GamorreanPrisonGuard.java example

Explorer
mage-master
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package mage.cards.g;

import mage.MageInt;
import mage.abilities.Ability;
import mage.abilities.common.EntersBattlefieldAllTriggeredAbility;
import mage.abilities.effects.OneShotEffect;
import mage.cards.CardImpl;
import mage.cards.CardSetInfo;
import mage.constants.*;
import mage.filter.FilterPermanent;
import mage.filter.common.FilterCreaturePermanent;
import mage.filter.predicate.permanent.ControllerPredicate;
import mage.game.Game;
import mage.game.permanent.Permanent;
import mage.players.Player;

import java.util.UUID;

/**
 *
 * @author Styxo
 */
public class GamorreanPrisonGuard extends CardImpl {

    private static final FilterPermanent filter = new FilterCreaturePermanent("a creature");

    static {
        filter.add(new ControllerPredicate(TargetController.OPPONENT));
    }

    public GamorreanPrisonGuard(UUID ownerId, CardSetInfo setInfo) {
        super(ownerId,setInfo,new CardType[]{CardType.CREATURE},"{R}");
        this.subtype.add("Gamorrean");
        this.subtype.add("Warrior");
        this.power = new MageInt(2);
        this.toughness = new MageInt(1);

        // Whenever a creature enters the battlefield under an opponent's control, Gamorrean Prison Guard fights that creature.
        this.addAbility(new EntersBattlefieldAllTriggeredAbility(
                Zone.BATTLEFIELD, new GamorreanPrisonGuardEffect(), filter, false, SetTargetPointer.PERMANENT, "Whenever a creature enters the battlefield under an opponent's control, Gamorrean Prison Guard fights that creature."));

    }

    public GamorreanPrisonGuard(final GamorreanPrisonGuard card) {
        super(card);
    }

    @Override
    public GamorreanPrisonGuard copy() {
        return new GamorreanPrisonGuard(this);
    }
}

class GamorreanPrisonGuardEffect extends OneShotEffect {

    public GamorreanPrisonGuardEffect() {
        super(Outcome.Detriment);
    }

    public GamorreanPrisonGuardEffect(final GamorreanPrisonGuardEffect effect) {
        super(effect);
    }

    @Override
    public boolean apply(Game game, Ability source) {
        Player you = game.getPlayer(source.getControllerId());
        Permanent thisCreature = game.getPermanent(source.getSourceId());
        Permanent opponentCreature = game.getPermanent(getTargetPointer().getFirst(game, source));
        if (you != null && thisCreature != null && opponentCreature != null) {
            return thisCreature.fight(opponentCreature, source, game);
        }
        return false;
    }

    @Override
    public GamorreanPrisonGuardEffect copy() {
        return new GamorreanPrisonGuardEffect(this);
    }
}