Class BeanContextSupport

protected ArrayList<E> bcmListeners

protected HashMap<K,V> children

protected boolean designTime

protected Locale locale

protected boolean okToUseGui

public BeanContextSupport()

Construct a BeanContextSupport instance.

public BeanContextSupport(BeanContext peer)

Construct a BeanContextSupport instance.

Parameters:

peer - the bean context peer (null permitted).

public BeanContextSupport(BeanContext peer,
                          Locale locale)

Construct a BeanContextSupport instance.

Parameters:

peer - the bean context peer (null permitted).

locale - the locale (null permitted, equivalent to the default locale).

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

Construct a BeanContextSupport instance.

Parameters:

peer - the bean context peer (null permitted).

locale - the locale (null permitted, equivalent to the default locale).

dtime - a flag indicating whether or not the bean context is in design time mode.

public BeanContextSupport(BeanContext peer,
                          Locale locale,
                          boolean dtime,
                          boolean visible)

Construct a BeanContextSupport instance.

Parameters:

peer - the bean context peer (null permitted).

locale - the locale (null permitted, equivalent to the default locale).

dtime - a flag indicating whether or not the bean context is in design time mode.

visible - initial value of the okToUseGui flag.

public boolean add(Object targetChild)

Add a child to the bean context. A child can be a simple Object, a BeanContextChild or another BeanContext.

The children of a BeanContext form a set. As a result, this method returns false if the given object is already a child of this context.

If the child is a BeanContextChild, or a proxy for such a child, the setBeanContext() method is invoked on the child. If this operation is vetoed by the child, via throwing a PropertyVetoException, then the current completion state of the add() operation is rolled back and a IllegalStateException is thrown. If the BeanContextChild is successfully added, then the context registers with its PropertyChangeListener and VetoableChangeListener for "beanContext" events.

If the child implements java.beans.Visibility, then its ability to use a GUI is set based on that of this context.

A BeanContextMembershipEvent is fired when the child is successfully added to the bean context.

This method is synchronized over the global hierarchy lock.

Parameters:

targetChild - the child to add.

Returns:

false if the child has already been added.

Throws:

IllegalArgumentException - if the child is null.

IllegalStateException - if the child vetos the setting of its context.

public boolean addAll(Collection<E> c)

public void addBeanContextMembershipListener(BeanContextMembershipListener listener)

Add a listener on changes to the membership of this BeanContext object.

Specified by:

addBeanContextMembershipListener in interface BeanContext

Parameters:

listener - the listener to add.

public boolean avoidingGui()

Returns true if this bean needs a GUI but is being prevented from using one.

Specified by:

avoidingGui in interface Visibility

Returns:

true if needsGui() is true but the bean has been told not to use it.

protected Iterator<E> bcsChildren()

protected void bcsPreDeserializationHook(ObjectInputStream ois)
            throws ClassNotFoundException,
                   IOException

Subclasses may use this method to perform their own deserialization after the default deserialization process has taken place, but prior to the deserialization of the children. It should not be used to replace the implementation of readObject in the subclass.

Parameters:

ois - the input stream.

Throws:

ClassNotFoundException - if the class of an object being deserialized could not be found.

IOException - if an I/O error occurs.

protected void bcsPreSerializationHook(ObjectOutputStream oos)
            throws IOException

Subclasses may use this method to perform their own serialization after the default serialization process has taken place, but prior to the serialization of the children. It should not be used to replace the implementation of writeObject in the subclass.

Parameters:

oos - the output stream.

Throws:

IOException - if an I/O error occurs.

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

Called when a child is deserialized.

Parameters:

child - the deserialized child.

bcsc - the deserialized context wrapper for the child.

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

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

protected static final boolean classEquals(Class<T> first,
                                           Class<T> second)

public void clear()

Clear the collection, such that a subsequent call to isEmpty() would return true.

Specified by:

clear in interface Collection<E>

Throws:

UnsupportedOperationException - if this collection does not support the clear operation.

public boolean contains(Object o)

Test whether this collection contains a given object as one of its elements.

Specified by:

contains in interface Collection<E>

Parameters:

o - the element to look for.

Returns:

true if this collection contains at least one element e such that o == null ? e == null : o.equals(e).

Throws:

ClassCastException - if the type of o is not a valid type for this collection.

NullPointerException - if o is null and this collection doesn't support null values.

public boolean containsAll(Collection<E> c)

public boolean containsKey(Object o)

protected final Object[] copyChildren()

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

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

Deserializes objects (written by serialize(ObjectOutputStream,Collection)) and adds them to the specified collection.

