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.\" ========================================================================
.\"
.IX Title "Razor2::Errorhandler 3pm"
.TH Razor2::Errorhandler 3pm "2005-08-03" "perl v5.14.2" "User Contributed Perl Documentation"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
.if n .ad l
.nh
.SH "NAME"
Razor::Errorhandler \- Error handling mechanism for Razor.
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\&    package Foo;
\&
\&    use Razor::Errorhandler;
\&    @ISA = qw(Razor::Errorhandler);
\&
\&    sub alive { 
\&        ..
\&        ..
\&        return 
\&        $self\->error ("Awake, awake! Ring the alarum bell. \e
\&                       Murther and treason!", $dagger) 
\&            if $self\->murdered($king);
\&    }
\&
\&
\&    package main; 
\&
\&    use Foo;
\&    my $foo = new Foo;
\&    $foo\->alive($king) or print $foo\->errstr(); 
\&    # prints "Awake, awake! ... "
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
Razor::Errorhandler encapsulates the error handling mechanism used by the
modules in Razor bundle. Razor::Errorhandler doesn't have a constructor
and is meant to be inherited. The derived modules use its two methods,
\&\fIerror()\fR and \fIerrstr()\fR, to communicate error messages to the caller.
.PP
When a method of the derived module fails, it calls \f(CW$self\fR\->\fIerror()\fR and
returns  to the caller. The error message passed to \fIerror()\fR is made
available to the caller through the \fIerrstr()\fR accessor. \fIerror()\fR also
accepts a list of sensitive data that it wipes out (undef'es) before
returning.
.PP
The caller should \fBnever\fR call \fIerrstr()\fR to check for errors. \fIerrstr()\fR
should be called only when a method indicates (usually through an undef
return value) that an error has occured. This is because \fIerrstr()\fR is
never overwritten and will always contain a value after the occurance of
first error.
.SH "METHODS"
.IX Header "METHODS"
.ie n .IP "\fBerror($mesage, ($wipeme, \fB$wipemetoo\fB))\fR" 4
.el .IP "\fBerror($mesage, ($wipeme, \f(CB$wipemetoo\fB))\fR" 4
.IX Item "error($mesage, ($wipeme, $wipemetoo))"
The first argument to \fIerror()\fR is \f(CW$message\fR which is placed in
\&\f(CW$self\fR\->{errstr} and the remaining arguments are interpretted as variables
containing sensitive data that are wiped out from the memory. \fIerror()\fR
always returns undef.
.IP "\fB\f(BIerrstr()\fB\fR" 4
.IX Item "errstr()"
\&\fIerrstr()\fR is an accessor method for \f(CW$self\fR\->{errstr}.
.SH "AUTHOR"
.IX Header "AUTHOR"
Vipul Ved Prakash, <mail@vipul.net>
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\fIRazor::Client\fR\|(3)