ExtentKey.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 / Validation / ExtentKey.cs / 1305376 / ExtentKey.cs
                        

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

 
using System.Data.Common.Utils;
using System.Collections.Generic;
using System.Text;
using System.Diagnostics; 
using System.Data.Metadata.Edm;
 
namespace System.Data.Mapping.ViewGeneration.Structures 
{
 
    // This class represents the key of  constraint on values that a relation slot may have
    internal class ExtentKey : InternalBase
    {
 
        #region Constructors
        // effects: Creates a key object for an extent (present in each MemberPath) 
        // with the fields corresponding to keyFields 
        internal ExtentKey(IEnumerable keyFields)
        { 
            m_keyFields = new List(keyFields);
        }
        #endregion
 
        #region Fields
        // All the key fields in an entity set 
        private List m_keyFields; 
        #endregion
 
        #region Properties
        internal IEnumerable KeyFields
        {
            get { return m_keyFields; } 
        }
        #endregion 
 
        #region Methods
        // effects: Determines all the keys (unique and primary for 
        // entityType) for entityType and returns a key. "prefix" gives the
        // path of the extent or end of a relationship in a relationship set
        // -- prefix is prepended to the entity's key fields to get the full memberpath
        internal static List GetKeysForEntityType(MemberPath prefix, EntityType entityType) 
        {
            // CHANGE_[....]_MULTIPLE_KEYS: currently there is a single key only. Need to support 
            // keys inside complex types + unique keys 
            ExtentKey key = GetPrimaryKeyForEntityType(prefix, entityType);
 
            List keys = new List();
            keys.Add(key);
            return keys;
        } 

        // effects: Returns the key for entityType prefixed with prefix (for 
        // its memberPath) 
        internal static ExtentKey GetPrimaryKeyForEntityType(MemberPath prefix, EntityType entityType)
        { 
            List keyFields = new List();
            foreach (EdmMember keyMember in entityType.KeyMembers)
            {
                Debug.Assert(keyMember != null, "Bogus key member in metadata"); 
                keyFields.Add(new MemberPath(prefix, keyMember));
            } 
 
            // Just have one key for now
            ExtentKey key = new ExtentKey(keyFields); 
            return key;
        }

        // effects: Returns a key correspnding to all the fields in different 
        // ends of relationtype prefixed with "prefix"
        internal static ExtentKey GetKeyForRelationType(MemberPath prefix, AssociationType relationType) 
        { 
            List keyFields = new List();
 
            foreach (AssociationEndMember endMember in relationType.AssociationEndMembers)
            {
                MemberPath endPrefix = new MemberPath(prefix, endMember);
                EntityType entityType = MetadataHelper.GetEntityTypeForEnd(endMember); 
                ExtentKey primaryKey = GetPrimaryKeyForEntityType(endPrefix, entityType);
                keyFields.AddRange(primaryKey.KeyFields); 
            } 
            ExtentKey key = new ExtentKey(keyFields);
            return key; 
        }

        internal string ToUserString()
        { 
            string result = StringUtil.ToCommaSeparatedStringSorted(m_keyFields);
            return result; 
        } 

        internal override void ToCompactString(StringBuilder builder) 
        {
            StringUtil.ToCommaSeparatedStringSorted(builder, m_keyFields);
        }
        #endregion 
    }
} 

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

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