Source Code for Module advene.model.core.view

 1  """ 
 2  I define the class of views. 
 3  """ 
 4   
 5  from advene.model.core.element import PackageElement, VIEW, RESOURCE 
 6  from advene.model.core.content import WithContentMixin 
 7  from advene.model.exceptions import NoContentHandlerError 
 8  from advene.model.view.register import iter_view_handlers 
 9   
10 -class View(PackageElement, WithContentMixin): 
11   
12      ADVENE_TYPE = VIEW 
13   
14      # attributes that do not prevent views to be volatile 
15      _handler = None 
16   
17      @classmethod 
18 -    def instantiate(cls, owner, id, mimetype, model, url, *args): 
19          r = super(View, cls).instantiate(owner, id, mimetype, model, url, *args) 
20          r._instantiate_content(mimetype, model, url) 
21          return r 
22   
23      @classmethod 
24 -    def create_new(cls, owner, id, mimetype, model, url): 
25          model_id = PackageElement._check_reference(owner, model, RESOURCE) 
26          cls._check_content_cls(mimetype, model_id, url) 
27          owner._backend.create_view(owner._id, id, mimetype, model_id, url) 
28          r = cls.instantiate(owner, id, mimetype, model_id, url) 
29          return r 
30   
31 -    def _update_content_handler(self): 
32          "This overrides WithContentMixin._update_content_hanlder" 
33          m = self.content_mimetype 
34          cmax = 0; hmax = None 
35          for h in iter_view_handlers(): 
36              c = h.claims_for_handle(m) 
37              if c > cmax: 
38                  cmax, hmax = c, h 
39          if cmax > 0: 
40              self._handler = hmax 
41          else: 
42              # TODO issue a user warning ? 
43              self._handler = None 
44          super(View, self)._update_content_handler() 
45   
46 -    def apply_to(self, obj): 
47          h = self._handler 
48          if  h is None: 
49              raise NoContentHandlerError(self._get_uriref()) 
50          return h.apply_to(self, obj) 
51   
52      @property 
53 -    def output_mimetype(self): 
54          h = self._handler 
55          if  h is None: 
56              raise NoContentHandlerError(self._get_uriref()) 
57          return h.get_output_mimetype(self) 
58