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JavaME Internal DOM classes  RSS feed

 
Greenhorn
Posts: 1
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Hi,

I need to implement my own org.w3c.dom.Element class that later on is used as a node in a org.w3c.dom.Document instance.
My own element class essentially implements the required interface and everything works fine, at least in a Java standard edition.

Running it on a micro edition (v 8) I do see some unexpected behaviour. I get a class cast exception.

java.lang.ClassCastException
- com/sun/ukit/dom/XParent.appendChild(), bci=21

Looking for the code I found the following on [1]

public Node appendChild(Node newChild)
throws DOMException
{
if (_isRO())
throw new DOMException(DOMException.NO_MODIFICATION_ALLOWED_ERR, "");

XNode nchild = (XNode)newChild;
if (newChild.getNodeType() != DOCUMENT_FRAGMENT_NODE) {
// Append a new child node.
_appendChild(nchild);
_childAdded(nchild);
} else {
// Recursive call to appendChild for each child of doc fragment
while (nchild.getLength() > 0)
appendChild(nchild.item(0));
}
return nchild;
}


It looks like each newChild node gets casted to XNode. First of all I wonder why and second I would like to know how I can now write my own Node classes. I cannot simply extend XNode given that it seems internal somehow.

Any ideas? Thank you very much for every hint,


-- Daniel

[1] https://svn.java.net/svn/phoneme~svn/components/jsr280/branches/jsr280-cr-6781500/src/share/oi/com/sun/ukit/dom/XParent.java
 
It is sorta covered in the JavaRanch Style Guide.
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