Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / DataEntity / System / Data / Objects / ObjectStateEntryOriginalDbUpdatableDataRecord.cs / 1305376 / ObjectStateEntryOriginalDbUpdatableDataRecord.cs
//---------------------------------------------------------------------- //// Copyright (c) Microsoft Corporation. All rights reserved. // // // @owner [....] // @backupOwner [....] //--------------------------------------------------------------------- using System; using System.ComponentModel; using System.Data; using System.Data.Common; using System.Data.Metadata.Edm; using System.Diagnostics; using System.Reflection; namespace System.Data.Objects { // Internal version of writeable original values record is used by all internal operations that need to set original values, such as PreserveChanges queries // This version should never be returned to the user, because it doesn't enforce any necessary restrictions. // See ObjectStateEntryOriginalDbUpdatableDataRecord_Public for user scenarios. internal class ObjectStateEntryOriginalDbUpdatableDataRecord_Internal : OriginalValueRecord { internal ObjectStateEntryOriginalDbUpdatableDataRecord_Internal(EntityEntry cacheEntry, StateManagerTypeMetadata metadata, object userObject) : base(cacheEntry, metadata, userObject) { EntityUtil.CheckArgumentNull(cacheEntry, "cacheEntry"); EntityUtil.CheckArgumentNull(userObject, "userObject"); EntityUtil.CheckArgumentNull(metadata, "metadata"); Debug.Assert(!cacheEntry.IsKeyEntry, "Cannot create an ObjectStateEntryOriginalDbUpdatableDataRecord_Internal for a key entry"); switch (cacheEntry.State) { case EntityState.Unchanged: case EntityState.Modified: case EntityState.Deleted: break; default: Debug.Assert(false, "An OriginalValueRecord cannot be created for an object in an added or detached state."); break; } } protected override object GetRecordValue(int ordinal) { Debug.Assert(!_cacheEntry.IsRelationship, "should not be relationship"); return (_cacheEntry as EntityEntry).GetOriginalEntityValue(_metadata, ordinal, _userObject, ObjectStateValueRecord.OriginalUpdatableInternal); } protected override void SetRecordValue(int ordinal, object value) { Debug.Assert(!_cacheEntry.IsRelationship, "should not be relationship"); (_cacheEntry as EntityEntry).SetOriginalEntityValue(_metadata, ordinal, _userObject, value); } } // Public version of writeble original values record that is to be returned to the user for setting original values directly. // Although this class is actually internal, it is the version that implements the writeable original values functionality returned through the public surface. // This version must maintain information about the index of the top-level entity property that corresponds to this record, because the record // may represent a complex type somewhere in an entity hierarchy and this is the only way we know which entity property it is associated with. // This version also does minimal necessary validation on the values that the user is trying to set. internal sealed class ObjectStateEntryOriginalDbUpdatableDataRecord_Public : ObjectStateEntryOriginalDbUpdatableDataRecord_Internal { // Will be EntityEntry.s_EntityRoot for entities and for complex types will be the index of the top-level entity property related to this complex type int _parentEntityPropertyIndex; internal ObjectStateEntryOriginalDbUpdatableDataRecord_Public(EntityEntry cacheEntry, StateManagerTypeMetadata metadata, object userObject, int parentEntityPropertyIndex) : base(cacheEntry, metadata, userObject) { _parentEntityPropertyIndex = parentEntityPropertyIndex; } protected override object GetRecordValue(int ordinal) { Debug.Assert(!_cacheEntry.IsRelationship, "should not be relationship"); return (_cacheEntry as EntityEntry).GetOriginalEntityValue(_metadata, ordinal, _userObject, ObjectStateValueRecord.OriginalUpdatablePublic, GetPropertyIndex(ordinal)); } protected override void SetRecordValue(int ordinal, object value) { StateManagerMemberMetadata member = _metadata.Member(ordinal); // We do not allow setting complex properties through writeable original values. // Instead individual scalar properties can be set on a data record that represents the complex type. if (member.IsComplex) { throw EntityUtil.SetOriginalComplexProperties(member.CLayerName); } // Null values are represented in data records as DBNull.Value, so translate appropriately object fieldValue = value ?? DBNull.Value; EntityEntry entry = _cacheEntry as EntityEntry; EntityState oldState = entry.State; // Only update the original values if the new value is different from the value currently set on the entity if (entry.HasRecordValueChanged(this, ordinal, fieldValue)) { // Since the original value is going to be set, validate that is doesn't violate any restrictions // Throw if trying to change the original value of the primary key if (member.IsPartOfKey) { throw EntityUtil.SetOriginalPrimaryKey(member.CLayerName); } // Verify non-nullable CLR types are not being set to null // Checking CLR type compatibility only because that's all that we check elsewhere in the stack for setting property values Type memberClrType = member.ClrType; if ((object)DBNull.Value == fieldValue && memberClrType.IsValueType && !(memberClrType.IsGenericType && typeof(Nullable<>) == memberClrType.GetGenericTypeDefinition())) { // Throw if the underlying CLR type of this property is not nullable, and it is being set to null throw EntityUtil.NullOriginalValueForNonNullableProperty(member.CLayerName, member.ClrMetadata.Name, member.ClrMetadata.DeclaringType.FullName); } base.SetRecordValue(ordinal, value); // Update the state of the ObjectStateEntry if it has been marked as Modified if (oldState == EntityState.Unchanged && entry.State == EntityState.Modified) { entry.ObjectStateManager.ChangeState(entry, oldState, EntityState.Modified); } // Set the individual property to modified entry.SetModifiedPropertyInternal(GetPropertyIndex(ordinal)); } } // For entities the property index is the specified ordinal, but otherwise it's the top-level entity property index that we have saved private int GetPropertyIndex(int ordinal) { return _parentEntityPropertyIndex == EntityEntry.s_EntityRoot ? ordinal : _parentEntityPropertyIndex; } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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