoableChange

  public void vetoableChange(PropertyChangeEvent pce)
                      throws PropertyVetoException

  subclasses may envelope to monitor veto child property changes.

  Specified by:

  vetoableChange in interface VetoableChangeListener

  Parameters:

  pce - a PropertyChangeEvent object describing the event source and the property that has changed.

  Throws:

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

• propertyChange

  public void propertyChange(PropertyChangeEvent pce)

  subclasses may envelope to monitor child property changes.

  Specified by:

  propertyChange in interface PropertyChangeListener

  Parameters:

  pce - A PropertyChangeEvent object describing the event source and the property that has changed.

• validatePendingAdd

  protected boolean validatePendingAdd(Object targetChild)

  Subclasses of this class may override, or envelope, this method to add validation behavior for the BeanContext to examine child objects immediately prior to their being added to the BeanContext.

  Parameters:

  targetChild - the child to create the Child on behalf of

  Returns:

  true iff the child may be added to this BeanContext, otherwise false.

• validatePendingRemove

  protected boolean validatePendingRemove(Object targetChild)

  Subclasses of this class may override, or envelope, this method to add validation behavior for the BeanContext to examine child objects immediately prior to their being removed from the BeanContext.

  Parameters:

  targetChild - the child to create the Child on behalf of

  Returns:

  true iff the child may be removed from this BeanContext, otherwise false.

• childJustAddedHook

  protected void childJustAddedHook(Object child,
                                    BeanContextSupport.BCSChild bcsc)

  subclasses may override this method to simply extend add() semantics after the child has been added and before the event notification has occurred. The method is called with the child synchronized.

  Parameters:

  child - the child

  bcsc - the BCSChild

• childJustRemovedHook

  protected void childJustRemovedHook(Object child,
                                      BeanContextSupport.BCSChild bcsc)

  subclasses may override this method to simply extend remove() semantics after the child has been removed and before the event notification has occurred. The method is called with the child synchronized.

  Parameters:

  child - the child

  bcsc - the BCSChild

• getChildVisibility

  protected static final Visibility getChildVisibility(Object child)

  Gets the Component (if any) associated with the specified child.

  Parameters:

  child - the specified child

  Returns:

  the Component (if any) associated with the specified child.

• getChildSerializable

  protected static final Serializable getChildSerializable(Object child)

  Gets the Serializable (if any) associated with the specified Child

  Parameters:

  child - the specified child

  Returns:

  the Serializable (if any) associated with the specified Child

• getChildPropertyChangeListener

  protected static final PropertyChangeListener getChildPropertyChangeListener(Object child)

  Gets the PropertyChangeListener (if any) of the specified child

  Parameters:

  child - the specified child

  Returns:

  the PropertyChangeListener (if any) of the specified child

• getChildVetoableChangeListener

  protected static final VetoableChangeListener getChildVetoableChangeListener(Object child)

  Gets the VetoableChangeListener (if any) of the specified child

  Parameters:

  child - the specified child

  Returns:

  the VetoableChangeListener (if any) of the specified child

• getChildBeanContextMembershipListener

  protected static final BeanContextMembershipListener getChildBeanContextMembershipListener(Object child)

  Gets the BeanContextMembershipListener (if any) of the specified child

  Parameters:

  child - the specified child

  Returns:

  the BeanContextMembershipListener (if any) of the specified child

• getChildBeanContextChild

  protected static final BeanContextChild getChildBeanContextChild(Object child)

  Gets the BeanContextChild (if any) of the specified child

  Parameters:

  child - the specified child

  Returns:

  the BeanContextChild (if any) of the specified child

  Throws:

  IllegalArgumentException - if child implements both BeanContextChild and BeanContextProxy

• fireChildrenAdded

  protected final void fireChildrenAdded(BeanContextMembershipEvent bcme)

  Fire a BeanContextshipEvent on the BeanContextMembershipListener interface

  Parameters:

  bcme - the event to fire

• fireChildrenRemoved

  protected final void fireChildrenRemoved(BeanContextMembershipEvent bcme)

  Fire a BeanContextshipEvent on the BeanContextMembershipListener interface

  Parameters:

  bcme - the event to fire

• initialize

  protected void initialize()

  protected method called from constructor and readObject to initialize transient state of BeanContextSupport instance. This class uses this method to instantiate inner class listeners used to monitor PropertyChange and VetoableChange events on children. subclasses may envelope this method to add their own initialization behavior

• copyChildren

  protected final Object[] copyChildren()

  Gets a copy of the this BeanContext's children.

  Returns:

  a copy of the current nested children

• classEquals

  protected static final boolean classEquals(Class first,
                                             Class second)

  Tests to see if two class objects, or their names are equal.

  Parameters:

  first - the first object

  second - the second object

  Returns:

  true if equal, false if not