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package Class::Meta::Types::Numeric;
# $Id: Numeric.pm 3937 2008-05-22 03:04:22Z david $
=head1 NAME
Class::Meta::Types::Numeric - Numeric data types
=head1 SYNOPSIS
package MyApp::Thingy;
use strict;
use Class::Meta;
use Class::Meta::Types::Numeric;
# OR...
# use Class::Meta::Types::Numeric 'affordance';
# OR...
# use Class::Meta::Types::Numeric 'semi-affordance';
BEGIN {
# Create a Class::Meta object for this class.
my $cm = Class::Meta->new( key => 'thingy' );
# Add an integer attribute.
$cm->add_attribute( name => 'age',
type => 'integer' );
$cm->build;
}
=head1 DESCRIPTION
This module provides numeric data types for use with Class::Meta attributes.
Simply load it, then pass the name of one of its types to the
C<add_attribute()> method of a Class::Meta object to create attributes of the
numeric data type. See L<Class::Meta::Type|Class::Meta::Type> for more
information on using and creating data types.
The validation checks for Class::Meta::Types::Numeric are provided by the
Data::Types module. Consult its documentation to find out what it considers to
be a number and what's not.
The data types created by Class::Meta::Types::Numeric are:
=over
=item whole
A whole number. That is, a positive integer.
=item integer
=item int
An integer number.
=item decimal
=item dec
A decimal number.
=item real
A real number.
=item float
A floating point number.
=back
=cut
use strict;
use Class::Meta::Type;
use Data::Types ();
our $VERSION = '0.63';
# This code ref builds value checkers.
my $mk_chk = sub {
my ($code, $type) = @_;
return [
sub {
return unless defined $_[0];
$code->($_[0])
or $_[2]->class->handle_error("Value '$_[0]' is not a valid "
. "$type");
}
];
};
##############################################################################
sub import {
my ($pkg, $builder) = @_;
$builder ||= 'default';
return if eval { Class::Meta::Type->new('whole') };
Class::Meta::Type->add(
key => "whole",
name => "Whole Number",
desc => "Whole number",
builder => $builder,
check => $mk_chk->(\&Data::Types::is_whole, 'whole number'),
);
Class::Meta::Type->add(
key => "integer",
name => "Integer",
desc => "Integer",
alias => 'int',
builder => $builder,
check => $mk_chk->(\&Data::Types::is_int, 'integer'),
);
Class::Meta::Type->add(
key => "decimal",
name => "Decimal Number",
desc => "Decimal number",
alias => 'dec',
builder => $builder,
check => $mk_chk->(\&Data::Types::is_decimal, 'decimal number'),
);
Class::Meta::Type->add(
key => "real",
name => "Real Number",
desc => "Real number",
builder => $builder,
check => $mk_chk->(\&Data::Types::is_real, 'real number'),
);
Class::Meta::Type->add(
key => "float",
name => "Floating Point Number",
desc => "Floating point number",
builder => $builder,
check => $mk_chk->(\&Data::Types::is_float, 'floating point number'),
);
}
1;
__END__
=head1 SUPPORT
This module is stored in an open repository at the following address:
L<https://svn.kineticode.com/Class-Meta/trunk/>
Patches against Class::Meta are welcome. Please send bug reports to
<bug-class-meta@rt.cpan.org>.
=head1 AUTHOR
David Wheeler <david@kineticode.com>
=head1 SEE ALSO
Other classes of interest within the Class::Meta distribution include:
=over 4
=item L<Class::Meta|Class::Meta>
This class contains most of the documentation you need to get started with
Class::Meta.
=item L<Class::Meta::Type|Class::Meta::Type>
This class manages the creation of data types.
=item L<Class::Meta::Attribute|Class::Meta::Attribute>
This class manages Class::Meta class attributes, all of which are based on
data types.
=back
Other data type modules:
=over 4
=item L<Class::Meta::Types::Perl|Class::Meta::Types::Perl>
=item L<Class::Meta::Types::String|Class::Meta::Types::String>
=item L<Class::Meta::Types::Boolean|Class::Meta::Types::Boolean>
=back
=head1 COPYRIGHT AND LICENSE
Copyright (c) 2002-2008, David Wheeler. Some Rights Reserved.
This module is free software; you can redistribute it and/or modify it under
the same terms as Perl itself.
=cut
|
