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 ReadOnlyCollectionGetAllStateEntries(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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