/**

 * Relational pipes (library)

 * Copyright © 2018 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 Lesser General Public License as published by the Free Software Foundation;

 *  - GNU General Public License as published by the Free Software Foundation;

 *

 * 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 <functional>

#include "../include/relpipe/reader/TypeId.h"

#include "../include/relpipe/reader/typedefs.h"

namespace relpipe {

namespace reader {

/**

 * This class contains common features that are independent from particular data type (generic/template type)

 */

class DataTypeReaderBase {

private:

	const TypeId typeId;

	const string_t typeCode;

public:

	DataTypeReaderBase(const TypeId typeId, const string_t typeCode) :

	typeId(typeId), typeCode(typeCode) {

	}

	virtual ~DataTypeReaderBase() {

	};

	/**

	 * TODO: delete, use handler?

	 * 

	 * @param input input stream, should be at position where the value is to be read; the stream will not be closed afred reading

	 * @return read value in form of the string representation of given data type.

	 * E.g. integer 123 is returned as a character string "123",

	 * boolean true is returned as a character string "true".

	 * See Relational pipes format specification for details.

	 */

	virtual string_t readString(std::istream &input) = 0;

	/**

	 * The value is read from the input and then passed to the handler.

	 * 

	 * @param input

	 * @param handler

	 */

	virtual void read(std::istream &input, std::function<void(const void *, const std::type_info&) > handler) = 0;

	/**

	 * TODO: documentation

	 * 

	 * @param input

	 * @param handler

	 */

	virtual void read(std::istream &input, std::function<void(const string_t&, const void *, const std::type_info&) > handler) = 0;

	/**

	 * @param dataType data type code as defined in DDP L0

	 * @return whether this class supports conversions of this type

	 */

	virtual bool supports(const TypeId &dataType) {

		return dataType == typeId;

	}

	/**

	 * @param dataType data type name as defined in DDP L0

	 * @return whether this class supports conversions of this type

	 */

	virtual bool supports(const string_t &dataType) {

		return dataType == typeCode;

	}

	TypeId getTypeId() {

		return typeId;

	}

	string_t getTypeCode() {

		return typeCode;

	}

};

}

}