TypeReference.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / DataEntityDesign / Design / System / Data / EntityModel / Emitters / TypeReference.cs / 1305376 / TypeReference.cs
                        

                        
                            //---------------------------------------------------------------------- 
// 
//      Copyright (c) Microsoft Corporation.  All rights reserved.
// 
// 
// @owner       [....]
// @backupOwner [....] 
//--------------------------------------------------------------------- 

using System; 
using System.CodeDom;
using System.Collections;
using System.Collections.Generic;
using System.Data.EntityModel.SchemaObjectModel; 
using System.Data.Common.Utils;
using System.Reflection; 
 

namespace System.Data.EntityModel.Emitters 
{
    /// 
    /// Summary description for TypeReferences.
    ///  
    internal class TypeReference
    { 
        #region Fields 
        internal static readonly Type ComplexTypeBaseClassType = typeof(System.Data.Objects.DataClasses.ComplexObject);
        internal static readonly Type EntityTypeBaseClassType = typeof(System.Data.Objects.DataClasses.EntityObject); 
        private const string IEntityWithRelationshipsTypeBaseClassName = "IEntityWithRelationships";
        private const string NewContextClassName = "ObjectContext";
        private const string EntitySetClassName = "EntitySet";
        private const string ObjectResultClassName = "ObjectResult"; 

        public const string FQMetaDataWorkspaceTypeName = "System.Data.Metadata.Edm.MetadataWorkspace"; 
 
        private static CodeTypeReference _byteArray;
        private static CodeTypeReference _dateTime; 
        private static CodeTypeReference _guid;
        private static CodeTypeReference _objectContext;
        private static CodeTypeReference _string;
        private readonly Memoizer _forTypeMemoizer; 
        private readonly Memoizer _nullableForTypeMemoizer;
        private readonly Memoizer, CodeTypeReference> _fromStringMemoizer; 
        private readonly Memoizer, CodeTypeReference> _fromStringGenericMemoizer; 
        #endregion
 
        #region Constructors
        internal TypeReference()
        {
            _forTypeMemoizer = new Memoizer(ComputeForType, null); 
            _fromStringMemoizer = new Memoizer, CodeTypeReference>(ComputeFromString, null);
            _nullableForTypeMemoizer = new Memoizer(ComputeNullableForType, null); 
            _fromStringGenericMemoizer = new Memoizer, CodeTypeReference>(ComputeFromStringGeneric, null); 
        }
        #endregion 

        #region Public Methods
        /// 
        /// Get TypeReference for a type represented by a Type object 
        /// 
        /// the type object 
        /// the associated TypeReference object 
        public CodeTypeReference ForType(Type type)
        { 
            return _forTypeMemoizer.Evaluate(type);
        }

        private CodeTypeReference ComputeForType(Type type) 
        {
            // we know that we can safely global:: qualify this because it was already 
            // compiled before we are emitting or else we wouldn't have a Type object 
            CodeTypeReference value = new CodeTypeReference(type, CodeTypeReferenceOptions.GlobalReference);
            return value; 
        }

        /// 
        /// Get TypeReference for a type represented by a Generic Type object. 
        /// We don't cache the TypeReference for generic type object since the type would be the same
        /// irresepective of the generic arguments. We could potentially cache it using both the type name 
        /// and generic type arguments. 
        /// 
        /// the generic type object 
        /// the associated TypeReference object
        public CodeTypeReference ForType(Type generic, CodeTypeReference argument)
        {
            // we know that we can safely global:: qualify this because it was already 
            // compiled before we are emitting or else we wouldn't have a Type object
            CodeTypeReference typeRef = new CodeTypeReference(generic, CodeTypeReferenceOptions.GlobalReference); 
            typeRef.TypeArguments.Add(argument); 
            return typeRef;
        } 


        /// 
        /// Get TypeReference for a type represented by a namespace quailifed string 
        /// 
        /// namespace qualified string 
        /// the TypeReference 
        public CodeTypeReference FromString(string type)
        { 
            return FromString(type, false);
        }

        ///  
        /// Get TypeReference for a type represented by a namespace quailifed string,
        /// with optional global qualifier 
        ///  
        /// namespace qualified string
        /// indicates whether the global qualifier should be added 
        /// the TypeReference
        public CodeTypeReference FromString(string type, bool addGlobalQualifier)
        {
            return _fromStringMemoizer.Evaluate(new KeyValuePair(type, addGlobalQualifier)); 
        }
 
        private CodeTypeReference ComputeFromString(KeyValuePair arguments) 
        {
            string type = arguments.Key; 
            bool addGlobalQualifier = arguments.Value;
            CodeTypeReference value;
            if (addGlobalQualifier)
            { 
                value = new CodeTypeReference(type, CodeTypeReferenceOptions.GlobalReference);
            } 
            else 
            {
                value = new CodeTypeReference(type); 
            }
            return value;
        }
 
        /// 
        /// Get TypeReference for a framework type 
        ///  
        /// unqualified name of the framework type
        /// the TypeReference 
        public CodeTypeReference AdoFrameworkType(string name)
        {
            return FromString(Utils.FQAdoFrameworkName(name), true);
        } 

        ///  
        /// Get TypeReference for a framework DataClasses type 
        /// 
        /// unqualified name of the framework DataClass type 
        /// the TypeReference
        public CodeTypeReference AdoFrameworkDataClassesType(string name)
        {
            return FromString(Utils.FQAdoFrameworkDataClassesName(name), true); 
        }
 
