~launchpad-pqm/launchpad/devel

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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).

"""Browser views for packagesets."""

__metaclass__ = type

__all__ = [
    'PackagesetSetNavigation',
    ]


from lp.services.webapp import GetitemNavigation
from lp.soyuz.interfaces.packageset import IPackagesetSet


class PackagesetSetNavigation(GetitemNavigation):
    """Navigation methods for PackagesetSet."""
    usedfor = IPackagesetSet

    def traverse(self, distroseries):
        """Traverse package sets in distro series context.

        The URI fragment of interest is:

            /package-sets/lucid/mozilla

        where 'lucid' is the distro series and 'mozilla' is the package set
        *name* respectively.
        """
        if self.request.stepstogo:
            # The package set name follows after the distro series.
            ps_name = self.request.stepstogo.consume()
            return self.context.getByName(ps_name, distroseries=distroseries)

        # Otherwise return None (to trigger a NotFound error).
        return None