Examples of de.danet.an.util.sax.HandlerStack

de.danet.an.util.sax.HandlerStack
HandlerStack provides support for dispatching SAX events to the appropriate target during processing of an XML document.
Writing an event handler for a SAX parser and being object oriented isn't easy. Most people tend to write one large event handler that knows far too much about the objects that it has to create and provide with information. According to the object oriented approach, every object should implement its own handling for the parts of the XML text that provides information about the object's state.
This means changing the parser's content handler in a controlled way. Each time that a handler encounters an element that denotes the start of another object, it should create another object and delegate further processing to this object. Or even better, it should call a (static) factory method for the class associated with the encountered element and leave all further processing to the factory method.
Effectively, this results in a stack of handler with events being delivered to the top of stack handler. This class implements such a stack with as much automation as possible.

   Map actSetDefs, String blkActId, 
   JoinAndSplitMode joinMode, JoinAndSplitMode splitMode)
  throws SAXException {
  super (key);
  allActs = new HashMap ();
  HandlerStack hs = new HandlerStack 
      (new BlockActivityInitializer 
       (proc, actSetDefs, blkActId, joinMode, splitMode));
  hs.setContextData ("packageId", packageId);
  actSetDef.emit(hs.contentHandler());
    }

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     */
    public void startElement (String namespaceURI, String localName,
            String qName, Attributes atts)
    throws SAXException {
        try {
            HandlerStack stack = getStack();
            SOAPEnvelope env = (SOAPEnvelope) stack.getContextData ("envelope");
            String prefix = stack.getPrefixForURI(namespaceURI);
            Name name = env.createName (localName, prefix, namespaceURI);
            SOAPElement parent = (SOAPElement)elemStack.get(0);
            SOAPElement current = null;
            if (parent instanceof SOAPBody) {
                current = ((SOAPBody)parent).addBodyElement (name);

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    }


    private void appendNodes 
    (SOAPEnvelope env, SOAPElement root, SAXEventBuffer data) 
    throws SAXException {
        HandlerStack hs = new HandlerStack (new SOAPBuilder (root));
        hs.setContextData ("envelope", env);
        data.emit(hs.contentHandler());
    }

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    /**
     * Simple parsing test
     */
    public void simpleParse() throws Exception {
  XMLReader reader = getReader();
  HandlerStack stack = new HandlerStack (reader, new StackedHandler());
  reader.parse 
      (new InputSource 
       (Sax.class.getResourceAsStream("/util/testXPDL.xml")));
    }

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      + "/{http://www.wfmc.org/2002/XPDL1.0}WorkflowProcess"
      + "/{http://www.wfmc.org/2002/XPDL1.0}Activities"
      + "/{http://www.wfmc.org/2002/XPDL1.0}Activity"
      + "/{http://www.wfmc.org/2002/XPDL1.0}TransitionRestrictions";
  XMLReader reader = getReader();
  HandlerStack stack = new HandlerStack 
      (reader, new StackedHandler() {
        public void startElement 
      (String uri, String localName, String qName,
       Attributes atts) throws SAXException {
      outerTags.add (qName);
      if (qName.equals ("TransitionRestrictions")) {
          assertTrue (currentPath().equals(expPath));
          getStack().push (new SubHandler());
      }
        }
    });
  stack.setContextData ("innerTags", innerTags);
  reader.parse 
      (new InputSource 
       (Sax.class.getResourceAsStream("/util/testXPDL.xml")));
  assertTrue (outerTags.contains ("Activity"));
  assertTrue (outerTags.contains ("TransitionRestrictions"));

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        super.startElement (uri, localName, qName, atts);
    }
      };
  dh.addHandler ("http://www.wfmc.org/2002/XPDL1.0",
           "TransitionRestrictions", SubHandler.class);
  HandlerStack stack = new HandlerStack (reader, dh);
  stack.setContextData ("innerTags", innerTags);
  reader.parse 
      (new InputSource 
       (Sax.class.getResourceAsStream("/util/testXPDL.xml")));
  assertTrue (outerTags.contains ("Activity"));
  assertTrue (outerTags.contains ("TransitionRestrictions"));

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      };
  dh.addHandler 
      ("{http://www.wfmc.org/2002/XPDL1.0}Activity"
       + "/{http://www.wfmc.org/2002/XPDL1.0}TransitionRestrictions",
       SubHandler.class);
  HandlerStack stack = new HandlerStack (reader, dh);
  stack.setContextData ("innerTags", innerTags);
  reader.parse 
      (new InputSource 
       (Sax.class.getResourceAsStream("/util/testXPDL.xml")));
  assertTrue (outerTags.contains ("Activity"));
  assertTrue (outerTags.contains ("TransitionRestrictions"));

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       + "/{http://www.wfmc.org/2002/XPDL1.0}WorkflowProcess"
       + "/{http://www.wfmc.org/2002/XPDL1.0}Activities"
       + "/{http://www.wfmc.org/2002/XPDL1.0}Activity"
       + "/{http://www.wfmc.org/2002/XPDL1.0}TransitionRestrictions",
       SubHandler.class);
  HandlerStack stack = new HandlerStack (reader, dh);
  stack.setContextData ("innerTags", innerTags);
  reader.parse 
      (new InputSource 
       (Sax.class.getResourceAsStream("/util/testXPDL.xml")));
  assertTrue (outerTags.contains ("Activity"));
  assertTrue (outerTags.contains ("TransitionRestrictions"));

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         DefaultParticipant.SAXInitializer.class);
      StackedHandler extAttrHandler = new SAXExtAttrHandler ();
      dh.addHandler (packagePath + extAttrRelPath, extAttrHandler);
      dh.addHandler (processPath + extAttrRelPath, extAttrHandler);
      applications = new HashMap ();
      HandlerStack hs = new HandlerStack (dh);
      procDef.emit(hs.contentHandler(), null);
      for (Iterator i = applications().iterator(); i.hasNext();) {
          ApplicationDefinition applDef 
              = (ApplicationDefinition)i.next();
                postfixApplicationDefinition(applDef);
      }

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    private void subtreeToSAX (Element e, ContentHandler h) {
  try {
      SAXEventBufferImpl buf = new SAXEventBufferImpl ();
      SAXOutputter out = new SAXOutputter (buf);
      out.output(new Document((Element)e.clone()));
      HandlerStack hs = new HandlerStack (h);
      buf.emit (hs.contentHandler());
  } catch (JDOMException ex) {
      throw new IllegalArgumentException (ex.getMessage ());
  } catch (SAXException ex) {
      throw new IllegalArgumentException (ex.getMessage ());
  }

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