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package com.googlecode.gwt.test.internal.utils;

import java.util.ArrayList;
import java.util.List;

import org.xml.sax.Attributes;
import org.xml.sax.ContentHandler;
import org.xml.sax.Locator;
import org.xml.sax.SAXException;

import com.google.gwt.dom.client.Document;
import com.google.gwt.dom.client.Element;
import com.google.gwt.dom.client.Node;
import com.google.gwt.dom.client.NodeList;
import com.google.gwt.dom.client.Text;

/**
 * SAX handler for GWT DOM parsing. For internal use only.
 * 
 * @author Gael Lazzari
 * 
 */
class GwtHtmlContentHandler implements ContentHandler {

   private Node currentNode;

   private final List nodes = new ArrayList();

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

      String string = String.valueOf(ch, start, length).replaceAll("\\u00A0", " ");

      if (string.length() > 0) {
         Text text = Document.get().createTextNode(string);

         if (currentNode != null) {
            currentNode.appendChild(text);
         } else {
            // root text node
            nodes.add(text);
         }
      }
   }

   public void endDocument() throws SAXException {
   }

   public void endElement(String nameSpaceURI, String localName, String rawName)
            throws SAXException {
      currentNode = currentNode.getParentNode();
   }

   public void endPrefixMapping(String prefix) throws SAXException {
   }

   public NodeList getParsedNodes() {
      return JsoUtils.newNodeList(nodes);
   }

   public void ignorableWhitespace(char[] ch, int start, int end) throws SAXException {
   }

   public void processingInstruction(String target, String data) throws SAXException {
   }

   public void setDocumentLocator(Locator locator) {
   }

   public void skippedEntity(String arg0) throws SAXException {
   }

   public void startDocument() throws SAXException {
   }

   public void startElement(String nameSpaceURI, String localName, String rawName,
            Attributes attributes) throws SAXException {

      Element element = Document.get().createElement(localName);

      if (currentNode != null) {
         currentNode.appendChild(element);
      } else {
         // root node
         nodes.add(element);
      }
      currentNode = element;

      for (int index = 0; index < attributes.getLength(); index++) {
         String attrName = attributes.getLocalName(index);
         String attrValue = attributes.getValue(index);

         if ("style".equalsIgnoreCase(attrName)) {
            GwtStyleUtils.overrideStyle(element.getStyle(), attrValue);
         } else if ("class".equalsIgnoreCase(attrName)) {
            element.setClassName(attrValue);
         } else {
            element.setAttribute(attrName, attrValue);

         }
      }
   }

   public void startPrefixMapping(String prefix, String URI) throws SAXException {
   }
}