MooseX::AttributeHelpers::MethodProvider::List(3p)

NAME
MooseX::AttributeHelpers::MethodProvider::List

SYNOPSIS
   package Stuff;
   use Moose;
   use MooseX::AttributeHelpers;

   has 'options' => (
       metaclass  => 'Collection::List',
       is         => 'rw',
       isa        => 'ArrayRef[Str]',
       default    => sub { [] },
       auto_deref => 1,
       provides   => {
           elements => 'all_options',
           map      => 'map_options',
           grep     => 'filter_options',
           find     => 'find_option',
           first    => 'first_option',
           last     => 'last_option',
           get      => 'get_option',
           join     => 'join_options',
           count    => 'count_options',
           empty    => 'do_i_have_options',
           sort     => 'sorted_options',
       }
   );

   no Moose;
   1;

DESCRIPTION
This is a role which provides the method generators for MooseX::AttributeHelpers::Collection::List.

METHODS

meta

PROVIDED METHODS
count
    Returns the number of elements in the list.

       $stuff = Stuff->new;
       $stuff->options(["foo", "bar", "baz", "boo"]);

       my $count = $stuff->count_options;
       print "$count\n"; # prints 4

empty
    If the list is populated, returns true. Otherwise, returns false.

       $stuff->do_i_have_options ? print "Good boy.\n" : die "No options!\n" ;

find
    This method accepts a subroutine reference as its argument. That sub will receive each element of the list in turn. If it returns true for an element, that element will be returned by the "find" method.

       my $found = $stuff->find_option( sub { $_[0] =~ /^b/ } );
       print "$found\n"; # prints "bar"

grep
    This method accepts a subroutine reference as its argument. This method returns every element for which that subroutine reference returns a true value.

       my @found = $stuff->filter_options( sub { $_[0] =~ /^b/ } );
       print "@found\n"; # prints "bar baz boo"

map This method accepts a subroutine reference as its argument. The subroutine will be executed for each element of the list. It is expected to return a modified version of that element. The return value of the method is a list of the modified options.

       my @mod_options = $stuff->map_options( sub { $_[0] . "-tag" } );
       print "@mod_options\n"; # prints "foo-tag bar-tag baz-tag boo-tag"

sort
    Sorts and returns the elements of the list.

    You can provide an optional subroutine reference to sort with (as you can with the core "sort" function). However, instead of using $a and $b, you will need to use $_[0] and $_[1] instead.

       # ascending ASCIIbetical
       my @sorted = $stuff->sort_options();

       # Descending alphabetical order
       my @sorted_options = $stuff->sort_options( sub { lc $_[1] cmp lc $_[0] } );
       print "@sorted_options\n"; # prints "foo boo baz bar"

elements
    Returns all of the elements of the list

       my @option = $stuff->all_options;
       print "@options\n"; # prints "foo bar baz boo"

join
    Joins every element of the list using the separator given as argument.

       my $joined = $stuff->join_options( ':' );
       print "$joined\n"; # prints "foo:bar:baz:boo"

get Returns an element of the list by its index.

       my $option = $stuff->get_option(1);
       print "$option\n"; # prints "bar"

first
    Returns the first element of the list.

       my $first = $stuff->first_option;
       print "$first\n"; # prints "foo"

last
    Returns the last element of the list.

       my $last = $stuff->last_option;
       print "$last\n"; # prints "boo"

BUGS
All complex software has bugs lurking in it, and this module is no exception. If you find a bug please either email me, or add the bug to cpan-RT.

AUTHOR
Stevan Little <stevan@iinteractive.com>

COPYRIGHT AND LICENSE
Copyright 2007-2009 by Infinity Interactive, Inc.

<http://www.iinteractive.com>

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