FileHandler.cpp

#include "FileHandler.h"
#include <fstream>
#include <sstream>
#include <vector>
#include <iostream>
#include <string>

Graph* FileHandler::load_graph(string path) {

	ifstream dataFile(path);

	if (!dataFile.is_open()) {
		throw std::runtime_error("error: File not found.");
	}

	string line = "";
	Graph* data = nullptr;
	int i = 0;
	int no_vertices = 0;


	getline(dataFile, line);
	getline(dataFile, line);
	getline(dataFile, line);
	getline(dataFile, line);
	line.erase(0, 11);
	no_vertices = stoi(line);
	getline(dataFile, line);
	getline(dataFile, line);
	getline(dataFile, line);

	data = new Graph(no_vertices);


	int** matrix = new int* [no_vertices];
	for (int i = 0; i < no_vertices; i++) {
		matrix[i] = new int[no_vertices];
	}
	for (int i = 0; i < no_vertices; i++) {
		for (int j = 0; j < no_vertices; j++) {
			dataFile >> matrix[i][j];
		}
	}

	data->data = matrix;
	return data;

}

int FileHandler::load_solution(Graph* data, string path) {
	ifstream dataFile(path);

	if (!dataFile.is_open()) {
		throw std::runtime_error("error: File not found.");
	}

	string line;

	getline(dataFile, line);
	int no_vertices = stoi(line);

	if (no_vertices + 1 != data->no_vertices) {
		cout << endl << "the saved solution appears to be generated for different graph" << endl;
		return -1;
	}

	vector<int> solution;
	getline(dataFile, line);
	stringstream ss(line);
	int vertex;

	while (ss >> vertex) {
		solution.push_back(vertex);
	}

	dataFile.close();

	int cost = 0;

	for (int i = 0; i < solution.size() - 1; i++) {
		cost += data->edge_weight(solution[i], solution[i + 1]);
	}

	return cost;


}


void FileHandler::save_records(vector<pair<int, double>> records, string path) {

	ofstream file(path);

	if (!file.is_open()) {
		throw ios_base::failure("Failed to open the file: " + path);
	}


	for (size_t i = 0; i < records.size(); ++i) {
		file << to_string(records[i].first) + ";" + to_string(records[i].second) + '\n';
	}
	file.close();

}


void FileHandler::save_solution(vector<int> solution, string path) {

	ofstream file(path);

	if (!file.is_open()) {
		throw ios_base::failure("Failed to open the file: " + path);
	}

	file << solution.size() << "\n";

	for (size_t i = 0; i < solution.size(); ++i) {
		file << solution[i];
		if (i < solution.size() - 1) {
			file << " ";
		}
	}
	file << " " << solution[0];
	file << "\n";
	file.close();

	cout << "file saved" << endl;
}