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Hot Topic (More than 10 Replies) problem with  flowChart.saveToXml(doc)   (Read 10667 times)
jay
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problem with  flowChart.saveToXml(doc)  
Feb 10th, 2009 at 5:14am
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Hi,

   I am trying to save graph in Document using saveToXml().  My code look like

DocumentBuilderFactory   fact;
DocumentBuilder   bd ;
Document  doc;

try {
fact = DocumentBuilderFactory.newInstance();
       bd = fact.newDocumentBuilder();
doc = bd.newDocument(); 
}catch (ParserConfigurationException e){
   e.printStackTrace();
}

on a button click I am trying following;
diag.saveToXml(doc);

Now I am trying to print doc.toString() but it shows following string;
[#document: null]

I want the graph xml file for process purpose.
Where I am going wrong ?

Thank you
  
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jay
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Re: problem with  flowChart.saveToXml(doc) &n
Reply #1 - Feb 10th, 2009 at 9:39am
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Hi,

   I need this to be solved soon, can you please suggest what to do ?
  
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Stoyo
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Re: problem with  flowChart.saveToXml(doc)  
Reply #2 - Feb 10th, 2009 at 10:03am
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Can you see any exceptions printed in the console?
  
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jay
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Re: problem with  flowChart.saveToXml(doc) &n
Reply #3 - Feb 10th, 2009 at 10:17am
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hi ,


    No exceptions, The doc.toString() prints following
[#document: null]
  
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Re: problem with  flowChart.saveToXml(doc)  
Reply #4 - Feb 10th, 2009 at 10:57am
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This is how JDiagram saves XML files:

Code
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// in the saveToXml(stream) method:
DocumentBuilder builder = XmlDom.createBuilder();
Document document = builder.newDocument();
saveToXml(document, includeUnalteredProperties);
XmlDom.saveDOM(document, new StreamResult(new OutputStreamWriter(stream, "UTF-16")));

the XmlDom.createBuilder method:
static DocumentBuilder createBuilder()
	throws XmlException
{
	try
	{
		DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
		factory.setValidating(false);
		factory.setNamespaceAware(false);
		return factory.newDocumentBuilder();
	}
	catch (ParserConfigurationException ex)
	{
		throw new XmlException(ex);
	}
}


Try using the same xml properties in your code.

I hope that helps,
Stoyan
  
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Re: problem with  flowChart.saveToXml(doc) &n
Reply #5 - Feb 10th, 2009 at 1:35pm
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Hi,

I have tried with the same properties you have mentioned, then also same thing is happening.
  
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Re: problem with  flowChart.saveToXml(doc)  
Reply #6 - Feb 10th, 2009 at 2:06pm
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Are you sure doc.toString() should display anything different? I don't think it will return the XML markup for the whole document.
  
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Re: problem with  flowChart.saveToXml(doc) &n
Reply #7 - Feb 11th, 2009 at 5:23am
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Hi,


   I am checking doc == null after   diag.saveToXml(doc); and found that it is null.

It means some thing is going wrong in saveToXml(doc) as XML dom is not saved in doc.

  
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Re: problem with  flowChart.saveToXml(doc)  
Reply #8 - Feb 11th, 2009 at 9:27am
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There is no way for saveToXml to change its doc argument to null. More likely the doc variable is null even before that. Are you sure the code that instantiates the doc object has executed at the time your button click handler runs?
  
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Re: problem with  flowChart.saveToXml(doc) &n
Reply #9 - Feb 11th, 2009 at 10:05am
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Hi,
   
   What i got from diag.saveToXml(document); method is that it takes a Document doc argument and saves graph in doc as DOM.

   I am doing simple thing as i had mentioned previously like creating a Document instance as following,
   
DocumentBuilderFactory  fact = DocumentBuilderFactory.newInstance();
   fact.setValidating(false);
   fact.setNamespaceAware(false);
DocumentBuilder bd = fact.newDocumentBuilder();
Document doc = bd.newDocument();

and now saving diagram DOM in it as following

diag.saveToXml(doc);

but processing doc shows its null. How?

What is going wrong I am not getting ?
  
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Re: problem with  flowChart.saveToXml(doc)  
Reply #10 - Feb 11th, 2009 at 10:51am
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Is the doc variable null, just after calling bd.newDocument()? That is, comparing doc == null returns true?
  
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Re: problem with  flowChart.saveToXml(doc) &n
Reply #11 - Feb 11th, 2009 at 11:00am
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hi,

   what  diag.saveToXml(doc); doing then
I am checking doc after diag.saveToXml(doc); statement.  So there should be xml dom in doc.
  
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Re: problem with  flowChart.saveToXml(doc)  
Reply #12 - Feb 11th, 2009 at 11:20am
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Why have you decided there aren't any elements in the document? Use the XML API to check if there is anything there, instead of just calling toString(). Document.toString() might be the default implementation from Object, and would not return the full XML markup in that case.
  
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Re: problem with  flowChart.saveToXml(doc) &n
Reply #13 - Feb 11th, 2009 at 12:01pm
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Hi,
   Ohh.. sorry I had not mentioned but i have also checked it using following ;
doc.hasChildNodes()
doc.getFirstChild()

   But it shows same thing.
  
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jay
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Re: problem with  flowChart.saveToXml(doc) &n
Reply #14 - Feb 11th, 2009 at 12:27pm
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Hi,

  One more thing that following works well,
  diag.saveToXml("c:\\temp.xml");
  
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