Parameters:

ois - the input stream (null not permitted).

coll - the collection to add the objects to (null not permitted).

Throws:

ClassNotFoundException -

IOException -

See Also:

serialize(ObjectOutputStream,Collection)

public void dontUseGui()

Informs this bean that is should not make use of the GUI.

Specified by:

dontUseGui in interface Visibility

protected final void fireChildrenAdded(BeanContextMembershipEvent bcme)

protected final void fireChildrenRemoved(BeanContextMembershipEvent bcme)

public BeanContext getBeanContextPeer()

Returns the bean context peer.

Returns:

The bean context peer.

See Also:

BeanContextChildSupport.beanContextChildPeer

protected static final BeanContextChild getChildBeanContextChild(Object child)

Returns the BeanContextChild implementation for the given child.

Parameters:

child - the child (null permitted).

Returns:

The bean context child.

Throws:

IllegalArgumentException - if child implements both the BeanContextChild and BeanContextProxy interfaces.

protected static final BeanContextMembershipListener getChildBeanContextMembershipListener(Object child)

Returns child as an instance of BeanContextMembershipListener, or null if child does not implement that interface.

Parameters:

child - the child (null permitted).

Returns:

The child cast to BeanContextMembershipListener.

protected static final PropertyChangeListener getChildPropertyChangeListener(Object child)

Returns child as an instance of PropertyChangeListener, or null if child does not implement that interface.

Parameters:

child - the child (null permitted).

Returns:

The child cast to PropertyChangeListener.

protected static final Serializable getChildSerializable(Object child)

Returns child as an instance of Serializable, or null if child does not implement that interface.

Parameters:

child - the child (null permitted).

Returns:

The child cast to Serializable.

protected static final VetoableChangeListener getChildVetoableChangeListener(Object child)

Returns child as an instance of VetoableChangeListener, or null if child does not implement that interface.

Parameters:

child - the child (null permitted).

Returns:

The child cast to VetoableChangeListener.

protected static final Visibility getChildVisibility(Object child)

Returns child as an instance of Visibility, or null if child does not implement that interface.

Parameters:

child - the child (null permitted).

Returns:

The child cast to Visibility.

public Locale getLocale()

public URL getResource(String name,
                       BeanContextChild bcc)

Get a resource. The BeanContext will typically call ClassLoader.getResource(), but may do it any way it wants to. This allows a BeanContext to have its own set of resources separate from the rest of the system.

Beans should call this method on their parent rather than the associated ClassLoader method.

I am assuming, but am not entirely sure, that if a BeanContext cannot find a resource, its responsibility is to call the getResource method of its parent BeanContext.

Specified by:

getResource in interface BeanContext

Parameters:

Returns:

a URL to the requested resource.

See Also:

ClassLoader.getResource(String)

public InputStream getResourceAsStream(String name,
                                       BeanContextChild bcc)

Get a resource as a stream. The BeanContext will typically call ClassLoader.getResourceAsStream(), but may do it any way it wants to. This allows a BeanContext's children to have their own set of resources separate from the rest of the system.

Beans should call this method on their parent rather than the associated ClassLoader method.

I am assuming, but am not entirely sure, that if a BeanContext cannot find a resource, its responsibility is to call the getResourceAsStream method of its parent BeanContext.

Specified by:

getResourceAsStream in interface BeanContext

Parameters:

Returns:

the requested resource as a stream.

See Also:

ClassLoader.getResourceAsStream(String)

protected void initialize()

public Object instantiateChild(String beanName)
            throws IOException,
                   ClassNotFoundException

This is a convenience method for instantiating a bean inside this context. It delegates to the appropriate method in java.beans.Beans using the context's classloader.

Specified by:

instantiateChild in interface BeanContext

Parameters:

beanName - the name of the class of bean to instantiate.

Throws:

IOException - if an I/O error occurs in loading the class.

ClassNotFoundException - if the class, beanName, can not be found.

public boolean isDesignTime()

Returns true if the BeanContext is in design time mode, and false if it is in runtime mode.

Specified by:

isDesignTime in interface DesignMode

Returns:

A boolean.

See Also:

setDesignTime(boolean)

public boolean isEmpty()

Returns true if this bean context has no children.

Specified by:

isEmpty in interface Collection<E>

Returns:

true if there are no children.

public boolean isSerializing()

Returns true if the bean context is in the process of being serialized.

Returns:

true if the context is being serialized.

public Iterator<E> iterator()

Obtain an Iterator over this collection.

