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Class::ErrorHandler - Base class for error handling
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 $foo->errstr;
Class::ErrorHandler provides an error-handling mechanism that's generic enough to be used as the base class for a variety of OO classes. Subclasses inherit its two error-handling methods, error and errstr, to communicate error messages back to the calling program.
On failure (for whatever reason), a subclass should call error and return
to the caller; error itself sets the error message internally, then
returns undef. This has the effect of the method that failed returning
undef to the caller. The caller should check for errors by checking for a
return value of undef, and calling errstr to get the value of the
error message on an error.
As demonstrated in the SYNOPSIS, error and errstr work as both class methods and object methods.
error($message)
error($message)Sets the error message for either the class Class or the object
$object to the message $message. Returns undef.
Accesses the last error message set in the class Class or the object $object, respectively, and returns that error message.
Class::ErrorHandler is free software; you may redistribute it and/or modify it under the same terms as Perl itself.
Except where otherwise noted, Class::ErrorHandler is Copyright 2004 Benjamin Trott, cpan@stupidfool.org. All rights reserved.