TypeUtils.cs source code in C# .NET

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Code:

                         / Net / Net / 3.5.50727.3053 / DEVDIV / depot / DevDiv / releases / Orcas / SP / ndp / fx / src / DataEntity / System / Data / Query / PlanCompiler / TypeUtils.cs / 2 / TypeUtils.cs
                        

                        
                            //---------------------------------------------------------------------- 
// 
//      Copyright (c) Microsoft Corporation.  All rights reserved.
// 
// 
// @owner  [....], [....]
//--------------------------------------------------------------------- 
 
using System;
using System.Collections.Generic; 
//using System.Diagnostics; // Please use PlanCompiler.Assert instead of Debug.Assert in this class...
using System.Globalization;

using System.Data.Common; 
using md = System.Data.Metadata.Edm;
 
// 
// This module contains a few utility functions that make it easier to operate
// with type metadata 
//

namespace System.Data.Query.PlanCompiler
{ 
    /// 
    /// This class is used as a Comparer for Types all through the PlanCompiler. 
    /// It has a pretty strict definition of type equality - which pretty much devolves 
    /// to equality of the "Identity" of the Type (not the TypeUsage).
    /// 
    /// NOTE: Unlike other parts of the query pipeline, record types follow
    /// a much stricter equality condition here - the field names must be the same, and
    /// the field types must be equal.
    /// 
    /// NOTE: Primitive types are considered equal, if their Identities are equal. This doesn't
    /// take into account any of the facets that are represented external to the type (size, for instance). 
    /// Again, this is different from other parts of  the query pipeline; and we're much stricter here 
    ///
    ///  
    sealed internal class TypeUsageEqualityComparer : IEqualityComparer
    {
        private TypeUsageEqualityComparer() { }
        internal static readonly TypeUsageEqualityComparer Instance = new TypeUsageEqualityComparer(); 

        #region IEqualityComparer Members 
 
        public bool Equals(System.Data.Metadata.Edm.TypeUsage x, System.Data.Metadata.Edm.TypeUsage y)
        { 
            if (x == null || y == null)
            {
                return false;
            } 

            return TypeUsageEqualityComparer.Equals(x.EdmType, y.EdmType); 
        } 

        public int GetHashCode(System.Data.Metadata.Edm.TypeUsage obj) 
        {
            return obj.EdmType.Identity.GetHashCode();
        }
 
        #endregion
 
        internal static bool Equals(md.EdmType x, md.EdmType y) 
        {
            return x.Identity.Equals(y.Identity); 
        }
    }

    internal static class TypeUtils 
    {
        ///  
        /// Is this type a UDT? (ie) a structural type supported by the store 
        /// 
        /// the type in question 
        /// true, if the type was a UDT
        internal static bool IsUdt(md.TypeUsage type)
        {
            return IsUdt(type.EdmType); 
        }
 
        ///  
        /// Is this type a UDT? (ie) a structural type supported by the store
        ///  
        /// the type in question
        /// true, if the type was a UDT
        internal static bool IsUdt(md.EdmType type)
        { 
#if UDT_SUPPORT
            // Ideally this should be as simple as: 
            // return TypeUsage.HasExtendedAttribute(type, MetadataConstants.UdtAttribute); 
            // The definition below is 'Type is a ComplexType defined in the store'.
            return (BuiltInTypeKind.ComplexType == type.BuiltInTypeKind && 
                    TypeHelpers.HasExtendedAttribute(type, MetadataConstants.TargetAttribute));
#else
            return false;
#endif 
        }
 
        ///  
        /// Is this a structured type?
        /// Note: Structured, in this context means structured outside the server. 
        /// UDTs for instance, are considered to be scalar types - all WinFS types,
        /// would by this argument, be scalar types.
        /// 
        /// The type to check 
        /// true, if the type is a structured type
        internal static bool IsStructuredType(md.TypeUsage type) 
        { 
            return (md.TypeSemantics.IsReferenceType(type) ||
                    md.TypeSemantics.IsRowType(type) || 
                    md.TypeSemantics.IsEntityType(type) ||
                    md.TypeSemantics.IsRelationshipType(type) ||
                    (md.TypeSemantics.IsComplexType(type) && !IsUdt(type)));
        } 

        ///  
        /// Is this type a collection type? 
        /// 
        /// the current type 
        /// true, if this is a collection type
        internal static bool IsCollectionType(md.TypeUsage type)
        {
            return md.TypeSemantics.IsCollectionType(type); 
        }
 
