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    <p>Opening files doesn't really relate to Moose in any way. However, if you are looking for existing interfaces to deal with files, you should take a look at <a href="http://search.cpan.org/perldoc?Path%3a%3aClass%3a%3aFile" rel="nofollow">Path::Class::File</a>, which is an object that will contain a filename and provide you many methods for dealing with the file it represents. It is quite common to use this class as a Moose type constraint in an attribute:</p> <pre><code>package MyApp::Foo; use Moose; has filename =&gt; ( is =&gt; 'ro', isa =&gt; 'Path::Class::File', ); sub process_file { my $this = shift; if (-e $this-&gt;filename) { my $fh = $this-&gt;filename-&gt;openr; while (my $line = &lt;$fh&gt;) { # process file, line by line... } } } package main; my $obj = MyApp::Foo-&gt;new(filename =&gt; '/home/me/foo.txt'); $obj-&gt;process_file; </code></pre> <p>You could also modify the <code>process_file</code> method so it takes a coderef which receives one line from the file as an argument, to process the file contents in a more modular way. It all depends on what you need your program to do, of course.</p> <p>Alternatively, if you like <a href="http://metacpan.org/module/MooseX%3a%3aTypes" rel="nofollow">MooseX::Types</a>, you can do:</p> <pre><code>use MooseX::Types::Path::Class qw(Dir File); has file =&gt; ( ..., isa =&gt; File, coerce =&gt; 1, ... ); </code></pre> <p>This will let you pass a filename to the attribute and it will automatically inflate into a <code>Path::Class::File</code> object internally.</p>
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