jgrewe/nixview-python
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[file handler] add FileDescriptor

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Jan Grewe 2021-01-06 14:27:21 +01:00
parent 4088b96861
commit 49d6749ecd
1 changed files with 57 additions and 0 deletions
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57
file_handler.py
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@ -14,6 +14,51 @@ class ItemDescriptor():
self.definition = definition self.definition = definition
self.value = value self.value = value
self.entity_type = entity_type self.entity_type = entity_type
class FileDescriptor():
def __init__(self, filename, format, version, created_at, updated_at, size) -> None:
super().__init__()
self.name = filename
self.size = None
self.format = format
self.version = version
self.created_at = created_at
self.updated_at = updated_at
self.size = size
self.block_count = 0
self.data_array_count = 0
self.tag_count = 0
self.group_count = 0
self.data_frame_count = 0
def toHtml(self):
def namAndPath(filename):
parts = filename.split(os.sep)
name = parts[-1]
path = ""
if len(parts) > 1:
path = os.sep.join(parts[:-1])
return name, path
name, path = namAndPath(self.name)
descr = "<html><h4>%s</h4>" % name
descr += "<ol style='list-style-type:none'>"
descr += "<li><small><b>location:</b> %s</small></li>" % (path if len(path) > 1 else ".")
descr += "<li><small><b>format:</b> %s</small></li>" % (self.format)
descr += "<li><small><b>nix format version:</b> %s</small></li>" % (str(self.version))
descr += "<li><small><b>file size:</b> %.2f MB</small></li>" % (self.size)
descr += "<hr>"
descr += "<li>File contents</li>"
descr += "<li><small><b>blocks:</b> %i</small></li>" % self.block_count
descr += "<li><small><b>groups:</b> %i</small></li>" % self.group_count
descr += "<li><small><b>data arrays:</b> %i</small></li>" % self.data_array_count
descr += "<li><small><b>data frames:</b> %i</small></li>" % self.data_frame_count
descr += "<li><small><b>tags:</b> %i</small></li>" % self.tag_count
descr += "<hr>"
descr += "<li><small><b>created at:</b> %s</small></li>" % (str(dt.datetime.fromtimestamp(self.created_at)))
descr += "<li><small><b>updated at:</b> %s</small></li>" % (str(dt.datetime.fromtimestamp(self.updated_at)))
descr += "</ol>"
descr += "</html>"
return descr
class NodeType(Enum): class NodeType(Enum):
@ -86,6 +131,16 @@ class FileHandler(metaclass=Singleton):
try: try:
self._nix_file = nix.File.open(filename, nix.FileMode.ReadOnly) self._nix_file = nix.File.open(filename, nix.FileMode.ReadOnly)
self._filename = filename self._filename = filename
self._file_descriptor = FileDescriptor(self.filename, self._nix_file.format, self._nix_file.version,
self._nix_file.created_at, self._nix_file.updated_at, os.path.getsize(self.filename)/1e+6)
self.file_descriptor.block_count = len(self._nix_file.blocks)
for b in self._nix_file.blocks:
self.file_descriptor.data_array_count += len(b.data_arrays)
self.file_descriptor.group_count += len(b.groups)
self.file_descriptor.tag_count += len(b.tags)
self.file_descriptor.tag_count += len(b.multi_tags)
if hasattr(b, "data_frames"):
self.file_descriptor.data_frame_count += len(b.data_frames)
return True, "Successfully opened file %s." % filename.split(os.sep)[-1] return True, "Successfully opened file %s." % filename.split(os.sep)[-1]
except RuntimeError as e: except RuntimeError as e:
return False, "Failed to open file %s! \n Error message is: %s" % (filename, e) return False, "Failed to open file %s! \n Error message is: %s" % (filename, e)
@ -100,9 +155,11 @@ class FileHandler(metaclass=Singleton):
self._file_requests = [] self._file_requests = []
self._entity_buffer.clear() self._entity_buffer.clear()
@property
def file_descriptor(self): def file_descriptor(self):
return ItemDescriptor() return ItemDescriptor()
return self._file_descriptor
@property @property
def is_valid(self): def is_valid(self):