TypeConstant.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 / Map / ViewGeneration / Structures / TypeConstant.cs / 1305376 / TypeConstant.cs

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

using System.Text; 
using System.Collections.Generic;
using System.Data.Mapping.ViewGeneration.CqlGeneration;
using System.Data.Common;
using System.Data.Common.Utils; 
using System.Data.Metadata.Edm;
using System.Diagnostics; 
 
namespace System.Data.Mapping.ViewGeneration.Structures
{ 

    // A constant for storing type values, e.g., a type constant is used to
    // denotes (say) a Person type, Address type, etc. It essentially
    // encapsulates a CDM Type 
    internal class TypeConstant : Constant
    { 
 
        #region Constructor
        // effects: Creates a type constant corresponding to "type" 
        internal TypeConstant(EdmType type)
        {
            m_cdmType = type;
        } 
        #endregion
 
        #region Fields 
        // The CDM type denoted by this type constant
        private EdmType m_cdmType; 
        #endregion

        #region Properties
        // effects: Returns the CDM type corresponding to this 
        internal EdmType CdmType
        { 
            get { return m_cdmType; } 
        }
        #endregion 

        #region Methods
        // effects: Given a projectedSlot that contributes to outputMember in
        // the output extent view, generates a constructor expression for 
        // outputMember's type, i.e, an expression of the form "Type(....)"
        // If refscope is non-null, instead of constructing an Entity or 
        // Complex type, constructs a reference 
        internal override StringBuilder AsCql(StringBuilder builder, MemberPath outputMember, string blockAlias)
        { 

            // Gather the fields for a constructor or a Ref expression
            List fields = new List();
            EntitySet refScope = outputMember.GetScopeOfRelationEnd(); 
            EntityType refEntityType = null;
 
            if (refScope != null) 
            {
                // Construct a scoped reference: CreateRef(CPerson1, row(pid1, pid2)) 
                EntityType entityType = refScope.ElementType;
                refEntityType = (EntityType)(((RefType)outputMember.EdmType).ElementType);
                builder.Append("CreateRef(");
                CqlWriter.AppendEscapedQualifiedName(builder, refScope.EntityContainer.Name, refScope.Name); 
                builder.Append(", row(");
                foreach (EdmMember keyMember in entityType.KeyMembers) 
                { 
                    // Given the member, we need its aliased name
                    MemberPath memberPath = new MemberPath(outputMember, keyMember); 
                    string fullFieldAlias = CqlWriter.GetQualifiedName(blockAlias, memberPath.CqlFieldAlias);
                    fields.Add(fullFieldAlias);
                }
            } 
            else
            { 
                // Construct an entity/complex/Association type in the Members order 
                // for fields: CPerson(CPerson1_Pid, CPerson1_Name)
                // It better be a structural type 
                StructuralType structuralType = (StructuralType)m_cdmType;
                foreach (EdmMember member in Helper.GetAllStructuralMembers(structuralType))
                {
                    // Given the member, we need its aliased name: CPerson1_Pid 
                    MemberPath memberPath = new MemberPath(outputMember, member);
                    string fullFieldAlias = CqlWriter.GetQualifiedName(blockAlias, memberPath.CqlFieldAlias); 
                    fields.Add(fullFieldAlias); 
                }
 
                // Constructor call for the constructedType
                CqlWriter.AppendEscapedTypeName(builder, m_cdmType);
                builder.Append('(');
            } 

            StringUtil.ToSeparatedString(builder, fields, ", ", null); 
            builder.Append(')'); 
            if (refScope != null)
            { 
                Debug.Assert(refEntityType != null);
                builder.Append(",");
                CqlWriter.AppendEscapedTypeName(builder, refEntityType);
                builder.Append(')'); 
            }
            return builder; 
        } 
        #endregion
 
        #region Public Override Methods for object and String methods
        protected override bool IsEqualTo(Constant right)
        {
            TypeConstant rightTypeConstant = right as TypeConstant; 
            if (rightTypeConstant == null)
            { 
                return false; 
            }
            return m_cdmType == rightTypeConstant.m_cdmType; 
        }

        protected override int GetHash()
        { 
            if (m_cdmType == null)
            { // null type constant 
                return 0; 
            }
            else 
            {
                return m_cdmType.GetHashCode();
            }
        } 

        private void InternalToString(StringBuilder builder, bool isInvariant) 
        { 
            if (m_cdmType == null)
            {  // NULL type constant 
                builder.Append(isInvariant ? "NULL" : System.Data.Entity.Strings.ViewGen_Null);
            }
            else
            { 
                builder.Append(m_cdmType.Name);
            } 
        } 

        internal override string ToUserString() 
        {
            StringBuilder builder = new StringBuilder();
            InternalToString(builder, false);
            return builder.ToString(); 
        }
 
        internal override void ToCompactString(StringBuilder builder) 
        {
            InternalToString(builder, true); 
        }
        #endregion
    }
} 

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

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