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CodeGeneratorsLocator.cs
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CodeGeneratorsLocator.cs
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// Copyright (c) .NET Foundation. All rights reserved.
// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
using System;
using System.Collections.Generic;
using System.Globalization;
using System.Linq;
using System.Reflection;
using Microsoft.VisualStudio.Web.CodeGeneration.Core;
namespace Microsoft.VisualStudio.Web.CodeGeneration
{
public class CodeGeneratorsLocator : ICodeGeneratorLocator
{
private readonly ICodeGeneratorAssemblyProvider _assemblyProvider;
private readonly IServiceProvider _serviceProvider;
public CodeGeneratorsLocator(
IServiceProvider serviceProvider,
ICodeGeneratorAssemblyProvider assemblyProvider)
{
if (serviceProvider == null)
{
throw new ArgumentNullException(nameof(serviceProvider));
}
if (assemblyProvider == null)
{
throw new ArgumentNullException(nameof(assemblyProvider));
}
_serviceProvider = serviceProvider;
_assemblyProvider = assemblyProvider;
}
public CodeGeneratorDescriptor GetCodeGenerator(string codeGeneratorName)
{
if (codeGeneratorName == null)
{
throw new ArgumentNullException(nameof(codeGeneratorName));
}
var candidates = CodeGenerators
.Where(gen => string.Equals(gen.Name, codeGeneratorName, StringComparison.OrdinalIgnoreCase));
var count = candidates.Count();
if (count == 0)
{
throw new InvalidOperationException(
string.Format(CultureInfo.CurrentCulture,
MessageStrings.CodeGeneratorNotFound,
codeGeneratorName));
}
if (count > 1)
{
throw new InvalidOperationException(
string.Format(CultureInfo.CurrentCulture,
MessageStrings.MultipleCodeGeneratorsFound,
codeGeneratorName));
}
return candidates.First();
}
public IEnumerable<CodeGeneratorDescriptor> CodeGenerators
{
get
{
var descriptors = new List<CodeGeneratorDescriptor>();
foreach (var assembly in _assemblyProvider.CandidateAssemblies)
{
descriptors.AddRange(assembly
.DefinedTypes
.Where(IsCodeGenerator)
.Select(typeInfo => DescriptorFromTypeInfo(typeInfo)));
}
return descriptors;
}
}
private CodeGeneratorDescriptor DescriptorFromTypeInfo(TypeInfo typeInfo)
{
if (typeInfo == null)
{
throw new ArgumentNullException(nameof(typeInfo));
}
return new CodeGeneratorDescriptor(typeInfo, _serviceProvider);
}
private bool IsCodeGenerator(TypeInfo typeInfo)
{
if (typeInfo == null)
{
throw new ArgumentNullException(nameof(typeInfo));
}
if (!typeInfo.IsClass ||
typeInfo.IsAbstract ||
typeInfo.ContainsGenericParameters)
{
return false;
}
return typeInfo.Name.EndsWith("CodeGenerator", StringComparison.OrdinalIgnoreCase) ||
typeof(ICodeGenerator).GetTypeInfo().IsAssignableFrom(typeInfo);
}
}
}