[oXygen-user] DocumentTypeCustomRuleMatcher that depends on document child element

[Oxygen XML Editor Support]

Hi Benoît,

Basically Oxygen tries to detect the document type without parsing the 
entire file, just by looking at the root element (or before the root 
element, at the document type).

But one of the parameters in the interface is "systemID". This is the 
URL which corresponds to the XML file which is about to be opened.
So what you could try to do would be to create a SAX Parser over that 
systemID and check for that particular XML element, something like:

> /**
>  * Match XML files which have the <proced> element inside a <content> element
>  */
> public class ProcedCustomRuleMatcher implements DocumentTypeCustomRuleMatcher {
>
>   private boolean matches = false;
>   private Stack<String> elements = new Stack<String>();
>   /**
>    * Try to find a <code>DITAArchVersion</code> attribute in the root attributes.
>    *
>    * @see ro.sync.ecss.extensions.api.DocumentTypeCustomRuleMatcher#matches(java.lang.String, java.lang.String, java.lang.String, java.lang.String, org.xml.sax.Attributes)
>    */
>   public boolean matches(String systemID, String rootNamespace, String rootLocalName,
>       String doctypePublicID, Attributes rootAttributes) {
>     matches = false;
>     try {
>       SAXParserFactory.newInstance().newSAXParser().parse(new InputSource(systemID), new DefaultHandler() {
>         /**
>          * @see org.xml.sax.helpers.DefaultHandler#startElement(java.lang.String, java.lang.String, java.lang.String, org.xml.sax.Attributes)
>          */
>         @Override
>         public void startElement(String uri, String localName, String qName, Attributes attributes)
>             throws SAXException {
>           if("proced".equals(localName)) {
>             if("content".equals(elements.peek())) {
>               matches = true;
>               //Break the entire parsing early
>               throw new SAXParseException("BROKEN", null);
>             }
>           }
>           elements.push(localName);
>         }
>         /**
>          * @see org.xml.sax.helpers.DefaultHandler#endElement(java.lang.String, java.lang.String, java.lang.String)
>          */
>         @Override
>         public void endElement(String uri, String localName, String qName) throws SAXException {
>           elements.pop();
>         }
>       });
>     } catch (SAXException e) {
>       e.printStackTrace();
>     } catch (IOException e) {
>       e.printStackTrace();
>     } catch (ParserConfigurationException e) {
>       e.printStackTrace();
>     }
>     return matches;
>   }
>   /**
>    * @see ro.sync.ecss.extensions.api.Extension#getDescription()
>    */
>   @Override
>   public String getDescription() {
>     return "Match XML files which have the <proced> element inside a <content> element";
>   }
> }

You should also probably have a fallback document type which is matched 
by the XML file even if it does not contain one of those searched XML 
elements.

Regards,
Radu

Radu Coravu
<oXygen/>  XML Editor, Schema Editor and XSLT Editor/Debugger
http://www.oxygenxml.com

On 4/10/2012 6:13 PM, Benoit CHERY wrote:
> Hi,
>
> I'd like to switch document type depending on an xpath. I thought
> DocumentTypeCustomRuleMatcher would do it, but it seems it doesn't
> because it only has 5 parameters (which i don't care about) in matches
> method.
>
> My documents look like this :
> <doc>
> <status/>
> <content>
> <!-- element here could be either 'proced' or 'desc' -->
> </content>
> </doc>
>
> I want to apply different css, schema, toolbar depending on the 'proced'
> or 'desc' element, is it possible?
> I can't change my document structure because it's normalized.
>
> Thanks for all.
> Benoît.
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