FileReaderFactory.cpp


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#include <memory>

#include "FileReaderFactory.h"
#include "FileReader.h"

using namespace std;

unique_ptr<FileReader> FileReaderFactory::open(const std::string url) {
	FileReader * reader = find_reader(url)->clone();
	reader->open(url);
	return unique_ptr<FileReader>(reader);
}

void FileReaderFactory::register_strategy(const std::string type, const FileReader * node) {
	static FactoryMap & map = get_map();
	map[type] = node;
}

FactoryMap & FileReaderFactory::get_map() {
	static FactoryMap map;
	return map;
}

const FileReader * FileReaderFactory::find_reader(const std::string type) {
	static FactoryMap & map = get_map();

	// try to find protocol by prefix
	for (auto item : map) {
		if (!type.starts_with(item.first)) continue;
		return item.second;
	}

	// fallback is local file
	return map.find("file://")->second;
}