"""
Utility class to merge RDF in stored in Redland containers (Models and
Statements) into RSS dictionaries.
"""
class RDFItemMerger:
    """
    Merge the RDF in the model into the RSS dictionary item.
    """
    def merge_model(self, item, model):
        for s in model: self.merge_statement(item, s)
    
    """
    Merge a single RDF statement into the RSS dictionary item.
    """
    def merge_statement(self, item, statement):
        item[self._get_namespace(statement.predicate)] = str(statement.object)
    
    """
    Private function to get the namespace of a URI. Evil code, and should be
    replaced.
    """
    def _get_namespace(uri):
        from urlparse import urlsplit
        import os.path
        (scheme, network, path, query, fragment) = urlsplit(str(uri).strip("[]"))
        if fragment:
            return ("%s://%s%s%s" % (scheme, network, path, query), fragment)
        else:
            (path, node) = os.path.split(path)
            return ("%s://%s%s/" % (scheme, network, path), node)
    _get_namespace = staticmethod(_get_namespace)