Django full url in get_absolute_url

I want to have a absolute/complete url when i call my models get_absolute_url method in template. in my entry model i have below:

def get_absolute_url(self):
    return ('blog_entry_detail', (), { 'year': self.pub_date.strftime("%Y"),
                                           'month': self.pub_date.strftime("%b").lower(),
                                           'day': self.pub_date.strftime("%d"),
                                           'slug': self.slug })

get_absolute_url = models.permalink(get_absolute_url)

in my template file:

{{object.get_absolute_url}}

I want to output the url prepended with 'http://www.example.com'

I want to use below lines to get the current domain name but i dont know where will i put it.

from django.contrib.sites.models import Site
current_site = Site.objects.get_current().domain