ClrPerspective.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 / DataEntity / System / Data / Metadata / ClrPerspective.cs / 1305376 / ClrPerspective.cs
                        

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

namespace System.Data.Metadata.Edm 
{
    using System.Collections.Generic;
    using System.Data.Mapping;
    using System.Diagnostics; 

    ///  
    /// Internal helper class for query 
    /// 
    internal sealed class ClrPerspective : Perspective 
    {
        private EntityContainer _defaultContainer;

        #region Constructors 
        /// 
        /// Creates a new instance of perspective class so that query can work 
        /// ignorant of all spaces 
        /// 
        ///  
        internal ClrPerspective(MetadataWorkspace metadataWorkspace)
            : base(metadataWorkspace, DataSpace.CSpace)
        {
        } 
        #endregion //Constructors
 
        #region Methods 
        /// 
        /// Given a clrType attempt to return the corresponding target type from 
        /// the worksapce
        /// 
        /// The clr type to resolve
        /// an out param for the typeUsage to be resolved to 
        /// true if a TypeUsage can be found for the target type
        internal bool TryGetType(Type clrType, out TypeUsage outTypeUsage) 
        { 
            return TryGetTypeByName(clrType.FullName,
                                    false /*ignoreCase*/, 
                                    out outTypeUsage);
        }

        ///  
        /// Given the type in the target space and the member name in the source space,
        /// get the corresponding member in the target space 
        /// For e.g.  consider a Conceptual Type Foo with a member bar and a CLR type 
        /// XFoo with a member YBar. If one has a reference to Foo one can
        /// invoke GetMember(Foo,"YBar") to retrieve the member metadata for bar 
        /// 
        /// The type in the target perspective
        /// the name of the member in the source perspective
        /// true for case-insensitive lookup 
        /// returns the edmMember if a match is found
        /// true if a match is found, otherwise false 
        internal override bool TryGetMember(StructuralType type, String memberName, bool ignoreCase, out EdmMember outMember) 
        {
            outMember = null; 
            Map map = null;

            if (this.MetadataWorkspace.TryGetMap(type, DataSpace.OCSpace, out map))
            { 
                ObjectTypeMapping objectTypeMap = map as ObjectTypeMapping;
 
                if (objectTypeMap!=null) 
                {
                    ObjectMemberMapping objPropertyMapping = objectTypeMap.GetMemberMapForClrMember(memberName, ignoreCase); 
                    if (null != objPropertyMapping)
                    {
                        outMember = objPropertyMapping.EdmMember;
                        return true; 
                    }
                } 
            } 
            return false;
        } 

        /// 
        /// Look up a type in the target data space based upon the fullName
        ///  
        /// fullName
        /// true for case-insensitive lookup 
        /// The type usage object to return 
        /// True if the retrieval succeeded
        internal override bool TryGetTypeByName(string fullName, bool ignoreCase, out TypeUsage typeUsage) 
        {
            typeUsage = null;
            Map map = null;
 
            // From ClrPerspective, we should not allow anything from SSpace. So make sure that the CSpace type does not
            // have the Target attribute 
            if (this.MetadataWorkspace.TryGetMap(fullName, DataSpace.OSpace, ignoreCase, DataSpace.OCSpace, out map)) 
            {
                // Check if it's primitive type, if so, then use the MetadataWorkspace to get the mapped primitive type 
                if (map.EdmItem.BuiltInTypeKind == BuiltInTypeKind.PrimitiveType)
                {
                    // Reassign the variable with the provider primitive type, then create the type usage
                    PrimitiveType primitiveType = this.MetadataWorkspace.GetMappedPrimitiveType(((PrimitiveType)map.EdmItem).PrimitiveTypeKind, DataSpace.CSpace); 
                    if (primitiveType != null)
                    { 
                        typeUsage = EdmProviderManifest.Instance.GetCanonicalModelTypeUsage(primitiveType.PrimitiveTypeKind); 
                    }
                } 
                else
                {
                    Debug.Assert(((GlobalItem)map.EdmItem).DataSpace == DataSpace.CSpace);
                    typeUsage = GetMappedTypeUsage(map); 
                }
            } 
 
            return (null != typeUsage);
        } 

        /// 
        /// get the default container
        ///  
        /// The default container
        internal override EntityContainer GetDefaultContainer() 
        { 
            return _defaultContainer;
        } 

        internal void SetDefaultContainer(string defaultContainerName)
        {
            EntityContainer container = null; 
            if (!String.IsNullOrEmpty(defaultContainerName))
            { 
                if (!MetadataWorkspace.TryGetEntityContainer(defaultContainerName, DataSpace.CSpace, out container)) 
                {
                    throw EntityUtil.InvalidDefaultContainerName("defaultContainerName", defaultContainerName); 
                }
            }
            _defaultContainer = container;
        } 

        ///  
        /// Given a map, dereference the EdmItem, ensure that it is 
        /// an EdmType and return a TypeUsage for the type, otherwise
        /// return null. 
        /// 
        /// The OC map to use to get the EdmType
        /// A TypeUsage for the mapped EdmType or null if no EdmType was mapped
        private static TypeUsage GetMappedTypeUsage(Map map) 
        {
            TypeUsage typeUsage = null; 
            if (null != map) 
            {
                MetadataItem item = map.EdmItem; 
                EdmType edmItem = item as EdmType;
                if (null != item && edmItem!=null)
                {
                    typeUsage = TypeUsage.Create(edmItem); 
                }
            } 
            return typeUsage; 
        }
        #endregion 
    }
}

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

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