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A modified version of the GGP-Base library for Alloy.

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package org.ggp.base.player.request.grammar;

import org.ggp.base.player.gamer.Gamer;
import org.ggp.base.player.gamer.exception.GamePreviewException;
import org.ggp.base.util.game.Game;
import org.ggp.base.util.logging.GamerLogger;

public final class PreviewRequest extends Request
{
    private final Game game;
    private final Gamer gamer;
    private final int previewClock;

    public PreviewRequest(Gamer gamer, Game theGame, int previewClock)
    {
        this.gamer = gamer;
        this.game = theGame;
        this.previewClock = previewClock;
    }

    @Override
    public String getMatchId() {
        return null;
    }

    @Override
    public String process(long receptionTime)
    {
        // Ensure that we aren't already playing a match. If we are,
        // ignore the message, saying that we're busy.
        if (gamer.getMatch() != null) {
            GamerLogger.logError("GamePlayer", "Got preview message while already busy playing a game: ignoring.");
            //gamer.notifyObservers(new GamerUnrecognizedMatchEvent(matchId));
            return "busy";
        }

        // Otherwise, if we're not busy, have the gamer start previewing.
        try {
            //gamer.notifyObservers(new PlayerTimeEvent(gamer.getMatch().getStartClock() * 1000));
            gamer.preview(game, previewClock * 1000 + receptionTime);
            //gamer.metaGame(gamer.getMatch().getStartClock() * 1000 + receptionTime);
        } catch (GamePreviewException e) {
            GamerLogger.logStackTrace("GamePlayer", e);

            // Upon encountering an uncaught exception during previewing,
            // assume that indicates that we aren't actually able to play
            // right now, and tell the server that we're busy.
            return "busy";
        }

        return "ready";
    }

    @Override
    public String toString()
    {
        return "start";
    }
}