ChainedThroatseeker.java example

Explorer
mage-master
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package mage.cards.c;

import mage.MageInt;
import mage.abilities.Ability;
import mage.abilities.common.SimpleStaticAbility;
import mage.abilities.effects.RestrictionEffect;
import mage.abilities.keyword.InfectAbility;
import mage.cards.CardImpl;
import mage.cards.CardSetInfo;
import mage.constants.CardType;
import mage.constants.Duration;
import mage.constants.Zone;
import mage.counters.CounterType;
import mage.game.Game;
import mage.game.permanent.Permanent;
import mage.players.Player;

import java.util.UUID;

/**
 *
 * @author North
 */
public class ChainedThroatseeker extends CardImpl {

    public ChainedThroatseeker(UUID ownerId, CardSetInfo setInfo) {
        super(ownerId,setInfo,new CardType[]{CardType.CREATURE},"{5}{U}");
        this.subtype.add("Horror");

        this.power = new MageInt(5);
        this.toughness = new MageInt(5);

        // Infect (This creature deals damage to creatures in the form of -1/-1 counters and to players in the form of poison counters.)
        this.addAbility(InfectAbility.getInstance());

        // Chained Throatseeker can't attack unless defending player is poisoned.
        this.addAbility(new SimpleStaticAbility(Zone.BATTLEFIELD, new ChainedThroatseekerCantAttackEffect()));
    }

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

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

class ChainedThroatseekerCantAttackEffect extends RestrictionEffect {

    public ChainedThroatseekerCantAttackEffect() {
        super(Duration.WhileOnBattlefield);
        staticText = "{this} can't attack unless defending player is poisoned";
    }

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

    @Override
    public boolean applies(Permanent permanent, Ability source, Game game) {
        return permanent.getId().equals(source.getSourceId());
    }

    @Override
    public boolean canAttack(Permanent attacker, UUID defenderId, Ability source, Game game) {
        Player targetPlayer = game.getPlayer(defenderId);
        if (targetPlayer != null) {
            if (targetPlayer.getCounters().containsKey(CounterType.POISON)) {
                return true;
            }
        }
        return false;
    }

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

}