Hi,
The second way you propose
should not work AFAIK, because
you would have the same method with
different returntypes. I think that this
is not allowed according to JavaLangSpec.
Cloneing is no possible way, sine cloneable
is not supported by the classes.
Just my 2c.
Sven
===========================================
Sven Reimers
AB 2-05
Arbeitsbereich fuer
Prozessautomatisierungstechnik
TU Hamburg-Harburg
===========================================
Thomas Bensler wrote:
>
> Hi folks,
>
> we are developing a Java application (using Xerces, latest release)
> which should be able to create a "customized" DOM tree out of a flat XML
> file. The word "customized" means that the tree (mostly) consists of
> myElementImpl (instead of ElementImpl). myElementImpl is derived from
> ElementImpl and contains some additional properties (i. e. a reference
> of a object tree representing the content declaration of that element
> type which is not a part of DOM).
>
> Putting it into practice may done as follows:
>
> - new class myDOMParser derived from DOMParser
> - call setDocumentClassName("myDocumentImpl") in constructor to
> switch the document factory
> - new class myDocumentImpl derived from DocumentImpl
> - override createElement(java.lang.String) to produce
> myElementImpl objects instead ElementImpl objects
>
> The original source code of DocumentImpl.createElement is:
>
> public Element createElement(String tagName) throws DOMException {
> if (!isXMLName(tagName)) {
> throw new DOMExceptionImpl(DOMException.INVALID_CHARACTER_ERR,
> "INVALID_CHARACTER_ERR");
> }
> return new ElementImpl(this, tagName);
> }
>
> <QUESTION>
> If I do it like this:
>
> class myDocumentImpl extends DocumentImpl {
> createElement(String tagname) throws DOMException {
> Element localElement = super.createElement(tagname);
> ...
> }
> }
>
> ... how can I make a new myElementImpl object out of localElement
> (which is a ElementImpl instance)? Some kind of cloning? No idea.
>
> If I do it like this:
>
> class myDocumentImpl extends DocumentImpl throws DOMException {
> myDocumentImpl.createElement(String tagname) {
> // no super call
> if (!isXMLName(tagName)) {
> throw new DOMExceptionImpl(...);
> }
> return new myElementImpl(this, tagname);
> }
> }
>
> ... I would lose functionality of DocumentImpl.createElement (okay
> there is not much code in it but I do not want to lose it anyway).
> </QUESTION>
>
> Any suggestions how to solve this problem?
>
> Thank you for helping!!
>
> Ciao, Bens.
> ______________________________________________________________________
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