Tony,
My guess is the DocumentHelper.createXPath method, and how it uses the
org.jaxen.SimpleVariableContext. I was assuming the createXPath method would
"convert" the XPath string with the variable context's replaced, but that
doesn't seem to be it. That is where I plan on starting - when I get back to it.
I've put it aside and have just used a StringBuffer to create my XPath String
instead. Little more cumbersome, but I know that IT works!
good luck
steve
Tony Ms wrote:
> Steve
>
> Thanks.
>
> Can you point me to the class that is meant to do the substitution, so that
> I can put in some diags of my own?
>
> Cheers
>
> Tony
>
> ----- Original Message -----
> From: "Stephen C. Upton" <[EMAIL PROTECTED]>
> To: "BtOW" <[EMAIL PROTECTED]>
> Cc: <[EMAIL PROTECTED]>
> Sent: Friday, October 18, 2002 1:50 PM
> Subject: Re: [dom4j-user] re: Can I use XPath expression as prepared
> statements?
>
> > Tony,
> >
> > Yea, I'm going to have to go back and hit the books (aka docs). I got this
> to
> > work for your example, but can't not get some of my stuff to work, which
> is only
> > a little more complicated, i.e., I use "and" as part of my selection
> criteria.
> >
> > However, to answer your question, I'm using the dom4j-full.jar dated
> 9/24/02
> > (one of the daily builds, as I was having problems with the XMLWriter on
> another
> > problem). I'm not sure what version of jaxen it's using (when I unpack the
> jar,
> > it appears the dates on the jaxen classes are 4/26/02)
> >
> > good luck
> > steve
> >
> > BtOW wrote:
> >
> > > Steve, thanks for your prompt response. I can see the quotes make better
> > > sense. However, it still won't work on my machine - it's failing to do
> the
> > > substitution. I'd expect getText() to return the string with the
> > > substitution in place already.
> > >
> > > To illustrate, I've changed the System.out.println()s to:
> > >
> > > System.out.println("A " + xp.getText());
> > > System.out.println("B " + doc.valueOf(xp.getText()));
> > >
> > > The output I get is:
> > >
> > > A /StateTable/Action[InputEvent="Cash"]/ProcessFile
> > > B Cash.xsl
> > > A /StateTable/Action[InputEvent="$x"]/ProcessFile
> > > B
> > >
> > > Maybe I'm using a different version. I have jaxen-1.0-FCS and
> > > dom4j-patched-1.3
> > >
> > > Cheers
> > >
> > > Tony
> > >
> > > > Tony,
> > > >
> > > > There was an error in James example. Replace your line with this:
> > > > "/StateTable/Action[InputEvent=\"$x\"]/ProcessFile",
> > > >
> > > > with the escaped quotes around the variable, and it works fine. I get
> > > > "Cash.xsl" as the output.
> > > >
> > > > steve
> > > >
> > > > Tony Ms wrote:
> > > >
> > > > > Back in May, James Strachan answered a query with this:
> > > > >
> > > > > Yes its very possible indeed. The trick is to use XPath variables.
> e.g.
> > > > >
> > > > > import org.jaxen.SimpleVariableContext;
> > > > >
> > > > > SimpleVariableContext variables = new SimpleVariableContext();
> > > > > XPath xpath = doc.createXPath( "//foo[@doo=$x]" );
> > > > > xpath.setVariableContext( variables );
> > > > >
> > > > > Then you can set whatever variable value you want for 'x' and apply
> the
> > > > > XPath to any node.
> > > > >
> > > > > variables.setVariableValue( "x", "abc" );
> > > > > List answer = xpath.selectNodes( document );
> > > > > List answer = xpath.selectNodes( someNode );
> > > > >
> > > > > I've been trying to get this to go, and having a problem. Here is
> my
> > > > > program:
> > > > >
> > > > > import java.io.*;
> > > > > import java.util.*;
> > > > > import org.dom4j.*;
> > > > > import org.dom4j.io.*;
> > > > > import org.dom4j.xpath.*;
> > > > > import org.jaxen.SimpleVariableContext;
> > > > >
> > > > > public class XPathTest {
> > > > > static String s1 = "<?xml version=\"1.0\" encoding=\"UTF-8\"?>";
> > > > > static String s2 = "<StateTable>";
> > > > > static String s3 = "<Action>";
> > > > > static String s4 = "<InputEvent>Cash</InputEvent>";
> > > > > static String s5 = "<ProcessFile>Cash.xsl</ProcessFile>";
> > > > > static String s6 = "</Action>";
> > > > > static String s7 = "</StateTable>";
> > > > >
> > > > > public static void main(String[] args){
> > > > > (new XPathTest()).go(s1+s2+s3+s4+s5+s6+s7,
> > > > > "/StateTable/Action[InputEvent=\"Cash\"]/ProcessFile",
> > > > > "n/a");
> > > > > (new XPathTest()).go(s1+s2+s3+s4+s5+s6+s7,
> > > > > "/StateTable/Action[InputEvent=$x]/ProcessFile",
> > > > > "Cash");
> > > > > }
> > > > >
> > > > > void go(String theXML, String expr, String para){
> > > > > try
> > > > > {
> > > > > SAXReader reader = new SAXReader(false);
> > > > > Document doc = reader.read(new StringReader(theXML));
> > > > > XPath xp = doc.createXPath(expr);
> > > > > SimpleVariableContext vc = new SimpleVariableContext();
> > > > > xp.setVariableContext(vc);
> > > > > vc.setVariableValue("x", para);
> > > > > System.out.println(doc.valueOf(xp.getText()));
> > > > > }
> > > > > catch (Exception e)
> > > > > {
> > > > > e.printStackTrace(System.out);
> > > > > }
> > > > > }
> > > > > }
> > > > >
> > > > > The first call to go(), not using a variable, works fine. The second
> > > bombs
> > > > > with:
> > > > >
> > > > > org.dom4j.XPathException: Exception occurred evaluting XPath:
> > > > > /StateTable/Action
> > > > > [InputEvent=$x]/ProcessFile. Exception: Variable {null}:x
> > > > >
> > > > > I'd much appreciate some assistance in finding out what's wrong.
> > > > >
> > > > > Cheers
> > > > >
> > > > > Tony
> > >
> > > > > dom4j-user mailing list
> > > > > [EMAIL PROTECTED]
> > > > > https://lists.sourceforge.net/lists/listinfo/dom4j-user
> > > >
> >
> >
> >
> >
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