private static Task DefaultSaveCurrentVersionFunction(UpdatePatch patch)
{
return(Task.Factory.StartNew(() =>
{
var filePath = DefaultVersionFileName;
File.WriteAllText(filePath, JsonConvert.SerializeObject(patch));
}));
}
public static UpdatePatchChanges ParseChanges(UpdatePatch current, UpdatePatch latest)
{
var result = new UpdatePatchChanges();
// Look for deletion first
Action <UpdatePatchFile, UpdatePatchFile> scanFolder = null;
scanFolder = (currentFile, latestFile) =>
{
if (currentFile == null && latestFile == null)
{
// This should not be happening
return;
}
if (currentFile != null && latestFile == null)
{
// Current file no longer exist
result.DeletedItems.Add(currentFile);
}
else if (currentFile == null && latestFile != null)
{
// New file available
result.Modifications.Add(latestFile);
}
else
{
// When both file are available
if (currentFile.IsFolder != latestFile.IsFolder)
{
// The folder/file is deleted and switched to a folder/file with same name
result.DeletedItems.Add(currentFile);
result.Modifications.Add(latestFile);
}
else if (currentFile.IsFolder)
{
// If both are folder, scan the subitems
var latestSubItems = new HashSet <UpdatePatchFile>(latestFile.SubItems.Values);
foreach (var currentSubItem in currentFile.SubItems)
{
if (latestFile.SubItems.TryGetValue(currentSubItem.Key, out var latestSubItem))
{
latestSubItems.Remove(latestSubItem);
}
scanFolder(currentSubItem.Value, latestSubItem);
}
// All the remaining items in the HashSet are files that are not scanned
// (did not appear in the current version folder)
foreach (var item in latestSubItems)
{
scanFolder(null, item);
}
}
else
{
// If both are files, scan if the hash code has changed
if (currentFile.HashCode != latestFile.HashCode)
{
result.Modifications.Add(latestFile);
}
}
}
};
scanFolder(current.Files, latest.Files);
return(result);
}