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# Copyright (C) 2012 Codethink Limited
#
# 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; version 2 of the License.
#
# 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.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
class SourcePool(object):
'''Manage a collection of Source objects.'''
def __init__(self):
self._sources = {}
self._order = []
def _key(self, repo_name, original_ref, filename):
return (repo_name, original_ref, filename)
def add(self, source):
'''Add a source to the pool.'''
key = self._key(source.repo_name,
source.original_ref,
source.filename)
if key not in self._sources:
self._sources[key] = source
self._order.append(source)
def lookup(self, repo_name, original_ref, filename):
'''Find a source in the pool.
Raise KeyError if it is not found.
'''
key = self._key(repo_name, original_ref, filename)
return self._sources[key]
def __iter__(self):
'''Iterate over sources in the pool, in the order they were added.'''
for source in self._order:
yield source
def __len__(self):
return len(self._sources)
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