71 lines
3.5 KiB
C#
71 lines
3.5 KiB
C#
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using System;
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using System.Collections.Generic;
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using System.Linq.Expressions;
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namespace Umbraco.Core.Models.PublishedContent
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{
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/// <summary>
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/// Implements a strongly typed content model factory
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/// </summary>
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internal class PublishedContentModelFactoryImpl : IPublishedContentModelFactory
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{
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//private readonly Dictionary<string, ConstructorInfo> _constructors
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// = new Dictionary<string, ConstructorInfo>();
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private readonly Dictionary<string, Func<IPublishedContent, IPublishedContent>> _constructors
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= new Dictionary<string, Func<IPublishedContent, IPublishedContent>>();
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public PublishedContentModelFactoryImpl()
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{
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var types = PluginManager.Current.ResolveTypes<PublishedContentModel>();
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var ctorArgTypes = new[] { typeof(IPublishedContent) };
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foreach (var type in types)
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{
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if (type.Inherits<PublishedContentModel>() == false)
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throw new InvalidOperationException(string.Format("Type {0} is marked with PublishedContentModel attribute but does not inherit from PublishedContentExtended.", type.FullName));
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var constructor = type.GetConstructor(ctorArgTypes);
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if (constructor == null)
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throw new InvalidOperationException(string.Format("Type {0} is missing a public constructor with one argument of type IPublishedContent.", type.FullName));
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var attribute = type.GetCustomAttribute<PublishedContentModelAttribute>(false);
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var typeName = attribute == null ? type.Name : attribute.ContentTypeAlias;
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typeName = typeName.ToLowerInvariant();
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if (_constructors.ContainsKey(typeName))
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throw new InvalidOperationException(string.Format("More that one type want to be a model for content type {0}.", typeName));
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// should work everywhere, potentially slow?
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//_constructors[typeName] = constructor;
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// note: would it be even faster with a dynamic method?
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// here http://stackoverflow.com/questions/16363838/how-do-you-call-a-constructor-via-an-expression-tree-on-an-existing-object
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// but MediumTrust issue?
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// fixme - must make sure that works in medium trust
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// read http://boxbinary.com/2011/10/how-to-run-a-unit-test-in-medium-trust-with-nunitpart-three-umbraco-framework-testing/
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var exprArg = Expression.Parameter(typeof(IPublishedContent), "content");
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var exprNew = Expression.New(constructor, exprArg);
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var expr = Expression.Lambda<Func<IPublishedContent, IPublishedContent>>(exprNew, exprArg);
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var func = expr.Compile();
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_constructors[typeName] = func;
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}
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}
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public IPublishedContent CreateModel(IPublishedContent content)
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{
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// be case-insensitive
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var contentTypeAlias = content.DocumentTypeAlias.ToLowerInvariant();
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//ConstructorInfo constructor;
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//return _constructors.TryGetValue(contentTypeAlias, out constructor)
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// ? (IPublishedContent) constructor.Invoke(new object[] { content })
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// : content;
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Func<IPublishedContent, IPublishedContent> constructor;
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return _constructors.TryGetValue(contentTypeAlias, out constructor)
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? constructor(content)
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: content;
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}
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}
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}
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