# Copyright 2011-2026, Paul Johnson (paul@pjcj.net)

# This software is free.  It is licensed under the same terms as Perl itself.

# The latest version of this software should be available from my homepage:
# https://pjcj.net

package Devel::Cover::DB::Digests;

use strict;
use warnings;

our $VERSION = '1.52'; # VERSION

use Devel::Cover::DB::Structure;
use Devel::Cover::DB::IO;

my $File = "digests";

sub new {
  my $class = shift;
  my $self  = { digests => {}, @_ };

  die "No db specified" unless $self->{db};
  $self->{file} = "$self->{db}/$File";

  bless $self, $class;
  $self->read;
  $self
}

sub read {
  my $self = shift;
  my $io   = Devel::Cover::DB::IO->new;
  $self->{digests} = $io->read($self->{file}) if -e $self->{file};
  $self
}

sub write {
  my $self = shift;
  my $io   = Devel::Cover::DB::IO->new;
  $io->write($self->{digests}, $self->{file});
  $self
}

sub get {
  my $self = shift;
  my ($digest) = @_;
  $self->{digests}{$digest}
}

sub set {
  my $self = shift;
  my ($file, $digest) = @_;
  $self->{digests}{$digest} = $file;
}

sub canonical_file {
  my $self = shift;
  my ($file) = @_;

  my $cfile  = $file;
  my $digest = Devel::Cover::DB::Structure->digest($file);
  if ($digest) {
    my $dfile = $self->get($digest);
    if ($dfile && $dfile ne $file) {
      print STDERR "Devel::Cover: Adding coverage for $file to $dfile\n"
        unless $Devel::Cover::Silent;
      $cfile = $dfile;
    } else {
      $self->set($file, $digest);
    }
  }

  # warn "[$file] => [$cfile]\n";

  $cfile
}

1

__END__

=head1 NAME

Devel::Cover::DB::Digests - store digests for Devel::Cover::DB

=head1 VERSION

version 1.52

=head1 SYNOPSIS

 use Devel::Cover::DB::Digests;
 my $digests = Devel::Cover::DB::Digests->new(db => $DB);
 $digests->read;
 $digests->write;

=head1 DESCRIPTION

This module stores digests for Devel::Cover::DB.

=head1 SEE ALSO

 Devel::Cover
 Devel::Cover::DB

=head1 METHODS

=head2 new

 my $digests = Devel::Cover::DB::Digests->new(db => $DB);

Constructs the digests object.

=head2 read

 $digests->read;

Read the digests from the DB.

=head2 write

 $digests->write;

Write the digests to the DB.

=head1 LICENCE

Copyright 2011-2026, Paul Johnson (paul@pjcj.net)

This software is free.  It is licensed under the same terms as Perl itself.

The latest version of this software should be available from my homepage:
https://pjcj.net

=cut
