91 lines
3.3 KiB
C#
91 lines
3.3 KiB
C#
//---------------------------------------------------------------------
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// <copyright file="MetadataAssemblyHelper.cs" company="Microsoft">
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// Copyright (c) Microsoft Corporation. All rights reserved.
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// </copyright>
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//
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// @owner Microsoft
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// @backupOwner Microsoft
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//---------------------------------------------------------------------
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using System.Reflection;
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using System.Collections.Generic;
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using System.Diagnostics;
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using System.Data.Common.Utils;
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namespace System.Data.Metadata.Edm
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{
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internal static class MetadataAssemblyHelper
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{
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static byte [] EcmaPublicKeyToken = System.Data.EntityModel.SchemaObjectModel.ScalarType.ConvertToByteArray(AssemblyRef.EcmaPublicKey);
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static byte [] MsPublicKeyToken = System.Data.EntityModel.SchemaObjectModel.ScalarType.ConvertToByteArray(AssemblyRef.MicrosoftPublicKey);
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private static Memoizer<Assembly, bool> _filterAssemblyCacheByAssembly = new Memoizer<Assembly, bool>(MetadataAssemblyHelper.ComputeShouldFilterAssembly, EqualityComparer<Assembly>.Default);
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internal static Assembly SafeLoadReferencedAssembly(AssemblyName assemblyName)
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{
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Assembly assembly = null;
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try
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{
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assembly = Assembly.Load(assemblyName);
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}
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catch (System.IO.FileNotFoundException)
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{
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// See 552932: ObjectItemCollection: fails on referenced assemblies that are not available
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}
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return assembly;
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}
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private static bool ComputeShouldFilterAssembly(Assembly assembly)
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{
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AssemblyName assemblyName = new AssemblyName(assembly.FullName);
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return ShouldFilterAssembly(assemblyName);
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}
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internal static bool ShouldFilterAssembly(Assembly assembly)
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{
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return _filterAssemblyCacheByAssembly.Evaluate(assembly);
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}
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/// <summary>Is the assembly and its referened assemblies not expected to have any metadata</summary>
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private static bool ShouldFilterAssembly(AssemblyName assemblyName)
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{
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return (ArePublicKeyTokensEqual(assemblyName.GetPublicKeyToken(), EcmaPublicKeyToken) ||
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ArePublicKeyTokensEqual(assemblyName.GetPublicKeyToken(), MsPublicKeyToken));
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}
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private static bool ArePublicKeyTokensEqual(byte [] left, byte [] right)
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{
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// some assemblies don't have public keys
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if (left.Length != right.Length)
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{
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return false;
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}
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for (int i = 0; i < left.Length; i++)
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{
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if (left[i] != right[i])
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{
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return false;
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}
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}
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return true;
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}
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internal static IEnumerable<Assembly> GetNonSystemReferencedAssemblies(Assembly assembly)
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{
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foreach (AssemblyName name in assembly.GetReferencedAssemblies())
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{
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if (!ShouldFilterAssembly(name))
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{
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Assembly referenceAssembly = SafeLoadReferencedAssembly(name);
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if(referenceAssembly != null )
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{
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yield return referenceAssembly;
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}
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}
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}
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}
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}
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}
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