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// This file contains the declaration of the ExpatHandlerNs class.

#ifndef KML_BASE_EXPAT_HANDLER_NS_H__
#define KML_BASE_EXPAT_HANDLER_NS_H__

#include "kml/base/expat_handler.h"
#include "kml/base/util.h"

namespace kmlbase {

class Xmlns;

// Interface to namespace-enabled expat parser.  Overall usages is as follows:
// Xmlns* xmlns = Xmlns::Create(xmlns-default-and-prefix-namespace-pairs);
// class YourExpatHandler : public ExpatHandler {
//  public:
//   StartElement(const char* your_prefixed_name, const char** atts) {
//     // your_prefixed_name is either:
//     //  1) "foo" if "foo" is in the default namespace of the Xmlns.
//     //  2) "yourprefix:goo" if "goo" is in a namespace for which there
//     //     is a mapping to "yourprefix" in the xmlns.
//     //  3) "whoknows:bar" if "bar" is in a namespace unknown to the Xmlns.
//   }
//   EndElement(const char* your_prefixed_name) {
//   }
//   CharData(const XML_Char* s, int len) {
//   }
// };
// YourExpatHandler your_expat_handler;
// ExpatHandlerNs expat_handler_ns(&your_expat_handler, xmlns);
// bool status = ExpatParser(xml_data, &expat_handler_ns, errors, true);
class ExpatHandlerNs : public ExpatHandler {
public:
  // The given ExpatHandler is a prefix-aware but namespace-unaware handler.
  // The Xmlns describes the prefixes implemented by the handler.  For example,
  // if the ExpatHandler implements "atom:name" then Xmlns should have a
  // mapping from the "atom" prefix to the atom namespace.  ExpatHandler's
  // unprefixed elements "Placemark", for example, are in the Xmlns's default
  // namespace.
  ExpatHandlerNs(ExpatHandler* expat_handler, const Xmlns* xmlns);
  virtual ~ExpatHandlerNs() {}
  // This translates an expat-generated namespace qualified name into a
  // name with a prefix known to the Xmlns passed to the constructor.
  const string TranslatePrefixedName(
      const string prefixed_name) const;
  virtual void StartElement(const string& namespaced_named,
                            const StringVector& atts);
  virtual void EndElement(const string& namespaced_name);
  virtual void CharData(const string& s);
  virtual void StartNamespace(const string& prefix, const string& uri);
  virtual void EndNamespace(const string& prefix);

private:
  ExpatHandler* expat_handler_;
  const Xmlns* xmlns_;
};

}  // end namespace kmlbase

#endif  // KML_BASE_EXPAT_HANDLER_NS_H__