/**
 * Relational pipes
 * 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 General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * 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 <istream>

#include <xercesc/sax/InputSource.hpp>
#include <xercesc/util/PlatformUtils.hpp>
#include <xercesc/util/BinInputStream.hpp>

namespace relpipe {
namespace in {
namespace xml {

class StreamInputSource : public xercesc::InputSource {
private:
	std::istream& input;

	class StreamBinInputStream : public xercesc::BinInputStream {
	private:
		std::istream& input;
	public:

		StreamBinInputStream(std::istream& input) : BinInputStream(), input(input) {
		}

		XMLFilePos curPos() const override {
			return input.tellg();
		}

		const XMLCh* getContentType() const override {
			return nullptr;
		}

		XMLSize_t readBytes(XMLByte * const toFill, const XMLSize_t maxToRead) override {
			input.read((char*) toFill, maxToRead);
			return input.gcount();
		}
	};

public:

	StreamInputSource(std::istream& input, xercesc::MemoryManager * const manager = xercesc::XMLPlatformUtils::fgMemoryManager) : InputSource(manager), input(input) {
	}

	virtual ~StreamInputSource() {
	}

	xercesc::BinInputStream* makeStream() const override {
		// TODO: avoid multiple calls, input can be used only once 
		return new StreamBinInputStream(input);
	}
};

}
}
}