TextEncoding.cpp

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//
// 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;


TextEncoding::~TextEncoding()
{
}


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


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


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

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


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


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


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


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


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


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


} // namespace Poco