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.\"
.IX Title "Tree::Simple::Visitor::GetAllDescendents 3pm"
.TH Tree::Simple::Visitor::GetAllDescendents 3pm "2005-07-14" "perl v5.10.1" "User Contributed Perl Documentation"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
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.SH "NAME"
Tree::Simple::Visitor::GetAllDescendents \- A Visitor for fetching all the descendents of a Tree::Simple object
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\&  use Tree::Simple::Visitor::GetAllDescendents;
\&
\&  # create an instance of our visitor
\&  my $visitor = Tree::Simple::Visitor::GetAllDescendents\->new();
\&  
\&  # pass the visitor to a Tree::Simple object
\&  $tree\->accept($visitor);
\&
\&  # you can also get the descendents 
\&  # back as an array of node values
\&  my @descendents = $visitor\->getDescendents(); 
\&  
\&  # for more complex node objects, you can specify 
\&  # a node filter which will be used to extract the
\&  # information desired from each node
\&  $visitor\->setNodeFilter(sub { 
\&                my ($t) = @_;
\&                return $t\->getNodeValue()\->description();
\&                });
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
Given a Tree::Simple instance this Visitor will return all the descendents recursively on down the hierarchy.
.SH "METHODS"
.IX Header "METHODS"
.IP "\fBnew\fR" 4
.IX Item "new"
There are no arguments to the constructor the object will be in its default state. You can use the \f(CW\*(C`setNodeFilter\*(C'\fR method to customize its behavior.
.IP "\fBsetTraversalMethod ($visitor)\fR" 4
.IX Item "setTraversalMethod ($visitor)"
By default we will use Tree::Simple's built in depth-first (pre-order) traverse method. If however, you desire the descendents to be returned in a different ordering, this can be accomplished using a different traversal method, you can supply a \f(CW$visitor\fR object implementing that traversal type to this method (See  \fBTree::Simple::Visitor::BreadthFirstTraversal\fR, \fBTree::Simple::Visitor::PreOrderTraversal\fR and \fBTree::Simple::Visitor::PostOrderTraversal\fR).
.IP "\fBsetNodeFilter ($filter_function)\fR" 4
.IX Item "setNodeFilter ($filter_function)"
This method accepts a \s-1CODE\s0 reference as its \f(CW$filter_function\fR argument and throws an exception if it is not a code reference. This code reference is used to filter the tree nodes as they are collected. This can be used to customize output, or to gather specific information from a more complex tree node. The filter function should accept a single argument, which is the current Tree::Simple object.
.IP "\fBvisit ($tree)\fR" 4
.IX Item "visit ($tree)"
This is the method that is used by Tree::Simple's \f(CW\*(C`accept\*(C'\fR method. It can also be used on its own, it requires the \f(CW$tree\fR argument to be a Tree::Simple object (or derived from a Tree::Simple object), and will throw and exception otherwise.
.IP "\fBgetAllDescendents\fR" 4
.IX Item "getAllDescendents"
This method will give back and array of descendents in depth-first order (pre-order) or in the order specified by the \f(CW\*(C`setTraversalMethod\*(C'\fR. If called in scalar context it will give an array reference, in list context it will return a regular array. This method is the same as calling \f(CW\*(C`getResults\*(C'\fR.
.SH "BUGS"
.IX Header "BUGS"
None that I am aware of. Of course, if you find a bug, let me know, and I will be sure to fix it.
.SH "CODE COVERAGE"
.IX Header "CODE COVERAGE"
See the \fB\s-1CODE\s0 \s-1COVERAGE\s0\fR section in Tree::Simple::VisitorFactory for more inforamtion.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
These Visitor classes are all subclasses of \fBTree::Simple::Visitor\fR, which can be found in the \fBTree::Simple\fR module, you should refer to that module for more information.
.SH "AUTHOR"
.IX Header "AUTHOR"
stevan little, <stevan@iinteractive.com>
.SH "COPYRIGHT AND LICENSE"
.IX Header "COPYRIGHT AND LICENSE"
Copyright 2004, 2005 by Infinity Interactive, Inc.
.PP
<http://www.iinteractive.com>
.PP
This library is free software; you can redistribute it and/or modify
it under the same terms as Perl itself.