public void apply()

in myfaces-html5-core/src/main/java/org/apache/myfaces/html5/handler/DragSourceBehaviorHandler.java [99:197]
76 lines of code
14 McCabe index (conditional complexity)

    public void apply(FaceletContext faceletContext, UIComponent parent)
    {

        if (!ComponentHandler.isNew(parent))
        {
            if (log.isLoggable(Level.FINE))
                log.fine("Component " + DebugUtils.getPathToComponent(parent)
                        + " is not new, thus return without any operation.");

            return;
        }

        if (parent instanceof ClientBehaviorHolder)
        {
            ClientBehaviorHolder holder = _getClientBehaviorHolder(parent);

            FacesContext context = faceletContext.getFacesContext();
            Application app = context.getApplication();
            String behaviorId = getBehaviorId();
            Behavior behavior = app.createBehavior(behaviorId);

            if (!(behavior instanceof DragSourceBehavior))
            {
                throw new FacesException("Behavior is not a DragSourceBehavior");
            }

            // manually added all of the properties, so no need for this:
            // setAttributes(faceletContext, behavior);

            // set parent as draggable
            if (parent instanceof Draggable)
            {
                ((Draggable) parent).setDraggable(true);
            }
            else
            {
                if (log.isLoggable(Level.WARNING))
                    log.warning("Parent " + DebugUtils.getPathToComponent(parent)
                            + " does not implement Draggable interface, thus unable to set the draggable attribute. "
                            + "Renderer of the parent must handle the decision of being draggable manually.");
            }

            DragSourceBehavior dragSourceBehavior = (DragSourceBehavior) behavior;

            // evaluating the _param's value expression doesn't this work if I put the dragSource in a datatable and try
            // to set the valueexpression using the var of table.
            // see https://issues.apache.org/jira/browse/MYFACES-2616
            // see the thread http://www.mail-archive.com/dev@myfaces.apache.org/msg46764.html
            // thus need to pass the valuexpression to the behavior, then the renderer can evaluate it. AjaxBehavior
            // does this with a map.
            // using the same approach in DropTargetBehavior too...
            if (_action != null)
            {
                if (_action.isLiteral())
                {
                    dragSourceBehavior.setAction(_action.getValue(faceletContext));
                }
                else
                {
                    dragSourceBehavior.setValueExpression("action",
                            _action.getValueExpression(faceletContext, String.class));
                }

            }
            if (_dropTargetTypes != null)
            {
                if (_dropTargetTypes.isLiteral())
                {
                    dragSourceBehavior.setDropTargetTypes(_dropTargetTypes.getObject(faceletContext));
                }
                else
                {
                    dragSourceBehavior.setValueExpression("dropTargetTypes",
                            _dropTargetTypes.getValueExpression(faceletContext, Object.class));
                }
            }
            if (_param != null)
            {
                if (_param.isLiteral())
                {
                    dragSourceBehavior.setParam(_param.getValue(faceletContext));
                }
                else
                {
                    dragSourceBehavior.setValueExpression("param",
                            _param.getValueExpression(faceletContext, String.class));
                }

            }

            holder.addClientBehavior(ClientBehaviorEvents.DRAGSTART_EVENT, dragSourceBehavior);
        }
        else
        {
            if (log.isLoggable(Level.WARNING))
                log.warning("Parent is not a ClientBehaviorHolder.");

        }
    }