1Tree::Simple::Visitor::ULsoeardDCiornetcrtiobruytTTerrdeeeeP:(e:3rS)limDpolceu:m:eVnitsaittioorn::LoadDirectoryTree(3)
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NAME

6       Tree::Simple::Visitor::LoadDirectoryTree - A Visitor for loading the
7       contents of a directory into a Tree::Simple object
8

SYNOPSIS

10         use Tree::Simple::Visitor::LoadDirectoryTree;
11
12         # create a Tree::Simple object whose
13         # node is path to a directory
14         my $tree = Tree::Simple->new("./");
15
16         # create an instance of our visitor
17         my $visitor = Tree::Simple::Visitor::LoadDirectoryTree->new();
18
19         # set the directory sorting style
20         $visitor->setSortStyle($visitor->SORT_FILES_FIRST);
21
22         # create node filter to filter
23         # out certain files and directories
24         $visitor->setNodeFilter(sub {
25             my ($item) = @_;
26             return 0 if $item =~ /CVS/;
27             return 1;
28         });
29
30         # pass the visitor to a Tree::Simple object
31         $tree->accept($visitor);
32
33         # the tree now mirrors the structure of the directory
34

DESCRIPTION

36       This visitor can be used to load a directory tree into a Tree::Simple
37       hierarchy.
38

METHODS

40       new There are no arguments to the constructor the object will be in its
41           default state. You can use the "setNodeFilter" and "setSortStyle"
42           methods to customize its behavior.
43
44       setNodeFilter ($filter_function)
45           This method accepts a CODE reference as its $filter_function
46           argument and throws an exception if it is not a code reference.
47           This code reference is used to filter the tree nodes as they are
48           created. The function is given the current directory or file being
49           added to the tree, and it is expected to return either true (1) of
50           false (0) to determine if that directory should be traversed or
51           file added to the tree.
52
53       setSortStyle ($sort_function)
54           This method accepts a CODE reference as its $sort_function argument
55           and throws an exception if it is not a code reference. This
56           function is used to sort the individual levels of the directory
57           tree right before it is added to the tree being built. The function
58           is passed the current path, followed by the two items being sorted.
59           The reason for passing the path in is so that sorting operations
60           can be performed on the entire path if desired.
61
62           Two pre-built functions are supplied and described below.
63
64           SORT_FILES_FIRST
65               This sorting function will sort files before directories, so
66               that files are sorted alphabetically first in the list followed
67               by directories sorted alphabetically. Here is example of how
68               that would look:
69
70                   Tree/
71                       Simple.pm
72                       Simple/
73                           Visitor.pm
74                           VisitorFactory.pm
75                           Visitor/
76                               PathToRoot.pm
77
78           SORT_DIRS_FIRST
79               This sorting function will sort directories before files, so
80               that directories are sorted alphabetically first in the list
81               followed by files sorted alphabetically. Here is example of how
82               that would look:
83
84                   Tree/
85                       Simple/
86                           Visitor/
87                               PathToRoot.pm
88                           Visitor.pm
89                           VisitorFactory.pm
90                       Simple.pm
91
92       visit ($tree)
93           This is the method that is used by Tree::Simple's "accept" method.
94           It can also be used on its own, it requires the $tree argument to
95           be a Tree::Simple object (or derived from a Tree::Simple object),
96           and will throw and exception otherwise.
97
98           The node value of the $tree argument (gotten by calling
99           "getNodeValue") is considered the root directory from which we
100           begin our traversal. We use File::Spec to keep our paths cross-
101           platform, but it is expected that you will feed in a valid path for
102           your OS. If the path either does not exist, or is not a directory,
103           then an exception is thrown.
104
105           The $tree argument which is passed to "visit" must be a leaf node.
106           This is because this Visitor will create all the sub-nodes for this
107           tree. If the tree is not a leaf, an exception is thrown. We do not
108           require the tree to be a root though, and this Visitor will not
109           affect any nodes above the $tree argument.
110

BUGS

112       None that I am aware of. Of course, if you find a bug, let me know, and
113       I will be sure to fix it.
114

CODE COVERAGE

116       See the CODE COVERAGE section in Tree::Simple::VisitorFactory for more
117       information.
118

SEE ALSO

120       These Visitor classes are all subclasses of Tree::Simple::Visitor,
121       which can be found in the Tree::Simple module, you should refer to that
122       module for more information.
123

AUTHOR

125       stevan little, <stevan@iinteractive.com>
126

128       Copyright 2004, 2005 by Infinity Interactive, Inc.
129
130       <http://www.iinteractive.com>
131
132       This library is free software; you can redistribute it and/or modify it
133       under the same terms as Perl itself.
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137perl v5.30.0                      20T1r9e-e0:7:-S2i6mple::Visitor::LoadDirectoryTree(3)
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