1 | #region License Information
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2 | /* HeuristicLab
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3 | * Copyright (C) Heuristic and Evolutionary Algorithms Laboratory (HEAL)
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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.Threading;
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24 | using HEAL.Attic;
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25 | using HeuristicLab.Common;
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26 | using HeuristicLab.Core;
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27 |
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28 | namespace HeuristicLab.Parameters {
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29 | /// <summary>
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30 | /// A parameter whose value is retrieved from the scope.
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31 | /// </summary>
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32 | [Item("LookupParameter", "A parameter whose value is retrieved from or written to a scope.")]
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33 | [StorableType("84FE5F33-94B8-4E30-B1CB-CD15314FB83B")]
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34 | public class LookupParameter<T> : Parameter, IStatefulItem, ILookupParameter<T> where T : class, IItem {
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35 | [Storable]
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36 | private string actualName;
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37 | public string ActualName {
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38 | get { return actualName; }
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39 | set {
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40 | if (value == null) throw new ArgumentNullException();
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41 | if (string.IsNullOrWhiteSpace(value)) {
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42 | actualName = Name;
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43 | OnActualNameChanged();
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44 | } else if (!actualName.Equals(value)) {
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45 | actualName = value;
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46 | OnActualNameChanged();
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47 | }
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48 | }
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49 | }
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50 | public string TranslatedName {
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51 | get {
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52 | string translatedName = Name;
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53 | GetValueParameterAndTranslateName(ExecutionContext, ref translatedName);
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54 | return translatedName;
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55 | }
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56 | }
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57 | public new T ActualValue {
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58 | get { return (T)base.ActualValue; }
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59 | set { base.ActualValue = value; }
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60 | }
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61 |
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62 | private Lazy<ThreadLocal<IItem>> cachedActualValues;
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63 | protected IItem CachedActualValue {
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64 | get { return cachedActualValues.Value.Value; }
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65 | set { cachedActualValues.Value.Value = value; }
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66 | }
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67 |
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68 | private Lazy<ThreadLocal<IExecutionContext>> executionContexts;
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69 | public IExecutionContext ExecutionContext {
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70 | get { return executionContexts.Value.Value; }
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71 | set {
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72 | if (value != executionContexts.Value.Value) {
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73 | executionContexts.Value.Value = value;
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74 | cachedActualValues.Value.Value = null;
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75 | }
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76 | }
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77 | }
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78 |
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79 | [StorableConstructor]
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80 | protected LookupParameter(StorableConstructorFlag _) : base(_) {
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81 | cachedActualValues = new Lazy<ThreadLocal<IItem>>(() => { return new ThreadLocal<IItem>(); }, LazyThreadSafetyMode.ExecutionAndPublication);
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82 | executionContexts = new Lazy<ThreadLocal<IExecutionContext>>(() => { return new ThreadLocal<IExecutionContext>(); }, LazyThreadSafetyMode.ExecutionAndPublication);
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83 | }
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84 | protected LookupParameter(LookupParameter<T> original, Cloner cloner)
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85 | : base(original, cloner) {
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86 | actualName = original.actualName;
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87 | this.Hidden = original.Hidden;
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88 | cachedActualValues = new Lazy<ThreadLocal<IItem>>(() => { return new ThreadLocal<IItem>(); }, LazyThreadSafetyMode.ExecutionAndPublication);
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89 | executionContexts = new Lazy<ThreadLocal<IExecutionContext>>(() => { return new ThreadLocal<IExecutionContext>(); }, LazyThreadSafetyMode.ExecutionAndPublication);
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90 | }
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91 | public LookupParameter()
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92 | : base("Anonymous", typeof(T)) {
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93 | this.actualName = Name;
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94 | this.Hidden = false;
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95 | cachedActualValues = new Lazy<ThreadLocal<IItem>>(() => { return new ThreadLocal<IItem>(); }, LazyThreadSafetyMode.ExecutionAndPublication);
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96 | executionContexts = new Lazy<ThreadLocal<IExecutionContext>>(() => { return new ThreadLocal<IExecutionContext>(); }, LazyThreadSafetyMode.ExecutionAndPublication);
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97 | }
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98 | public LookupParameter(string name)
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99 | : base(name, typeof(T)) {
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100 | this.actualName = Name;
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101 | this.Hidden = false;
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102 | cachedActualValues = new Lazy<ThreadLocal<IItem>>(() => { return new ThreadLocal<IItem>(); }, LazyThreadSafetyMode.ExecutionAndPublication);
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103 | executionContexts = new Lazy<ThreadLocal<IExecutionContext>>(() => { return new ThreadLocal<IExecutionContext>(); }, LazyThreadSafetyMode.ExecutionAndPublication);
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104 | }
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105 | public LookupParameter(string name, string description)
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106 | : base(name, description, typeof(T)) {
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107 | this.actualName = Name;
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108 | this.Hidden = false;
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109 | cachedActualValues = new Lazy<ThreadLocal<IItem>>(() => { return new ThreadLocal<IItem>(); }, LazyThreadSafetyMode.ExecutionAndPublication);
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110 | executionContexts = new Lazy<ThreadLocal<IExecutionContext>>(() => { return new ThreadLocal<IExecutionContext>(); }, LazyThreadSafetyMode.ExecutionAndPublication);
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111 | }
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112 | public LookupParameter(string name, string description, string actualName)
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113 | : base(name, description, typeof(T)) {
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114 | this.actualName = string.IsNullOrWhiteSpace(actualName) ? Name : actualName;
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115 | this.Hidden = false;
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116 | cachedActualValues = new Lazy<ThreadLocal<IItem>>(() => { return new ThreadLocal<IItem>(); }, LazyThreadSafetyMode.ExecutionAndPublication);
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117 | executionContexts = new Lazy<ThreadLocal<IExecutionContext>>(() => { return new ThreadLocal<IExecutionContext>(); }, LazyThreadSafetyMode.ExecutionAndPublication);
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118 | }
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119 |
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120 | public override IDeepCloneable Clone(Cloner cloner) {
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121 | return new LookupParameter<T>(this, cloner);
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122 | }
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123 |
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124 | public override string ToString() {
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125 | if (Name.Equals(ActualName))
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126 | return Name;
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127 | else
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128 | return Name + ": " + ActualName;
