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
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