DZone Snippets: Mwaschkowski's Code Snippets

gwt event handling example (for event handling not taken care of specifically)

mwaschkowski (Mark Waschkowski) — Wed, 18 Jun 2008 18:27:15 GMT

// description of your code here
Code below should be used to listen to any event not already covered in API



     sinkEvents(Event.MOUSEEVENTS);

    public void onBrowserEvent(Widget sender, Event event)

    {

        if ((DOM.eventGetButton(event) == Event.BUTTON_RIGHT) &&

            (DOM.eventGetType(event) == Event.ONMOUSEDOWN))

        { 

         ...

flex 3 combo box code

mwaschkowski (Mark Waschkowski) — Wed, 11 Jun 2008 15:47:51 GMT

// description of your code here
Easiest way to populate a combo box.



var valueArray:Array = new Array();

          var emptyItem:Object = new Object();

          emptyItem.data = "";

          emptyItem.label = "";

          var buildingItem:Object = new Object();

          buildingItem.data = "building";

          buildingItem.label = "Building";

          var regionItem:Object = new Object();

          regionItem.data = "region";

          regionItem.label = "Region"        

          valueArray.push(emptyItem);

          valueArray.push(buildingItem);

          valueArray.push(regionItem);          

          

          filterComboBox = new ComboBox();

          filterComboBox.dataProvider = valueArray;

          filterComboBox.addEventListener(ListEvent.CHANGE, filterUpdate);

xml parsing using content handler

mwaschkowski (Mark Waschkowski) — Tue, 30 Oct 2007 18:04:26 GMT

// description of your code here
given an xml:





	managePermissions

	

		

			role1

			role2

			role3

		

		

			roleA

			roleB

		

	

	

		xyz

will parse into permission map



static Map> getPermissionMap(String xml){

    final Map> permissionMap = new HashMap>();

    

    //handler will produce a permission map based on xml

    ContentHandler allowDenyXmlHandler = new DefaultHandler() {

      private String permissionType;

      private List roleList = new ArrayList();

      private Stack nodes = new Stack();

      private StringBuilder roleBuffer = new StringBuilder();

      

      /**

       * Get type of permission that is defined in type attribute

       */

      public void startElement(String uri, String localName, String qName, Attributes attributes) throws SAXException {

        nodes.push(qName.trim());

        //get type of permission

        if(nodes.peek().equals(PERMISSION)){

          permissionType = attributes.getValue(PERMISSION_TYPE);

        }

      }



      /**

       * Get role data for specified role

       */

      public void characters(char ch[], int start, int length) throws SAXException {

        if(nodes.peek().equals(ROLE)){

          roleBuffer.append(ch, start, length);  

        }

      }



      /**

       * Populate role list if role end tag, or populate permission map if permission end tag

       */

      public void endElement(String uri, String localName, String qName) throws SAXException {

        String nodeName = nodes.pop();

        if(nodeName.equals(ROLE)){

          roleList.add(roleBuffer.toString());

          roleBuffer.setLength(0);  

        }else if(nodeName.equals(PERMISSION)){

          List tempList = new ArrayList();

          tempList.addAll(roleList);

          permissionMap.put(permissionType, tempList);

          roleList.clear();

        }

      }



      public void endDocument() throws SAXException {

        // sanity check

        if (nodes.size() > 0) logger.error("Node stack is not empty !!!");

      }

    };

    

    try {

      SAXParser parser = null;

      // get SAXParser

      synchronized (XMLParserHelper.saxParserFactory) {

        parser = XMLParserHelper.saxParserFactory.newSAXParser();

      }

      // Set custom content handler

      parser.getXMLReader().setContentHandler(allowDenyXmlHandler);

      // parse xml

      parser.getXMLReader().parse(new InputSource(new StringReader(xml)));



    } catch (Exception e) {

      logger.error("[DLA00002] Unable to process permissions from XML {" + xml + "}", e);

    }

    

    return permissionMap;

  }