private async Task <IReadOnlyCollection <ChangeItem> > ApplyRemoveAsync([NotNull] IEntry entry, [NotNull] IReadOnlyDictionary <XName, IUntypedReadableProperty> properties, [NotNull] propremove remove, bool previouslyFailed, CancellationToken cancellationToken)
{
var result = new List <ChangeItem>();
if (remove.prop?.Any == null)
{
return(result);
}
var language = remove.prop.Language;
var failed = previouslyFailed;
foreach (var element in remove.prop.Any)
{
// Add a parent elements xml:lang to the element
var elementLanguage = element.Attribute(XNamespace.Xml + "lang")?.Value;
if (string.IsNullOrEmpty(elementLanguage) && !string.IsNullOrEmpty(language))
{
element.SetAttributeValue(XNamespace.Xml + "lang", language);
}
var propertyKey = element.Name;
if (failed)
{
result.Add(ChangeItem.FailedDependency(propertyKey));
continue;
}
var property = FindProperty(properties, propertyKey);
if (property != null)
{
if (!(property is IUntypedWriteableProperty))
{
result.Add(ChangeItem.ReadOnly(property, element, "Cannot remove protected property"));
}
else if (entry.FileSystem.PropertyStore == null)
{
if (property is IDeadProperty)
{
result.Add(ChangeItem.ReadOnly(property, element, "Cannot remove dead without property store"));
}
else
{
result.Add(ChangeItem.ReadOnly(property, element, "Cannot remove live property"));
}
}
else if (property is ILiveProperty)
{
result.Add(ChangeItem.Failed(property, "Cannot remove live property"));
}
else
{
try
{
var oldValue = await property.GetXmlValueAsync(cancellationToken).ConfigureAwait(false);
var success = await entry.FileSystem.PropertyStore.RemoveAsync(entry, propertyKey, cancellationToken).ConfigureAwait(false);
// ReSharper disable once ConvertIfStatementToConditionalTernaryExpression
if (!success)
{
result.Add(ChangeItem.Failed(property, "Couldn't remove property from property store (concurrent access?)"));
}
else
{
result.Add(ChangeItem.Removed(property, oldValue));
}
}
catch (Exception ex)
{
result.Add(ChangeItem.Failed(property, ex.Message));
failed = true;
}
}
}
else
{
result.Add(ChangeItem.Removed(propertyKey));
}
}
return(result);
}
private async Task <IReadOnlyCollection <ChangeItem> > ApplySetAsync([NotNull] IEntry entry, [NotNull] Dictionary <XName, IUntypedReadableProperty> properties, [NotNull] propset set, bool previouslyFailed, CancellationToken cancellationToken)
{
var result = new List <ChangeItem>();
if (set.prop?.Any == null)
{
return(result);
}
var language = set.prop.Language;
var failed = previouslyFailed;
foreach (var element in set.prop.Any)
{
// Add a parent elements xml:lang to the element
var elementLanguage = element.Attribute(XNamespace.Xml + "lang")?.Value;
if (string.IsNullOrEmpty(elementLanguage) && !string.IsNullOrEmpty(language))
{
element.SetAttributeValue(XNamespace.Xml + "lang", language);
}
if (failed)
{
result.Add(ChangeItem.FailedDependency(element.Name));
continue;
}
var property = FindProperty(properties, element.Name);
if (property != null)
{
ChangeItem changeItem;
try
{
var writeableProperty = property as IUntypedWriteableProperty;
if (writeableProperty != null)
{
if (entry.FileSystem.PropertyStore == null && writeableProperty is IDeadProperty)
{
changeItem = ChangeItem.ReadOnly(property, element, "Cannot modify dead without property store");
}
else
{
var oldValue = await writeableProperty
.GetXmlValueAsync(cancellationToken)
.ConfigureAwait(false);
await writeableProperty
.SetXmlValueAsync(element, cancellationToken)
.ConfigureAwait(false);
changeItem = ChangeItem.Modified(property, element, oldValue);
}
}
else
{
changeItem = ChangeItem.ReadOnly(property, element, "Cannot modify protected property");
}
}
catch (Exception ex)
{
changeItem = ChangeItem.Failed(property, ex.Message);
}
failed = !changeItem.IsSuccess;
result.Add(changeItem);
}
else
{
if (entry.FileSystem.PropertyStore == null)
{
result.Add(ChangeItem.InsufficientStorage(element, "Cannot add dead property without property store"));
failed = true;
}
else
{
var newProperty = new DeadProperty(entry.FileSystem.PropertyStore, entry, element);
properties.Add(newProperty.Name, newProperty);
await newProperty.SetXmlValueAsync(element, cancellationToken)
.ConfigureAwait(false);
result.Add(ChangeItem.Added(newProperty, element));
}
}
}
return(result);
}
private async Task <IReadOnlyCollection <ChangeItem> > RevertChangesAsync([NotNull] IEntry entry, [NotNull][ItemNotNull] IReadOnlyCollection <ChangeItem> changes, [NotNull] IDictionary <XName, IUntypedReadableProperty> properties, CancellationToken cancellationToken)
{
if (entry.FileSystem.PropertyStore == null || _fileSystem.PropertyStore == null)
{
throw new InvalidOperationException("The property store must be configured");
}
var newChangeItems = new List <ChangeItem>();
foreach (var changeItem in changes.Reverse())
{
ChangeItem newChangeItem;
switch (changeItem.Status)
{
case ChangeStatus.Added:
Debug.Assert(entry.FileSystem.PropertyStore != null, "entry.FileSystem.PropertyStore != null");
await entry.FileSystem.PropertyStore.RemoveAsync(entry, changeItem.Key, cancellationToken).ConfigureAwait(false);
newChangeItem = ChangeItem.FailedDependency(changeItem.Key);
properties.Remove(changeItem.Key);
break;
case ChangeStatus.Modified:
Debug.Assert(entry.FileSystem.PropertyStore != null, "entry.FileSystem.PropertyStore != null");
Debug.Assert(changeItem.OldValue != null, "changeItem.OldValue != null");
if (changeItem.OldValue == null)
{
throw new InvalidOperationException("There must be a old value for the item to change");
}
await entry.FileSystem.PropertyStore.SetAsync(entry, changeItem.OldValue, cancellationToken).ConfigureAwait(false);
newChangeItem = ChangeItem.FailedDependency(changeItem.Key);
break;
case ChangeStatus.Removed:
if (changeItem.Property != null)
{
properties.Add(changeItem.Key, changeItem.Property);
Debug.Assert(_fileSystem.PropertyStore != null, "_fileSystem.PropertyStore != null");
Debug.Assert(changeItem.OldValue != null, "changeItem.OldValue != null");
if (changeItem.OldValue == null)
{
throw new InvalidOperationException("There must be a old value for the item to change");
}
await _fileSystem.PropertyStore.SetAsync(entry, changeItem.OldValue, cancellationToken).ConfigureAwait(false);
}
newChangeItem = ChangeItem.FailedDependency(changeItem.Key);
break;
case ChangeStatus.Conflict:
case ChangeStatus.Failed:
case ChangeStatus.InsufficientStorage:
case ChangeStatus.ReadOnlyProperty:
case ChangeStatus.FailedDependency:
newChangeItem = changeItem;
break;
default:
throw new NotSupportedException();
}
newChangeItems.Add(newChangeItem);
}
newChangeItems.Reverse();
return(newChangeItems);
}