ObjectItemAssemblyLoader.cs source code in C# .NET

                        Code:
                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / DataEntity / System / Data / Metadata / ObjectLayer / ObjectItemAssemblyLoader.cs / 1305376 / ObjectItemAssemblyLoader.cs
                        
                        
                            //---------------------------------------------------------------------- 
// 
//      Copyright (c) Microsoft Corporation.  All rights reserved.
// 
// 
// @owner       [....]
// @backupOwner [....] 
//--------------------------------------------------------------------- 

 
using System.Collections.Generic;
using System.Diagnostics;
using System.Reflection;
using System.Data.Entity; 

namespace System.Data.Metadata.Edm 
{ 
    internal abstract class ObjectItemAssemblyLoader
    { 
        protected const BindingFlags PropertyReflectionBindingFlags = BindingFlags.DeclaredOnly |
                                                                     BindingFlags.Instance |
                                                                     BindingFlags.Public |
                                                                     BindingFlags.NonPublic; 

        private readonly ObjectItemLoadingSessionData _sessionData; 
        private Assembly _assembly; 
        private AssemblyCacheEntry _cacheEntry;
 
        protected ObjectItemAssemblyLoader(Assembly assembly, AssemblyCacheEntry cacheEntry, ObjectItemLoadingSessionData sessionData)
        {
            _assembly = assembly;
            _cacheEntry = cacheEntry; 
            _sessionData = sessionData;
        } 
 
        internal virtual void Load()
        { 
            AddToAssembliesLoaded();

            LoadTypesFromAssembly();
 
            AddToKnownAssemblies();
 
            LoadClosureAssemblies(); 
        }
 
        protected abstract void AddToAssembliesLoaded();
        protected abstract void LoadTypesFromAssembly();
        protected virtual void LoadClosureAssemblies()
        { 
            LoadAssemblies(CacheEntry.ClosureAssemblies, SessionData);
        } 
 
        internal virtual void OnLevel1SessionProcessing() { }
        internal virtual void OnLevel2SessionProcessing() { } 

        internal static ObjectItemAssemblyLoader CreateLoader(Assembly assembly, ObjectItemLoadingSessionData sessionData)
        {
            ImmutableAssemblyCacheEntry cacheEntry; 

            // KnownAssembly -> NoOp 
            // Inside the LockedAssemblyCache means it is an attribute based assembly -> Cachedassembly 
            // Inside the OcCache on EdmItemCollection -> cachedassembly
            // If none of above, setup the LoaderFactory based on the current assembly and EdmItemCollection 
            if (sessionData.KnownAssemblies.Contains(assembly, sessionData.ObjectItemAssemblyLoaderFactory, sessionData.EdmItemCollection))
            {
                return new ObjectItemNoOpAssemblyLoader(assembly, sessionData);
            } 
            else if (sessionData.LockedAssemblyCache.TryGetValue(assembly, out cacheEntry))
            { 
                if (sessionData.ObjectItemAssemblyLoaderFactory == null) 
                {
                    if (cacheEntry.TypesInAssembly.Count != 0) 
                    {
                        // we are loading based on attributes now
                        sessionData.ObjectItemAssemblyLoaderFactory = ObjectItemAttributeAssemblyLoader.Create;
                    } 
                    // if types in assembly are 0, don't commit to any loader yet
                } 
                else if (sessionData.ObjectItemAssemblyLoaderFactory != ObjectItemAttributeAssemblyLoader.Create) 
                {
                    // we were loading in convention mode, and ran into an assembly that can't be loaded by convention 
                    // we know this because all cached assemblies are attribute based at the moment.
                    sessionData.EdmItemErrors.Add(new EdmItemError(Strings.Validator_OSpace_Convention_AttributeAssemblyReferenced(assembly.FullName), null));
                }
                return new ObjectItemCachedAssemblyLoader(assembly, cacheEntry, sessionData); 
            }
            else if (sessionData.EdmItemCollection != null && 
                    sessionData.EdmItemCollection.ConventionalOcCache.TryGetConventionalOcCacheFromAssemblyCache( 
                        assembly, out cacheEntry))
            { 
                sessionData.ObjectItemAssemblyLoaderFactory = ObjectItemConventionAssemblyLoader.Create;
                return new ObjectItemCachedAssemblyLoader(assembly, cacheEntry, sessionData);
            }
            else if (sessionData.ObjectItemAssemblyLoaderFactory == null) 
            {
                if (ObjectItemAttributeAssemblyLoader.IsSchemaAttributePresent(assembly)) 
                { 
                    sessionData.ObjectItemAssemblyLoaderFactory = ObjectItemAttributeAssemblyLoader.Create;
                } 
                else if (ObjectItemConventionAssemblyLoader.SessionContainsConventionParameters(sessionData))
                {
                    sessionData.ObjectItemAssemblyLoaderFactory = ObjectItemConventionAssemblyLoader.Create;
                } 
            }
 
            if (sessionData.ObjectItemAssemblyLoaderFactory != null) 
            {
                return sessionData.ObjectItemAssemblyLoaderFactory(assembly, sessionData); 
            }

            return new ObjectItemNoOpAssemblyLoader(assembly, sessionData);
 
        }
 
        internal static bool IsAttributeLoader(object loaderCookie) 
        {
            Debug.Assert(loaderCookie == null || loaderCookie is Func, "Non loader cookie passed in"); 
            return IsAttributeLoader(loaderCookie as Func);
        }

        internal static bool IsAttributeLoader(Func loaderFactory) 
        {
            if (loaderFactory == null) 
            { 
                return false;
            } 

            return loaderFactory == ObjectItemAttributeAssemblyLoader.Create;
        }
 
        internal static bool IsConventionLoader(Func loaderFactory)
        { 
            if (loaderFactory == null) 
            {
                return false; 
            }

            return loaderFactory == ObjectItemConventionAssemblyLoader.Create;
        } 

        protected virtual void AddToKnownAssemblies() 
        { 
            Debug.Assert(!_sessionData.KnownAssemblies.Contains(_assembly, SessionData.ObjectItemAssemblyLoaderFactory, _sessionData.EdmItemCollection), "This assembly must not be present in the list of known assemblies");
            _sessionData.KnownAssemblies.Add(_assembly, new KnownAssemblyEntry(CacheEntry, SessionData.EdmItemCollection != null)); 
        }

        protected static void LoadAssemblies(IEnumerable assemblies, ObjectItemLoadingSessionData sessionData)
        { 
            foreach (Assembly assembly in assemblies)
            { 
                ObjectItemAssemblyLoader loader = ObjectItemAssemblyLoader.CreateLoader(assembly, sessionData); 
                loader.Load();
            } 
        }

        protected bool TryGetPrimitiveType(Type type, out bool nullable, out PrimitiveType primitiveType)
        { 
            if (type.IsGenericType && type.GetGenericTypeDefinition() == typeof(Nullable<>))
            { 
                nullable = true; 
                type = type.GetGenericArguments()[0];
            } 
            else
            {
                nullable = !type.IsValueType;
            } 

            return ClrProviderManifest.Instance.TryGetPrimitiveType(type, out primitiveType); 
        } 

 

        protected ObjectItemLoadingSessionData SessionData { get { return _sessionData; } }
        protected Assembly SourceAssembly { get { return _assembly; } }
        protected AssemblyCacheEntry CacheEntry { get { return _cacheEntry; } } 

    } 
} 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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ObjectItemAssemblyLoader.cs source code in C# .NET

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