        ///  
        /// Create a new collection type based on the supplied element type
        ///  
        /// element type of the collection
        /// the new collection type
        internal static md.TypeUsage CreateCollectionType(md.TypeUsage elementType)
        { 
            return TypeHelpers.CreateCollectionTypeUsage(elementType);
        } 
    } 
}

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
//---------------------------------------------------------------------- 
// 
//      Copyright (c) Microsoft Corporation.  All rights reserved.
// 
// 
// @owner  [....], [....]
//--------------------------------------------------------------------- 
 
using System;
using System.Collections.Generic; 
//using System.Diagnostics; // Please use PlanCompiler.Assert instead of Debug.Assert in this class...
using System.Globalization;

using System.Data.Common; 
using md = System.Data.Metadata.Edm;
 
// 
// This module contains a few utility functions that make it easier to operate
// with type metadata 
//

namespace System.Data.Query.PlanCompiler
{ 
    /// 
    /// This class is used as a Comparer for Types all through the PlanCompiler. 
    /// It has a pretty strict definition of type equality - which pretty much devolves 
    /// to equality of the "Identity" of the Type (not the TypeUsage).
    /// 
    /// NOTE: Unlike other parts of the query pipeline, record types follow
    /// a much stricter equality condition here - the field names must be the same, and
    /// the field types must be equal.
    /// 
    /// NOTE: Primitive types are considered equal, if their Identities are equal. This doesn't
    /// take into account any of the facets that are represented external to the type (size, for instance). 
    /// Again, this is different from other parts of  the query pipeline; and we're much stricter here 
    ///
    ///  
    sealed internal class TypeUsageEqualityComparer : IEqualityComparer
    {
        private TypeUsageEqualityComparer() { }
        internal static readonly TypeUsageEqualityComparer Instance = new TypeUsageEqualityComparer(); 

        #region IEqualityComparer Members 
 
        public bool Equals(System.Data.Metadata.Edm.TypeUsage x, System.Data.Metadata.Edm.TypeUsage y)
        { 
            if (x == null || y == null)
            {
                return false;
            } 

            return TypeUsageEqualityComparer.Equals(x.EdmType, y.EdmType); 
        } 

        public int GetHashCode(System.Data.Metadata.Edm.TypeUsage obj) 
        {
            return obj.EdmType.Identity.GetHashCode();
        }
 
        #endregion
 
        internal static bool Equals(md.EdmType x, md.EdmType y) 
        {
            return x.Identity.Equals(y.Identity); 
        }
    }

    internal static class TypeUtils 
    {
        ///  
        /// Is this type a UDT? (ie) a structural type supported by the store 
        /// 
        /// the type in question 
        /// true, if the type was a UDT
        internal static bool IsUdt(md.TypeUsage type)
        {
            return IsUdt(type.EdmType); 
        }
 
        ///  
        /// Is this type a UDT? (ie) a structural type supported by the store
        ///  
        /// the type in question
        /// true, if the type was a UDT
        internal static bool IsUdt(md.EdmType type)
        { 
#if UDT_SUPPORT
            // Ideally this should be as simple as: 
            // return TypeUsage.HasExtendedAttribute(type, MetadataConstants.UdtAttribute); 
            // The definition below is 'Type is a ComplexType defined in the store'.
            return (BuiltInTypeKind.ComplexType == type.BuiltInTypeKind && 
                    TypeHelpers.HasExtendedAttribute(type, MetadataConstants.TargetAttribute));
#else
            return false;
#endif 
        }
 
        ///  
        /// Is this a structured type?
        /// Note: Structured, in this context means structured outside the server. 
        /// UDTs for instance, are considered to be scalar types - all WinFS types,
        /// would by this argument, be scalar types.
        /// 
        /// The type to check 
        /// true, if the type is a structured type
        internal static bool IsStructuredType(md.TypeUsage type) 
        { 
            return (md.TypeSemantics.IsReferenceType(type) ||
                    md.TypeSemantics.IsRowType(type) || 
                    md.TypeSemantics.IsEntityType(type) ||
                    md.TypeSemantics.IsRelationshipType(type) ||
                    (md.TypeSemantics.IsComplexType(type) && !IsUdt(type)));
        } 

        ///  
        /// Is this type a collection type? 
        /// 
        /// the current type 
        /// true, if this is a collection type
        internal static bool IsCollectionType(md.TypeUsage type)
        {
            return md.TypeSemantics.IsCollectionType(type); 
        }
 
        ///  
        /// Create a new collection type based on the supplied element type
        ///  
        /// element type of the collection
        /// the new collection type
        internal static md.TypeUsage CreateCollectionType(md.TypeUsage elementType)
        { 
            return TypeHelpers.CreateCollectionTypeUsage(elementType);
        } 
    } 
}

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

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