NO_MODIFICATION_ALLOWED_ERR

[Rick Rivello <ri...@nist.gov>]

All

I am trying to write a simple program that will throw the
NO_MODIFICATION_ALLOWED_ERR DOMException.

I get the lastChild node of an element which is readonly and use
the setNodeValue() to set the value.  I think
this should throw a NO_MODIFICATION_ALLOWED_ERR
since the node is readonly.


*********************************************
Below is a copy of  nodetest.java, staff.xml, st.dtd and the output created.
I am running xerces-1_3_0

Thanks in advance for any help or suggestions.

Rick Rivello


Contents of nodetest.java
**********************************************
import org.w3c.dom.*;
import org.w3c.dom.Node;

import org.apache.xerces.parsers.*;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;
import org.xml.sax.SAXParseException;

import java.io.*;
import java.net.*;


public class nodetest {

public static Document doc = null;  // Initialize doc

static final short NO_MODIFICATION_ALLOWED_ERR = 7;

public static void main(String argv[]) {

    try {
       org.apache.xerces.parsers.DOMParser parser = new
org.apache.xerces.parsers.DOMParser();
       parser.setFeature("http://xml.org/sax/features/validation", true);
       parser.setFeature("http://apache.org/xml/features/dom/defer-node-expansion",
false);

parser.setFeature("http://apache.org/xml/features/dom/include-ignorable-whitespace",
true);
       parser.parse("staff.xml");
       doc =  parser.getDocument();
    }
    catch (SAXException se) {
       se.printStackTrace(System.err);
    }
    catch (IOException ioe) {
       ioe.printStackTrace(System.err);
    }

// Retrieve targeted data

   try

        NodeList elementList = doc.getElementsByTagName("employeeId");
        Node lchildNode = elementList.item(0).getLastChild();

        System.out.println(lchildNode.getNodeName());
        System.out.println(lchildNode.getNodeType());
        System.out.println(lchildNode.getNodeValue());

        try

             lchildNode.setNodeValue("newvalue");
        }
        catch(DOMException e) {
             if (e.code == NO_MODIFICATION_ALLOWED_ERR)
                System.out.println("NO_MODIFICATION_ALLOWED_ERR");
             else
                System.out.println(String.valueOf(e.code));
        }
        System.out.println(String.valueOf(lchildNode.getNodeValue()));
   }
   catch (Exception e) {
        System.out.println("ABORTED DUE TO ERROR");
   }
}
}
************************************************


Contents of staff.xml
************************************************

<?xml version="1.0"?><?TEST-STYLE PIDATA?>
<!DOCTYPE staff SYSTEM "st.dtd" [
   <!ENTITY ent2 "1900 Dallas Road">
]>
<!-- This is comment number 1.-->
<staff>
 <employee>
  <employeeId>EMP0001</employeeId>
  <name>Margaret Martin</name>
  <position>Accountant</position>
  <salary>56,000</salary>
  <gender>Female</gender>
  <address domestic="Yes">1230 North Ave. Dallas, Texas 98551</address>
 </employee>
</staff>
*******************************************


Contents of st.dtd
*******************************************
<!ELEMENT employeeId (#PCDATA)>
<!ELEMENT name (#PCDATA)>
<!ELEMENT position (#PCDATA)>
<!ELEMENT salary (#PCDATA)>
<!ELEMENT gender (#PCDATA)>
<!ELEMENT address (#PCDATA)>
<!ELEMENT entElement (#PCDATA)>
<!ELEMENT employee (employeeId, name, position, salary, gender, address) >
<!ELEMENT staff (employee)+>
*******************************************
Output of running nodetest.java is:

#text
3
EMP0001
newvalue





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Re: NO_MODIFICATION_ALLOWED_ERR

[Arnaud Le Hors <le...@us.ibm.com>]

Which node do you think is readonly?
In any case, your program is modifying the Text node which is child of
the Element node "employeeId" and contains "EMP0001". It is not
readonly, so what you're seeing is normal.
-- 
Arnaud  Le Hors - IBM Cupertino, XML Strategy Group

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