[7445] | 1 | #region License Information
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| 2 | /* HeuristicLab
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[16956] | 3 | * Copyright (C) 2002-2019 Heuristic and Evolutionary Algorithms Laboratory (HEAL)
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[7445] | 4 | *
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| 5 | * This file is part of HeuristicLab.
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| 6 | *
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| 7 | * HeuristicLab is free software: you can redistribute it and/or modify
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| 8 | * it under the terms of the GNU General Public License as published by
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| 9 | * the Free Software Foundation, either version 3 of the License, or
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| 10 | * (at your option) any later version.
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| 11 | *
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| 12 | * HeuristicLab is distributed in the hope that it will be useful,
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| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 15 | * GNU General Public License for more details.
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| 16 | *
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| 17 | * You should have received a copy of the GNU General Public License
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| 18 | * along with HeuristicLab. If not, see <http://www.gnu.org/licenses/>.
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| 19 | */
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| 20 | #endregion
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| 21 |
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| 22 | using System;
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| 23 | using System.IO;
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| 24 |
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| 25 | namespace HeuristicLab.Problems.Instances.QAPLIB {
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| 26 | public class QAPLIBParser {
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| 27 | public int Size { get; private set; }
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| 28 | public double[,] Distances { get; private set; }
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| 29 | public double[,] Weights { get; private set; }
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| 30 |
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| 31 | public QAPLIBParser() {
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| 32 | Reset();
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| 33 | }
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| 34 |
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| 35 | public void Reset() {
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| 36 | Size = 0;
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| 37 | Distances = null;
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| 38 | Weights = null;
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| 39 | }
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| 40 |
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[7538] | 41 | public void Parse(string file) {
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[7445] | 42 | using (Stream stream = new FileStream(file, FileMode.Open, FileAccess.Read)) {
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[7538] | 43 | Parse(stream);
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[7445] | 44 | }
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| 45 | }
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| 46 |
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| 47 | /// <summary>
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| 48 | /// Reads from the given stream data which is expected to be in the QAPLIB format.
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| 49 | /// </summary>
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| 50 | /// <remarks>
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| 51 | /// The stream is not closed or disposed. The caller has to take care of that.
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| 52 | /// </remarks>
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| 53 | /// <param name="stream">The stream to read data from.</param>
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| 54 | /// <returns>True if the file was successfully read or false otherwise.</returns>
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[7538] | 55 | public void Parse(Stream stream) {
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| 56 | var reader = new StreamReader(stream);
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| 57 | Size = int.Parse(reader.ReadLine());
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| 58 | Distances = new double[Size, Size];
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| 59 | Weights = new double[Size, Size];
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[8909] | 60 | char[] delim = new char[] { ' ', '\t' };
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[7445] | 61 |
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[7558] | 62 | Weights = ParseMatrix(reader, delim);
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[7538] | 63 | Distances = ParseMatrix(reader, delim);
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| 64 | }
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[7445] | 65 |
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[7538] | 66 | private double[,] ParseMatrix(StreamReader reader, char[] delim) {
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| 67 | int read = 0, k = 0;
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| 68 | double[,] result = new double[Size, Size];
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| 69 | while (k < Size) {
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| 70 | if (reader.EndOfStream) throw new InvalidDataException("Reached end of stream while reading second matrix.");
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| 71 | string valLine = reader.ReadLine();
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| 72 | while (String.IsNullOrWhiteSpace(valLine)) valLine = reader.ReadLine();
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| 73 | string[] vals = valLine.Split(delim, StringSplitOptions.RemoveEmptyEntries);
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| 74 | foreach (string val in vals) {
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[7558] | 75 | result[k, read++] = double.Parse(val);
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[7538] | 76 | if (read == Size) {
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| 77 | read = 0;
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| 78 | k++;
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[7445] | 79 | }
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| 80 | }
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| 81 | }
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[7538] | 82 | return result;
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[7445] | 83 | }
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| 84 | }
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| 85 | }
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