[3742] | 1 | #region License Information
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| 2 | /* HeuristicLab
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[12009] | 3 | * Copyright (C) 2002-2015 Heuristic and Evolutionary Algorithms Laboratory (HEAL)
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[3742] | 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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[4132] | 23 | using System.Collections;
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[1567] | 24 | using System.Collections.Generic;
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| 25 | using System.Text;
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[4068] | 26 | using HeuristicLab.Persistence.Auxiliary;
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| 27 | using HeuristicLab.Persistence.Core;
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[1823] | 28 | using HeuristicLab.Persistence.Default.CompositeSerializers.Storable;
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[4068] | 29 | using HeuristicLab.Persistence.Interfaces;
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[1567] | 30 |
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[1823] | 31 | namespace HeuristicLab.Persistence.Default.CompositeSerializers {
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[1567] | 32 |
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[3017] | 33 | [StorableClass]
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[3946] | 34 | public sealed class CompactNumberArray2StringSerializer : ICompositeSerializer {
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[1567] | 35 |
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[4132] | 36 | private class ElementEnumerator : IEnumerator<string> {
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| 37 |
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| 38 | private IEnumerator<Tag> tagIt;
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| 39 | private IEnumerator<string> valIt;
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| 40 |
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| 41 | public ElementEnumerator(IEnumerable<Tag> tags) {
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| 42 | tagIt = tags.GetEnumerator();
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| 43 | }
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| 44 |
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| 45 | public string Current {
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| 46 | get {
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| 47 | if (valIt == null)
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| 48 | throw new InvalidOperationException("no current value");
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| 49 | return valIt.Current;
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| 50 | }
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| 51 | }
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| 52 |
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| 53 | public void Dispose() {
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| 54 | valIt.Dispose();
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| 55 | valIt = null;
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| 56 | tagIt.Dispose();
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| 57 | }
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| 58 |
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| 59 | object IEnumerator.Current {
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| 60 | get { return this.Current; }
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| 61 | }
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| 62 |
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| 63 | public bool MoveNext() {
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| 64 | if (valIt != null && valIt.MoveNext())
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| 65 | return true;
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| 66 | if (tagIt.MoveNext()) {
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| 67 | if (valIt != null)
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| 68 | valIt.Dispose();
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| 69 | valIt = ((string)tagIt.Current.Value).GetSplitEnumerator(';');
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| 70 | return MoveNext();
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| 71 | }
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| 72 | valIt.Dispose();
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| 73 | valIt = null;
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| 74 | return false;
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| 75 | }
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| 76 |
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| 77 | public void Reset() {
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| 78 | valIt.Dispose();
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| 79 | tagIt.Reset();
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| 80 | }
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| 81 | }
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| 82 |
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[4806] | 83 | [StorableConstructor]
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| 84 | private CompactNumberArray2StringSerializer(bool deserializing) { }
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| 85 | public CompactNumberArray2StringSerializer() { }
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| 86 |
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[3946] | 87 | public const int SPLIT_THRESHOLD = 1024 * 1024;
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| 88 |
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[1567] | 89 | public int Priority {
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| 90 | get { return 200; }
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| 91 | }
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| 92 |
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[1823] | 93 | private static readonly Number2StringSerializer numberConverter =
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| 94 | new Number2StringSerializer();
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[1567] | 95 |
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[1823] | 96 | public bool CanSerialize(Type type) {
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[1567] | 97 | return
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| 98 | (type.IsArray || type == typeof(Array)) &&
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[1823] | 99 | numberConverter.CanSerialize(type.GetElementType());
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[1567] | 100 | }
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| 101 |
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[2993] | 102 | public string JustifyRejection(Type type) {
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| 103 | if (!type.IsArray && type != typeof(Array))
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| 104 | return "not an array";
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| 105 | return string.Format("number converter cannot serialize elements: " +
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| 106 | numberConverter.JustifyRejection(type.GetElementType()));
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| 107 | }
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| 108 |
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[1567] | 109 | public IEnumerable<Tag> CreateMetaInfo(object obj) {
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| 110 | Array a = (Array)obj;
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| 111 | int[] lengths = new int[a.Rank];
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| 112 | int[] lowerBounds = new int[a.Rank];
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[3946] | 113 | StringBuilder sb = new StringBuilder(a.Rank * 6);
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[1567] | 114 | sb.Append(a.Rank).Append(';');
