xml_file.h

// Copyright 2008, Google Inc. All rights reserved.
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// This file contains the implementation of the XmlFile class.

#ifndef KML_BASE_XML_FILE_H__
#define KML_BASE_XML_FILE_H__

#include <map>
#include "boost/intrusive_ptr.hpp"
#include "kml/base/xml_element.h"
#include "kml/base/referent.h"
#include "kml/base/util.h"

namespace kmlbase {

// TODO: use a typedef (or type) for XmlId
typedef std::map<string, XmlElementPtr> XmlElementIdMap;

// This class represents an XML file (in XML standards this is known as a
// "document", however we avoid that term due to the use of "<Document>" as
// an element in KML).  An XmlFile may have a URL, a root XmlElement and
// a set of xml ID to XmlElement mappings.
class XmlFile : public Referent {
 public:
  const string& get_url() const {
    return url_;
  }

  const XmlElementPtr& get_root() const {
    return root_;
  }

 protected:
  void set_url(const string& url) {
    url_ = url;
  }

  bool set_root(const XmlElementPtr& element) {
    return root_ ? false : (root_ = element, true);
  }

  XmlElementPtr FindXmlElementById(const string& id) const {
    XmlElementIdMap::const_iterator find = id_map_.find(id);
    return find != id_map_.end() ? find->second : NULL;
  }

 protected:
  // This is an abstract base class and is never created directly.
  XmlFile() {}

 private:
  // TODO: use a typedef for URL and/or URL string
  string url_;
  XmlElementPtr root_;
  XmlElementIdMap id_map_;
  LIBKML_DISALLOW_EVIL_CONSTRUCTORS(XmlFile);
};

}  // end namespace kmlbase

#endif // KML_BASE_XML_FILE_H__