SYNOPSIS

use Tree::Simple::Visitor::CreateDirectoryTree;
# create a Tree::Simple object which
# represents a directory hierarchy
my $tree = Tree::Simple->new("www/")
->addChildren(
Tree::Simple->new("conf/")
->addChildren(
Tree::Simple->new("startup.pl"),
Tree::Simple->new("httpd.conf")
),
Tree::Simple->new("cgi-bin/"),
Tree::Simple->new("ht_docs/"),
Tree::Simple->new("logs/")
->addChildren(
Tree::Simple->new("error.log"),
Tree::Simple->new("access.log")
),
);
# create an instance of our visitor
my $visitor = Tree::Simple::Visitor::CreateDirectoryTree->new();
# pass the visitor to a Tree::Simple object
$tree->accept($visitor);
# the www/ directory now mirrors the structure of the tree

DESCRIPTION

This visitor can be used to create a set of directories and files from a Tree::Simple object hierarchy.

METHODS

new

There are no arguments to the constructor the object will be in its default state. You can use the "setNodeFilter", "setFileHandler" and "setDirectoryHandler" 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 used to create the directory tree, it can be basically used as a node pre-processor. An example usage of this might be to enforce the 8.3 naming rules of DOS, or the 32 character limit of older macintoshes.

setFileHandler ($file_handler)

This method accepts a CODE reference as its $file_handler argument and throws an exception if it is not a CODE reference. This method can be used to create custom file creation behavior. The default behavior is to just create the file and nothing else, but by using this method it is possible to implement some other custom behavior, such as creating a file based on a template. The function is passed the full path of the file to be created (as built by File::Spec).

setDirectoryHandler ($dir_handler)

This method accepts a CODE reference as its $dir_handler argument and throws an exception if it is not a CODE reference. This method can be used to create custom directory creation behavior. The default behavior is to just create the directory and nothing else, but by using this method it is possible to implement some other custom behavior, such as creating a directory on a remote server. The function is passed the full path of the directory to be created (as built by File::Spec).

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.

The tree is processed as follows:

Any node which is not a leaf is considered a directory.

Obviously since files themselves are leaf nodes, this makes sense that non-leaves will be directories.

Any node (including leaf nodes) which ends in either the character "/" or "\" is considered a directory.

I think it is a pretty standard convention to have directory names ending in a separator. The separator itself is stripped off before the directory name is passed to File::Spec where the platform specific directory path is created. This means that it does not matter which one you use, it will be completely cross platform (at least as cross-platform as File::Spec is).

All other nodes are considered to be files.

CODE COVERAGE

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

AUTHOR

stevan little, <[email protected]>

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.