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| 115 | for (int i = 0; i < a.Rank; i++) {
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| 116 | sb.Append(a.GetLength(i)).Append(';');
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| 117 | lengths[i] = a.GetLength(i);
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| 118 | }
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| 119 | for (int i = 0; i < a.Rank; i++) {
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| 120 | sb.Append(a.GetLowerBound(i)).Append(';');
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| 121 | lowerBounds[i] = a.GetLowerBound(i);
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| 122 | }
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[3946] | 123 | int nElements = 1;
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| 124 | for (int i = 0; i < a.Rank; i++) {
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| 125 | lowerBounds[i] = a.GetLowerBound(i);
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| 126 | lengths[i] = a.GetLength(i);
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| 127 | nElements *= lengths[i];
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| 128 | }
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[4132] | 129 | sb.Capacity += Math.Min(nElements * 3, SPLIT_THRESHOLD);
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[1567] | 130 | int[] positions = (int[])lowerBounds.Clone();
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| 131 | while (positions[a.Rank - 1] < lengths[a.Rank - 1] + lowerBounds[a.Rank - 1]) {
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| 132 | sb.Append(numberConverter.Format(a.GetValue(positions))).Append(';');
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[3946] | 133 | if (sb.Length > SPLIT_THRESHOLD && sb.Length > sb.Capacity - 18) {
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| 134 | yield return new Tag(sb.ToString());
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| 135 | sb = new StringBuilder(Math.Min(nElements * 3, SPLIT_THRESHOLD));
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| 136 | }
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[1567] | 137 | positions[0] += 1;
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| 138 | for (int i = 0; i < a.Rank - 1; i++) {
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| 139 | if (positions[i] >= lengths[i] + lowerBounds[i]) {
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| 140 | positions[i] = lowerBounds[i];
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| 141 | positions[i + 1] += 1;
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| 142 | } else {
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| 143 | break;
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| 144 | }
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| 145 | }
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| 146 | }
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[3946] | 147 | if (sb.Length > 0)
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| 148 | yield return new Tag(sb.ToString());
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[1567] | 149 | }
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| 150 |
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[3946] | 151 | private static Tag[] emptyTag = new Tag[0];
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[1567] | 152 | public IEnumerable<Tag> Decompose(object obj) {
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[3946] | 153 | return emptyTag;
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[1567] | 154 | }
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| 155 |
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| 156 | public object CreateInstance(Type type, IEnumerable<Tag> metaInfo) {
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[1625] | 157 | try {
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[4132] | 158 | var valueIter = new ElementEnumerator(metaInfo);
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[1567] | 159 | valueIter.MoveNext();
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[3946] | 160 | int rank = int.Parse(valueIter.Current);
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[1625] | 161 | int[] lengths = new int[rank];
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| 162 | int[] lowerBounds = new int[rank];
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| 163 | for (int i = 0; i < rank; i++) {
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| 164 | valueIter.MoveNext();
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[3946] | 165 | lengths[i] = int.Parse(valueIter.Current);
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[1625] | 166 | }
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| 167 | for (int i = 0; i < rank; i++) {
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| 168 | valueIter.MoveNext();
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[3946] | 169 | lowerBounds[i] = int.Parse(valueIter.Current);
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[1625] | 170 | }
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| 171 | Type elementType = type.GetElementType();
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| 172 | Array a = Array.CreateInstance(elementType, lengths, lowerBounds);
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[3946] | 173 | if (a == null) throw new PersistenceException("invalid instance data type, expected array");
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[1625] | 174 | int[] positions = (int[])lowerBounds.Clone();
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[4132] | 175 |
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| 176 | while (valueIter.MoveNext()) {
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| 177 | a.SetValue(numberConverter.Parse(valueIter.Current, elementType), positions);
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| 178 | positions[0] += 1;
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| 179 | for (int i = 0; i < a.Rank - 1; i++) {
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| 180 | if (positions[i] >= lengths[i] + lowerBounds[i]) {
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| 181 | positions[i + 1] += 1;
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| 182 | positions[i] = lowerBounds[i];
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| 183 | } else {
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| 184 | break;
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[1625] | 185 | }
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[1567] | 186 | }
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| 187 | }
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[1625] | 188 | return a;
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[4806] | 189 | }
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| 190 | catch (InvalidOperationException e) {
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[3946] | 191 | throw new PersistenceException("Insuffictient data to deserialize compact array", e);
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[4806] | 192 | }
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| 193 | catch (InvalidCastException e) {
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[1625] | 194 | throw new PersistenceException("Invalid element data during compact array deserialization", e);
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[1703] | 195 | }
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[1567] | 196 | }
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| 197 |
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| 198 | public void Populate(object instance, IEnumerable<Tag> tags, Type type) {
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[3946] | 199 | // Nothing to do. Arrays are populated during instance creation;
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[1567] | 200 | }
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| 201 |
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| 202 | }
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| 203 |
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| 204 | } |
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