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From Dmitri Plotnikov <dmi...@apache.org>
Subject Re: [JXPath] How to use JXPath for Parsing (not Evaluating) XPath?
Date Tue, 09 Aug 2005 19:38:33 GMT
Yaron,

Sorry, I forgot that getExpression() is declared as protected. So, you
don't really have access to the tree unless you change that method from
protected to public. Perhaps you could make that change locally.

I hope this helps.

- Dmitri



--- yaron kanza <yaron.kanza@gmail.com> wrote:

> Dmitri,
> 
> In the JXPathCompiledExpression API, I could only find methods for
> evaluating an expression. But I don't need to evaluate the
> expression.
> I need to parse it.
> 
> When you use Xerces to parse XML, for example, you can create a 
> DocumentBuilder, use it to parse a document and then you receive a
> Document object which is the root of the DOM tree:
> 
> DocumentBuilder builder = factory.newDocumentBuilder();
> Document doc = builder.parse("myDocument.xml");
>     
> What is the equivalent to this in JXPath?
> 
> Thank you,
> 
> Yaron
> 
> 
> Thank you
> 
> On 8/6/05, Dmitri Plotnikov <dmitri@apache.org> wrote:
> > Yaron,
> > 
> > CompiledExpression is merely an interface.  If you cast it to the
> concrete
> > class JXPathCompiledExpression, you will be able to traverse the
> tree.
> > 
> > If you are using Eclipse, you can always select an interface, press
> > Control-T, and see all classes implementing that interface.  Same,
> if you
> > use Control-T on a class, you will see all subclasses.
> > 
> > - Dmitri
> > 
> > 
> > ----- Original Message -----
> > From: "yaron kanza" <yaron.kanza@gmail.com>
> > To: "Jakarta Commons Users List" <commons-user@jakarta.apache.org>;
> > <dmitri@apache.org>
> > Sent: Friday, August 05, 2005 6:16 PM
> > Subject: Re: [JXPath] How to use JXPath for Parsing (not
> Evaluating) XPath?
> > 
> > 
> > Hello Dmitri,
> > 
> > Thank you for the quick response.
> > 
> > I was looking at the API of JXPathContext and I found the method
> > static CompiledExpression compile(java.lang.String xpath).
> > However, I couldn't find methods to traverse the parsed tree in the
> > CompileExpression class. So, I don't see how the compile method
> helps
> > me.
> > 
> > For example, suppose that I compile an expression //a/b[c=2]/d.
> Then,
> > how do I get the tree that represents the expression---a tree whose
> > root represents a descendant-or-self axis, the child of the root
> > represents the node-name "a", etc?
> > 
> > It will help me a lot if you will explain to me how to get the tree
> > that represents the expression (or the root of it).
> > 
> > Thank you very much,
> > 
> > Yaron
> > 
> > 
> > On 8/5/05, Dmitri Plotnikov <dmitri@apache.org> wrote:
> > > Yaron,
> > >
> > > JXPath will do that for you.  It does compile expressions (use
> the
> > > static method on JXPathContext) and returns a tree.
> > > One nice feature of that three is that if you call toString() on
> any
> > > subtree, it returns the XPath it represents.
> > >
> > > - Dmitri
> > >
> > > --- yaron kanza <yaron.kanza@gmail.com> wrote:
> > >
> > > > Hello,
> > > >
> > > > I need an XPath parser. That is, a tool that receives an XPath
> > > > expression and returns either an object tree that represents
> the
> > > > expression (DOM style) or a series of events (SAX style).
> > > >
> > > > Is JXPath the right tool for parsing XPath expressions?
> > > > If not, what is the right tool for parsing XPath?
> > > >
> > > > In the user's guide I found only examples showing how to use
> JXPath
> > > > for evaluating XPath expressions. I didn't find example showing
> how
> > > > to
> > > > parse XPath.
> > > >
> > > > Can someone please provide me more information on how to use
> JXPath
> > > > for parsing expressions?
> > > >
> > > > Does someone have examples showing how to use JXPath as a
> parser?
> > > >
> > > > Thank you,
> > > >
> > > > Yaron Kanza
> > > > The University of Toronto, Canada
> > > >
> > > >
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> > >
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> >
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> > 
> > 
> > 
> > 
> >
> 
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> 


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