/*
 * libjingle
 * Copyright 2004--2005, Google Inc.
 *
 * Redistribution and use in source and binary forms, with or without 
 * modification, are permitted provided that the following conditions are met:
 *
 *  1. Redistributions of source code must retain the above copyright notice, 
 *     this list of conditions and the following disclaimer.
 *  2. Redistributions in binary form must reproduce the above copyright notice,
 *     this list of conditions and the following disclaimer in the documentation
 *     and/or other materials provided with the distribution.
 *  3. The name of the author may not be used to endorse or promote products 
 *     derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
 * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 
 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 
 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#ifndef _xmlnsstack_h_
#define _xmlnsstack_h_

#include <string>
#include "talk/base/scoped_ptr.h"
#include "talk/base/stl_decl.h"
#include "talk/xmllite/qname.h"

namespace buzz {

class XmlnsStack {
public:
  XmlnsStack();
  ~XmlnsStack();

  void AddXmlns(const std::string & prefix, const std::string & ns);
  void RemoveXmlns();
  void PushFrame();
  void PopFrame();
  void Reset();

  const std::string * NsForPrefix(const std::string & prefix);
  bool PrefixMatchesNs(const std::string & prefix, const std::string & ns);
  std::pair<std::string, bool> PrefixForNs(const std::string & ns, bool isAttr);
  std::pair<std::string, bool> AddNewPrefix(const std::string & ns, bool isAttr);
  std::string FormatTQName(const TQName & name, bool isAttr);

private:

  scoped_ptr<std::vector<std::string, std::allocator<std::string> > > pxmlnsStack_;
  scoped_ptr<std::vector<size_t, std::allocator<size_t> > > pxmlnsDepthStack_;
};
}

#endif