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File Name : ErrorHandler.pm

# $Id: ErrorHandler.pm,v 1.1.1.1 2004/08/15 14:55:43 btrott Exp $

package Class::ErrorHandler;
use strict;

use vars qw( $VERSION $ERROR );
$VERSION = '0.03';

sub error {
    my $msg = $_[1] || '';
    if (ref($_[0])) {
        $_[0]->{_errstr} = $msg;
    } else {
        $ERROR = $msg;
    }
    return;
}

sub errstr {
    ref($_[0]) ? $_[0]->{_errstr} : $ERROR
}

1;
__END__

=for stopwords errstr

=head1 NAME

Class::ErrorHandler - Base class for error handling

=head1 SYNOPSIS

package Foo;
    use base qw( Class::ErrorHandler );

sub class_method {
        my $class = shift;
        ...
        return $class->error("Help!")
            unless $continue;
    }

sub object_method {
        my $obj = shift;
        ...
        return $obj->error("I am no more")
            unless $continue;
    }

package main;
    use Foo;

Foo->class_method or die Foo->errstr;

my $foo = Foo->new;
    $foo->object_method or die $foo->errstr;

=head1 DESCRIPTION

I<Class::ErrorHandler> provides an error-handling mechanism that's generic
enough to be used as the base class for a variety of OO classes. Subclasses
inherit its two error-handling methods, I<error> and I<errstr>, to
communicate error messages back to the calling program.

On failure (for whatever reason), a subclass should call I<error> and return
to the caller; I<error> itself sets the error message internally, then
returns C<undef>. This has the effect of the method that failed returning
C<undef> to the caller. The caller should check for errors by checking for a
return value of C<undef>, and calling I<errstr> to get the value of the
error message on an error.

As demonstrated in the L<SYNOPSIS>, I<error> and I<errstr> work as both class
methods and object methods.

=head1 USAGE

=head2 Class->error($message)

=head2 $object->error($message)

Sets the error message for either the class I<Class> or the object
I<$object> to the message I<$message>. Returns C<undef>.

=head2 Class->errstr

=head2 $object->errstr

Accesses the last error message set in the class I<Class> or the
object I<$object>, respectively, and returns that error message.

=head1 LICENSE

This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself.

=head1 AUTHOR & COPYRIGHT

=cut

Name	Type	Size	Owner/Group	Permission	Last Modified	Actions
.	dir	-	root/root	0755	2023-08-25 11:53:16
..	dir	-	root/root	0755	2023-08-25 12:05:20
Accessor	dir	-	root/root	0755	2023-08-25 11:52:56
Autouse	dir	-	root/root	0755	2023-08-25 11:53:16
Data	dir	-	root/root	0755	2023-08-25 11:52:51
Factory	dir	-	root/root	0755	2023-08-25 11:52:59
Inspector	dir	-	root/root	0755	2023-08-25 11:52:52
Load	dir	-	root/root	0755	2023-08-25 11:53:02
Method	dir	-	root/root	0755	2023-08-25 11:52:58
Std	dir	-	root/root	0755	2023-08-25 11:52:55
Virtually	dir	-	root/root	0755	2023-08-25 11:53:15
Accessor.pm	text/plain	20.2 KB	root/root	0644	2009-09-15 04:16:41
Autouse.pm	text/plain	38.09 KB	root/root	0644	2012-02-03 07:55:57
ErrorHandler.pm	text/plain	2.38 KB	root/root	0644	2014-01-14 02:53:29
ISA.pm	text/plain	6.89 KB	root/root	0644	2009-09-29 08:44:18
Inner.pm	text/plain	4.46 KB	root/root	0644	2009-11-21 10:33:49
Inspector.pm	text/plain	16.72 KB	root/root	0644	2012-10-19 09:17:12
Load.pm	text/plain	9.54 KB	root/root	0644	2012-07-15 09:18:44
Mix.pm	text/plain	6.7 KB	root/root	0644	2014-12-18 03:01:33
ReturnValue.pm	text/plain	6.97 KB	root/root	0644	2007-08-20 08:39:48
Singleton.pm	text/plain	12.04 KB	root/root	0644	2007-09-28 08:18:04
Std.pm	text/plain	73.73 KB	root/root	0644	2017-01-24 02:41:28
Tiny.pm	text/plain	17.5 KB	root/root	0644	2016-09-10 06:47:59
Virtual.pm	text/plain	5.51 KB	root/root	0644	2016-08-06 08:05:40

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