[8571] | 1 | #region License Information
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| 2 |
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| 3 | /* HeuristicLab
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[12012] | 4 | * Copyright (C) 2002-2015 Heuristic and Evolutionary Algorithms Laboratory (HEAL)
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[8571] | 5 | *
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| 6 | * This file is part of HeuristicLab.
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| 7 | *
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| 8 | * HeuristicLab is free software: you can redistribute it and/or modify
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| 9 | * it under the terms of the GNU General Public License as published by
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| 10 | * the Free Software Foundation, either version 3 of the License, or
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| 11 | * (at your option) any later version.
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| 12 | *
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| 13 | * HeuristicLab is distributed in the hope that it will be useful,
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| 14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 16 | * GNU General Public License for more details.
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| 17 | *
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| 18 | * You should have received a copy of the GNU General Public License
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| 19 | * along with HeuristicLab. If not, see <http://www.gnu.org/licenses/>.
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| 20 | */
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| 21 |
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| 22 | #endregion
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| 23 |
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| 24 | using System;
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| 25 | using System.Collections.Generic;
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| 26 | using System.Linq;
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| 27 | using System.Reflection;
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| 28 |
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| 29 | namespace HeuristicLab.PluginInfrastructure {
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| 30 | internal static class TypeExtensions {
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| 31 | internal static bool IsNonDiscoverableType(this Type t) {
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| 32 | return t.GetCustomAttributes(typeof(NonDiscoverableTypeAttribute), false).Any();
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| 33 | }
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| 34 |
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| 35 | /// <summary>
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| 36 | /// Constructs a concrete type from a given proto type.
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| 37 | /// </summary>
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| 38 | /// <param name="type"></param>
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| 39 | /// <param name="protoType"></param>
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| 40 | /// <returns>The constructed type, a generic type definition or null, if a type construction is not possible</returns>
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| 41 | /// <remarks>This method does not work with nested generic types</remarks>
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| 42 | internal static Type BuildType(this Type type, Type protoType) {
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| 43 | if (type == null || protoType == null) throw new ArgumentNullException();
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| 44 |
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| 45 | if (!type.IsGenericTypeDefinition) return type;
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| 46 | if (protoType.IsGenericTypeDefinition) return type;
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| 47 | if (!protoType.IsGenericType) return type;
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| 48 |
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| 49 | var typeGenericArguments = type.GetGenericArguments();
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| 50 | var protoTypeGenericArguments = protoType.GetGenericArguments();
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| 51 | if (typeGenericArguments.Length != protoTypeGenericArguments.Length) return null;
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| 52 |
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| 53 | for (int i = 0; i < typeGenericArguments.Length; i++) {
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| 54 | var typeGenericArgument = typeGenericArguments[i];
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| 55 | var protoTypeGenericArgument = protoTypeGenericArguments[i];
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| 56 |
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| 57 | //check class contraint on generic type parameter
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| 58 | if (typeGenericArgument.GenericParameterAttributes.HasFlag(GenericParameterAttributes.ReferenceTypeConstraint))
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| 59 | if (!protoTypeGenericArgument.IsClass && !protoTypeGenericArgument.IsInterface && !protoType.IsArray) return null;
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| 60 |
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| 61 | //check default constructor constraint on generic type parameter
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| 62 | if (typeGenericArgument.GenericParameterAttributes.HasFlag(GenericParameterAttributes.DefaultConstructorConstraint))
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| 63 | if (!protoTypeGenericArgument.IsValueType && protoTypeGenericArgument.GetConstructor(Type.EmptyTypes) == null) return null;
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| 64 |
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| 65 | //check type restrictions on generic type parameter
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| 66 | foreach (var constraint in typeGenericArgument.GetGenericParameterConstraints())
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| 67 | if (!constraint.IsAssignableFrom(protoTypeGenericArgument)) return null;
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| 68 | }
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| 69 |
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| 70 | try {
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| 71 | return type.MakeGenericType(protoTypeGenericArguments);
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| 72 | }
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| 73 | catch (Exception) {
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| 74 | return null;
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| 75 | }
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| 76 | }
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| 77 |
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[13422] | 78 | internal static bool IsAssignableTo(this Type subType, Type baseType) {
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[8571] | 79 | if (baseType.IsAssignableFrom(subType)) return true;
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[13422] | 80 |
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| 81 | //check generics
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[8571] | 82 | if (!baseType.IsGenericType) return false;
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[13422] | 83 | if (RecursiveCheckGenericTypes(baseType, subType)) return true;
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[8571] | 84 |
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[13422] | 85 | //check generic interfaces
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[8571] | 86 | IEnumerable<Type> implementedInterfaces = subType.GetInterfaces().Where(t => t.IsGenericType);
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[13422] | 87 | return implementedInterfaces.Any(implementedInterface => baseType.CheckGenericTypes(implementedInterface));
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[8571] | 88 | }
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| 89 |
