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copied!<p>I'm not absolutely completely sure that I understand exactly what you're saying, but as an analagous situation, say someone's inputting an endless stream of numbers on the keyboard. '117' is a magic sequence, '468' is another one, '411799' is another (which contains the first one). </p> <p>So if the user enters:</p> <blockquote> <p>55468411799</p> </blockquote> <p>you want to fire 'magic events' at the *s:</p> <blockquote> <p>55468*4117*99*</p> </blockquote> <p>or something like that, right? If that's analagous to the problem you're talking about, then what about something like (Java-like pseudocode):</p> <pre><code>MagicSequence fireworks = new MagicSequence(new FireworksAction(), 1, 1, 7); MagicSequence playMusic = new MagicSequence(new MusicAction(), 4, 6, 8); MagicSequence fixUserADrink = new MagicSequence(new ManhattanAction(), 4, 1, 1, 7, 9, 9); Collection<MagicSequence> sequences = ... all of the above ...; while (true) { int num = readNumberFromUser(); for (MagicSequence seq : sequences) { seq.handleNumber(num); } } </code></pre> <p>while MagicSequence has something like:</p> <pre><code>Action action = ... populated from constructor ...; int[] sequence = ... populated from constructor ...; int position = 0; public void handleNumber(int num) { if (num == sequence[position]) { // They've entered the next number in the sequence position++; if (position == sequence.length) { // They've got it all! action.fire(); position = 0; // Or disable this Sequence from accepting more numbers if it's a once-off } } else { position = 0; // missed a number, start again! } } </code></pre>

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