Tree::File - store a data structure in a file tree
use Tree::File::Subclass; my $tree = Tree::File::Subclass->new($treerot); die "death mandated" if $tree->get("/master/die") print "Hello, ", $tree->get("/login/user/name"); $tree->set("/login/user/lastlogin", time); $tree->write;
This module stores configuration in a series of files spread across a directory tree, and provides uniform access to the data structure.
It can load a single file or a directory tree containing files as leaves. The tree's branches can be returned as data structures, and the tree can be modified and rewritten. Directory-based branches can be collapsed back into files and file-based branches can be exploded into directories.
This loads the tree at the named root, which may be a file or a directory. The
%arg hash is optional, the following options are recognized:
readonly - if true, set and delete methods croak (default: false) preload - the number of levels of directories to preload (default: none) pass -1 to preload as deep as required found - a closure called when a node or value is found; it is passed the Tree::File object, the id requested, and the data retrieved; it should apply any transformations and return the 'real' value desired. not_found - a closure called if a node cannot be found; it is passed the id requested and the root of the last node reached; by default, Tree::File will return undef in this situation
This method is used internally by Tree::File subclasses, which must implement it. Given the name of a file on disk, this method returns the data structure contained in the file.
This returns the branch with the given name. If the name contains slashes, they indicate recursive fetches, so that these two calls are identical:
Leading slashes are ignored.
If a second, true argument is passed to
get, any missing data structures will be autovivified as needed to get to the leaf.
This sets the identified branch's value to the given value. Hash references are automatically expanded into trees.
This method deletes the identified branch (and returns the deleted value).
This method deletes the value at the old id and places it at the new id.
This method returns the path to this node from the root.
This method retuns the base name of the node. (If, for example, the path to the node is "/things/good/all" then its base name is "all".)
This method returns the names of all the nodes beneath this branch.
This method returns each node beneath this branch.
This method returns all the nodes on this branch which are also branches (that is, are also Tree::File objects).
This method returns the entire tree of data as an unblessed Perl data structure.
This method forces the object to write itself out to disk. It will write out branches to directories if a directory for the branch already exists, or if it was orginally loaded as a directory.
This method is used by Tree::File's
write method. It must be implement in subclasses of Tree::File. Given the name of a file on disk and a data structure, this method writes the data structure to the file.
This method returns the branch type for the given branch. If
$type is defined and one of "dir" or "file" it will set the type and return the new value.
These methods set the type of the branch to "dir" and "file" respectively.
Please report any bugs or feature requests to
firstname.lastname@example.org, or through the web interface at http://rt.cpan.org. I will be notified, and then you'll automatically be notified of progress on your bug as I make changes.
Copyright 2005 Ricardo Signes, All Rights Reserved.
This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself.