NAME URI::ToDisk - An object for mapping a URI to an on-disk storage directory SYNOPSIS # We have a directory on disk that is accessible via a web server my $authors = URI::ToDisk->new( '/var/www/AUTHORS', 'http://ali.as/AUTHORS' ); # We know where a particular generated file needs to go my $about = $authors->catfile( 'A', 'AD', 'ADAMK', 'about.html' ); # Save the file to disk my $file = $about->path; open( FILE, ">$file" ) or die "open: $!"; print FILE, $content; close FILE; # Show the user where to see the file my $uri = $about->uri; print "Author information is at $uri\n"; DESCRIPTION In several process relating to working with the web, we may need to keep track of an area of disk that maps to a particular URL. From this location, we should be able to derived both a filesystem path and URL for any given directory or file under this location that we might need to work with. Implementation Internally each "URI::ToDisk" object contains both a filesystem path, which is altered using File::Spec, and a URI object. When making a change, the path section of the URI is altered using . Method Calling Conventions The main functional methods, such as "catdir" and "catfile", do not modify the original object, instead returning a new object containing the new location. This means that it should be used in a somewhat similar way to File::Spec. # The File::Spec way my $path = '/some/path'; $path = File::Spec->catfile( $path, 'some', 'file.txt' ); # The URI::ToDisk way my $location = URI::ToDisk->new( '/some/path', 'http://foo.com/blah' ); $location = $location->catfile( 'some', 'file.txt' ); OK, well it's not exactly THAT close, but you get the idea. It also allows you to do method chaining, which is basically URI::ToDisk->new( '/foo', 'http://foo.com/' )->catfile( 'bar.txt' )->uri Which may seem a little trivial now, but I expect it to get more useful later. It also means you can do things like this. my $base = URI::ToDisk->new( '/my/cache', 'http://foo.com/' ); foreach my $path ( @some_files ) { my $file = $base->catfile( $path ); print $file->path . ': ' . $file->uri . "\n"; } In the above example, you don't have to be continuously cloning the location, because all that stuff happens internally as needed. METHODS new $path, $http_url The "new" constructor takes as argument a filesystem path and a http(s) URL. Both are required, and the method will return "undef" is either is illegal. The URL is not required to have protocol, host or port sections, and as such allows for host-relative URL to be used. Returns a new "URI::ToDisk" object on success, or "undef" on failure. param $various "param" is provided as a mechanism for higher order modules to flexibly accept URI::ToDisk's as parameters. In this case, it accepts either an existing URI::ToDisk object, two arguments ($path, $http_url), or a reference to an array containing the same two arguments. Returns a URI::ToDisk if possible, or "undef" if one cannot be provided. uri The "uri" method gets and returns the current URI of the location, in string form. URI The capitalised "URI" method gets and returns a copy of the raw URI, held internally by the location. Note that only a copy is returned, and as such as safe to further modify yourself without effecting the location. path The "path" method returns the filesystem path componant of the location. catdir 'dir', 'dir', ... A File::Spec workalike, the "catdir" method acts in the same way as for File::Spec, modifying both componants of the location. The "catdir" method returns a new URI::ToDisk object representing the new location, or "undef" on error. catfile [ 'dir', ..., ] $file Like "catdir", the "catfile" method acts in the same was as for File::Spec, and returns a new URI::ToDisk object representing the file, or "undef" on error. TO DO Add more File::Spec-y methods as needed. Ask if you need one. SUPPORT Bugs should be reported via the CPAN bug tracker at For other issues, or commercial enhancement or support, contact the author. AUTHORS Adam Kennedy , cpan@ali.as COPYRIGHT Copyright (c) 2003 - 2006 Adam Kennedy. This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself. The full text of the license can be found in the LICENSE file included with this module.