[JXPath] Variables containing DOM data

[Ruud Diterwich]

Dmitri,

I've downloaded the latest sources (10-Nov-2002), but still the same
problems. I've solved my problem for now, but I have insufficient
knowledge of the design JXPath internals:

In JXPathContextReferenceImpl I changed this:

    public Object getValue(String xpath, Expression expr){
        Object result = expr.computeValue(getRootContext());
        if (result == null && !lenient){
            throw new JXPathException("No value for xpath: " + xpath);
        }

        if (result instanceof EvalContext){
            EvalContext ctx = (EvalContext)result;
            result = ctx.getSingleNodePointer();
        }
        if (result instanceof NodePointer){
            result = ((NodePointer)result).getValue();
        }
        // addition by Ruud Diterwich allows variables containing
DOMNodePointers
        if (result instanceof NodePointer){
            result = ((NodePointer)result).getValue();
        }
        return result;
    }

This way, returning DOMNodePointers from Variables.getVariable would do
the trick. However, some of my test cases result in an infinite loop.
The other thing I tried is to add a line to
BasicTypeConverter.convert(object, toType):

        if (object instanceof Node && toType == String.class) {
                return new DOMNodePointer((Node) object,
Locale.getDefault()).getValue().toString(); 
        }

Now, Variable.getVariable should return a straight DOM node. This works
for me, but seems a bit of a hack. I've no idea what to do with the
locale parameter either...

Hope this helps a bit.

Regards,

Ruud Diterwich


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