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/ 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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