        ///  
        /// Get TypeReference for a framework Metadata Edm type
        ///  
        /// unqualified name of the framework metadata edm type
        /// the TypeReference
        public CodeTypeReference AdoFrameworkMetadataEdmType(string name)
        { 
            return FromString(Utils.FQAdoFrameworkMetadataEdmName(name), true);
        } 
 
        /// 
        /// Get TypeReference for a framework Entity Client type 
        /// 
        /// unqualified name of the framework type
        /// the TypeReference
        public CodeTypeReference AdoEntityClientType(string name) 
        {
            return FromString(Utils.FQAdoEntityClientName(name), true); 
        } 

        ///  
        /// Get TypeReference for a bound generic framework class
        /// 
        /// the name of the generic framework class
        /// the type parameter for the framework class 
        /// TypeReference for the bound framework class
        public CodeTypeReference AdoFrameworkGenericClass(string name, CodeTypeReference typeParameter) 
        { 
            return FrameworkGenericClass(Utils.AdoFrameworkNamespace, name, typeParameter);
        } 
        /// 
        /// Get TypeReference for a bound generic framework data class
        /// 
        /// the name of the generic framework data class 
        /// the type parameter for the framework data class
        /// TypeReference for the bound framework data class 
        public CodeTypeReference AdoFrameworkGenericDataClass(string name, CodeTypeReference typeParameter) 
        {
            return FrameworkGenericClass(Utils.AdoFrameworkDataClassesNamespace, name, typeParameter); 
        }

        /// 
        /// Get TypeReference for a bound generic framework class 
        /// 
        /// the namespace of the generic framework class 
        /// the name of the generic framework class 
        /// the type parameter for the framework class
        /// TypeReference for the bound framework class 
        private CodeTypeReference FrameworkGenericClass(string namespaceName, string name, CodeTypeReference typeParameter)
        {
            return _fromStringGenericMemoizer.Evaluate(new KeyValuePair(namespaceName + "." + name, typeParameter));
        } 

        private CodeTypeReference ComputeFromStringGeneric(KeyValuePair arguments) 
        { 
            string name = arguments.Key;
            CodeTypeReference typeParameter = arguments.Value; 
            CodeTypeReference typeRef = ComputeFromString(new KeyValuePair(name, true));
            typeRef.TypeArguments.Add(typeParameter);
            return typeRef;
        } 

        ///  
        /// Get TypeReference for a bound Nullable<T> 
        /// 
        /// Type of the Nullable<T> type parameter 
        /// TypeReference for a bound Nullable<T>
        public CodeTypeReference NullableForType(Type innerType)
        {
            return _nullableForTypeMemoizer.Evaluate(innerType); 
        }
 
        private CodeTypeReference ComputeNullableForType(Type innerType) 
        {
            // can't use FromString because it will return the same Generic type reference 
            // but it will already have a previous type parameter (because of caching)
            CodeTypeReference typeRef = new CodeTypeReference(typeof(System.Nullable<>), CodeTypeReferenceOptions.GlobalReference);
            typeRef.TypeArguments.Add(ForType(innerType));
            return typeRef; 
        }
 
        ///  
        /// Gets an ObjectResult of elementType CodeTypeReference.
        ///  
        public CodeTypeReference ObjectResult(CodeTypeReference elementType)
        {
            return AdoFrameworkGenericClass(ObjectResultClassName, elementType);
        } 

        #endregion 
 
        #region Public Properties
        ///  
        /// Gets a CodeTypeReference to the System.Byte[] type.
        /// 
        /// 
        public CodeTypeReference ByteArray 
        {
            get 
            { 
                if (_byteArray == null)
                    _byteArray = ForType(typeof(byte[])); 

                return _byteArray;
            }
        } 

        ///  
        /// Gets a CodeTypeReference object for the System.DateTime type. 
        /// 
        public CodeTypeReference DateTime 
        {
            get
            {
                if (_dateTime == null) 
                    _dateTime = ForType(typeof(System.DateTime));
                return _dateTime; 
            } 
        }
 
        /// 
        /// Gets a CodeTypeReference object for the System.Guid type.
        /// 
        public CodeTypeReference Guid 
        {
            get 
            { 
                if (_guid == null)
                    _guid = ForType(typeof(System.Guid)); 

                return _guid;
            }
        } 

        ///  
        /// TypeReference for the Framework's ObjectContext class 
        /// 
        public CodeTypeReference ObjectContext 
        {
            get
            {
                if (_objectContext == null) 
                    _objectContext = AdoFrameworkType(NewContextClassName);
 
                return _objectContext; 
            }
        } 

        /// 
        /// TypeReference for the Framework base class to types that can used in InlineObjectCollection
        ///  
        public CodeTypeReference ComplexTypeBaseClass
        { 
            get 
            {
                return ForType(ComplexTypeBaseClassType); 
            }
        }

 
        /// 
        /// TypeReference for the Framework base class for EntityTypes 
        ///  
        public CodeTypeReference EntityTypeBaseClass
        { 
            get
            {
                return ForType(EntityTypeBaseClassType);
            } 
        }
 
        ///  
        /// TypeReference for the Framework base class for IEntityWithRelationships
        ///  
        public CodeTypeReference IEntityWithRelationshipsTypeBaseClass
        {
            get
            { 
                return AdoFrameworkDataClassesType(IEntityWithRelationshipsTypeBaseClassName);
            } 
        } 

        ///  
        /// Gets a CodeTypeReference object for the System.String type.
        /// 
        public CodeTypeReference String
        { 
            get
            { 
                if (_string == null) 
                    _string = ForType(typeof(string));
                return _string; 
            }
        }
        #endregion
 
    }
} 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.

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