Class TreeStructureAdvisor<E>

    • Constructor Detail

      • TreeStructureAdvisor

        public TreeStructureAdvisor()
    • Method Detail

      • getParent

        public E getParent​(E element)
        Returns the parent for the given element, or null indicating that the parent can't be computed. In this case the tree-structured viewer can't expand a given node correctly if requested. The default implementation returns null; clients should override.
        Parameters:
        element - the element
        Returns:
        the parent element, or null if it has none or if the parent cannot be computed
      • hasChildren

        public Boolean hasChildren​(E element)
        Returns whether the given element has children, or null if the actual children collection should be consulted. The default implementation returns null; clients should override.

        Intended as an optimization for when the viewer does not need the actual children. Clients may be able to implement this more efficiently than getChildren.

        Parameters:
        element - the element
        Returns:
        Boolean.TRUE if the given element has children, Boolean.FALSE if the given element never has children, or null if the children collection should be consulted.