[
http://issues.apache.org/jira/browse/XALANJ-2296?page=comments#action_12377406
]
Ravindra Nandal commented on XALANJ-2296:
-----------------------------------------
Following to my above bug report...
Here is a program that might give you a little idea what I am trying to do...
----------------------------------------------------------------------------------------------------------------------
package test;
import java.io.FileReader;
import java.io.StringReader;
import java.io.StringWriter;
import java.io.Writer;
import javax.xml.transform.TransformerException;
import org.apache.xerces.parsers.DOMParser;
import org.apache.xerces.parsers.SAXParser;
import org.apache.xml.utils.PrefixResolver;
import org.apache.xpath.XPath;
import org.apache.xpath.XPathAPI;
import org.apache.xpath.XPathContext;
import org.apache.xpath.objects.XObject;
import org.w3c.dom.Attr;
import org.w3c.dom.DOMException;
import org.w3c.dom.Document;
import org.w3c.dom.DocumentType;
import org.w3c.dom.Element;
import org.w3c.dom.NamedNodeMap;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.xml.sax.InputSource;
/**
* @author nandalrx
*
* To change the template for this generated type comment go to
* Window>Preferences>Java>Code Generation>Code and Comments
*/
public class ElementAttributeTest
{
/**
* @param xPathString a String containing the Xpath of the element to be
* found
* @returns the corresponding Nodes as and array.
* Returns null if there is no such node
* @throws XPathException
* @throws DOMException
*/
public static XObject getNodesAsList(
PrefixResolver prefixResolver,
XPathContext xPathContext,
XPath xPath,
int ctxtNode)
throws TransformerException, DOMException
{
return xPath.execute(xPathContext, ctxtNode, prefixResolver);
}
/**
* @param args
* @throws Exception
*/
public static void main(String[] args) throws Exception
{
DOMParser domParser = new DOMParser();
SAXParser saxParser = new SAXParser();
InputSource is = new InputSource(new FileReader(args[0]));
domParser.parse(is);
/*Get the document to be modified...*/
Document document = domParser.getDocument();
/* get the parent node to be inserted with new child node...*/
Node node = XPathAPI.selectSingleNode(document, args[1]);
/* Create an element to be inserted... */
Element t_n = document.createElement("lndocmeta:smi");
Attr atr = document.createAttribute("lnsmi");
t_n.setAttribute("lnsmi", "ravi");
Node fc = node.getFirstChild();
fc = fc.getNextSibling();
fc = fc.getNextSibling();
/*inserting new element...*/
node.insertBefore(t_n, fc);
/*This is just for self verification of the modified DOM object...*/
String processedString =
convertDOMToString(document, new StringWriter(), "xxx");
// System.out.println(processedString);
/* if I un comment below lines... it works fine... */
// is = new InputSource(new StringReader(processedString));
// domParser.parse(is);
/* This way it finds the element added... */
NodeList list = document.getElementsByTagName("lndocmeta:smi");
//Node smi = XPathAPI.selectSingleNode(document,
"/*/lndocmeta:docinfo/lndocmeta:smi");
for(int i = 0; i < list.getLength(); i++)
{
Node n1 = list.item(i);
System.out.println(n1.getNodeName());
NamedNodeMap nnm = n1.getAttributes();
for(int j = 0; j < nnm.getLength(); j++)
{
Node n2 = nnm.item(j);
System.out.println(n2.getNodeName() + " : " + n2.getNodeValue());
}
}
/* it find the an element that is around an element added... and I can traverse
to element added to...*/
Node smi = XPathAPI.selectSingleNode(document,
"/*/lndocmeta:docinfo/lndocmeta:lnlni");
if(smi != null)
{
System.out.println(smi.getNodeName());
smi = smi.getNextSibling();
System.out.println(smi.getNodeName());
}
/* Here it sucks it does not find the new element added in the Modified DOM
document object... it returns null... don't know why???
I personally think it is a bug...*/
smi = XPathAPI.selectSingleNode(document, "/*/lndocmeta:docinfo/lndocmeta:smi");
if(smi != null)
{
System.out.println("++++++ " + smi.getNodeName());
}
}
}
----------------------------------------------------------------------------------------------------------------------
Thanks,
> XPath API's does not recognize or find an element added in DOM object runtime.
> ------------------------------------------------------------------------------
>
> Key: XALANJ-2296
> URL: http://issues.apache.org/jira/browse/XALANJ-2296
> Project: XalanJ2
> Type: Bug
> Components: DTM, parse-or-compile, XPath, XPath-API
> Versions: 2.4
> Environment: any [XP, Linux... never tried on Solaris, But I think it might
> be true for solaris also]
> Reporter: Ravindra Nandal
>
> I apologize for if I am making any mistake creating this bug...
> Here it goes...
> In our program we read an XML document from file and parse(DOM Parser)
> against the DTD. We get the DOM Document object using parser to modify the
> document, in this case we are adding new element at particular place in the
> document, we are using XPath to search through the position where new element
> to be inserted or added to. In the same program in another place it tries to
> find the new element using XPath expression against the same DOM document
> that has been modified above by XPath Evaluator API's, it does not find but
> if you look in the document object the new element is there. I can find the
> new element by normal DOM API like getElementByTagName() method... More over
> I can traverse through the new element by executing an XPath expression to an
> element that is around the new element. Again if I convert the modified DOM
> document into text string and parse again through parser to get the new DOM
> Document object... it works fine with new DOM document object...
> I am not sure if I am able to explain everything here... Please drop me an
> e-mail if you have any questions. I also not sure if this is a bug or there
> is way to around this problem.
> Please respond in either case.
> Thanks,
> - Ravi
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