98 lines
3.7 KiB
C#
98 lines
3.7 KiB
C#
// This file is part of YamlDotNet - A .NET library for YAML.
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// Copyright (c) Antoine Aubry and contributors
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy of
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// this software and associated documentation files (the "Software"), to deal in
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// the Software without restriction, including without limitation the rights to
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// use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
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// of the Software, and to permit persons to whom the Software is furnished to do
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// so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in all
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// copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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// SOFTWARE.
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using System;
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using System.Collections;
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using System.Collections.Generic;
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namespace YamlDotNet.Serialization.ObjectFactories
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{
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/// <summary>
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/// Creates objects using Activator.CreateInstance.
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/// </summary>
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public sealed class DefaultObjectFactory : IObjectFactory
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{
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private readonly Dictionary<Type, Type> DefaultGenericInterfaceImplementations = new Dictionary<Type, Type>
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{
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{ typeof(IEnumerable<>), typeof(List<>) },
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{ typeof(ICollection<>), typeof(List<>) },
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{ typeof(IList<>), typeof(List<>) },
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{ typeof(IDictionary<,>), typeof(Dictionary<,>) }
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};
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private readonly Dictionary<Type, Type> DefaultNonGenericInterfaceImplementations = new Dictionary<Type, Type>
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{
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{ typeof(IEnumerable), typeof(List<object>) },
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{ typeof(ICollection), typeof(List<object>) },
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{ typeof(IList), typeof(List<object>) },
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{ typeof(IDictionary), typeof(Dictionary<object, object>) }
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};
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public DefaultObjectFactory()
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{
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}
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public DefaultObjectFactory(IDictionary<Type, Type> mappings)
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{
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foreach (var pair in mappings)
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{
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if (!pair.Key.IsAssignableFrom(pair.Value))
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{
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throw new InvalidOperationException($"Type '{pair.Value}' does not implement type '{pair.Key}'.");
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}
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DefaultNonGenericInterfaceImplementations.Add(pair.Key, pair.Value);
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}
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}
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public object Create(Type type)
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{
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if (type.IsInterface())
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{
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if (type.IsGenericType())
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{
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if (DefaultGenericInterfaceImplementations.TryGetValue(type.GetGenericTypeDefinition(), out var implementationType))
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{
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type = implementationType.MakeGenericType(type.GetGenericArguments());
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}
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}
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else
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{
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if (DefaultNonGenericInterfaceImplementations.TryGetValue(type, out var implementationType))
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{
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type = implementationType;
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}
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}
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}
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try
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{
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return Activator.CreateInstance(type)!;
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}
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catch (Exception err)
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{
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var message = $"Failed to create an instance of type '{type.FullName}'.";
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throw new InvalidOperationException(message, err);
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}
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}
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}
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}
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