# $Revision: 709 $$Date: 2005-05-03 17:32:07 -0400 (Tue, 03 May 2005) $$Author: wsnyder $
# Author: Wilson Snyder <wsnyder@wsnyder.org>
######################################################################
#
# Copyright 2002-2005 by Wilson Snyder.  This program is free software;
# you can redistribute it and/or modify it under the terms of either the GNU
# General Public License or the Perl Artistic License.
# 
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
# 
######################################################################

package P4::C4::Cache;
use strict;

our $VERSION = '2.041';

######################################################################
######################################################################
######################################################################
#### Package overrides

package P4::C4;
use P4::C4::Info;
use Data::Dumper;
use File::Spec::Functions;
use strict;

our $CurrentSelf;

sub cacheFilename {
    my $self = shift;
    return catfile($self->clientRoot,".c4cache");
}

sub rmCache {
    my $self = shift;
    # Remove the cache
    unlink $self->cacheFilename;
}

sub readCache {
    my $self = shift;
    # Read the .c4cache into _files

    my $filename = $self->cacheFilename;
    if (-r $filename) {
	print "readCache($filename)\n" if $P4::C4::Debug;
	$CurrentSelf = $self;  # As self isn't known by the "do"
	$! = $@ = undef;
	my $rtn = do $filename;
	(!$@ && $rtn==1) or die "%Error: $filename: $@ / $!\n";
	print "readCacheDone($filename)\n" if $P4::C4::Debug;
    }
}

sub writeCache {
    my $self = shift;
    # Write the .c4cache

    my $filename = $self->cacheFilename;
    my $fh = IO::File->new($filename,"w") or return;  # It's just a cache, after all
    print "writeCache($filename)\n" if $P4::C4::Debug;
    foreach my $file (sort (keys %{$self->{_files}})) {
	my $fref = $self->{_files}{$file};
	(my $filequote = $file) =~ s/\'/\\\'/g;
	print $fh "addCacheFile('$filequote',";
	if ($fref->{clientMtime}) {
	    print $fh "oldMtime=>",$fref->{clientMtime};
	} elsif ($fref->{oldMtime}) {
	    # If we do not have a client time then just store what we had (if anything) 
	    print $fh "oldMtime=>",$fref->{oldMtime};
	}
	print $fh ");\n";
    }
    print $fh "1;\n";
    $fh->close;
}

sub addCacheFile {
    my $self = $CurrentSelf;
    my $filename = shift;
    my %params = (@_);
    # Called by the cached file to add information to the given file's structure
    $self->{_files}{$filename}{filename} = $filename;
    while ((my $key,my $val) = each %params) {
	$self->{_files}{$filename}{$key} = $val;
    }
}

######################################################################
### Package return
1;
__END__

=pod

=head1 NAME

P4::C4::Cache - Caching of file information for Ct

=head1 SYNOPSIS

=head1 DESCRIPTION

This module is for managing file caches for internal P4::C4 use.

=head1 DISTRIBUTION

The latest version is available from CPAN and from L<http://www.veripool.com/>.

Copyright 2002-2005 by Wilson Snyder.  This package is free software; you
can redistribute it and/or modify it under the terms of either the GNU
Lesser General Public License or the Perl Artistic License.

=head1 AUTHORS

Wilson Snyder <wsnyder@wsnyder.org>

=head1 SEE ALSO

L<P4::C4>

=cut