internal static ResourceChanges Compute(ResourceData oldResource, ResourceData newResource)
{
Debug.Assert(oldResource != newResource);
Debug.Assert(oldResource.Id == newResource.Id);
var result = new List <FieldChange <ResourceField> >();
foreach (var field in oldResource.SetFields)
{
var oldValue = oldResource.GetValue(field);
if (!newResource.HasValue(field))
{
result.Add(new FieldChange <ResourceField>(field, oldValue, field.DefaultValue));
}
else
{
var newValue = newResource.GetValue(field);
if (!Equals(oldValue, newValue))
{
result.Add(new FieldChange <ResourceField>(field, oldValue, newValue));
}
}
}
foreach (var field in newResource.SetFields)
{
var newValue = newResource.GetValue(field);
if (!oldResource.HasValue(field))
{
result.Add(new FieldChange <ResourceField>(field, field.DefaultValue, newValue));
}
}
return(new ResourceChanges(oldResource.Id, result.ToImmutableArray()));
}
public object GetValue(ResourceField field)
{
return(_data.GetValue(field));
}