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VirtualFolder is a class representing a virtual folder in a file system hierarchy that doesn't correspond to a physical folder but exists for organizational purposes.

Purpose

This class extends the Folder base class to create virtual folders that exist only in memory or as logical constructs. Virtual folders are used to organize content without having physical storage backing. They maintain parent-child relationships, have unique identifiers, and always report the current time as their modification time. The 'virtual' property distinguishes them from regular folders.

Source Code

class VirtualFolder(Folder):

    def __init__(self, name, id_, parent_id=None):
        self._name = name
        self._id = id_
        self._parent = parent_id
        self.children = []

    @property
    def name(self):
        return self._name

    @property
    def id(self):
        return self._id

    @property
    def parent(self):
        return self._parent

    @property
    def mtime(self):
        return now()

    @property
    def virtual(self):
        return True

Parameters

Name	Type	Default	Kind
bases	Folder	-

Parameter Details

name: String representing the display name of the virtual folder

id_: Unique identifier for the virtual folder, typically a string or UUID

parent_id: Optional identifier of the parent folder. If None, this folder has no parent (could be a root-level virtual folder). Defaults to None.

Return Value

Instantiation returns a VirtualFolder object with the specified name, id, and parent relationship. The object has read-only properties for name, id, parent, mtime (modification time), and virtual status. The children attribute is a mutable list that can store child items.

Class Interface

Methods

Attributes

Name	Type	Description	Scope
_name	str	Private attribute storing the folder's name, exposed via the name property	instance
_id	str or UUID	Private attribute storing the folder's unique identifier, exposed via the id property	instance
_parent	str or UUID or None	Private attribute storing the parent folder's identifier, exposed via the parent property	instance
children	list	Public mutable list that stores child items (files or folders) contained within this virtual folder	instance

Dependencies

• trio
• functools
• io
• json
• logging
• uuid
• zipfile

Required Imports

from const import ROOT_ID
from const import TRASH_ID
from const import FileType
from utils import now
from utils import parse_datetime
from exceptions import DocumentNotFound
from exceptions import VirtualItemError
from sync import add_sync
from rmrl import render
from rmrl import sources

Usage Example

# Create a virtual folder
virtual_folder = VirtualFolder(name='My Virtual Folder', id_='vf-12345', parent_id='parent-67890')

# Access properties
print(virtual_folder.name)  # 'My Virtual Folder'
print(virtual_folder.id)  # 'vf-12345'
print(virtual_folder.parent)  # 'parent-67890'
print(virtual_folder.virtual)  # True
print(virtual_folder.mtime)  # Current timestamp

# Add children
virtual_folder.children.append(child_item)

# Create a root-level virtual folder
root_virtual = VirtualFolder(name='Root Virtual', id_='vf-root')

Best Practices

• VirtualFolder instances are immutable in terms of name, id, and parent - these are set at construction and exposed as read-only properties
• The children attribute is mutable and should be managed by the code using this class to maintain the folder hierarchy
• Always check the 'virtual' property to distinguish virtual folders from physical folders when processing folder hierarchies
• The mtime property always returns the current time, so it's not suitable for tracking actual modification history
• When creating folder hierarchies, ensure parent_id references are valid and don't create circular references
• The id_ parameter should be unique across all folders (virtual and non-virtual) in the system
• This class inherits from Folder, so it may have additional methods and behaviors defined in the parent class

Tags

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class VirtualFolder(Folder):

    def __init__(self, name, id_, parent_id=None):
        self._name = name
        self._id = id_
        self._parent = parent_id
        self.children = []

    @property
    def name(self):
        return self._name

    @property
    def id(self):
        return self._id

    @property
    def parent(self):
        return self._parent

    @property
    def mtime(self):
        return now()

    @property
    def virtual(self):
        return True