/**
* @param name the name of the resource requested.
* @param bcc the child object making the request.
* @return the requested resource as an InputStream
*/
public URL getResource(String name, BeanContextChild bcc) {
if (name == null) throw new NullPointerException("name");
if (bcc == null) throw new NullPointerException("bcc");
if (containsKey(bcc)) {
ClassLoader cl = bcc.getClass().getClassLoader();
return cl != null ? cl.getResource(name) : ClassLoader.getSystemResource(name);
} else throw new IllegalArgumentException("Not a valid child");
}
/**
* 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
*/
public final void readChildren(ObjectInputStream ois) throws IOException, ClassNotFoundException {
int count = serializable;
while (count-- > 0) {
Object child = null;
BeanContextSupport.BCSChild bscc = null;
try {
child = ois.readObject();
bscc = (BeanContextSupport.BCSChild) ois.readObject();
} catch (IOException ioe) {
continue;
} catch (ClassNotFoundException cnfe) {
continue;
}
synchronized (child) {
BeanContextChild bcc = null;
try {
bcc = (BeanContextChild) child;
} catch (ClassCastException cce) {
// do nothing;
}
if (bcc != null) {
try {
bcc.setBeanContext(getBeanContextPeer());
bcc.addPropertyChangeListener("beanContext", childPCL);
bcc.addVetoableChangeListener("beanContext", childVCL);
} catch (PropertyVetoException pve) {
continue;
}
}
childDeserializedHook(child, bscc);
}
}
}
/**
* internal remove used when removal caused by unexpected <tt>setBeanContext</tt> or by
* <tt>remove()</tt> invocation.
*
* @param targetChild the JavaBean, BeanContext, or Object to be removed
* @param callChildSetBC used to indicate that the child should be notified that it is no longer
* nested in this <tt>BeanContext</tt>.
*/
protected boolean remove(Object targetChild, boolean callChildSetBC) {
if (targetChild == null) throw new IllegalArgumentException();
synchronized (BeanContext.globalHierarchyLock) {
if (!containsKey(targetChild)) return false;
if (!validatePendingRemove(targetChild)) {
throw new IllegalStateException();
}
BCSChild bcsc = (BCSChild) children.get(targetChild);
BCSChild pbcsc = null;
Object peer = null;
// we are required to notify the child that it is no longer nested here if
// it implements java.beans.beancontext.BeanContextChild
synchronized (targetChild) {
if (callChildSetBC) {
BeanContextChild cbcc = getChildBeanContextChild(targetChild);
if (cbcc != null)
synchronized (cbcc) {
cbcc.removePropertyChangeListener("beanContext", childPCL);
cbcc.removeVetoableChangeListener("beanContext", childVCL);
try {
cbcc.setBeanContext(null);
} catch (PropertyVetoException pve1) {
cbcc.addPropertyChangeListener("beanContext", childPCL);
cbcc.addVetoableChangeListener("beanContext", childVCL);
throw new IllegalStateException();
}
}
}
synchronized (children) {
children.remove(targetChild);
if (bcsc.isProxyPeer()) {
pbcsc = (BCSChild) children.get(peer = bcsc.getProxyPeer());
children.remove(peer);
}
}
if (getChildSerializable(targetChild) != null) serializable--;
childJustRemovedHook(targetChild, bcsc);
if (peer != null) {
if (getChildSerializable(peer) != null) serializable--;
childJustRemovedHook(peer, pbcsc);
}
}
fireChildrenRemoved(
new BeanContextMembershipEvent(
getBeanContextPeer(),
peer == null ? new Object[] {targetChild} : new Object[] {targetChild, peer}));
}
return true;
}
/**
* Adds/nests a child within this <tt>BeanContext</tt>.
*
* <p>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.
*
* @param targetChild The child objects to nest within this <tt>BeanContext</tt>
* @return true if the child was added successfully.
* @see #validatePendingAdd
*/
public boolean add(Object targetChild) {
if (targetChild == null) throw new IllegalArgumentException();
// The specification requires that we do nothing if the child
// is already nested herein.
if (children.containsKey(targetChild)) return false; // test before locking
synchronized (BeanContext.globalHierarchyLock) {
if (children.containsKey(targetChild)) return false; // check again
if (!validatePendingAdd(targetChild)) {
throw new IllegalStateException();
}
// The specification requires that we invoke setBeanContext() on the
// newly added child if it implements the java.beans.beancontext.BeanContextChild interface
BeanContextChild cbcc = getChildBeanContextChild(targetChild);
BeanContextChild bccp = null;
synchronized (targetChild) {
if (targetChild instanceof BeanContextProxy) {
bccp = ((BeanContextProxy) targetChild).getBeanContextProxy();
if (bccp == null) throw new NullPointerException("BeanContextPeer.getBeanContextProxy()");
}
BCSChild bcsc = createBCSChild(targetChild, bccp);
BCSChild pbcsc = null;
synchronized (children) {
children.put(targetChild, bcsc);
if (bccp != null) children.put(bccp, pbcsc = createBCSChild(bccp, targetChild));
}
if (cbcc != null)
synchronized (cbcc) {
try {
cbcc.setBeanContext(getBeanContextPeer());
} catch (PropertyVetoException pve) {
synchronized (children) {
children.remove(targetChild);
if (bccp != null) children.remove(bccp);
}
throw new IllegalStateException();
}
cbcc.addPropertyChangeListener("beanContext", childPCL);
cbcc.addVetoableChangeListener("beanContext", childVCL);
}
Visibility v = getChildVisibility(targetChild);
if (v != null) {
if (okToUseGui) v.okToUseGui();
else v.dontUseGui();
}
if (getChildSerializable(targetChild) != null) serializable++;
childJustAddedHook(targetChild, bcsc);
if (bccp != null) {
v = getChildVisibility(bccp);
if (v != null) {
if (okToUseGui) v.okToUseGui();
else v.dontUseGui();
}
if (getChildSerializable(bccp) != null) serializable++;
childJustAddedHook(bccp, pbcsc);
}
}
// The specification requires that we fire a notification of the change
fireChildrenAdded(
new BeanContextMembershipEvent(
getBeanContextPeer(),
bccp == null ? new Object[] {targetChild} : new Object[] {targetChild, bccp}));
}
return true;
}
