code: public Result render(Entry<String, Object> entry) {
          
          if (this.renderable == null) {
          
              Map<String, Object> map = Maps.newHashMap();
              this.renderable = map;
              map.put(entry.getKey(), entry.getValue());
          } else {
              
              assertObjectNoRenderableOrThrowException(this.renderable);
              
              Map<String, Object> map;
              if (this.renderable instanceof Map) {
                  
                  map = (Map) this.renderable;
                  if (map.containsKey(entry.getKey())) {
                      throw new IllegalArgumentException(
                             String.format(
                                   "Entry with key %s already stored inside this Result object. "
                                   + "This is currently not supported and does not make sense. "
                                   +  "Consider using your own map.",
                                           entry.getKey()));
                  } else { 
                      map.put(entry.getKey(), entry.getValue());
                  
                  }
                  
              } else {                
                  map = Maps.newHashMap();
                  map.put(
                          SwissKnife.getRealClassNameLowerCamelCase(this.renderable), 
                          this.renderable);
                  
                  this.renderable = map;
                                
              }
              
              map.put(entry.getKey(), entry.getValue());
              
          }
          
          
          return this;
          
          
      }
docs: Handles following cases:
  1) If this.renderable is null: a new HashMap is generated and this entry being added
  to the map.
  2) If this.renderable is a Map: the entry is added
  3) If this.renderable is an object (not a renderable): a Map is generated and both
  the former object and the new entry are being added.
  4) If this.renderable is a Renderable: an {@link IllegalArgumentException} is thrown.
  
  If the entry key already exists in the map of this.renderable an {@link IllegalArgumentException}
  is thrown.
  
  @param entry The entry to add.
  @return The result for further chaining.