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#!/usr/bin/env perl -w
# SET UP A WINDOW HIERARCHY
package Window;
my $id = 1;
sub new { bless { id=>$id++ }, ref($_[0])||$_[0] }
# SET UP DISPATCH TABLE
my %handler;
sub generic_handler
{
print "Window $_[0]->{id} can't handle a ",
ref($_[1]), " command in ",
ref($_[2]), " mode\n";
}
sub OffMode_handler
{
print "No window operations available in OffMode\n";
}
sub ModalWindow_Accept_OffMode_handler
{
print "Modal window $_[0]->{id} can't accept in OffMode!\n";
}
sub ModalWindow_Accept_handler
{
print "Modal window $_[0]->{id} accepts!\n";
}
sub ModalWindow_Reshape_handler
{
print "Modal windows can't handle reshape commands\n";
}
sub MovableWindow_Move_OnMode_handler
{
print "Moving window $_[0]->{id}!\n";
}
sub ResizableWindow_MoveAndResize_OnMode_handler
{
print "Moving and resizing window $_[0]->{id}!\n";
}
sub ResizableWindow_Resize_OnMode_handler
{
print "Resizing window $_[0]->{id}!\n";
}
$handler{Window}{Command}{Mode} = \&generic_handler;
$handler{Window}{Command}{OnMode} = \&generic_handler;
$handler{Window}{Command}{OffMode} = \&OffMode_handler;
$handler{Window}{Command}{ModalMode} = \&generic_handler;
$handler{Window}{Reshape}{Mode} = \&generic_handler;
$handler{Window}{Reshape}{OnMode} = \&generic_handler;
$handler{Window}{Reshape}{OffMode} = \&OffMode_handler;
$handler{Window}{Reshape}{ModalMode} = \&generi_handler;
$handler{Window}{Accept}{Mode} = \&generic_handler;
$handler{Window}{Accept}{OnMode} = \&generic_handler;
$handler{Window}{Accept}{OffMode} = \&OffMode_handler;
$handler{Window}{Accept}{ModalMode} = \&generic_handler;
$handler{Window}{Move}{Mode} = \&generic_handler;
$handler{Window}{Move}{OnMode} = \&generic_handler;
$handler{Window}{Move}{OffMode} = \&OffMode_handler;
$handler{Window}{Move}{ModalMode} = \&generic_handler;
$handler{Window}{Resize}{Mode} = \&generic_handler;
$handler{Window}{Resize}{OnMode} = \&generic_handler;
$handler{Window}{Resize}{OffMode} = \&OffMode_handler;
$handler{Window}{Resize}{ModalMode} = \&generic_handler;
$handler{Window}{MoveAndResize}{Mode} = \&generic_handler;
$handler{Window}{MoveAndResize}{OnMode} = \&generic_handler;
$handler{Window}{MoveAndResize}{OffMode} = \&OffMode_handler;
$handler{Window}{MoveAndResize}{ModalMode} = \&generic_handler;
$handler{ModalWindow}{Command}{Mode} = \&generic_handler;
$handler{ModalWindow}{Command}{OnMode} = \&generic_handler;
$handler{ModalWindow}{Command}{OffMode} = \&OffMode_handler;
$handler{ModalWindow}{Command}{ModalMode} = \&generic_handler;
$handler{ModalWindow}{Reshape}{Mode} = \&ModalWindow_Reshape_handler;
$handler{ModalWindow}{Reshape}{Mode} = \&ModalWindow_Reshape_handler;
$handler{ModalWindow}{Reshape}{OnMode} = \&ModalWindow_Reshape_handler;
$handler{ModalWindow}{Reshape}{OffMode} = \&ModalWindow_Reshape_handler;
$handler{ModalWindow}{Accept}{Mode} = \&ModalWindow_Accept_handler;
$handler{ModalWindow}{Accept}{OnMode} = \&ModalWindow_Accept_handler;
$handler{ModalWindow}{Accept}{OffMode} = \&ModalWindow_Accept_OffMode_handler;
$handler{ModalWindow}{Accept}{ModalMode} = \&ModalWindow_Accept_handler;
$handler{ModalWindow}{Move}{Mode} = \&ModalWindow_Reshape_handler;
$handler{ModalWindow}{Move}{OnMode} = \&ModalWindow_Reshape_handler;
$handler{ModalWindow}{Move}{OffMode} = \&ModalWindow_Reshape_handler;
$handler{ModalWindow}{Move}{ModalMode} = \&ModalWindow_Reshape_handler;
$handler{ModalWindow}{Resize}{Mode} = \&ModalWindow_Reshape_handler;
$handler{ModalWindow}{Resize}{OnMode} = \&ModalWindow_Reshape_handler;
$handler{ModalWindow}{Resize}{OffMode} = \&ModalWindow_Reshape_handler;
$handler{ModalWindow}{Resize}{ModalMode} = \&ModalWindow_Reshape_handler;
$handler{ModalWindow}{MoveAndResize}{Mode} = \&ModalWindow_Reshape_handler;
$handler{ModalWindow}{MoveAndResize}{OnMode} = \&ModalWindow_Reshape_handler;
$handler{ModalWindow}{MoveAndResize}{OffMode} = \&ModalWindow_Reshape_handler;
$handler{ModalWindow}{MoveAndResize}{ModalMode} = \&ModalWindow_Reshape_handler;
$handler{MovableWindow}{Command}{Mode} = \&generic_handler;
$handler{MovableWindow}{Command}{OnMode} = \&generic_handler;
$handler{MovableWindow}{Command}{OffMode} = \&OffMode_handler;
$handler{MovableWindow}{Command}{ModalMode} = \&generic_handler;
