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.\" ========================================================================
.\"
.IX Title "Mason::Manual::Subclasses 3pm"
.TH Mason::Manual::Subclasses 3pm "2014-02-01" "perl v5.18.2" "User Contributed Perl Documentation"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
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.SH "NAME"
Mason::Manual::Subclasses \- Creating custom subclasses of Mason's classes
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
You can subclass the following Mason classes for your application:
.PP
.Vb 9
\&    Mason::CodeCache
\&    Mason::Compilation
\&    Mason::Component
\&    Mason::Component::ClassMeta
\&    Mason::Component::Import
\&    Mason::Component::Moose
\&    Mason::Interp
\&    Mason::Request
\&    Mason::Result
.Ve
.PP
and arrange things so that Mason always uses your subclass instead of its
default class.
.PP
Note: if you want to create a general purpose modification to Mason to use in
multiple applications, you should probably create a
plugin instead of a subclass.
.SH "CREATING A SUBCLASS"
.IX Header "CREATING A SUBCLASS"
A subclass should look something like this:
.PP
.Vb 3
\&    package My::Mason::Interp;
\&    use Moose;
\&    extends \*(AqMason::Interp\*(Aq;
\&
\&    # put your modifications here
\&
\&    1;
.Ve
.SH "LETTING MASON KNOW ABOUT YOUR SUBCLASSES"
.IX Header "LETTING MASON KNOW ABOUT YOUR SUBCLASSES"
There are two ways to let Mason know about your subclasses: by naming
convention, and by parameters to \f(CW\*(C`Mason\->new\*(C'\fR.
.SS "By naming convention"
.IX Subsection "By naming convention"
First, create a subclass of Mason itself:
.PP
.Vb 3
\&    package My::Mason;
\&    use Moose;
\&    extends \*(AqMason\*(Aq;
\&
\&    1;
.Ve
.PP
and use that in place of \f(CW\*(C`Mason\*(C'\fR in construction:
.PP
.Vb 1
\&    my $interp = My::Mason\->new();
.Ve
.PP
Now, you can place any subclasses under 'My::Mason' and they'll automatically
be picked up. e.g.
.PP
.Vb 3
\&    My::Mason::Compilation
\&    My::Mason::Interp
\&    My::Mason::Request
.Ve
.SH "By constructor parameter"
.IX Header "By constructor parameter"
You can specify your subclasses via \*(L"base_*\*(R" parameters to \f(CW\*(C`Mason\->new()\*(C'\fR.
e.g.
.PP
.Vb 5
\&    my $interp = Mason\->new(
\&         base_compilation_class => \*(AqMy::Mason::Compilation\*(Aq,
\&         base_interp_class => \*(AqMy::Mason::Interp\*(Aq
\&         base_request_class => \*(AqSome::Other::Mason::Request\*(Aq
\&    );
.Ve
.PP
See \*(L"\s-1CUSTOM MASON CLASSES\*(R"\s0 in Mason::Interp for a complete list.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
Mason
.SH "AUTHOR"
.IX Header "AUTHOR"
Jonathan Swartz <swartz@pobox.com>
.SH "COPYRIGHT AND LICENSE"
.IX Header "COPYRIGHT AND LICENSE"
This software is copyright (c) 2012 by Jonathan Swartz.
.PP
This is free software; you can redistribute it and/or modify it under
the same terms as the Perl 5 programming language system itself.