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.\" ========================================================================
.\"
.IX Title "Rose::Object::MakeMethods::DateTime 3pm"
.TH Rose::Object::MakeMethods::DateTime 3pm "2010-10-17" "perl v5.18.1" "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"
Rose::Object::MakeMethods::DateTime \- Create methods that store DateTime objects.
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\&  package MyObject;
\&
\&  use Rose::Object::MakeMethods::DateTime
\&  (
\&    datetime => 
\&    [
\&      \*(Aqbirthday\*(Aq,
\&      \*(Aqarrival\*(Aq => { tz => \*(AqUTC\*(Aq }
\&    ],
\&  );
\&
\&  ...
\&
\&  $obj = MyObject\->new(birthday => \*(Aq1/24/1984 1am\*(Aq);
\&
\&  $dt = $obj\->birthday; # DateTime object
\&
\&  $bday = $obj\->birthday(format => \*(Aq%B %E\*(Aq); # \*(AqJanuary 24th\*(Aq
\&
\&  # Shortcut for $obj\->birthday\->clone\->truncate(to => \*(Aqmonth\*(Aq);
\&  $month = $obj\->birthday(truncate => \*(Aqmonth\*(Aq);
\&
\&  $obj\->birthday(\*(Aqblah\*(Aq);       # croaks \- invalid date!
\&  $obj\->birthday(\*(Aq1999\-04\-31\*(Aq); # croaks \- invalid date!
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
Rose::Object::MakeMethods::DateTime is a method maker that inherits
from Rose::Object::MakeMethods.  See the Rose::Object::MakeMethods
documentation to learn about the interface.  The method types provided
by this module are described below.  All methods work only with
hash-based objects.
.SH "METHODS TYPES"
.IX Header "METHODS TYPES"
.IP "\fBdatetime\fR" 4
.IX Item "datetime"
Create get/set methods for scalar attributes that store DateTime
objects.
.RS 4
.IP "Options" 4
.IX Item "Options"
.RS 4
.PD 0
.ie n .IP """hash_key""" 4
.el .IP "\f(CWhash_key\fR" 4
.IX Item "hash_key"
.PD
The key inside the hash-based object to use for the storage of this
attribute. Defaults to the name of the method.
.ie n .IP """init_method""" 4
.el .IP "\f(CWinit_method\fR" 4
.IX Item "init_method"
The name of the method to call when initializing the value of an
undefined attribute.  This option is only applicable when using the
\&\f(CW\*(C`get_set_init\*(C'\fR interface. Defaults to the method name with the prefix
\&\f(CW\*(C`init_\*(C'\fR added.
.Sp
This method should return a value that can be parsed by
Rose::DateTime::Util's the \fIparse_date()\fR
function. If the return value is a DateTime object, it will have its time
zone set (see the \f(CW\*(C`tz\*(C'\fR option below) using DateTime's
\&\fIset_time_zone()\fR method.
.ie n .IP """interface""" 4
.el .IP "\f(CWinterface\fR" 4
.IX Item "interface"
Chooses one of the two possible interfaces.  Defaults to \f(CW\*(C`get_set\*(C'\fR.
.ie n .IP """tz""" 4
.el .IP "\f(CWtz\fR" 4
.IX Item "tz"
The time zone of the DateTime object to be stored.  If present, this value
will be passed as the second argument to Rose::DateTime::Util's the
\&\fIparse_date()\fR function when creating
DateTime objects for storage. If absent, DateTime objects will use the
default time zone of the Rose::DateTime::Util class, which is set by
Rose::DateTime::Util's \fItime_zone()\fR class
method.  See the Rose::DateTime::Util documentation for more information.
.RE
.RS 4
.RE
.IP "Interfaces" 4
.IX Item "Interfaces"
.RS 4
.PD 0
.ie n .IP """get_set""" 4
.el .IP "\f(CWget_set\fR" 4
.IX Item "get_set"
.PD
Creates a get/set accessor method for an object attribute that stores a
DateTime object.
.Sp
When called with a single argument, the argument is passed through
Rose::DateTime::Util's \fIparse_date()\fR
function in order to create the DateTime object that is stored.  The
current value of the attribute is returned.  Passing a value that is not
understood by Rose::DateTime::Util's
\&\fIparse_date()\fR function causes a fatal error.
