package CGI::Switch;use Carp;use strict;use vars qw($VERSION @Pref);$VERSION = '0.05';@Pref = qw(CGI::Apache CGI); #defaultsub import {    my($self,@arg) = @_;    @Pref = @arg if @arg;}sub new {    shift;    my($file,$pack);    for $pack (@Pref) {	($file = $pack) =~ s|::|/|g;	eval { require "$file.pm"; };	if ($@) {#XXX	    warn $@;	    next;	} else {#XXX	    warn "Going to try $pack\->new\n";	    my $obj;	    eval {$obj = $pack->new(@_)};	    if ($@) {#XXX		warn $@;	    } else {		return $obj;	    }	}    }    Carp::croak "Couldn't load+construct any of @Pref\n";}# there's a trick in Lincoln's package that determines the calling# package.  The reason is to have a filehandle with the same name as# the filename.  To tell this trick that we are not the calling# package we have to follow this dirty convention. It's a questionable# trick imho, but for now I want to have something workingsub isaCGI { 1 }1;__END__=head1 NAMECGI::Switch - Try more than one constructors and return the first object available=head1 SYNOPSIS  use CGISwitch;  -or- use CGI::Switch This, That, CGI::XA, Foo, Bar, CGI; my $q = new CGI::Switch;=head1 DESCRIPTIONPer default the new() method tries to call new() in the three packagesApache::CGI, CGI::XA, and CGI. It returns the first CGI object itsucceeds with.The import method allows you to set up the default order of themodules to be tested.=head1 SEE ALSOperl(1), Apache(3), CGI(3), CGI::XA(3)=head1 AUTHORAndreas König E<lt>a.koenig@mind.deE<gt>=cut