Александър обнови решението на 30.04.2015 14:37 (преди почти 9 години)
+class File():
+
+ def __init__(self, name, content=''):
+ self.name = name
+ self.content = content
+ self.is_directory = False
+ self.size = len(content) + 1
+
+ def append(self, text):
+ self.content += text
+
+ def truncate(self, text):
+ self.content = text
+
+ def size(self):
+ return len(self.content) + 1
+
+
+class Directory(object):
+ def __init__(self, name):
+ self.name = name
+ self.files = {name: {}}
+ self.directories = []
+ self.nodes = []
+ self.is_directory = True
+
+ def _get_index_for_removing_node(self, name, directory=False):
+ if directory:
+ for dirs in range(0, len(self.directories)):
+ if self.directories[dirs].name == name:
+ return dirs
+ else:
+ for node in range(0, len(self.nodes)):
+ if self.nodes[node].name == name:
+ return node
+ return False
+
+
+class FileSystemError(Exception):
+ pass
+
+
+class NodeDoesNotExistError(FileSystemError):
+ pass
+
+
+class FileSystemMountError(FileSystemError):
+ pass
+
+
+class NotEnoughSpaceError(FileSystemError):
+ pass
+
+
+class SourceNodeDoesNotExistError(NodeDoesNotExistError):
+ pass
+
+
+class DestinationNodeDoesNotExistError(NodeDoesNotExistError):
+ pass
+
+
+class DestinationNotADirectoryError(FileSystemError):
+ pass # ???
+
+
+class DestinationNodeExistsError(FileSystemError):
+ pass # ????
+
+
+class MountPointDoesNotExistError(FileSystemMountError):
+ pass
+
+
+class MountPointNotADirectoryError(FileSystemMountError):
+ pass
+
+
+class MountPointNotEmptyError(FileSystemMountError):
+ pass
+
+
+class FileSystemRemoveError(FileSystemError):
+ pass
+
+
+class NonExplicitDirectoryDeletionError(FileSystemRemoveError):
+ pass
+
+
+class NonEmptyDirectoryDeletionError(FileSystemRemoveError):
+ pass
+
+
+class FileSystem():
+
+ def __init__(self, size):
+ self.root = Directory('')
+ self.size = size
+ self.available_size = size - 1
+
+ def __get_directory(self, directory, path_list):
+ temp = directory
+ if len(path_list) > 2:
+ #is valid path
+ for idx in range(0, len(path_list) - 1):
+ temp = temp[path_list[idx]]
+ elif len(path_list) == 2:
+ if path_list[1] in directory.files[path_list[0]]:
+ temp = temp[path_list[0]]
+ elif directory.files[''] == {}:
+ return directory
+ else:
+ raise DestinationNodeDoesNotExistError
+ else:
+ return directory[path_list[0]]
+
+ def get_node(self, path):
+ if path == '/':
+ new_path = ['']
+ else:
+ new_path = path.split('/')
+ return self.__get_directory(self.root, new_path)
+
+ def create(self, path, directory=False, content=''):
+ new_path = path.split('/')
+ name = new_path[-1:][0]
+ new_directory = self.__get_directory(self.root, new_path)
+ if directory:
+ if (name not in new_directory.files):
+ if self.available_size > 0:
+ new_directory.directories.append(Directory(name))
+ if new_directory.files[''] == {}:
+ new_directory = new_directory.files['']
+ new_directory[name] = Directory(name)
+ else:
+ new_directory.files[name] = Directory(name)
+ self.available_size -= 1
+ else:
+ raise NotEnoughSpaceError
+ else:
+ raise DestinationNodeExistsError
+ else:
+ if new_directory.is_directory and name not in new_directory.files:
+ if self.available_size >= len(content):
+ new_directory.nodes.append(File(name))
+ if new_directory.files[''] == {}:
+ new_directory = new_directory.files['']
+ new_directory[name] = File(name, content)
+ else:
+ new_directory.files[name] = File(name, content)
+ self.available_size -= (len(content) + 1)
+ else:
+ raise NotEnoughSpaceError
+ else:
+ raise DestinationNodeExistsError
+
+ def remove(self, path, directory=False, force=True):
+ new_path = path.split('/')
+ name = new_path[-1:][0]
+ new_directory = self.__get_directory(self.root, new_path[:1])
+
+ if directory:
+ if name in new_directory.files:
+ if new_directory.files[name] == {} or\
+ (new_directory.files[name] != {} and force):
+ self.available_size += 1
+ del new_directory.files[name]
+ else:
+ raise NonEmptyDirectoryDeletionError
+ else:
+ raise NodeDoesNotExistError
+ elif not directory and new_directory.files[name].is_directory:
+ raise NonExplicitDirectoryDeletionError
+ else:
+ if name in new_directory:
+ self.available_size += new_directory.files[name]
+ del new_directory.files[name]
+ else:
+ raise NodeDoesNotExistError
+
+ def move(self, source, destination):
+ pass
+
+ def link(self, source, destination, symbolic=True):
+ pass
+
+ def mount(self, file_system, path):
+ pass
+
+ def unmount(self, path):
+ pass
+
+
+if __name__ == '__main__':
+ a = FileSystem(100)
+ a.create('/data')
+ b = a.get_node('/data')
+ a.remove('/data')
+ print(a.available_size)