[%# # IMPORTANT NOTE # This documentation is generated automatically from source # templates. Any changes you make here may be lost. # # The 'docsrc' documentation source bundle is available for download # from http://www.template-toolkit.org/docs.html and contains all # the source templates, XML files, scripts, etc., from which the # documentation for the Template Toolkit is built. -%] [% META book = 'Modules' page = 'Exception' %] [% WRAPPER toc; PROCESS tocitem title ="SYNOPSIS" subs = []; PROCESS tocitem title ="DESCRIPTION" subs = []; PROCESS tocitem title ="AUTHOR" subs = []; PROCESS tocitem title ="VERSION" subs = []; PROCESS tocitem title ="COPYRIGHT" subs = []; PROCESS tocitem title ="SEE ALSO" subs = []; END %] [% WRAPPER section title="SYNOPSIS" -%]

        use Template::Exception;

        my $exception = Template::Exception->new($type, $info);
        $type = $exception->type;
        $info = $exception->info;
        ($type, $info) = $exception->type_info;

        print $exception->as_string();

        $handler = $exception->select_handler(\@candidates);

[%- END %] [% WRAPPER section title="DESCRIPTION" -%]

The Template::Exception module defines an object class for representing exceptions within the template processing life cycle. Exceptions can be raised by modules within the Template Toolkit, or can be generated and returned by user code bound to template variables.

Exceptions can be raised in a template using the THROW directive,

        [% tt_start_tag %] THROW user.login 'no user id: please login' [% tt_end_tag %]

or by calling the throw() method on the current Template::Context object,

        $context->throw('user.passwd', 'Incorrect Password');
        $context->throw('Incorrect Password');    # type 'undef'

or from Perl code by calling die() with a Template::Exception object,

        die (Template::Exception->new('user.denied', 'Invalid User ID'));

or by simply calling die() with an error string. This is automagically caught and converted to an exception of 'undef' type which can then be handled in the usual way.

        die "I'm sorry Dave, I can't do that";

Each exception is defined by its type and a information component (e.g. error message). The type can be any identifying string and may contain dotted components (e.g. 'foo', 'foo.bar', 'foo.bar.baz'). Exception types are considered to be hierarchical such that 'foo.bar' would be a specific type of the more general 'foo' type.

[%- END %] [% WRAPPER section title="AUTHOR" -%]

Andy Wardley <abw@andywardley.com>

[% ttlink('http://www.andywardley.com/', 'http://www.andywardley.com/') -%]

[%- END %] [% WRAPPER section title="VERSION" -%]

2.65, distributed as part of the Template Toolkit version 2.14, released on 04 October 2004.

[%- END %] [% WRAPPER section title="COPYRIGHT" -%]

      Copyright (C) 1996-2004 Andy Wardley.  All Rights Reserved.
      Copyright (C) 1998-2002 Canon Research Centre Europe Ltd.

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

[%- END %] [% WRAPPER section title="SEE ALSO" -%]

[% ttlink('Template', 'Template') -%], [% ttlink('Template::Context', 'Template::Context') -%]

[%- END %]