def prepare(self, streams):
        for f in self.prepare_filters:
            map(f, streams)
        return streams

    # state icon: bookmark star, or deleted mark
    def prepare_filter_icons(self, row):
        if conf.show_bookmarks:
            # and "bookmarks" in self.parent.channels:
            row["favourite"] = self.parent.bookmarks.is_in(row.get("url", "file:///tmp/none"))
            # this should really go into bookmarks plugin itself,
            # disadvantage: would decelerate processing loop further
        if not row.get("state"):
            if row.get("favourite"):
                row["state"] = gtk.STOCK_ABOUT
            if row.get("deleted"):
                row["state"] = gtk.STOCK_DELETE