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129 | }
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130 |
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131 | protected static IValueParameter GetValueParameterAndTranslateName(IExecutionContext executionContext, ref string translatedName) {
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132 | IValueParameter valueParam;
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133 | ILookupParameter lookupParam;
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134 | IExecutionContext currentExecutionContext = executionContext;
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135 |
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136 | while (currentExecutionContext != null) {
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137 | IParameter param = null;
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138 | while (currentExecutionContext != null && (!currentExecutionContext.Parameters.TryGetValue(translatedName, out param)
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139 | || param is IContextLookupParameter))
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140 | currentExecutionContext = currentExecutionContext.Parent;
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141 | if (currentExecutionContext == null) break;
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142 |
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143 | valueParam = param as IValueParameter;
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144 | lookupParam = param as ILookupParameter;
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145 |
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146 | if (valueParam == null && lookupParam == null)
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147 | throw new InvalidOperationException(
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148 | string.Format("Parameter look-up chain broken. Parameter \"{0}\" is neither an \"{1}\" nor an \"{2}\".",
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149 | translatedName, typeof(IValueParameter).GetPrettyName(), typeof(ILookupParameter).GetPrettyName())
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150 | );
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151 |
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152 | if (valueParam != null) {
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153 | if (valueParam.Value != null) return valueParam;
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154 | else if (lookupParam == null) return valueParam;
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155 | }
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156 | translatedName = lookupParam.ActualName;
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157 |
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158 | currentExecutionContext = currentExecutionContext.Parent;
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159 | }
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160 | return null;
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161 | }
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162 | protected static IVariable LookupVariable(IScope scope, string name) {
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163 | IVariable variable = null;
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164 | while (scope != null && !scope.Variables.TryGetValue(name, out variable))
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165 | scope = scope.Parent;
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166 | return scope != null ? variable : null;
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167 | }
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168 |
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169 | protected override IItem GetActualValue() {
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170 | if (CachedActualValue != null) return CachedActualValue;
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171 |
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172 | string translatedName = Name;
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173 | var value = GetValue(ExecutionContext, ref translatedName);
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174 | if (value != null && !(value is T))
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175 | throw new InvalidOperationException(
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176 | string.Format("Type mismatch. Variable \"{0}\" does not contain a \"{1}\".",
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177 | translatedName,
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178 | typeof(T).GetPrettyName())
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179 | );
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180 | CachedActualValue = value;
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181 | return value;
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182 | }
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183 |
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184 | protected static IItem GetValue(IExecutionContext executionContext, ref string name) {
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185 | // try to get value from context stack
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186 | IValueParameter param = GetValueParameterAndTranslateName(executionContext, ref name);
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187 | if (param != null) return param.Value;
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188 |
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189 | // try to get variable from scope
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190 | IVariable var = LookupVariable(executionContext.Scope, name);
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191 | return var != null ? var.Value : null;
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192 | }
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193 |
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194 | protected override void SetActualValue(IItem value) {
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195 | if (!(value is T))
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196 | throw new InvalidOperationException(
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197 | string.Format("Type mismatch. Value is not a \"{0}\".",
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198 | typeof(T).GetPrettyName())
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199 | );
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200 | CachedActualValue = value;
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201 |
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202 | string translatedName = Name;
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203 | SetValue(ExecutionContext, ref translatedName, value);
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204 | }
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205 |
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206 | protected static void SetValue(IExecutionContext executionContext, ref string name, IItem value) {
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207 | // try to set value in context stack
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208 | IValueParameter param = GetValueParameterAndTranslateName(executionContext, ref name);
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209 | if (param != null) {
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210 | param.Value = value;
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211 | return;
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212 | }
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213 |
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214 | // try to set value in scope
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215 | IVariable var = LookupVariable(executionContext.Scope, name);
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216 | if (var != null) {
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217 | var.Value = value;
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218 | return;
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219 | }
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220 |
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221 | // create new variable
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222 | executionContext.Scope.Variables.Add(new Variable(name, value));
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223 | }
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224 |
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225 | public virtual void InitializeState() {
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226 | }
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227 | public virtual void ClearState() {
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228 | if (cachedActualValues.IsValueCreated) {
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229 | cachedActualValues.Value.Dispose();
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230 | cachedActualValues = new Lazy<ThreadLocal<IItem>>(() => { return new ThreadLocal<IItem>(); }, LazyThreadSafetyMode.ExecutionAndPublication);
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231 | }
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232 | if (executionContexts.IsValueCreated) {
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233 | executionContexts.Value.Dispose();
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234 | executionContexts = new Lazy<ThreadLocal<IExecutionContext>>(() => { return new ThreadLocal<IExecutionContext>(); }, LazyThreadSafetyMode.ExecutionAndPublication);
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235 | }
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236 | }
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237 |
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238 | public event EventHandler ActualNameChanged;
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239 | protected virtual void OnActualNameChanged() {
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240 | EventHandler handler = ActualNameChanged;
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241 | if (handler != null) handler(this, EventArgs.Empty);
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242 | OnToStringChanged();
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243 | }
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244 | }
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245 | }
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