oracular (3) Tree::Simple::Visitor::LoadDirectoryTree.3pm.gz

NAME

       Tree::Simple::Visitor::LoadDirectoryTree - A Visitor for loading the contents of a directory into a
       Tree::Simple object

SYNOPSIS

         use Tree::Simple::Visitor::LoadDirectoryTree;

         # create a Tree::Simple object whose
         # node is path to a directory
         my $tree = Tree::Simple->new("./");

         # create an instance of our visitor
         my $visitor = Tree::Simple::Visitor::LoadDirectoryTree->new();

         # set the directory sorting style
         $visitor->setSortStyle($visitor->SORT_FILES_FIRST);

         # create node filter to filter
         # out certain files and directories
         $visitor->setNodeFilter(sub {
             my ($item) = @_;
             return 0 if $item =~ /CVS/;
             return 1;
         });

         # pass the visitor to a Tree::Simple object
         $tree->accept($visitor);

         # the tree now mirrors the structure of the directory

DESCRIPTION

       This visitor can be used to load a directory tree into a Tree::Simple hierarchy.

METHODS

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

       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 function is given the current directory or file being added to the tree, and it is expected to
           return either true (1) of false (0) to determine if that directory should be traversed or file added
           to the tree.

       setSortStyle ($sort_function)
           This method accepts a CODE reference as its $sort_function argument and throws an exception if it is
           not a code reference. This function is used to sort the individual levels of the directory tree right
           before it is added to the tree being built. The function is passed the current path, followed by the
           two items being sorted. The reason for passing the path in is so that sorting operations can be
           performed on the entire path if desired.

           Two pre-built functions are supplied and described below.

           SORT_FILES_FIRST
               This sorting function will sort files before directories, so that files are sorted alphabetically
               first in the list followed by directories sorted alphabetically. Here is example of how that
               would look:

                   Tree/
                       Simple.pm
                       Simple/
                           Visitor.pm
                           VisitorFactory.pm
                           Visitor/
                               PathToRoot.pm

           SORT_DIRS_FIRST
               This sorting function will sort directories before files, so that directories are sorted
               alphabetically first in the list followed by files sorted alphabetically. Here is example of how
               that would look:

                   Tree/
                       Simple/
                           Visitor/
                               PathToRoot.pm
                           Visitor.pm
                           VisitorFactory.pm
                       Simple.pm

       visit ($tree)
           This is the method that is used by the Tree::Simple "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.

           The node value of the $tree argument (gotten by calling "getNodeValue") is considered the root
           directory from which we begin our traversal. We use File::Spec to keep our paths cross-platform, but
           it is expected that you will feed in a valid path for your OS. If the path either does not exist, or
           is not a directory, then an exception is thrown.

           The $tree argument which is passed to "visit" must be a leaf node. This is because this Visitor will
           create all the sub-nodes for this tree. If the tree is not a leaf, an exception is thrown. We do not
           require the tree to be a root though, and this Visitor will not affect any nodes above the $tree
           argument.

Repository

       <https://github.com/ronsavage/Tree-Simple-VisitorFactory>

SUPPORT

       Bugs should be reported via the CPAN bug tracker at

       <https://github.com/ronsavage/Tree-Simple-VisitorFactory/issues>

CODE COVERAGE

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

SEE ALSO

       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.

AUTHOR

       stevan little, <stevan@iinteractive.com>

COPYRIGHT AND LICENSE

       Copyright 2004, 2005 by Infinity Interactive, Inc.

       <http://www.iinteractive.com>

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