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//---------------------------------------------------------------------
// <copyright file="ClrPerspective.cs" company="Microsoft">
// Copyright (c) Microsoft Corporation. All rights reserved.
// </copyright>
//
// @owner Microsoft
// @backupOwner Microsoft
//---------------------------------------------------------------------
namespace System.Data.Metadata.Edm
{
using System.Collections.Generic;
using System.Data.Mapping;
using System.Diagnostics;
/// <summary>
/// Internal helper class for query
/// </summary>
internal sealed class ClrPerspective : Perspective
{
private EntityContainer _defaultContainer;
#region Constructors
/// <summary>
/// Creates a new instance of perspective class so that query can work
/// ignorant of all spaces
/// </summary>
/// <param name="metadataWorkspace"></param>
internal ClrPerspective(MetadataWorkspace metadataWorkspace)
: base(metadataWorkspace, DataSpace.CSpace)
{
}
#endregion //Constructors
#region Methods
/// <summary>
/// Given a clrType attempt to return the corresponding target type from
/// the worksapce
/// </summary>
/// <param name="clrType">The clr type to resolve</param>
/// <param name="outTypeUsage">an out param for the typeUsage to be resolved to</param>
/// <returns>true if a TypeUsage can be found for the target type</returns>
internal bool TryGetType(Type clrType, out TypeUsage outTypeUsage)
{
return TryGetTypeByName(clrType.FullName,
false /*ignoreCase*/,
out outTypeUsage);
}
/// <summary>
/// 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
/// </summary>
/// <param name="type">The type in the target perspective</param>
/// <param name="memberName">the name of the member in the source perspective</param>
/// <param name="ignoreCase">true for case-insensitive lookup</param>
/// <param name="outMember">returns the edmMember if a match is found</param>
/// <returns>true if a match is found, otherwise false</returns>
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;
}
/// <summary>
/// Look up a type in the target data space based upon the fullName
/// </summary>
/// <param name="fullName">fullName</param>
/// <param name="ignoreCase">true for case-insensitive lookup</param>
/// <param name="typeUsage">The type usage object to return</param>
/// <returns>True if the retrieval succeeded</returns>
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);
}
/// <summary>
/// get the default container
/// </summary>
/// <returns>The default container</returns>
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;
}
/// <summary>
/// Given a map, dereference the EdmItem, ensure that it is
/// an EdmType and return a TypeUsage for the type, otherwise
/// return null.
/// </summary>
/// <param name="map">The OC map to use to get the EdmType</param>
/// <returns>A TypeUsage for the mapped EdmType or null if no EdmType was mapped</returns>
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
}
}
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