Crafter Studio Synchronization to FileSystem

Synchronization Cases

Notation
E = File or dir exists (not updated)
N = File or dir doesn't exist or has been removed
U = File has been updated (we don't care if a dir is updated, only if its contents are updated)

If it's a file

Alfresco	FileSystem	Operation
E	N	Copy to FS
E	E	Do nothing
U	E	Copy to FS
E	U	Copy to FS
N	E	Remove from FS

If it's a directory

Alfresco	FileSystem	Operation
E	N	Copy entire dir tree to FS
E	E	Synchronize recursively
U	E	Synchronize recursively
E	U	Synchronize recursively
N	E	Remove entire dir tree from FS

If it's a file in Alfresco but a dir in the FS, or a dir in Alfresco but a file in the FS

Delete whatever is in the FS and copy whatever is in Alfresco

Algorithm

function synchronize(avmNode, fsFile)
   if avmNode.exists() && !fsFile.exists()
      if avmNode.isFile()
         copyToFs(fsFile, avmNode.getContent())
      else
         copyTreeToFs(fsFile, avmNode)
   else if avmNode.exists() && fsFile.exists()
      if avmNode.isFile() && fsFile.isFile()
         if updated(avmNode, fsFile) // Can be done by date comparison, file size comparison or checksum comparison
            copyToFs(fsFile, avmNode.getContent())
      else if avmNode.isDir() && fsFile.isDir()
         for avmNodeChild in avmNode.getChildren()
            fsFileChild = fsFile.getChild(avmNodeChild.getName())
            synchronize(avmNodeChild, fsFileChild)
      else
         // This could mean that someone deleted a dir and created a file with the same name, or vice versa.
         deleteFromFs(file)
         if avmNode.isFile()
            copyToFs(fsFile, avmNode.getContent())            
         else
            copyTreeToFs(fsFile, avmNode)
   else if !avmNode.exists() && fsFile.exists()
      deleteFromFs(fsFile)