Provided by: libtree-simple-visitorfactory-perl_0.10-2_all bug


       Tree::Simple::Visitor::FromNestedArray - A Visitor for creating Tree::Simple objects from
       nested array trees.


         use Tree::Simple::Visitor::FromNestedArray;

         my $visitor = Tree::Simple::Visitor::FromNestedArray->new();

         # given this nested array tree
         my $array_tree = [
                           'Root', [
                               'Child1', [
         # set the array tree we
         # are going to convert


         # this then creates the equivalent Tree::Simple object:
         # Tree::Simple->new("Root")
         #     ->addChildren(
         #         Tree::Simple->new("Child1")
         #             ->addChildren(
         #                 Tree::Simple->new("GrandChild1"),
         #                 Tree::Simple->new("GrandChild2")
         #             ),
         #         Tree::Simple->new("Child2"),
         #     );


       Given a tree constructed from nested arrays, this Visitor will create the equivalent
       Tree::Simple heirarchy.


       new There are no arguments to the constructor the object will be in its default state. You
           can use the "setNodeFilter", "includTrunk" and "setArrayTree" methods to customize its

       includTrunk ($boolean)
           Setting the $boolean value to true (1) will cause the node value of the $tree object
           passed into "visit" to be set with the root value found in the $array_tree. Setting it
           to false (0), or not setting it, will result in the first value in the $array_tree
           creating a new node level.

       setNodeFilter ($filter_function)
           This method accepts a CODE reference as its $filter_function argument and throws an
           exception if it is not a code reference. This code reference is used to filter the
           tree nodes as they are created, the $filter_function is passed the node value
           extracted from the array prior to it being inserted into the tree being built. The
           $filter_function is expected to return the value desired for inclusion into the tree.

       setArrayTree ($array_tree)
           This method is used to set the $array_tree that our Tree::Simple heirarchy will be
           constructed from. It must be in the following form:

               'Root', [
                   'Child1', [

           Basically each element in the array is considered a node, unless it is an array
           reference, in which case it is interpreted as containing the children of the node
           created from the previous element in the array.

           The tree is validated prior being accepted, if it fails validation an execption will
           be thrown. The rules are as follows;

           The array tree must not be empty.
               It makes not sense to create a tree out of nothing, so it is assumed that this is
               a sign of something wrong.

           All nodes of the array tree must not be array references.
               The root node is validated against this in this function, but all subsequent nodes
               are checked as the tree is built. Any nodes found to be array references are
               rejected and an exception is thrown. If you desire your node values to be array
               references, you can use the node filtering mechanism to acheive this as the node
               is filtered after it is validated.

           The array tree must be a single rooted tree.
               If there is a second element in the array tree, it is assumed to be the children
               of the root, and therefore must be in the form of an array reference.

       visit ($tree)
           This is the method that is used by Tree::Simple's "accept" method. It can also be used
           on its own, it requires the $tree argument to be a Tree::Simple object (or derived
           from a Tree::Simple object), and will throw and exception otherwise.


       None that I am aware of. Of course, if you find a bug, let me know, and I will be sure to
       fix it.


       See the CODE COVERAGE section in Tree::Simple::VisitorFactory for more inforamtion.


       These Visitor classes are all subclasses of Tree::Simple::Visitor, which can be found in
       the Tree::Simple module, you should refer to that module for more information.


       stevan little, <>


       Copyright 2004, 2005 by Infinity Interactive, Inc.


       This library is free software; you can redistribute it and/or modify it under the same
       terms as Perl itself.