code: public Entity add (Component component) {
  		if (addInternal(component)) {
  			if (componentOperationHandler != null) {
  				componentOperationHandler.add(this);
  			}
  			else {
  				notifyComponentAdded();
  			}
  		}
  		
  		return this;
  	}
docs: Adds a {@link Component} to this Entity. If a {@link Component} of the same type already exists, it'll be replaced.
  @return The Entity for easy chaining