EL function closestWidgetVar

Currently you have an EL method resolveWidgetVar(String expression, UIComponent source) to find a widget var. I would like to have a method to find the widget var relative to the current component, so go up to the root until a component which implements Widget is found.

I created this method in my project:

  public static String closestWidgetVar() {
    return Stream.iterate(Components.getCurrentComponent().getParent(),
                          c -> Objects.nonNull(c.getParent()),
                          UIComponent::getParent)
            .filter(Widget.class::isInstance)
            .findFirst()
            .map(Widget.class::cast)
            .map(Widget::resolveWidgetVar)
            .map(w -> String.format("PF('%s')", w))
            .orElse(null);
  }

It uses Java 9 and OmniFaces, so it needs a bit of rewriting. If you want to I can create a PR for this.

[tandraschko]

and also introduce closestWidget, which can be reused by closestWidgetVar

[tandraschko]

Thanks for the PR!