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TextEncoding.cpp

//
// TextEncoding.cpp
//
// $Id: //poco/1.3/Foundation/src/TextEncoding.cpp#2 $
//
// Library: Foundation
// Package: Text
// Module:  TextEncoding
//
// Copyright (c) 2004-2006, Applied Informatics Software Engineering GmbH.
// and Contributors.
//
// Permission is hereby granted, free of charge, to any person or organization
// obtaining a copy of the software and accompanying documentation covered by
// this license (the "Software") to use, reproduce, display, distribute,
// execute, and transmit the Software, and to prepare derivative works of the
// Software, and to permit third-parties to whom the Software is furnished to
// do so, all subject to the following:
// 
// The copyright notices in the Software and this entire statement, including
// the above license grant, this restriction and the following disclaimer,
// must be included in all copies of the Software, in whole or in part, and
// all derivative works of the Software, unless such copies or derivative
// works are solely in the form of machine-executable object code generated by
// a source language processor.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
// SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
// FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
// ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
// DEALINGS IN THE SOFTWARE.
//


#include "Poco/TextEncoding.h"
#include "Poco/Exception.h"
#include "Poco/String.h"
#include "Poco/ASCIIEncoding.h"
#include "Poco/Latin1Encoding.h"
#include "Poco/Latin9Encoding.h"
#include "Poco/UTF16Encoding.h"
#include "Poco/UTF8Encoding.h"
#include "Poco/Windows1252Encoding.h"
#include "Poco/RWLock.h"
#include "Poco/SingletonHolder.h"
#include <map>


namespace Poco {


//
// TextEncodingManager
//


class TextEncodingManager
{
public:
      TextEncodingManager()
      {
            TextEncoding::Ptr pUtf8Encoding(new UTF8Encoding);
            add(pUtf8Encoding, TextEncoding::GLOBAL); 

            add(new ASCIIEncoding);
            add(new Latin1Encoding);
            add(new Latin9Encoding);
            add(pUtf8Encoding);
            add(new UTF16Encoding);
            add(new Windows1252Encoding);
      }
      
      ~TextEncodingManager()
      {
      }
      
      void add(TextEncoding::Ptr pEncoding)
      {
            add(pEncoding, pEncoding->canonicalName());
      }
      
      void add(TextEncoding::Ptr pEncoding, const std::string& name)
      {
            RWLock::ScopedLock lock(_lock, true);
      
            _encodings[name] = pEncoding;
      }
      
      void remove(const std::string& name)
      {
            RWLock::ScopedLock lock(_lock, true);
      
            _encodings.erase(name);
      }
      
      TextEncoding::Ptr find(const std::string& name) const
      {
            RWLock::ScopedLock lock(_lock);
            
            EncodingMap::const_iterator it = _encodings.find(name);
            if (it != _encodings.end())
                  return it->second;
            
            for (it = _encodings.begin(); it != _encodings.end(); ++it)
            {
                  if (it->second->isA(name))
                        return it->second;
            }
            return TextEncoding::Ptr();
      }

private:
      TextEncodingManager(const TextEncodingManager&);
      TextEncodingManager& operator = (const TextEncodingManager&);
      
      struct ILT
      {
            bool operator() (const std::string& s1, const std::string& s2) const
            {
                  return Poco::icompare(s1, s2) < 0;
            }
      };
      
      typedef std::map<std::string, TextEncoding::Ptr, ILT> EncodingMap;
      
      EncodingMap    _encodings;
      mutable RWLock _lock;
};


//
// TextEncoding
//


const std::string TextEncoding::GLOBAL;


00141 TextEncoding::~TextEncoding()
{
}


00146 int TextEncoding::convert(const unsigned char* bytes) const
{
      return (int) *bytes;
}


00152 int TextEncoding::convert(int ch, unsigned char* bytes, int length) const
{
      return 0;
}


00158 TextEncoding& TextEncoding::byName(const std::string& encodingName)
{
      TextEncoding* pEncoding = manager().find(encodingName);
      if (pEncoding)
            return *pEncoding;
      else
            throw NotFoundException(encodingName);
}

      
00168 TextEncoding::Ptr TextEncoding::find(const std::string& encodingName)
{
      return manager().find(encodingName);
}


00174 void TextEncoding::add(TextEncoding::Ptr pEncoding)
{
      manager().add(pEncoding, pEncoding->canonicalName());
}


00180 void TextEncoding::add(TextEncoding::Ptr pEncoding, const std::string& name)
{
      manager().add(pEncoding, name);
}


00186 void TextEncoding::remove(const std::string& encodingName)
{
      manager().remove(encodingName);
}


00192 TextEncoding::Ptr TextEncoding::global(TextEncoding::Ptr encoding)
{
      TextEncoding::Ptr prev = find(GLOBAL);
      add(encoding, GLOBAL);
      return prev;
}


00200 TextEncoding& TextEncoding::global()
{
      return byName(GLOBAL);
}


00206 TextEncodingManager& TextEncoding::manager()
{
      static SingletonHolder<TextEncodingManager> sh;
      return *sh.get();
}


} // namespace Poco

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