twisted.persisted.dirdbm.DirDBM

class documentation

class DirDBM: (source)

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

def __contains__(self, key): (source)

See Also
`DirDBM.has_key`

def __delitem__(self, k): (source)

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

Parameters
k:bytes	key to delete
Raises
`KeyError`	Raised when there is no such key

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:bytes	key to lookup
Returns
The value associated with `k`
Raises
`KeyError`	Raised when there is no such key

def __init__(self, name): (source)

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

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:bytes	key to set
v:bytes	value to associate with `k`

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 copyTo(self, path): (source)

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

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

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

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

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

def has_key(self, key): (source)

Parameters
key:bytes	The key to test
Returns
A true value if this dirdbm has the specified key, a false value otherwise.

def items(self): (source)

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

def keys(self): (source)

Returns
a `list` of filenames (keys).

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

Parameters
key:bytes	The key to lookup
value	The value to associate with key if key is not already associated with a value.

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:mapping	A mapping of key/value pairs to add to this dirdbm.

def values(self): (source)

Returns
a `list` of file-contents (values).

dname = (source)

Undocumented

def _decode(self, k): (source)

Decode a filename to get the key.

def _encode(self, k): (source)

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

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.

_dnamePath = (source)

Undocumented