ColdsteelHeart.java example

Explorer
mage-master
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package mage.cards.c;

import mage.Mana;
import mage.ObjectColor;
import mage.abilities.Ability;
import mage.abilities.common.EntersBattlefieldAbility;
import mage.abilities.common.EntersBattlefieldTappedAbility;
import mage.abilities.costs.common.TapSourceCost;
import mage.abilities.effects.common.ChooseColorEffect;
import mage.abilities.effects.common.ManaEffect;
import mage.abilities.mana.SimpleManaAbility;
import mage.cards.CardImpl;
import mage.cards.CardSetInfo;
import mage.constants.*;
import mage.game.Game;
import mage.players.Player;

import java.util.UUID;

/**
 *
 * @author Plopman
 */
public class ColdsteelHeart extends CardImpl {

    public ColdsteelHeart(UUID ownerId, CardSetInfo setInfo) {
        super(ownerId,setInfo,new CardType[]{CardType.ARTIFACT},"{2}");
        this.addSuperType(SuperType.SNOW);

        // Coldsteel Heart enters the battlefield tapped.
        this.addAbility(new EntersBattlefieldTappedAbility());
        // As Coldsteel Heart enters the battlefield, choose a color.
        this.addAbility(new EntersBattlefieldAbility(new ChooseColorEffect(Outcome.Neutral), null, "As {this} enters the battlefield, choose a color.", null));
        // {T}: Add one mana of the chosen color to your mana pool.
        this.addAbility(new SimpleManaAbility(Zone.BATTLEFIELD, new ColdsteelHeartManaEffect(), new TapSourceCost()));
    }

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

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

class ColdsteelHeartManaEffect extends ManaEffect {

    public ColdsteelHeartManaEffect() {
        super();
        staticText = "Add one mana of the chosen color to your mana pool";
    }

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

    @Override
    public boolean apply(Game game, Ability source) {
        Player player = game.getPlayer(source.getControllerId());
        if (player != null) {
            player.getManaPool().addMana(getMana(game, source), game, source);
        }
        return true;
    }

    @Override
    public Mana getMana(Game game, Ability source) {
        ObjectColor color = (ObjectColor) game.getState().getValue(source.getSourceId() + "_color");
        if (color != null) {
            return new Mana(ColoredManaSymbol.lookup(color.toString().charAt(0)));
        } else {
            return null;
        }
    }

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