Xenograft.java example

Explorer
mage-master
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package mage.cards.x;

import java.util.List;
import java.util.UUID;
import mage.abilities.Ability;
import mage.abilities.common.AsEntersBattlefieldAbility;
import mage.abilities.common.SimpleStaticAbility;
import mage.abilities.effects.ContinuousEffectImpl;
import mage.abilities.effects.common.ChooseCreatureTypeEffect;
import mage.cards.CardImpl;
import mage.cards.CardSetInfo;
import mage.constants.CardType;
import mage.constants.Duration;
import mage.constants.Layer;
import mage.constants.Outcome;
import mage.constants.SubLayer;
import mage.constants.Zone;
import mage.filter.common.FilterCreaturePermanent;
import mage.game.Game;
import mage.game.permanent.Permanent;

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

    public Xenograft(UUID ownerId, CardSetInfo setInfo) {
        super(ownerId,setInfo,new CardType[]{CardType.ENCHANTMENT},"{4}{U}");

        // As Xenograft enters the battlefield, choose a creature type.
        this.addAbility(new AsEntersBattlefieldAbility(new ChooseCreatureTypeEffect(Outcome.Detriment)));
        // Each creature you control is the chosen type in addition to its other types.
        this.addAbility(new SimpleStaticAbility(Zone.BATTLEFIELD, new XenograftAddSubtypeEffect()));
    }

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

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

class XenograftAddSubtypeEffect extends ContinuousEffectImpl {

    public XenograftAddSubtypeEffect() {
        super(Duration.WhileOnBattlefield, Layer.TypeChangingEffects_4, SubLayer.NA, Outcome.Benefit);
        staticText = "Each creature you control is the chosen type in addition to its other types";
    }

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

    @Override
    public boolean apply(Game game, Ability source) {
        String subtype = (String) game.getState().getValue(source.getSourceId() + "_type");
        if (subtype != null) {
            List<Permanent> permanents = game.getBattlefield().getAllActivePermanents(new FilterCreaturePermanent(), source.getControllerId(), game);
            for (Permanent permanent : permanents) {
                if (permanent != null && !permanent.getSubtype(game).contains(subtype)) {
                    permanent.getSubtype(game).add(subtype);
                }
            }
            return true;
        }
        return false;
    }

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