Hello,
Thanks for the reply, I tested that as well with the following code
(sorry about the largish amount of code):
---
*
package* com.ziath.eventregistration.email.test;
*
import* java.util.ArrayList;
*import* java.util.List;
*
import* org.apache.commons.jxpath.JXPathContext;
*
import* junit.framework.TestCase;
*
public* *class* JXPathTestCase *extends* *TestCase* {
*private *List<Person> objTestList = *null*;
*public* *void* setUp(){
objTestList = *new* ArrayList<Person>();
Person objPerson1 = *new* Person("Neil", "Dave", "Benn");
Person objPerson2 = *new* Person("John", "Bob", "Smith");
objTestList.add(objPerson1);
objTestList.add(objPerson2);
}
*public* *void* *testJXPathDirectCall*(){
JXPathContext objContext = JXPathContext.*newContext*(objTestList);
System.*out*.println(objContext.getValue(".[1]/getName(.[1], 1)"));
}
*public* *void* testJXPathRelativeMethodCall(){
JXPathContext objContext = JXPathContext.*newContext*(objTestList);
System.*out*.println(objContext.getRelativeContext(
objContext.getPointer(".[1]"))
.getValue("getName(., 1)"));
}
*private* *static* *class* Person{
*private* List<String> lstNames = *null*;
/**
* [EMAIL PROTECTED] strFirstName
* [EMAIL PROTECTED] *strMiddleName*
* [EMAIL PROTECTED] *strLastName*
*/
*public* Person(String strFirstName, String strMiddleName, String
strLastName) {
*super*();
lstNames = *new* ArrayList<String>();
lstNames.add(strFirstName);
lstNames.add(strMiddleName);
*lstNames*.add(strLastName);
}
*public* *synchronized* *final* String getName(*int* piPosition){
*return* lstNames.get(piPosition);
}
*public* String toString(){
*return* lstNames.get(0) + " " +
lstNames.get(1) + " " +
lstNames.get(2) + " ";
}
}
}
---
However that givesme a traceback of :
org.apache.commons.jxpath.JXPathException: Cannot invoke null;
java.lang.NullPointerException
at org.apache.commons.jxpath.functions.MethodFunction.invoke(
MethodFunction.java:94)
at org.apache.commons.jxpath.ri.compiler.ExtensionFunction.computeValue(
ExtensionFunction.java:92)
at org.apache.commons.jxpath.ri.JXPathContextReferenceImpl.getValue(
JXPathContextReferenceImpl.java:314)
at org.apache.commons.jxpath.ri.JXPathContextReferenceImpl.getValue(
JXPathContextReferenceImpl.java:280)
at
com.ziath.eventregistration.email.test.JXPathTestCase.testJXPathDirectCall(
JXPathTestCase.java:24)
The thing is that I'm searching and searching for an example of how to do
this but not getting anywhere. Standard XPath (from W3C) notation (as far
as I can find) doesn't have this notion, the JXPath docs have an example
usaing a varibale but no example of how this variable is declared. The
other thing I've tried (as you can see above) is to get a pointer and use
this to make a relative context and call 'getPerson(., 1)' but that doesn't
work either.
Errm, I gonna try the nightly build to see if that has anything in it.
Any suggestions would be greatly appreciated!
Cheers,
Neil
On 3/5/07, Dmitri Plotnikov <[EMAIL PROTECTED]> wrote:
Neil,
In any case, please make sure that the syntax is right. You cannot use a
method as a step in the path. It must be called as a function:
"getQuestion(.[1], 'lastname')"
Regards,
- Dmitri
----- Original Message -----
From: "Scott Heaberlin" <[EMAIL PROTECTED]>
To: "Jakarta Commons Users List" <[email protected]>
Sent: Sunday, March 04, 2007 9:05 PM
Subject: Re: Calling a method with JXPath
Odd. I know I've used instance methods in JXPath before. But I can't
say I tried to do so where the instance method was on a member item of
a collection.
One thing I can say is that I've had difficulties in the past with the
1.2 release where my object graphs contain a mixture of maps,
collections, and pojos.
Suggestion - try your test case with one of the JXPath nightly builds.
I had to do that because some fixes for traversing collections of
collections which contain maps, etc. The 1.2 release is quite old.
