I am not sure I understand why it should work. Like Michael said, how is Xerces supposed to know that Elements are to be of type 'SecElement'? The only thing
you specified is the document class name so unless code is added in the document class such that any new element will be a SecElementImpl,
its correct to see a ClassCastException.
The code you just gave does not work in version 1.4.4 of Xerces either unless the snippet you gave is incomplete.
Thanks
Ankit Pasricha
XML Parser Development
IBM Toronto Lab
8200 Warden Avenue, Ontario L6G 1C7
Phone: (905) 413 4941
| "[EMAIL PROTECTED]"
<[EMAIL PROTECTED]>
02/23/2005 07:47 AM
|
|
I have a better example which better show my problem :
public interface SecNode extends Node {
}
public interface SecElement extends SecNode {
}
public class SecElementImpl extends ElementImpl implements
SecElement {
}
public interface SecElementNS extends SecElement {
}
public class SecElementNSImpl extends ElementNSImpl
implements SecElementNS {
}
public interface SecDocument extends SecNode {
}
public class SecDocumentImpl extends DocumentImpl implements
SecDocument {
}
In this class, when I try this :
SecNode root = (SecNode)this.getDocumentElement();
or
SecElement root = (SecElement)this.getDocumentElement();
I get this Exception :
java.lang.ClassCastException:
org.apache.xerces.dom.ElementNSImpl
but only with xerces version >= 2
with previouses it perfectly works.
What is the problem ?
---------- Initial Header -----------
>From : Michael Glavassevich <[EMAIL PROTECTED]>
To : [EMAIL PROTECTED]
Cc :
Date : Mon, 21 Feb 2005 17:05:17 -0500
Subject : Re: java.lang.ClassCastException:
org.apache.xerces.dom.ElementNSImpl
Perhaps I'm missing something but it seems you've extended
Node but not
ElementNSImpl to implement this new interface. You'd also
have to return
an instance of the subclass from Document.createElementNS().
If you
haven't done that then the ClassCastException should be
expected since the
element doesn't implement SecureDocument.
"[EMAIL PROTECTED]" <[EMAIL PROTECTED]> wrote on 02/21/2005
11:11:05 AM:
> Hello,
>
> I got a strange exception. Here is my problem :
>
> public interface SecureDocument extends Node {
> }
>
> public class SecDocImpl extends DocumentImpl {
>
> public static void main(String[] args) {
>
> try {
>
> InputStream is = new
FileInputStream("pathtofile");
> DOMParser p = new DOMParser();
>
>
>
p.setProperty("http://apache.org/xml/properties/dom/document-class-name",
> "mypackage.SecDocImpl");
>
> p.parse(new InputSource(is));
> SecDocImpl m= (SecDocImpl)p.getDocument() ;
> is.close();
>
> DocumentImpl tmp = (DocumentImpl)m ;
> Element e = tmp.getDocumentElement() ;
> Node r = (Node)e ; //it's just to try
> here is the error------> SecureDocument root =
> (SecureDocument)e ;
>
> } catch (Exception e) {
> System.err.println("error") ;
> }
> }
> }
> }
>
> And the exception is :
> java.lang.ClassCastException:
> org.apache.xerces.dom.ElementNSImpl
>
> with no more explanation.
>
> Can anybody help me ?
>
>
>
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Michael Glavassevich
XML Parser Development
IBM Toronto Lab
E-mail: [EMAIL PROTECTED]
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