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.\" ========================================================================
.\"
.IX Title "Config::Model::BackendTrackOrder 3pm"
.TH Config::Model::BackendTrackOrder 3pm "2023-08-19" "perl v5.36.0" "User Contributed Perl Documentation"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
.if n .ad l
.nh
.SH "NAME"
Config::Model::BackendTrackOrder \- Track read order of elements from configuration
.SH "VERSION"
.IX Header "VERSION"
version 2.153
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 2
\& # inside a backend
\& use Config::Model::BackendTrackOrder;
\&
\& has tracker => (
\&    is => \*(Aqro\*(Aq,
\&    isa => \*(AqConfig::Model::BackendTrackOrder\*(Aq,
\&    lazy_build => 1,
\& );
\&
\& sub _build_tracker {
\&    my $self = shift;
\&    return Config::Model::BackendTrackOrder\->new(
\&        backend_obj => $self,
\&        node => $self\->node,
\&    ) ;
\& }
\&
\& # register elements to record user order
\& $self\->tracker\->register_element(\*(Aqfoo\*(Aq);
\& $self\->tracker\->register_element(\*(Aqbar\*(Aq);
\&
\& # later, when writing data back
\& foreach my $elt ( $self\->tracker\->get_ordered_element_names ) {
\&      # write data
\& }
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
This module is used by backends to record the order of the
configuration elements found in user file. Later these elements can be
written back in the file using the same order.
.PP
Data are written in canonical order if \f(CW\*(C`canonical\*(C'\fR method of the
\&\*(L"Config::Model::Instance\*(R" in instance returns true.
.SH "CONSTRUCTOR"
.IX Header "CONSTRUCTOR"
THe constructor accepts the following parameters:
.IP "backend_obj" 4
.IX Item "backend_obj"
The backend object holding this tracker (required).
.IP "node" 4
.IX Item "node"
The node holding the backend above
.SH "METHODS"
.IX Header "METHODS"
.SS "register_element"
.IX Subsection "register_element"
Register the element and keep track of the registration order during
initial load
.PP
Element registered after initial load (i.e . user modification) are
registered using canonical order.
.SS "get_ordered_element_names"
.IX Subsection "get_ordered_element_names"
Returns a list of elements respecting user's order.
.PP
Returns the canonical list if Instance canonical attribute is 1.
.SH "AUTHOR"
.IX Header "AUTHOR"
Dominique Dumont
.SH "COPYRIGHT AND LICENSE"
.IX Header "COPYRIGHT AND LICENSE"
This software is Copyright (c) 2005\-2022 by Dominique Dumont.
.PP
This is free software, licensed under:
.PP
.Vb 1
\&  The GNU Lesser General Public License, Version 2.1, February 1999
.Ve