source: products/quintagroup.canonicalpath/trunk/quintagroup/canonicalpath/catalog.py @ 3146

from zope.interface import Interface
from zope.component import queryAdapter

#for compatibility with older plone versions
try:
    from plone.indexer.decorator import indexer
    indexer
    IS_NEW = True
except:
    IS_NEW = False

    class IDummyInterface:
        pass

    class indexer:

        def __init__(self, *interfaces):
            self.interfaces = IDummyInterface,

        def __call__(self, callable):
            callable.__component_adapts__ = self.interfaces
            callable.__implemented__ = Interface
            return callable

from interfaces import ICanonicalPath
from interfaces import ICanonicalLink


@indexer(Interface)
def canonical_path(obj, **kwargs):
    """Return canonical_path property for the object.
    """
    adapter = queryAdapter(obj, interface=ICanonicalPath)
    if adapter:
        return adapter.canonical_path
    return None


@indexer(Interface)
def canonical_link(obj, **kwargs):
    """Return canonical_link property for the object.
    """
    adapter = queryAdapter(obj, interface=ICanonicalLink)
    if adapter:
        return adapter.canonical_link
    return None

#for compatibility with older plone versions
if not IS_NEW:
    from Products.CMFPlone.CatalogTool import registerIndexableAttribute
    map(registerIndexableAttribute, ('canonical_path', 'canonical_link'),
                                    (canonical_path, canonical_link))