Specified by:

iterator in interface Collection<E>

iterator in interface Iterable<E>

Returns:

an Iterator over the elements of this collection, in any order.

public boolean needsGui()

Returns false as this bean does not a GUI for its operation.

Specified by:

needsGui in interface Visibility

Returns:

false

public void okToUseGui()

Informs this bean that it is okay to make use of the GUI.

Specified by:

okToUseGui in interface Visibility

public void propertyChange(PropertyChangeEvent pce)

Subclasses may use this method to catch property changes arising from the children of this context. At present, we just listen for the beans being assigned to a different context and remove them from here if such an event occurs.

Specified by:

propertyChange in interface PropertyChangeListener

Parameters:

pce - the property change event.

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

Deerializes the children using the deserialize(ObjectInputStream, Collection method and then calls childDeserializedHook(Object, BCSChild) for each child deserialized.

Parameters:

Throws:

IOException - if an I/O error occurs.

public boolean remove(Object targetChild)

Remove the specified child from the context. This is the same as calling remove(Object,boolean) with a request for the setBeanContext() method of the child to be called (i.e. the second argument is true).

Specified by:

remove in interface Collection<E>

Parameters:

targetChild - the child to remove.

protected boolean remove(Object targetChild,
                         boolean callChildSetBC)

Removes a child from the bean context. A child can be a simple Object, a BeanContextChild or another BeanContext. If the given child is not a child of this context, this method returns false.

If the child is a BeanContextChild, or a proxy for such a child, the setBeanContext() method is invoked on the child (if specified). If this operation is vetoed by the child, via throwing a PropertyVetoException, then the current completion state of the remove() operation is rolled back and a IllegalStateException is thrown. If the BeanContextChild is successfully removed, then the context deregisters with its PropertyChangeListener and VetoableChangeListener for "beanContext" events.

A BeanContextMembershipEvent is fired when the child is successfully removed from the bean context.

This method is synchronized over the global hierarchy lock.

Parameters:

targetChild - the child to remove.

callChildSetBC - true if the setBeanContext() method of the child should be called.

Returns:

false if the child doesn't exist.

Throws:

IllegalArgumentException - if the child is null.

IllegalStateException - if the child vetos the setting of its context.

public boolean removeAll(Collection<E> c)

public void removeBeanContextMembershipListener(BeanContextMembershipListener bcml)

Remove a listener on changes to the membership of this BeanContext object.

Specified by:

removeBeanContextMembershipListener in interface BeanContext

Parameters:

public boolean retainAll(Collection<E> c)

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

Writes the items in the collection to the specified output stream. Items in the collection that are not instances of Serializable (this includes null) are simply ignored.

Parameters:

oos - the output stream (null not permitted).

coll - the collection (null not permitted).

Throws:

IOException -

See Also:

deserialize(ObjectInputStream,Collection)

public void setDesignTime(boolean dtime)

Sets the flag that indicates whether or not the BeanContext is in design mode. If the flag changes value, a PropertyChangeEvent (with the property name 'designMode') is sent to registered listeners. Note that the property name used here does NOT match the specification in the DesignMode interface, we match the reference implementation instead - see bug parade entry 4295174.

Specified by:

setDesignTime in interface DesignMode

Parameters:

dtime - the new value for the flag.

See Also:

isDesignTime()

public void setLocale(Locale newLocale)
            throws PropertyVetoException

public int size()

Get the number of elements in this collection.

Specified by:

size in interface Collection<E>

Returns:

the number of elements in the collection.

public Object[] toArray()

Returns an array containing the children of this BeanContext.

Specified by:

toArray in interface Collection<E>

Returns:

An array containing the children.

public Object[] toArray(Object[] array)

Populates, then returns, the supplied array with the children of this BeanContext. If the array is too short to hold the children, a new array is allocated and returned. If the array is too long, it is padded with null items at the end.

Parameters:

array - an array to populate (null not permitted).

protected boolean validatePendingAdd(Object targetChild)

protected boolean validatePendingRemove(Object targetChild)

public void vetoableChange(PropertyChangeEvent pce)
            throws PropertyVetoException

Subclasses may use this method to veto changes arising from the children of this context.

Specified by:

vetoableChange in interface VetoableChangeListener

Parameters:

pce - the vetoable property change event fired.

public final void writeChildren(ObjectOutputStream oos)
            throws IOException

Serializes the children using the serialize(ObjectOutputStream, Collection method.

Parameters:

oos - the output stream.

Throws:

IOException - if an I/O error occurs.