NAME

Apache::Wyrd::Datum - Abstract data-checking objects for Wyrd Input objects

SYNOPSIS

    use Apache::Wyrd::Datum;
    my $ives = Apache::Wyrd::Datum::Set->new(
      'kits',
      {
        options => ['kits', 'cats', 'sacks', 'wives'],
        not_null => 0
      }
    );
    my ($are_ostriches_ok, $why_not) = $ives->check('ostriches')
    my $is_cats = $ives->set('cats');
    if ($is_cats) {
      print "yes, it can be cats"
    } else {
      print "no, cats are out"
    }
    my $suggest_something_then = $ives->suggest;

OBJECTS

This module defines the following objects:

Apache::Wyrd::Datum

Apache::Wyrd::Datum::Char

Apache::Wyrd::Datum::Varchar

Apache::Wyrd::Datum::Text

Apache::Wyrd::Datum::Set

Apache::Wyrd::Datum::Enum

DESCRIPTION

These objects are roughly tied to SQL data types and HTML inputs for providing data objects to higher-level objects. By abstracting the data class, the definintion of a "valid" value can be abstracted from the SQL or Wyrd device it will be used to check the values of.

These are used by Apache::Wyrd::Input-derived classes to check user-input.

METHODS

All Classes have the following methods:

new

    my $data = Apache::Wyrd::Datum->new($value, \%params);

set

    $data->set('value') #sets data to value (if strict, will return undef and fail to set)

get

    my $value = $data->get('value'); #Return value (always a scalar)

check

    $data->check('somevalue') #returns undef on invalid data.
                              #Second returned param is an
                              #[optional] error message.

type

    $data->type #returns Data type: Char, Varchar, etc. in lower case

suggest

    $data->suggest #returns a suggested value [if implemented].

DEVELOPMENT

Derived classes of Apache::Wyrd::Datum should override:

• _type

• _check_params

• _check_value

And will probably want to override:

• _default_value

• _raise_exception

PARAMS

All Datum objects are initialized with

Char

params: strict, length, not-null

Varchar

params: strict, length, not-null

Text

params: strict, not-null

Blob

params: strict, not-null

Set

params: strict, not-null, options (arrayref of possible options)

Enum

params: strict, not-null, options (arrayref of possible options)

AUTHOR

Barry King <wyrd@nospam.wyrdwright.com>

LICENSE

Copyright 2002-2007 Wyrdwright, Inc. and licensed under the GNU GPL.

See LICENSE under the documentation for Apache::Wyrd.