$handler{MovableWindow}{Reshape}{Mode} = \&generic_handler;
$handler{MovableWindow}{Reshape}{OnMode} = \&generic_handler;
$handler{MovableWindow}{Reshape}{OffMode} = \&OffMode_handler;
$handler{MovableWindow}{Reshape}{ModalMode} = \&generic_handler;
$handler{MovableWindow}{Accept}{Mode} = \&generic_handler;
$handler{MovableWindow}{Accept}{OnMode} = \&generic_handler;
$handler{MovableWindow}{Accept}{OffMode} = \&OffMode_handler;
$handler{MovableWindow}{Accept}{ModalMode} = \&generic_handler;
$handler{MovableWindow}{Move}{Mode} = \&generic_handler;
$handler{MovableWindow}{Move}{OnMode} = \&MovableWindow_Move_OnMode_handler;
$handler{MovableWindow}{Move}{OffMode} = \&OffMode_handler;
$handler{MovableWindow}{Move}{ModalMode} = \&generic_handler;
$handler{MovableWindow}{Resize}{Mode} = \&generic_handler;
$handler{MovableWindow}{Resize}{OnMode} = \&generic_handler;
$handler{MovableWindow}{Resize}{OffMode} = \&OffMode_handler;
$handler{MovableWindow}{Resize}{ModalMode} = \&generic_handler;
$handler{MovableWindow}{MoveAndResize}{Mode} = \&generic_handler;;
$handler{MovableWindow}{MoveAndResize}{OnMode} = \&MovableWindow_Move_OnMode_handler;
$handler{MovableWindow}{MoveAndResize}{OffMode} = \&OffMode_handler;
$handler{MovableWindow}{MoveAndResize}{ModalMode} = \&generic_handler;
$handler{ResizableWindow}{Command}{Mode} = \&generic_handler;
$handler{ResizableWindow}{Command}{OnMode} = \&generic_handler;
$handler{ResizableWindow}{Command}{OffMode} = \&OffMode_handler;
$handler{ResizableWindow}{Command}{ModalMode} = \&generic_handler;
$handler{ResizableWindow}{Reshape}{Mode} = \&generic_handler;
$handler{ResizableWindow}{Reshape}{OnMode} = \&generic_handler;
$handler{ResizableWindow}{Reshape}{OffMode} = \&OffMode_handler;
$handler{ResizableWindow}{Reshape}{ModalMode} = \&generic_handler;
$handler{ResizableWindow}{Accept}{Mode} = \&generic_handler;
$handler{ResizableWindow}{Accept}{OnMode} = \&generic_handler;
$handler{ResizableWindow}{Accept}{OffMode} = \&OffMode_handler;
$handler{ResizableWindow}{Accept}{ModalMode} = \&generic_handler;
$handler{ResizableWindow}{Move}{Mode} = \&generic_handler;
$handler{ResizableWindow}{Move}{OnMode} = \&MovableWindow_Move_OnMode_handler;
$handler{ResizableWindow}{Move}{OffMode} = \&OffMode_handler;
$handler{ResizableWindow}{Move}{ModalMode} = \&generic_handler;
$handler{ResizableWindow}{Resize}{Mode} = \&generic_handler;
$handler{ResizableWindow}{Resize}{OnMode} = \&ResizableWindow_Resize_OnMode_handler;
$handler{ResizableWindow}{Resize}{OffMode} = \&OffMode_handler;
$handler{ResizableWindow}{Resize}{ModalMode} = \&generic_handler;
$handler{ResizableWindow}{MoveAndResize}{Mode} = \&generic_handler;
$handler{ResizableWindow}{MoveAndResize}{OnMode} = \&ResizableWindow_MoveAndResize_OnMode_handler;
$handler{ResizableWindow}{MoveAndResize}{OffMode} = \&OffMode_handler;
$handler{ResizableWindow}{MoveAndResize}{ModalMode} = \&generic_handler;
sub handle
{
$handler{ref $_[0]}{ref $_[1]}{ref $_[2]}->(@_);
}
package ModalWindow; @ISA = qw( Window );
package MovableWindow; @ISA = qw( Window );
package ResizableWindow; @ISA = qw( MovableWindow );
# SET UP A COMMAND HIERARCHY
package Command;
sub new { bless {}, ref($_[0])||$_[0] }
package ReshapeCommand; @ISA = qw( Command );
package Accept; @ISA = qw( Command );
package Move; @ISA = qw( ReshapeCommand );
package Resize; @ISA = qw( ReshapeCommand );
package MoveAndResize; @ISA = qw( Move Resize );
# SET UP A MODE HIERARCHY
package Mode;
sub new { bless {}, ref($_[0])||$_[0] }
package OnMode; @ISA = qw( Mode );
package ModalMode; @ISA = qw( Mode );
package OffMode; @ISA = qw( Mode );
package main;
# CREATE SOME WINDOWS...
@window = (
new ModalWindow,
new MovableWindow,
new ResizableWindow,
);
# ...AND SOME COMMANDS...
@command = (
new Move,
new Resize,
new MoveAndResize,
new Accept,
);
# ...AND SOME MODES...
@mode = (
new OffMode,
new ModalMode,
new OnMode,
new OnMode,
new OnMode,
);
# AND INTERACT THEM ALL...
srand(0);
for (1..10000)
{
$w = $window[rand @window];
$c = $command[rand @command];
$m = $mode[rand @mode];
print "handle(",ref($w),",",ref($c),",",ref($m),")...\n\t";
eval { $w->handle($c,$m) } or print $@;
}
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