-Scott Heaberlin
On 3/4/07, Neil Benn <[EMAIL PROTECTED]> wrote:
> Hello,
>
> Thanks for the tip - I tried that but unfortunatly it does not
work,
> I
> still get the same problem. The stack trace is now:
>
> ---
>
> org.apache.commons.jxpath.JXPathException: Invalid XPath:
> '.[1]/getQuestion(.[1], \'lastname\')'. Syntax error after: '.[1]/g'
>
> org.apache.commons.jxpath.ri.Parser.parseExpression(Parser.java:60)
>
org.apache.commons.jxpath.ri.JXPathContextReferenceImpl.compileExpression(
JXPathContextReferenceImpl.java:218)
> org.apache.commons.jxpath.ri.JXPathContextReferenceImpl.getValue(
JXPathContextReferenceImpl.java:247)
>
> ---
>
> It is the same problem. Interestingly I did try putting a list into
the
> JXContext and calling size as follows:
>
> List objValues = new ArrayList<String>();
> objValues.add("test1");
> objValues.add("test2");
> JXPathContext objContext = JXPathContext.newContext(objValues);
> System.out.println(objContext.getValue("size(.)"));
> assertEquals("test1", objContext.getValue(".[1]"));
>
> This works, it prints out 2 for the size of the list. I wonder if it
is
> because the method I am calling has parameters? In the meantime, I'm
> gonna
> trawl trhough the testcases in the source to see if I can find an
example.
>
> Thanks for your assistance.
>
> Cheers,
>
> Neil
>
> "Scott Heaberlin" <[EMAIL PROTECTED]> wrote:
>
> > Try passing the object on which you want to call the method as the
> > first arg in the xpath function (the object's method).
> >
> > .[1]/getQuestion(.[1], 'lastname')
> >
> > Object methods take the syntax above as part of JXPath's standard
> > extension functions.
> >
> >
>
http://jakarta.apache.org/commons/jxpath/users-guide.html#Standard_Extension_Functions
> >
> > Hope this helps,
> >
> > -Scott Heaberlin
> >
> > On 3/3/07, Neil Benn <[EMAIL PROTECTED]> wrote:
> > > Hello,
> > >
> > >
> > >
> > > I have a a strane problem when I'm trying to call a
method
> with
> > > JXPath. The object graph has a user which has a method called
> > > getQuestion(String pstrQuestionID). The JXPath I have written for
> > > this
> is:
> > >
> > >
> > >
> > > .[1]/getQuestion(\'lastname\')
> > >
> > >
> > > The dot at the front is notation to allow me to access
the
> first
> > > element, the root of the context is a list. However when I attempt
to
> > > run
> > > this I get the following stack trace :
> > >
> > >
> > >
> > > org.apache.commons.jxpath.JXPathException: Invalid XPath:
> > > '.[1]/getQuestion(\'lastname\')'. Syntax error after: '.[1]/g'
> > > org.apache.commons.jxpath.ri.Parser.parseExpression(Parser.java:60)
> > >
> >
>
org.apache.commons.jxpath.ri.JXPathContextReferenceImpl.compileExpression(
JXPathContextReferenceImpl.java:218)
> > >
> >
> org.apache.commons.jxpath.ri.JXPathContextReferenceImpl.getValue(
JXPathContextReferenceImpl.java:247)
> > >
> > >
> > > However as far as I can see, the XPath notation is valid
–
> > > I
> > would
> > > be most grateful is someone could let me know what I've done wrong.
> > >
> > >
> > >
> > > Thanks, in advance for your help.
> > >
> > >
> > >
> > > Cheers,
> > >
> > >
> > >
> > > Neil
> > >
> > >
> > >
> > > ---
> > >
> > > Neil Benn Msc
> > >
> > > CEO Ziath Ltd
> > >
> > > Website - http://www.ziath.com
> > >
> > > Blog - http://labauto-lounge.com
> > >
> > >
> > >
> > >
> > >
> > >
> > >
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> > >
> > >
> >
> > ---------------------------------------------------------------------
> > To unsubscribe, e-mail: [EMAIL PROTECTED]
> > For additional commands, e-mail: [EMAIL PROTECTED]
> >
> >
> ---
>
> Neil Benn Msc
> CEO Ziath Ltd
> Website - http://www.ziath.com
> Blog - http://labauto-lounge.com
>
>
>
>
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>
>
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