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XmlElement CDATA section [message #814562]

Tue, 06 March 2012 15:50

Greg Amerson

Messages: 119
Registered: March 2010

Senior Member

Hey everyone,

I have an xml file where I have a json String that is embedded in a xml element, like

<metadata>
   <![CDATA[{"xy":[50,50]}]]>
</metadata>

So what I'm currently doing is creating a ElementBindingImpl that will grab the XmlElement and read the contents of the CDATA section. Reading works fine, but the problem I'm having is when there is not a <metadata> element and I have to create one and then add a CDATA section. Is it possible to create a CDATA child node for a XmlElement

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Re: XmlElement CDATA section [message #814775 is a reply to message #814562]

Tue, 06 March 2012 22:00

Konstantin Komissarchik

Messages: 1077
Registered: July 2009

Senior Member

You would have to get the DOM node from the XmlElement convenience wrapper and use DOM API to create the CDATA section. Something like this:

XmlElement el = ...
Element domel = el.getDomNode();
CDATASection cdata = domel.getDocument().createCDATASection( "..." );
domel.insertBefore( cdata, null );

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Re: XmlElement CDATA section [message #814895 is a reply to message #814775]

Wed, 07 March 2012 01:27

Greg Amerson

Messages: 119
Registered: March 2010

Senior Member

Easy enough, thanks!

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Re: XmlElement CDATA section [message #1062726 is a reply to message #814895]

Mon, 10 June 2013 14:09

kon f

Messages: 152
Registered: March 2012

Senior Member

Could you please share your solution? I'm not sure where to place this wrapper code. Unfortunately, I couldn't find any CDATA example in the sample project. Thank you!

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Re: XmlElement CDATA section [message #1063022 is a reply to message #1062726]

Tue, 11 June 2013 20:00

Konstantin Komissarchik

Messages: 1077
Registered: July 2009

Senior Member

To bind to CDATA, you will need to implement XmlValueBindingImpl and use @CustomXmlValueBinding to attach it to the property. Take a look at the XmlValueBindingImpl API. The methods that you need to implement are read() and write(). Use xml() method to get a handle on XmlElement. Then see the code snippet shown previously for how to get access to DOM and manipulate CDATA nodes. See DOM API for more details on handling CDATA.

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Re: XmlElement CDATA section [message #1063118 is a reply to message #1063022]

Wed, 12 June 2013 11:50

kon f

Messages: 152
Registered: March 2012

Senior Member

Hey Konstantin,

thank you for the information. Here is my solution if anyone else should have the same issue.

import org.eclipse.sapphire.modeling.xml.XmlElement;
import org.eclipse.sapphire.modeling.xml.XmlValueBindingImpl;
import org.w3c.dom.Element;
import org.w3c.dom.Node;

public class CDataXmlValueBindingImpl extends XmlValueBindingImpl {

    @Override
    public String read() {
        return xml(false).getText();
    }

    @Override
    public void write(String value) {
        XmlElement el = xml(false);
        Element domel = el.getDomNode();
        this.removeAllChildren(domel);
        Node newNode = getNode(value, domel);
        domel.insertBefore(newNode, null);
    }

    private void removeAllChildren(Element domel) {
        while (domel.hasChildNodes()) {
            domel.removeChild(domel.getFirstChild());
        }
    }

    private Node getNode(String value, Element domel) {
        if (!value.isEmpty()) {
            return domel.getOwnerDocument().createCDATASection(value);
        }

        return domel.getOwnerDocument().createTextNode(value);
    }
}

And here the property annotation:

...
@CustomXmlValueBinding(impl = CDataXmlValueBindingImpl.class)
ValueProperty PROP_SOURCE_CODE = new ValueProperty(TYPE, "SourceCode");
...

Thank you!

Kon

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