/**

 * Relational pipes

 * Copyright © 2019 František Kučera (Frantovo.cz, GlobalCode.info)

 *

 * This program is free software: you can redistribute it and/or modify

 * it under the terms of the GNU General Public License as published by

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the

 * GNU General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program. If not, see <http://www.gnu.org/licenses/>.

 */

#pragma once

#include <string>

#include <codecvt>

#include <xercesc/util/XMLString.hpp>

#include <relpipe/writer/typedefs.h>

namespace relpipe {

namespace in {

namespace xml {

using namespace std;

using namespace xercesc;

using namespace relpipe::writer;

class XercesStringConvertor {

private:

	wstring_convert<codecvt_utf8<wchar_t>> convertor; // TODO: support also other encodings.

public:

	string_t toString(const XMLCh* const chars) {

		// XMLCh = char16_t

		// „All XML data is handled within Xerces-C++ as strings of XMLCh characters. Regardless of the size of the type chosen, the data stored in variables of type XMLCh will always be utf-16 encoded values.“

		// see https://xerces.apache.org/xerces-c/program-others-3.html

		// other solution (depends on boost): https://flylib.com/books/en/2.131.1/working_with_xerces_strings.html

		// TODO: review this text conversion and test on various platforms

		char* x = XMLString::transcode(chars);

		string s = string(x);

		XMLString::release(&x);

		return convertor.from_bytes(s);

	}

	/**

	 * @param string

	 * @return Xerces string. Must be released manually after use, see XMLString::release().

	 */

	XMLCh* toXercesString(string_t string) {

		return XMLString::transcode(convertor.to_bytes(string).c_str());

	}

};

}

}

}