// Computes the Diffing for BHoMObjects that all have a HashFragment assigned (like when they have been passed through a Revision).
private static Diff DiffRevisionObjects(IEnumerable <IBHoMObject> pastObjects, IEnumerable <IBHoMObject> currentObjects, DiffingConfig diffingConfig = null)
{
// Set configurations if DiffingConfig is null. Clone it for immutability in the UI.
DiffingConfig dc = diffingConfig == null ? new DiffingConfig() : diffingConfig.DeepClone() as DiffingConfig;
// Take the Revision's objects
List <IBHoMObject> currentObjs = currentObjects.ToList();
List <IBHoMObject> readObjs = pastObjects.ToList();
// Make dictionary with object hashes to speed up the next lookups
Dictionary <string, IBHoMObject> readObjs_dict = readObjs.ToDictionary(obj => obj.RevisionFragment().Hash, obj => obj);
// Dispatch the objects: new, modified or old
List <IBHoMObject> newObjs = new List <IBHoMObject>();
List <IBHoMObject> modifiedObjs = new List <IBHoMObject>();
List <IBHoMObject> oldObjs = new List <IBHoMObject>();
List <IBHoMObject> unChanged = new List <IBHoMObject>();
var objModifiedProps = new Dictionary <string, Dictionary <string, Tuple <object, object> > >();
foreach (IBHoMObject bhomObj in currentObjs)
{
RevisionFragment revisionFragm = bhomObj.RevisionFragment();
if (revisionFragm?.PreviousHash == null)
{
newObjs.Add(bhomObj); // It's a new object
}
else if (revisionFragm.PreviousHash == revisionFragm.Hash)
{
// It's NOT been modified
if (dc.IncludeUnchangedObjects)
{
unChanged.Add(bhomObj);
}
}
else if (revisionFragm.PreviousHash != revisionFragm.Hash)
{
modifiedObjs.Add(bhomObj); // It's been modified
if (dc.EnablePropertyDiffing)
{
// Determine changed properties
IBHoMObject oldBhomObj = null;
readObjs_dict.TryGetValue(revisionFragm.PreviousHash, out oldBhomObj);
if (oldBhomObj == null)
{
continue;
}
// To compute differentProps in a Revision-Diffing, make sure we remove the RevisionFragment. We don't want to consider that.
var differentProps = Query.DifferentProperties(bhomObj.RemoveFragment(typeof(RevisionFragment)), oldBhomObj.RemoveFragment(typeof(RevisionFragment)), dc);
if (differentProps != null)
{
objModifiedProps.Add(revisionFragm.Hash, differentProps);
}
}
}
else
{
throw new Exception("Could not find hash information to perform Diffing on some objects.");
}
}
// If no modified property was found, set the field to null (otherwise will get empty list)
objModifiedProps = objModifiedProps.Count == 0 ? null : objModifiedProps;
// All ReadObjs that cannot be found by hash in the previousHash of the CurrentObjs are toBeDeleted
Dictionary <string, IBHoMObject> CurrentObjs_withPreviousHash_dict = currentObjs
.Where(obj => obj.RevisionFragment().PreviousHash != null)
.ToDictionary(obj => obj.RevisionFragment().PreviousHash, obj => obj);
oldObjs = readObjs_dict.Keys.Except(CurrentObjs_withPreviousHash_dict.Keys)
.Where(k => readObjs_dict.ContainsKey(k)).Select(k => readObjs_dict[k]).ToList();
return(new Diff(newObjs, oldObjs, modifiedObjs, diffingConfig, objModifiedProps, unChanged));
}