from django.http import HttpResponse


class FormHandler(HttpResponse):
    
    def __init__(self, request, *args, **kwargs):
        if request.method == 'POST':
            form = self.form(request.POST)
            if form.is_valid():
                self._update(self.valid(request, form, *args, **kwargs))
            else:
                self._update(self.invalid(request, form, *args, **kwargs))
        else:
            self._update(self.unbound(request, self.form(), *args, **kwargs))
    
    def _update(self, response):
        if not response:
            return
		self._charset = response._charset
		self._is_string = response._is_string
		self._container = response._container
		self._headers.update(response._headers)
		self.cookies.update(response.cookies)
		self.status_code = response.status_code


###########
# EXAMPLE #
###########


class MyFormHandler(FormHandler):
    
    form = MyForm
    
    def valid(self, request, form):
        process_form(form)
        submit(some_data)
        do(something)
        return HttpResponse('Everything went OK.')
    
    def invalid(self, request, form):
        return render_to_response('errors_in_form.html', {'form': form})
    
    def unbound(self, request, form):
        return render_to_response('form_input.html', {'form': form})