.Sp
When called with two arguments and the first argument is the string 'format',
then the second argument is taken as a format specifier which is passed to
Rose::DateTime::Util's \fIformat_date()\fR
function.  The formatted string is returned.  In other words, this:
.Sp
.Vb 1
\&    $obj\->birthday(format => \*(Aq%m/%d/%Y\*(Aq);
.Ve
.Sp
Is just a shortcut for this:
.Sp
.Vb 2
\&    Rose::DateTime::Util::format_date($obj\->birthday, 
\&                                      \*(Aq%m/%d/%Y\*(Aq);
.Ve
.Sp
When called with two arguments and the first argument is the string
\&'truncate', then the second argument is taken as a truncation specifier which
is passed to DateTime's \fItruncate()\fR method called on a
clone of the existing DateTime object.  The cloned, truncated DateTime
object is returned.  In other words, this:
.Sp
.Vb 1
\&    $obj\->birthday(truncate => \*(Aqmonth\*(Aq);
.Ve
.Sp
Is just a shortcut for this:
.Sp
.Vb 1
\&    $obj\->birthday\->clone\->truncate(to => \*(Aqmonth\*(Aq);
.Ve
.Sp
Passing more than two arguments or passing two arguments where the
first argument is not 'format' or 'truncate' will cause a fatal error.
.ie n .IP """get_set_init""" 4
.el .IP "\f(CWget_set_init\fR" 4
.IX Item "get_set_init"
Behaves like the \f(CW\*(C`get_set\*(C'\fR interface unless the value of the attribute is
undefined.  In that case, the method specified by the \f(CW\*(C`init_method\*(C'\fR option is
called, the return value is passed through Rose::DateTime::Util's
\&\fIparse_date()\fR function, and the attribute is
set to the return value.  An init method that returns a value that is not
understood by Rose::DateTime::Util's
\&\fIparse_date()\fR function will cause a fatal
error.
.RE
.RS 4
.RE
.RE
.RS 4
.Sp
Example:
.Sp
.Vb 1
\&    package MyObject;
\&
\&    use Rose::Object::MakeMethods::DateTime
\&    (
\&      datetime => 
\&      [
\&        \*(Aqbirthday\*(Aq,
\&        \*(Aqarrival\*(Aq => { tz => \*(AqUTC\*(Aq }
\&      ],
\&
\&      \*(Aqdatetime \-\-get_set_init\*(Aq =>
\&      [
\&        \*(Aqdeparture\*(Aq => { tz => \*(AqUTC\*(Aq }
\&      ],
\&    );
\&
\&    sub init_departure 
\&    {
\&      DateTime\->new(month => 1, 
\&                    day   => 10,
\&                    year  => 2000,
\&                    time_zone => \*(AqAmerica/Chicago\*(Aq);
\&    }
\&
\&    ...
\&
\&    $obj = MyObject\->new(birthday => \*(Aq1/24/1984 1am\*(Aq);
\&
\&    $dt = $obj\->birthday; # DateTime object
\&
\&    $bday = $obj\->birthday(format => \*(Aq%B %E\*(Aq); # \*(AqJanuary 24th\*(Aq
\&
\&    # Shortcut for $obj\->birthday\->clone\->truncate(to => \*(Aqmonth\*(Aq);
\&    $month = $obj\->birthday(truncate => \*(Aqmonth\*(Aq);
\&
\&    $obj\->birthday(\*(Aqblah\*(Aq);       # croaks \- invalid date!
\&    $obj\->birthday(\*(Aq1999\-04\-31\*(Aq); # croaks \- invalid date!
\&
\&    # DateTime object with time zone set to UTC
\&    $dt = $obj\->arrival(\*(Aq2005\-21\-01 4pm\*(Aq);
\&
\&    # DateTime object with time zone set to UTC, not America/Chicago!
\&    #   Start with 2000\-01\-10T00:00:00 America/Chicago,
\&    #   then set_time_zone(\*(AqUTC\*(Aq), 
\&    #   which results in: 2000\-01\-10T06:00:00 UTC
\&    $dt = $obj\->departure;
\&
\&    print $dt; # "2000\-01\-10T06:00:00"
.Ve
.RE
.SH "AUTHOR"
.IX Header "AUTHOR"
John C. Siracusa (siracusa@gmail.com)
.SH "LICENSE"
.IX Header "LICENSE"
Copyright (c) 2010 by John C. Siracusa.  All rights reserved.  This program is
free software; you can redistribute it and/or modify it under the same terms
as Perl itself.