/// <nodoc/>
public GitFileChangeObservable(GitTreeDiffResponse changes, PathTable pathTable)
{
Contract.Requires(changes != null);
Contract.Requires(pathTable != null);
m_pathTable = pathTable;
Changes = ComputeChangedPathInfo(changes);
}
private List <ChangedPathInfo> ComputeChangedPathInfo(GitTreeDiffResponse changes)
{
var result = new List <ChangedPathInfo>();
// Renames and object type changes are returned as delete on the old object and add on the new object.
// So we compute the set of changes for a given path to determine and report type changes
var objectTypePerPath = new Dictionary <string, List <GitObjectType> >();
foreach (var change in changes.TreeDiff.DiffEntries)
{
if (objectTypePerPath.TryGetValue(change.Path, out var objectTypes))
{
objectTypes.Add(change.ObjectType);
}
else
{
objectTypePerPath[change.Path] = new List <GitObjectType> {
change.ObjectType
};
}
}
foreach (var change in changes.TreeDiff.DiffEntries)
{
PathChanges pathChanges;
switch (change.ChangeType)
{
case VersionControlChangeType.Add:
pathChanges = PathChanges.NewlyPresent;
break;
case VersionControlChangeType.Edit:
pathChanges = PathChanges.DataOrMetadataChanged;
break;
case VersionControlChangeType.Delete:
pathChanges = PathChanges.Removed;
break;
default:
throw new NotImplementedException(I($"Change kind '{change.ChangeType}' is not supported"));
}
// Analyze the type changes now to detect file -> directory and directory -> file
var objectTypes = objectTypePerPath[change.Path];
Contract.Assert(objectTypes.Count > 0);
if (objectTypes.Count > 1)
{
var firstType = objectTypes[0];
var lastType = objectTypes[objectTypes.Count - 1];
if (firstType == GitObjectType.Blob && lastType == GitObjectType.Tree)
{
pathChanges |= PathChanges.NewlyPresentAsDirectory;
}
else if (firstType == GitObjectType.Tree && lastType == GitObjectType.Blob)
{
pathChanges |= PathChanges.NewlyPresentAsFile;
}
}
// This assumes BuildXL ran with subst.
// TODO: revisit
result.Add(new ChangedPathInfo("B:" + change.Path, pathChanges));
// Now trigger membership changes events if the type of change was add or delete
if (change.ChangeType == VersionControlChangeType.Add || change.ChangeType == VersionControlChangeType.Delete)
{
AddAllAssociatedMemebershipChanges(change.Path, result);
}
}
return(result);
}
