t.p.d.DirDBM : class documentation

Part of twisted.persisted.dirdbm View Source View In Hierarchy

Known subclasses: twisted.persisted.dirdbm.Shelf

A directory with a DBM interface.

This class presents a hash-like interface to a directory of small, flat files. It can only use strings as keys or values.

Method	__init__
Method	__len__
Method	__setitem__	`dirdbm[k] = v` Create or modify a textfile in this directory
Method	__getitem__	`dirdbm[k]` Get the contents of a file in this directory as a string.
Method	__delitem__	`del dirdbm[foo]` Delete a file in this directory.
Method	keys
Method	values
Method	items
Method	has_key
Method	setdefault
Method	get
Method	__contains__	`key in dirdbm`
Method	update	Add all the key/value pairs in `dict` to this dirdbm. Any conflicting keys will be overwritten with the values from `dict`.
Method	copyTo	Copy the contents of this dirdbm to the dirdbm at `path`.
Method	clear	Delete all key/value pairs in this dirdbm.
Method	close	Close this dbm: no-op, for dbm-style interface compliance.
Method	getModificationTime	Returns modification time of an entry.
Method	_encode	Encode a key so it can be used as a filename.
Method	_decode	Decode a filename to get the key.
Method	_readFile	Read in the contents of a file.
Method	_writeFile	Write data to a file.

def __init__(self, name): (source)

Parameters name Base path to use for the directory storage. (type: str)

def _encode(self, k): (source)

Encode a key so it can be used as a filename.

def _decode(self, k): (source)

Decode a filename to get the key.

def _readFile(self, path): (source)

Read in the contents of a file.

Override in subclasses to e.g. provide transparently encrypted dirdbm.

def _writeFile(self, path, data): (source)

Write data to a file.

Override in subclasses to e.g. provide transparently encrypted dirdbm.

def __len__(self): (source)

Returns The number of key/value pairs in this Shelf

def __setitem__(self, k, v): (source)

overridden in twisted.persisted.dirdbm.Shelf

dirdbm[k] = v Create or modify a textfile in this directory

Parameters	k	key to set (type: str)
	v	value to associate with `k` (type: str)

def __getitem__(self, k): (source)

overridden in twisted.persisted.dirdbm.Shelf

dirdbm[k] Get the contents of a file in this directory as a string.

Parameters	k	key to lookup (type: str)
Returns	The value associated with `k`
Raises	KeyError	Raised when there is no such key

def __delitem__(self, k): (source)

del dirdbm[foo] Delete a file in this directory.

Parameters	k	key to delete (type: str)
Raises	KeyError	Raised when there is no such key

def keys(self): (source)

Returns a list of filenames (keys).

def values(self): (source)

Returns a list of file-contents (values).

def items(self): (source)

Returns a list of 2-tuples containing key/value pairs.

def has_key(self, key): (source)

Parameters	key	The key to test (type: str)
Returns	A true value if this dirdbm has the specified key, a faluse value otherwise.

def setdefault(self, key, value): (source)

Parameters	key	The key to lookup (type: str)
	value	The value to associate with key if key is not already associated with a value.

def get(self, key, default=None): (source)

Parameters	key	The key to lookup (type: str)
	default	The value to return if the given key does not exist
Returns	The value associated with `key` or `default` if not `self.has_key(key)`

def __contains__(self, key): (source)

key in dirdbm

Parameters	key	The key to test (type: str)
Returns	A true value if `self.has_key(key)`, a false value otherwise.

def update(self, dict): (source)

Add all the key/value pairs in dict to this dirdbm. Any conflicting keys will be overwritten with the values from dict.

Parameters dict A mapping of key/value pairs to add to this dirdbm. (type: mapping)

def copyTo(self, path): (source)

Copy the contents of this dirdbm to the dirdbm at path.

Parameters	path	The path of the dirdbm to copy to. If a dirdbm exists at the destination path, it is cleared first. (type: `str`)
Returns	The dirdbm this dirdbm was copied to. (type: `DirDBM`)

def clear(self): (source)

Delete all key/value pairs in this dirdbm.

def close(self): (source)

Close this dbm: no-op, for dbm-style interface compliance.

def getModificationTime(self, key): (source)

Returns modification time of an entry.

Returns	Last modification date (seconds since epoch) of entry `key`
Raises	KeyError	Raised when there is no such key

API Documentation for Twisted, generated by pydoctor at 2012-06-04 17:20:01.