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| 90 | private static bool RecursiveCheckGenericTypes(Type baseType, Type subType) {
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| 91 | if (!baseType.IsGenericType) return false;
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[13422] | 92 | if (subType.IsGenericType && baseType.CheckGenericTypes(subType)) return true;
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[8571] | 93 | if (subType.BaseType == null) return false;
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| 94 |
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| 95 | return RecursiveCheckGenericTypes(baseType, subType.BaseType);
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| 96 | }
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| 97 |
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| 98 | private static bool CheckGenericTypes(this Type baseType, Type subType) {
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| 99 | var baseTypeGenericTypeDefinition = baseType.GetGenericTypeDefinition();
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| 100 | var subTypeGenericTypeDefinition = subType.GetGenericTypeDefinition();
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| 101 | if (baseTypeGenericTypeDefinition != subTypeGenericTypeDefinition) return false;
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[13422] | 102 |
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[8571] | 103 | var baseTypeGenericArguments = baseType.GetGenericArguments();
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| 104 | var subTypeGenericArguments = subType.GetGenericArguments();
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| 105 |
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| 106 | for (int i = 0; i < baseTypeGenericArguments.Length; i++) {
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| 107 | var baseTypeGenericArgument = baseTypeGenericArguments[i];
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| 108 | var subTypeGenericArgument = subTypeGenericArguments[i];
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| 109 |
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[13422] | 110 | //no generic parameters => concrete types => check for type equality (ignore co- and contravariance)
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| 111 | //for example List<int> is only a List<int>, IParameter<IItem> is not a base type of IParameter<DoubleValue>
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| 112 | if (!baseTypeGenericArgument.IsGenericParameter && !subTypeGenericArgument.IsGenericParameter) {
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| 113 | if (baseTypeGenericArgument == subTypeGenericArgument) continue;
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| 114 | return false;
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| 115 | }
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[8571] | 116 |
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[13422] | 117 | //baseTypeGenericArgument is a concrete type and the subTypeGenericArgument is a generic parameter
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| 118 | //for example List<int> is not a base type of List<T>
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| 119 | if (!baseTypeGenericArgument.IsGenericParameter && subTypeGenericArgument.IsGenericParameter) return false;
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[8571] | 120 |
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[13422] | 121 | //baseTypeGenericArugment is a generic parameter and the subTypeGenericArgument is a concrete type => check type constraints
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| 122 | //for example IParameter<T> is a base type of IParameter<IItem> if all generic contraints on T are fulfilled
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| 123 | if (baseTypeGenericArgument.IsGenericParameter && !subTypeGenericArgument.IsGenericParameter) {
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| 124 | if (baseTypeGenericArgument.GenericParameterAttributes.HasFlag(GenericParameterAttributes.ReferenceTypeConstraint) &&
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| 125 | subTypeGenericArgument.IsValueType) return false;
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| 126 | if (baseTypeGenericArgument.GenericParameterAttributes.HasFlag(GenericParameterAttributes.DefaultConstructorConstraint) &&
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| 127 | subTypeGenericArgument.GetConstructor(Type.EmptyTypes) == null) return false;
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| 128 | if (baseTypeGenericArgument.GenericParameterAttributes.HasFlag(GenericParameterAttributes.NotNullableValueTypeConstraint)) {
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| 129 | if (!subTypeGenericArgument.IsValueType) return false;
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| 130 | if (subTypeGenericArgument.IsGenericType && subTypeGenericArgument.GetGenericTypeDefinition() == typeof(Nullable<>))
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| 131 | return false;
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| 132 | }
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| 133 |
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| 134 | //not assignable if the subTypeGenericArgument is not assignable to all of the constraints of the base type
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| 135 | if (baseTypeGenericArgument.GetGenericParameterConstraints().Any(baseTypeGenericParameterConstraint =>
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| 136 | !baseTypeGenericParameterConstraint.IsAssignableFrom(subTypeGenericArgument)))
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| 137 | return false;
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[8571] | 138 | }
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[13422] | 139 |
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| 140 | //both generic arguments are generic parameters => check type constraints
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| 141 | //for example IParameter<T> is a base type of IParameter<T>
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| 142 | if (baseTypeGenericArgument.IsGenericParameter && subTypeGenericArgument.IsGenericParameter) {
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| 143 | if (baseTypeGenericArgument.GenericParameterAttributes.HasFlag(GenericParameterAttributes.ReferenceTypeConstraint) &&
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| 144 | !subTypeGenericArgument.GenericParameterAttributes.HasFlag(GenericParameterAttributes.ReferenceTypeConstraint)) return false;
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| 145 | if (baseTypeGenericArgument.GenericParameterAttributes.HasFlag(GenericParameterAttributes.DefaultConstructorConstraint) &&
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| 146 | !subTypeGenericArgument.GenericParameterAttributes.HasFlag(GenericParameterAttributes.DefaultConstructorConstraint)) return false;
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| 147 | if (baseTypeGenericArgument.GenericParameterAttributes.HasFlag(GenericParameterAttributes.NotNullableValueTypeConstraint) &&
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| 148 | !subTypeGenericArgument.GenericParameterAttributes.HasFlag(GenericParameterAttributes.NotNullableValueTypeConstraint)) return false;
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| 149 |
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| 150 | //not assignable if any of the constraints is not assignable to the constraints of the base type
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| 151 | if (baseTypeGenericArgument.GetGenericParameterConstraints().Any(baseTypeGenericParameterConstraint => !subTypeGenericArgument.GetGenericParameterConstraints().Any(t => baseTypeGenericParameterConstraint.IsAssignableFrom(t)))) {
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| 152 | return false;
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| 153 | }
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| 154 | }
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[8571] | 155 | }
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| 156 | return true;
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| 157 | }
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| 158 | }
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| 159 | }
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