/// <summary>
/// Returns the data instance that should be edited based on the given edit state and data
/// type.
/// </summary>
private static Data.IData GetEditedData(IQueryableEntity entity,
DataEditState editState, Type dataType)
{
var accessor = new DataAccessor(dataType);
switch (editState) {
case DataEditState.Current:
return entity.Current(accessor);
case DataEditState.Previous:
return entity.Previous(accessor);
}
throw new InvalidOperationException("Unknown edit state");
}
/// <summary>
/// Sets the editing state for the given data type in the given entity to the given value.
/// </summary>
private void SetEditState(IQueryableEntity entity, Type dataType, DataEditState value)
{
int entityId = ((IEntity)entity).UniqueId;
HashSet<int> hashSet;
if (_previous.TryGetValue(entityId, out hashSet) == false) {
hashSet = new HashSet<int>();
_previous[entityId] = hashSet;
}
int dataId = new DataAccessor(dataType).Id;
switch (value) {
case DataEditState.Current:
hashSet.Remove(dataId);
break;
case DataEditState.Previous:
hashSet.Add(dataId);
break;
}
}
/// <summary>
/// Returns the data header that should be shown above the data type.
/// </summary>
private static string GetDataHeader(Type dataType, IQueryableEntity queryableEntity,
DataEditState editState)
{
StringBuilder result = new StringBuilder();
result.Append(dataType.Name);
if (queryableEntity is IEntity) {
result.Append(editState == DataEditState.Current ? " (current)" : " (previous)");
IEntity entity = (IEntity)queryableEntity;
DataAccessor accessor = new DataAccessor(dataType);
if (entity.WasAdded(accessor)) {
result.Append(" (added)");
}
if (entity.WasModified(accessor)) {
result.Append(" (modified)");
}
if (entity.WasRemoved(accessor)) {
result.Append(" (removed)");
}
}
return result.ToString();
}
