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diff --git a/src/graphcoloring/levels/graphloader.hpp b/src/graphcoloring/levels/graphloader.hpp
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+////////////////////////////////////////////////////////////////////////////////
+// Copyright (C) 2018 Leo Tenenbaum
+// This file is part of GraphColoring.
+//
+// GraphColoring 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.
+//
+// GraphColoring 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 GraphColoring.  If not, see <https://www.gnu.org/licenses/>.
+////////////////////////////////////////////////////////////////////////////////
+
+#ifndef GRAPHCOLORING_LEVELS_GRAPHLOADER_H_
+#define GRAPHCOLORING_LEVELS_GRAPHLOADER_H_
+
+#include <memory>
+
+#include "../graphs/graph.hpp"
+#include "pugi/pugixml.hpp"
+#include "colorloader.hpp"
+#include "globalloader.hpp"
+
+namespace graphcoloring {
+
+class GraphLoader {
+public:
+	GraphLoader(const ColorLoader& color_loader,
+		const GlobalLoader& global_loader);
+	virtual ~GraphLoader() {}
+	// Load document into graph
+	void LoadDocument(const pugi::xml_document& document, Graph& graph);
+	// Returns id of vertex, or -1 if there is no vertex with that name.
+	int GetVertexByName(const std::string& name) const;
+	int GetEdgeByName(const std::string& name) const;
+	void WriteGraph(const Graph& graph, pugi::xml_node& node) const;
+	std::map<std::string, int> vertex_ids;
+	std::map<std::string, int> edge_ids;
+private:
+	bool IsVertexProtected(std::string protections, char protection) const;
+	bool IsEdgeProtected(std::string protections, char protection) const;
+	void ReadVertex(pugi::xml_node vertex_node, Graph& graph);
+	void ReadEdge(pugi::xml_node edge_node, Graph& graph);
+	void WriteVertex(const Vertex& vertex, pugi::xml_node& node) const;
+	void WriteEdge(const Edge& edge, pugi::xml_node& node) const;
+	const ColorLoader& color_loader;
+	const GlobalLoader& global_loader;
+};
+
+} // namespace graphcoloring
+
+#endif // GRAPHCOLORING_LEVELS_GRAPHLOADER_H_