def __init__(self, **kwargs):
    """
    Constructor. Called in the URLconf; can contain helpful extra
    keyword arguments, and other things.
    """
    # Go through keyword arguments, and either save their values to our
    # instance, or raise an error.
    for key, value in six.iteritems(kwargs):
        setattr(self, key, value)

@classonlymethod
def as_view(cls, **initkwargs):
    """
    Main entry point for a request-response process.
    """
    # sanitize keyword arguments
    for key in initkwargs:
        if key in cls.http_method_names:
            raise TypeError("You tried to pass in the %s method name as a "
                            "keyword argument to %s(). Don't do that."
                            % (key, cls.__name__))
        if not hasattr(cls, key):
            raise TypeError("%s() received an invalid keyword %r. as_view "
                            "only accepts arguments that are already "
                            "attributes of the class." % (cls.__name__, key))
    def view(request, *args, **kwargs):
        self = cls(**initkwargs)
        if hasattr(self, 'get') and not hasattr(self, 'head'):
            self.head = self.get
        self.request = request
        self.args = args
        self.kwargs = kwargs
        return self.dispatch(request, *args, **kwargs)
    # take name and docstring from class
    update_wrapper(view, cls, updated=())
    # and possible attributes set by decorators
    # like csrf_exempt from dispatch
    update_wrapper(view, cls.dispatch, assigned=())
    return view

def dispatch(self, request, *args, **kwargs):
    # Try to dispatch to the right method; if a method doesn't exist,
    # defer to the error handler. Also defer to the error handler if the
    # request method isn't on the approved list.
    if request.method.lower() in self.http_method_names:
        handler = getattr(self, request.method.lower(), self.http_method_not_allowed)
    else:
        handler = self.http_method_not_allowed
    return handler(request, *args, **kwargs)

def get(self, request, *args, **kwargs):
    self.object_list = self.get_queryset()
    allow_empty = self.get_allow_empty()
    if not allow_empty:
        # When pagination is enabled and object_list is a queryset,
        # it's better to do a cheap query than to load the unpaginated
        # queryset in memory.
        if (self.get_paginate_by(self.object_list) is not None
            and hasattr(self.object_list, 'exists')):
            is_empty = not self.object_list.exists()
        else:
            is_empty = len(self.object_list) == 0
        if is_empty:
            raise Http404(_("Empty list and '%(class_name)s.allow_empty' is False.")
                    % {'class_name': self.__class__.__name__})
    context = self.get_context_data()
    return self.render_to_response(context)

def get_allow_empty(self):
    """
    Returns ``True`` if the view should display empty lists, and ``False``
    if a 404 should be raised instead.
    """
    return self.allow_empty

def get_context_data(self, *args, **kwargs):
    context = super(SearchView, self).get_context_data(*args, **kwargs)
    context['criteria'] = self.criteria
    context['collections_num'] =  self.collections.count()
    context['items_num'] = self.items.count()
    context['corpus_num']  = self.corpus.count()
    context['fonds_num'] = self.fonds.count()
    context['type'] = self.type
    context['count'] = self.object_list.count()
    return context

def get_context_object_name(self, object_list):
    """
    Get the name of the item to be used in the context.
    """
    if self.context_object_name:
        return self.context_object_name
    elif hasattr(object_list, 'model'):
        return '%s_list' % object_list.model._meta.model_name
    else:
        return None

def get_paginate_by(self, queryset):
    """
    Get the number of items to paginate by, or ``None`` for no pagination.
    """
    return self.paginate_by

def get_paginate_orphans(self):
    """
    Returns the maximum number of orphans extend the last page by when
    paginating.
    """
    return self.paginate_orphans

def get_paginator(self, queryset, per_page, orphans=0,
                  allow_empty_first_page=True, **kwargs):
    """
    Return an instance of the paginator for this view.
    """
    return self.paginator_class(
        queryset, per_page, orphans=orphans,
        allow_empty_first_page=allow_empty_first_page, **kwargs)

