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# Copyright 2009 Canonical Ltd. This software is licensed under the
# GNU Affero General Public License version 3 (see the file LICENSE).
"""Package relationships."""
__metaclass__ = type
__all__ = [
'relationship_builder',
'PackageRelationship',
'PackageRelationshipSet',
]
import operator as std_operator
from zope.interface import implements
from lp.services.webapp import canonical_url
from lp.soyuz.interfaces.packagerelationship import (
IPackageRelationship,
IPackageRelationshipSet,
)
def relationship_builder(relationship_line, parser, getter):
"""Parse relationship_line into a IPackageRelationshipSet.
'relationship_line' is parsed via given 'parser' funcion
It also lookup the corresponding URL via the given 'getter'.
Return empty list if no line is given.
"""
relationship_set = PackageRelationshipSet()
if not relationship_line:
return relationship_set
parsed_relationships = [
token[0] for token in parser(relationship_line)]
for name, version, operator in parsed_relationships:
target_object = getter(name)
if target_object is not None:
url = canonical_url(target_object)
else:
url = None
# The apt_pkg 0.8 API returns '<' and '>' rather than the '<<' and
# '>>' form used in control files.
if operator == '<':
operator = '<<'
elif operator == '>':
operator = '>>'
relationship_set.add(name, operator, version, url)
return relationship_set
class PackageRelationship:
"""See IPackageRelationship."""
implements(IPackageRelationship)
def __init__(self, name, operator, version, url=None):
self.name = name
self.version = version
self.url = url
if len(operator.strip()) == 0:
self.operator = None
else:
self.operator = operator
class PackageRelationshipSet:
"""See IPackageRelationshipSet."""
implements(IPackageRelationshipSet)
def __init__(self):
self.contents = []
def add(self, name, operator, version, url):
"""See IPackageRelationshipSet."""
self.contents.append(
PackageRelationship(name, operator, version, url))
def has_items(self):
"""See IPackageRelationshipSet."""
return len(self.contents) is not 0
def __iter__(self):
return iter(sorted(
self.contents, key=std_operator.attrgetter('name')))
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