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#-*- perl -*-
#
# Copyright (C) 2001 Ken'ichi Fukamachi
# All rights reserved. This program is free software; you can
# redistribute it and/or modify it under the same terms as Perl itself.
#
# $FML: Array.pm,v 1.18 2001/04/08 13:25:40 fukachan Exp $
#
package IO::Adapter::Array;
use strict;
use vars qw(@ISA @EXPORT @EXPORT_OK $AUTOLOAD);
use Carp;
use IO::Adapter::ErrorStatus qw(error_set error error_clear);
=head1 NAME
IO::Adapter::Array - IO emulation for the ARRAY
=head1 SYNOPSIS
use IO::Adapter::Array;
$map = [ 1, 2, 3 ];
$obj = new IO::Adapter::Array $map;
$obj->open;
while ($x = $obj->get_next_value) { print $x;}
$obj->close;
=head1 DESCRIPTION
emulate IO operation for the ARRAY.
=head1 METHODS
=item C<new()>
constructor.
=cut
# Descriptions: constructor
# Arguments: $self
# Side Effects: none
# Return Value: object
sub new
{
my ($self) = @_;
my ($type) = ref($self) || $self;
my $me = {};
return bless $me, $type;
}
=head2
=item C<open($args)>
open IO for the array. $args is a hash reference.
The option follows:
$args = {
flag => $flag
_array_reference => ARRAY_REFERENCE
}
$flag is "r" only (read only) now.
=cut
# Descriptions: open() emulation
# Arguments: $self $args
# $args = {
# flag => $flag
# _array_reference => ARRAY_REFERENCE
# }
# Side Effects: malloc @elements array
# Return Value: ARRAY REFERENCE
sub open
{
my ($self, $args) = @_;
my $flag = $args->{ flag } || 'r';
my $r_array = $self->{ _array_reference};
if ($flag ne 'r') {
$self->error_set("Error: type=$self->{_type} is read only.");
return undef;
}
# malloc()
my @elements = @$r_array;
$self->{_elements} = $r_array;
$self->{_num_elements} = $#elements;
$self->{_counter} = 0;
return( @elements ? \@elements : undef );
}
=head2
=item C<getline()>
the same as get_next_value().
=item C<get_next_value()>
return the next element of the array
=cut
# Descriptions: forwarded to get_next_value()
sub getline { get_next_value(@_);}
# Descriptions: return the next element of the array
# Arguments: $self $args
# Side Effects: increment the counter in the object
# Return Value: the next element
sub get_next_value
{
my ($self, $args) = @_;
my $i = $self->{_counter}++;
my $ra = $self->{_elements};
defined $$ra[ $i ] ? $$ra[ $i ] : undef;
}
=head2 C<getpos()>
return the current position in the array
=head2 C<setpos($pos)>
set the current position to $pos -th element.
=cut
# Descriptions: return the current position in the array, that is,
# which element in the array
# Arguments: $self
# Side Effects: none
# Return Value: the current number of element
sub getpos
{
my ($self) = @_;
return $self->{_counter};
}
# Descriptions: set the postion in the array
# Arguments: $self $pos
# $pos is the integer number.
# Side Effects: reset counter in the object
# Return Value: update position
sub setpos
{
my ($self, $pos) = @_;
$self->{_counter} = $pos;
}
=head2 C<eof()>
whether the current position reaches the end of the array or not.
If it already reaches the end, return 1.
=head2 C<close()>
end of IO operation. It is a dummy.
=cut
# Descriptions: whether end of the array is not now
# Arguments: $self
# Side Effects: none
# Return Value: 1 or 0.
# return 1 if the element reaches the end of the array.
sub eof
{
my ($self) = @_;
$self->{_counter} > $self->{_num_elements} ? 1 : 0;
}
# Descriptions: close() is a fake.
# Arguments: $self
# Side Effects: none
# Return Value: none
sub close
{
my ($self) = @_;
}
=head1 AUTHOR
Ken'ichi Fukamachi
=head1 COPYRIGHT
Copyright (C) 2001 Ken'ichi Fukamachi
All rights reserved. This program is free software; you can
redistribute it and/or modify it under the same terms as Perl itself.
=head1 HISTORY
IO::Adapter::Array appeared in fml5 mailing list driver package.
See C<http://www.fml.org/> for more details.
=cut
1;
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