def get_queryset(self):
    input = self.request.GET
    self.criteria = {}
    self.type = None
    if 'type' in self.kwargs:
        self.type = self.kwargs['type']
    self.collections = MediaCollection.objects.enriched()
    self.items = MediaItem.objects.enriched().filter(code__contains="_E_")
    self.corpus = MediaCorpus.objects.all()
    self.fonds  = MediaFonds.objects.all()
    switch = {
        'pattern': lambda value: (
            self.collections.quick_search(value),
            self.items.quick_search(value),
            self.corpus.quick_search(value),
            self.fonds.quick_search(value),
            ),
        'title': lambda value: (
            self.collections.word_search('title', value),
            self.items.by_title(value),
            self.corpus.word_search('title', value),
            self.fonds.word_search('title', value)),
        'location': lambda value: (
            self.collections.by_location(Location.objects.get(name=value)),
            self.items.by_location(Location.objects.get(name=value))),
        'continent': lambda value: (
            self.collections.by_continent(value),
            self.items.filter(continent = value)),
        'ethnic_group': lambda value: (
            self.collections.by_ethnic_group(value),
            self.items.filter(ethnic_group = value),
            EthnicGroup.objects.get(pk=value)),
        'creator': lambda value: (
            self.collections.word_search('creator', value),
            self.items.word_search('collection__creator', value)),
        'collector': lambda value: (
            self.collections.by_fuzzy_collector(value),
            self.items.by_fuzzy_collector(value)),
        'rec_year_from': lambda value: (
            self.collections.by_recording_year(int(value), int(input.get('rec_year_to', value))),
            self.items.by_recording_date(datetime.date(int(value), 1, 1),
                                    datetime.date(int(input.get('rec_year_to', value)), 12, 31))),
        'rec_year_to': lambda value: (self.collections, self.items),
        'pub_year_from': lambda value: (
            self.collections.by_publish_year(int(value), int(input.get('pub_year_to', value))),
            self.items.by_publish_year(int(value), int(input.get('pub_year_to', value)))),
        'pub_year_to': lambda value: (self.collections, self.items),
        'sound': lambda value: (
            self.collections.sound(),
            self.items.sound()),
        'instrument': lambda value: (
            self.collections.by_instrument(value),
            self.items.by_instrument(value)),
    }
    for key, value in input.items():
        func = switch.get(key)
        if func and value and value != "0":
            try:
                res = func(value)
                if len(res)  > 4:
                    self.collections, self.items, self.corpus, self.fonds, value = res
                elif len(res) == 4:
                    self.collections, self.items, self.corpus, self.fonds = res
                elif len(res) == 3:
                    self.collections, self.items, value = res
                    self.corpus = self.corpus.none()
                    self.fonds = self.fonds.none()
                else:
                    self.collections, self.items = res
                    self.corpus = self.corpus.none()
                    self.fonds = self.fonds.none()
            except ObjectDoesNotExist:
                self.collections = self.collections.none()
                self.items = self.items.none()
                self.corpus = self.corpus.none()
                self.fonds = self.fonds.none()
            self.criteria[key] = value
    # Save the search
    user = self.request.user
    if user:
        if user.is_authenticated():
            search = Search(username=user)
            search.save()
            if self.criteria:
                for key in self.criteria.keys():
                    value = self.criteria[key]
                    if key == 'ethnic_group':
                        try:
                            group = EthnicGroup.objects.get(value=value)
                            value = group.id
                        except:
                            value = ''
                    criter = Criteria(key=key, value=value)
                    criter.save()
                    search.criteria.add(criter)
                search.save()
    if self.type is None:
        if self.collections.count():
            self.type = 'collections'
        else:
            self.type = 'items'
    if self.type == 'items':
        objects = self.items
    elif self.type == 'collections':
        objects = self.collections
    elif self.type == 'corpus':
        objects = self.corpus
    elif self.type == 'fonds':
        objects = self.fonds
    self.objects = objects
    return objects

def get_template_names(self):
    """
    Return a list of template names to be used for the request. Must return
    a list. May not be called if render_to_response is overridden.
    """
    try:
        names = super(MultipleObjectTemplateResponseMixin, self).get_template_names()
    except ImproperlyConfigured:
        # If template_name isn't specified, it's not a problem --
        # we just start with an empty list.
        names = []
    # If the list is a queryset, we'll invent a template name based on the
    # app and model name. This name gets put at the end of the template
    # name list so that user-supplied names override the automatically-
    # generated ones.
    if hasattr(self.object_list, 'model'):
        opts = self.object_list.model._meta
        names.append("%s/%s%s.html" % (opts.app_label, opts.model_name, self.template_name_suffix))
    return names

def http_method_not_allowed(self, request, *args, **kwargs):
    logger.warning('Method Not Allowed (%s): %s', request.method, request.path,
        extra={
            'status_code': 405,
            'request': self.request
        }
    )
    return http.HttpResponseNotAllowed(self._allowed_methods())

def options(self, request, *args, **kwargs):
    """
    Handles responding to requests for the OPTIONS HTTP verb.
    """
    response = http.HttpResponse()
    response['Allow'] = ', '.join(self._allowed_methods())
    response['Content-Length'] = '0'
    return response

def paginate_queryset(self, queryset, page_size):
    """
    Paginate the queryset, if needed.
    """
    paginator = self.get_paginator(
        queryset, page_size, orphans=self.get_paginate_orphans(),
        allow_empty_first_page=self.get_allow_empty())
    page_kwarg = self.page_kwarg
    page = self.kwargs.get(page_kwarg) or self.request.GET.get(page_kwarg) or 1
    try:
        page_number = int(page)
    except ValueError:
        if page == 'last':
            page_number = paginator.num_pages
        else:
            raise Http404(_("Page is not 'last', nor can it be converted to an int."))
    try:
        page = paginator.page(page_number)
        return (paginator, page, page.object_list, page.has_other_pages())
    except InvalidPage as e:
        raise Http404(_('Invalid page (%(page_number)s): %(message)s') % {
                            'page_number': page_number,
                            'message': str(e)
        })

def render_to_response(self, context, **response_kwargs):
    """
    Returns a response, using the `response_class` for this
    view, with a template rendered with the given context.
    If any keyword arguments are provided, they will be
    passed to the constructor of the response class.
    """
    response_kwargs.setdefault('content_type', self.content_type)
    return self.response_class(
        request = self.request,
        template = self.get_template_names(),
        context = context,
        **response_kwargs
    )