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# Copyright (C) 2005 Canonical Ltd
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
"""Implementation of Transport that uses memory for its storage."""
import os
import errno
from cStringIO import StringIO
from bzrlib.trace import mutter
from bzrlib.transport import Transport, \
TransportError, NoSuchFile, FileExists
class MemoryStat(object):
def __init__(self, size):
self.st_size = size
class MemoryTransport(Transport):
"""This is the transport agent for local filesystem access."""
def __init__(self):
"""Set the 'base' path where files will be stored."""
super(MemoryTransport, self).__init__('in-memory:')
self._dirs = set()
self._files = {}
def clone(self, offset=None):
"""See Transport.clone()."""
return self
def abspath(self, relpath):
"""See Transport.abspath()."""
return self.base + relpath
def append(self, relpath, f):
"""See Transport.append()."""
self._check_parent(relpath)
self._files[relpath] = self._files.get(relpath, "") + f.read()
def _check_parent(self, relpath):
dir = os.path.dirname(relpath)
if dir != '':
if not dir in self._dirs:
raise NoSuchFile(relpath)
def has(self, relpath):
"""See Transport.has()."""
return relpath in self._files
def get(self, relpath):
"""See Transport.get()."""
if not relpath in self._files:
raise NoSuchFile(relpath)
return StringIO(self._files[relpath])
def put(self, relpath, f):
"""See Transport.put()."""
self._check_parent(relpath)
self._files[relpath] = f.read()
def mkdir(self, relpath):
"""See Transport.mkdir()."""
self._check_parent(relpath)
if relpath in self._dirs:
raise FileExists(relpath)
self._dirs.add(relpath)
def listable(self):
"""See Transport.listable."""
return True
def iter_files_recursive(self):
return iter(self._files)
# def list_dir(self, relpath):
# TODO if needed
def stat(self, relpath):
"""See Transport.stat()."""
return MemoryStat(len(self._files[relpath]))
# def lock_read(self, relpath):
# TODO if needed
#
# def lock_write(self, relpath):
# TODO if needed
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