~bzr-pqm/bzr/bzr.dev

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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