mage/Mage/src/mage/target/common/TargetActivatedOrTriggeredAbility.java

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package mage.target.common;

import java.util.HashSet;
import java.util.Set;
import java.util.UUID;
import mage.constants.Zone;
import mage.abilities.Ability;
import mage.constants.AbilityType;
import mage.filter.Filter;
import mage.filter.FilterAbility;
import mage.game.Game;
import mage.game.stack.StackObject;
import mage.target.TargetObject;

/**
 *
 * @author LevelX2
 */


public class TargetActivatedOrTriggeredAbility extends TargetObject {

        public TargetActivatedOrTriggeredAbility() {
        this.minNumberOfTargets = 1;
        this.maxNumberOfTargets = 1;
        this.zone = Zone.STACK;
        this.targetName = "target activated or triggered ability";
    }

    public TargetActivatedOrTriggeredAbility(final TargetActivatedOrTriggeredAbility target) {
        super(target);
    }


    @Override
    public boolean canTarget(UUID id, Ability source, Game game) {
        // rule 114.4. A spell or ability on the stack is an illegal target for itself.
        if (source != null && source.getId().equals(id)) {
            return false;
        }

        StackObject stackObject = game.getStack().getStackObject(id);
        return isActivatedOrTriggeredAbility(stackObject);
    }

    @Override
    public boolean canChoose(UUID sourceId, UUID sourceControllerId, Game game) {
        return canChoose(sourceControllerId, game);
    }

    @Override
    public boolean canChoose(UUID sourceControllerId, Game game) {
        for (StackObject stackObject : game.getStack()) {
            if (isActivatedOrTriggeredAbility(stackObject)) {
                return true;
            }
        }
        return false;
    }

    @Override
    public Set<UUID> possibleTargets(UUID sourceId, UUID sourceControllerId, Game game) {
        return possibleTargets(sourceControllerId, game);
    }

    @Override
    public Set<UUID> possibleTargets(UUID sourceControllerId, Game game) {
        Set<UUID> possibleTargets = new HashSet<>();
        for (StackObject stackObject :  game.getStack()) {
            if (isActivatedOrTriggeredAbility(stackObject)) {
                possibleTargets.add(stackObject.getStackAbility().getId());
            }
        }
        return possibleTargets;
    }

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

    @Override
    public Filter getFilter() {
        return new FilterAbility();
    }

    static boolean isActivatedOrTriggeredAbility(StackObject stackObject) {
        if (stackObject == null) {
            return false;
        }
        if (stackObject instanceof Ability) {
            Ability ability = (Ability)stackObject;
            return ability.getAbilityType().equals(AbilityType.TRIGGERED) 
               || ability.getAbilityType().equals(AbilityType.ACTIVATED);
        }
        return false;
    }
}