OW_XMLParserDOM.cpp

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#include "OW_config.h"
#include "OW_XMLParserDOM.hpp"
#include "OW_XMLParserSAX.hpp"
#include "OW_XMLNode.hpp"
#include "OW_XMLParserCore.hpp" // for XMLToken
#include "OW_XMLParseException.hpp"
#include "OW_Format.hpp"
#include "OW_ExceptionIds.hpp"

namespace OW_NAMESPACE
{

OW_DEFINE_EXCEPTION_WITH_ID(DOM);

using std::istream;

namespace
{

class DOMDocumentBuilder : public XMLParserSAX::SAXDocumentHandler
{
public:
   virtual void endDocument()
   {
   }
   virtual void startElement(const XMLToken &entry)
   {
      XMLAttributeArray newAttrArray;
      unsigned int len = entry.attributeCount;
      for (unsigned int index = 0; index < len; index++)
      {
         String nodeName = entry.attributes[index].name.toString();
         String nodeValue = entry.attributes[index].value.toString();
   
         XMLAttribute newAttribute(nodeName, nodeValue);
         newAttrArray.append(newAttribute);
      }
   
      XMLNode newNode(entry.text.toString(), newAttrArray);
   
      if (newNode)
      {
         if (!m_topNode)
         {
            m_topNode = newNode;
         }
   
         // If there is anything in the array, this is the child of that last guy
         if (m_nodeArray.size() > 0)
         {
            XMLNode parent = m_nodeArray[m_nodeArray.size() - 1];
            parent.addChild(newNode);
         }
   
         m_nodeArray.push_back(newNode);
      }
   }
   
   // name is not unescaped (implementation has to do it if necessary)
   virtual void endElement(const StringBuffer &name)
   {
      // at the end of the element, we just need to pop a node
      // off the stack
      m_nodeArray.pop_back();
   }
   // chars is not unescaped (implementation has to do it if necessary)
   virtual void characters(const StringBuffer &chars)
   {
      if (m_nodeArray.size() > 0)
      {
         XMLNode curNode = m_nodeArray[m_nodeArray.size() - 1];
         if (curNode != 0)
         {
            String utxt = chars.toString();
            curNode.appendText(utxt);
         }
      }
   }
   virtual void startDocument()
   {
   }

   XMLNode getDocument() const
   {
      return m_topNode;
   }

private :
   
   XMLNode m_currentNode;
   XMLNode m_topNode;
   XMLNodeArray m_nodeArray;

};

class DOMErrorHandler : public XMLParserSAX::SAXErrorHandler
{
public:
   virtual void warning(const XMLParseException &exception)
   {
   }
   virtual void error(const XMLParseException &exception)
   {
      OW_THROW(DOMException, Format("Error in XML: "
               "line %1, Message: %3",
               exception.getLine(),
               exception.getMessage()).c_str());
   }
   virtual void fatalError(const XMLParseException &exception)
   {
      OW_THROW(DOMException, Format("Fatal error in XML: "
               "line %1, Message: %2",
               exception.getLine(),
               exception.getMessage()).c_str());
   }
};

} // end unnamed namespace

namespace XMLParserDOM
{

XMLNode 
parse(const String& xmlData)
{
   DOMDocumentBuilder docHandler;
   DOMErrorHandler errHandler;
   XMLParserSAX::parse(xmlData, docHandler, errHandler);
   XMLNode rv = docHandler.getDocument();
   if (!rv)
   {
      OW_THROW(DOMException, "No document found");
   }
   return rv;
}

XMLNode
parse(istream& data)
{
   DOMDocumentBuilder docHandler;
   DOMErrorHandler errHandler;
   XMLParserSAX::parse(data, docHandler, errHandler);
   XMLNode rv = docHandler.getDocument();
   if (!rv)
   {
      OW_THROW(DOMException, "No document found");
   }
   return rv;
}

} // end namespace XMLParserDOM
} // end namespace OW_NAMESPACE

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