SourceInterpreter.cs source code in C# .NET

                        Code:
                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / DataEntity / System / Data / Map / Update / Internal / SourceInterpreter.cs / 1305376 / SourceInterpreter.cs
                        
                        
                            //---------------------------------------------------------------------- 
// 
//      Copyright (c) Microsoft Corporation.  All rights reserved.
// 
// 
// @owner [....]
// @backupOwner [....] 
//--------------------------------------------------------------------- 

using System.Collections.Generic; 
using System.Collections.ObjectModel;
using System.Diagnostics;
using System.Data.Objects;
using System.Data.Metadata.Edm; 
namespace System.Data.Mapping.Update.Internal
{ 
    ///  
    /// This class determines the state entries contributing to an expression
    /// propagated through an update mapping view (values in propagated expressions 
    /// remember where they come from)
    /// 
    internal class SourceInterpreter
    { 
        private SourceInterpreter(UpdateTranslator translator, EntitySet sourceTable)
        { 
            m_stateEntries = new List(); 
            m_translator = translator;
            m_sourceTable = sourceTable; 
        }

        private readonly List m_stateEntries;
        private readonly UpdateTranslator m_translator; 
        private readonly EntitySet m_sourceTable;
 
        ///  
        /// Finds all markup associated with the given source.
        ///  
        /// Source expression. Must not be null.
        /// Translator containing session information.
        /// Table from which the exception was thrown (must not be null).
        /// Markup. 
        internal static ReadOnlyCollection GetAllStateEntries(PropagatorResult source, UpdateTranslator translator,
            EntitySet sourceTable) 
        { 
            Debug.Assert(null != source);
            Debug.Assert(null != translator); 
            Debug.Assert(null != sourceTable);

            SourceInterpreter interpreter = new SourceInterpreter(translator, sourceTable);
            interpreter.RetrieveResultMarkup(source); 

            return new ReadOnlyCollection(interpreter.m_stateEntries); 
        } 

        private void RetrieveResultMarkup(PropagatorResult source) 
        {
            Debug.Assert(null != source);

            if (source.Identifier != PropagatorResult.NullIdentifier) 
            {
                // state entries travel with identifiers. several state entries may be merged 
                // into a single identifier result via joins in the update mapping view 
                do
                { 
                    if (null != source.StateEntry)
                    {
                        m_stateEntries.Add(source.StateEntry);
                        if (source.Identifier != PropagatorResult.NullIdentifier) 
                        {
                            // if this is an identifier, it may also be registered with an "owner". 
                            // Return the owner as well if the owner is also mapped to this table. 
                            PropagatorResult owner;
                            if (m_translator.KeyManager.TryGetIdentifierOwner(source.Identifier, out owner) && 
                                null != owner.StateEntry &&
                                ExtentInScope(owner.StateEntry.EntitySet))
                            {
                                m_stateEntries.Add(owner.StateEntry); 
                            }
 
                            // Check if are any referential constraints. If so, the entity key 
                            // implies that the dependent relationship instance is also being
                            // handled in this result. 
                            foreach (IEntityStateEntry stateEntry in m_translator.KeyManager.GetDependentStateEntries(source.Identifier))
                            {
                                m_stateEntries.Add(stateEntry);
                            } 
                        }
                    } 
                    source = source.Next; 
                }
                while (null != source); 
            }
            else if (!source.IsSimple && !source.IsNull)
            {
                // walk children 
                foreach (PropagatorResult child in source.GetMemberValues())
                { 
                    RetrieveResultMarkup(child); 
                }
            } 
        }

        // Determines whether the given table is in scope for the current source: if the source
        // table does not map to the source table for this interpreter, it is not in scope 
        // for exceptions thrown from this table.
        private bool ExtentInScope(EntitySetBase extent) 
        { 
            if (null == extent)
            { 
                return false;
            }
            // determine if the extent is mapped to this table
            return m_translator.ViewLoader.GetAffectedTables(extent, m_translator.MetadataWorkspace).Contains(m_sourceTable); 
        }
    } 
} 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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SourceInterpreter.cs source code in C# .NET

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