+#
+# Investigate whether an external node is accessible
+#
+# If it is, make it believable otherwise mark as not
+# to be believed.
+#
+# It is possible to store up state for a node to be
+# investigated, so that if it is accessible, its details
+# will be passed on to whomsoever might be interested.
+#
+# Copyright (c) 2004 Dirk Koopman, G1TLH
+#
+# $Id$
+#
+
+use strict;
+
+package Investigate;
+
+use DXDebug;
+use DXUtil;
+
+
+use vars qw($VERSION $BRANCH);
+$VERSION = sprintf( "%d.%03d", q$Revision$ =~ /(\d+)\.(\d+)/ );
+$BRANCH = sprintf( "%d.%03d", q$Revision$ =~ /\d+\.\d+\.(\d+)\.(\d+)/ || (0,0));
+$main::build += $VERSION;
+$main::branch += $BRANCH;
+
+use vars qw (%list %valid);
+
+%list = (); # the list of outstanding investigations
+%valid = ( # valid fields
+ call => '0,Callsign',
+ start => '0,Started at,atime',
+ version => '0,Node Version',
+ build => '0,Node Build',
+ here => '0,Here?,yesno',
+ conf => '0,In Conf?,yesno',
+ );
+
+
+sub new
+{
+ my $pkg = shift;
+ my $call = shift;
+ my $self = $list{$call} || bless { call=>$call, start=>$main::systime }, ref($pkg) || $pkg;
+ return $self;
+}
+
+sub get
+{
+ return $list{$_[0]};
+}
+
+sub AUTOLOAD
+{
+ no strict;
+ my $name = $AUTOLOAD;
+ return if $name =~ /::DESTROY$/;
+ $name =~ s/^.*:://o;
+
+ confess "Non-existant field '$AUTOLOAD'" if !$valid{$name};
+
+ # this clever line of code creates a subroutine which takes over from autoload
+ # from OO Perl - Conway
+ *$AUTOLOAD = sub {@_ > 1 ? $_[0]->{$name} = $_[1] : $_[0]->{$name}};
+ goto &$AUTOLOAD;
+}
+1;