TypeReference.cs source code in C# .NET

                        Code:
                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / DataWeb / Design / system / Data / EntityModel / Emitters / TypeReference.cs / 1305376 / TypeReference.cs
                        
                        
                            //---------------------------------------------------------------------- 
// 
//      Copyright (c) Microsoft Corporation.  All rights reserved.
// 
// 
// @owner       [....]
// @backupOwner [....] 
//--------------------------------------------------------------------- 

using System.CodeDom; 
using System.Collections.Generic;
using System.Data.Common.Utils;

namespace System.Data.EntityModel.Emitters 
{
    ///  
    /// Summary description for TypeReferences. 
    /// 
    internal class TypeReference 
    {
        #region Fields
        internal static readonly Type ObjectContextBaseClassType = typeof(System.Data.Services.Client.DataServiceContext);
 
        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 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, params 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);
            if ((null != argument) && (0 < argument.Length)) 
            { 
                typeRef.TypeArguments.AddRange(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.WebFrameworkNamespace + "." + 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.WebFrameworkNamespace, 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 
        public CodeTypeReference FrameworkGenericClass(string namespaceName, string name, CodeTypeReference typeParameter)
        { 
            return FrameworkGenericClass(namespaceName + "." + name, typeParameter);
        }

        ///  
        /// Get TypeReference for a bound generic framework class
        ///  
        /// the fully qualified name of the generic framework class 
        /// the type parameter for the framework class
        /// TypeReference for the bound framework class 
        public CodeTypeReference FrameworkGenericClass(string fullname, CodeTypeReference typeParameter)
        {
            return _fromStringGenericMemoizer.Evaluate(new KeyValuePair(fullname, 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; 
        }
 
        #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("DataServiceContext"); 
                }
 
                return _objectContext;
            }
        }
 
        #endregion
    } 
} 

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

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