public void SetOriginalValue(string propertyName, object value)
{
if (!OriginalValues.ContainsKey(propertyName))
{
OriginalValues.Add(propertyName, value);
}
}
// Captures the original value for a property that is changing.
internal void RecordOriginalValue(string propertyName, object oldValue, object newValue)
{
if (IsChangeTrackingEnabled && _objectState != ObjectState.Added)
{
if (OriginalValues.ContainsKey(propertyName))
{
if (object.Equals(OriginalValues[propertyName], newValue))
{
OriginalValues.Remove(propertyName);
if (OriginalValues.Count == 0 && _objectState == ObjectState.Modified)
{
State = ObjectState.Unchanged;
ModifiedProperties.Clear();
}
else
{
ModifiedProperties.Remove(propertyName);
}
}
}
else
{
OriginalValues[propertyName] = oldValue;
}
}
}
// Captures the original value for a property that is changing.
//moved internal to public scope
public void RecordOriginalValue(string propertyName, object value)
{
if (_changeTrackingEnabled && _objectState != ObjectState.Added)
{
if (!OriginalValues.ContainsKey(propertyName))
{
OriginalValues[propertyName] = value;
}
}
}
public void SetNewValue(string propertyName, object value)
{
if (OriginalValues.ContainsKey(propertyName) && OriginalValues[propertyName] == value)
{
return;
}
if (NewValues.ContainsKey(propertyName))
{
NewValues[propertyName] = value;
}
else
{
NewValues.Add(propertyName, value);
}
}
// Captures the original value for a property that is changing.
internal void RecordValue(string propertyName, object oldValue, object newValue)
{
if (_changeTrackingEnabled && _objectState != ObjectState.Added)
{
if (OriginalValues.ContainsKey(propertyName) &&
OriginalValues[propertyName] == newValue)
{
// On repasse à l'état initial
OriginalValues.Remove(propertyName);
ModifiedValues.Remove(propertyName);
}
else
{
if (!OriginalValues.ContainsKey(propertyName))
{
OriginalValues[propertyName] = oldValue;
}
ModifiedValues[propertyName] = newValue;
}
}
}
/// <summary>
/// Validate the e-tag via applies the current DataModificationItem's OriginalValues to the
/// specified query and returns result.
/// </summary>
/// <param name="query">The IQueryable to apply the property values to.</param>
/// <returns>
/// The object is e-tag checked passed.
/// </returns>
public object ValidateEtag(IQueryable query)
{
Ensure.NotNull(query, nameof(query));
var type = query.ElementType;
var param = Expression.Parameter(type);
Expression where = null;
if (OriginalValues != null)
{
foreach (var item in OriginalValues)
{
if (!item.Key.StartsWith("@", StringComparison.Ordinal))
{
where = ApplyPredicate(param, where, item);
}
}
if (OriginalValues.ContainsKey(IfNoneMatchKey))
{
where = Expression.Not(where);
}
}
var whereLambda = Expression.Lambda(where, param);
var queryable = ExpressionHelpers.Where(query, whereLambda, type);
var matchedResource = queryable.SingleOrDefault();
if (matchedResource == null)
{
// If ETAG does not match, should return 412 Precondition Failed
var message = string.Format(CultureInfo.InvariantCulture, Resources.PreconditionCheckFailed, new object[] { EntitySetOperation, query.SingleOrDefault() });
throw new PreconditionFailedException(message);
}
return(matchedResource);
}
public bool ContainsKey(TKey key) => IsKeyFiltered(key) && OriginalValues.ContainsKey(key);
public object GetOriginalValue(string propertyName)
{
return(OriginalValues.ContainsKey(propertyName) ? OriginalValues[propertyName] : null);
}
