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JDOM - Wrapping text/xml with CDATA

Posted on 2012-08-16
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Last Modified: 2012-10-04
I am trying to wrap a String with CDATA tags, however the input string could contain ']]>', if so then i get the following Exception :

The data "This is a]]> test" is not legal for a JDOM CDATA section: CDATA cannot internally contain a CDATA ending delimiter (]]>).

Is there an easy way I can get around this ? I want to ensure my input string is always wrapped in CDATA. I thought about replaing all occurances of ']]>' with say '£££' and then replacing then replacing the ']]>' afterwards ?

Any help would be gratefully received....thanks

Here is my code :

import org.jdom2.CDATA;
import org.jdom2.Document;
import org.jdom2.Element;
import org.jdom2.input.SAXBuilder;
import org.jdom2.output.Format;
import org.jdom2.output.XMLOutputter;

public class Wrapper {

	public static void main(String args[]) throws Exception {

		// String pString = "This is a test";
		String pString = "This is a]]> test";

		Wrapper wrapper = new Wrapper();

		Document doc = wrapper.wrapWithCdata(pString);

	}

	protected Document wrapWithCdata(String pString) throws Exception {

		Document doc = null;
		String xml = "<root></root>";

		try {
			doc = new SAXBuilder().build(new StringReader(xml));
			Element root = doc.getRootElement();
			root.addContent(new CDATA(pString));

			XMLOutputter outputter = new XMLOutputter(Format.getPrettyFormat());
			outputter.output(doc, System.out);

		} catch (Exception e) {
			System.out.println(e.getMessage());
		}

		return doc;
	}

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Question by:Molko
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Expert Comment

by:CEHJ
ID: 38301778
however the input string could contain ']]>',

That's quite a coincidence ;) Why can it?
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Author Comment

by:Molko
ID: 38301823
ha !...Yes a coincidence...

Well the String is actually badly formed html/xml document....
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CEHJ earned 2000 total points
ID: 38301994
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Author Comment

by:Molko
ID: 38302056
Thanks for the link

A CDATA section cannot contain the string "]]>" and therefore it is not possible for a CDATA section to contain nested CDATA sections.    That does not sound promising.


This means that to encode "]]>" in the middle of a CDATA section, replace all occurrences of "]]>" with the following:

]]]]><![CDATA[>

Does that mean i would have 2 (or more) CDATA ?....
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LVL 86

Expert Comment

by:CEHJ
ID: 38302087
Yes
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Author Comment

by:Molko
ID: 38302148
hmmm. I'll need to have a think then, becuase I run some regExp over the Document (which is essentially the String wrapped in CDATA encased in <root><root> via an XSLT....I'm hoping the extra CDATA wont get in the way ?

Given the code i showed above, whats the best way to issue the replace("]]>", "]]]]><![CDATA[>")  ?

I've found it akwards issuing the replace() statement...I did intend to do something similar by replace ]]> with £££ but found I had to create the JDOM structure twice.

Thanks
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Author Closing Comment

by:Molko
ID: 38464541
Thanks
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