[MKM] Implement Gadget Technician

Mage/src/main/java/mage/abilities/common/EntersBattlefieldOrTurnedFaceUpTriggeredAbility.java

@@ -0,0 +1,61 @@
+package mage.abilities.common;
+
+import mage.abilities.TriggeredAbilityImpl;
+import mage.abilities.effects.Effect;
+import mage.constants.Zone;
+import mage.game.Game;
+import mage.game.events.GameEvent;
+import mage.game.permanent.Permanent;
+
+import java.util.Objects;
+import java.util.Optional;
+
+/**
+ * @author TheElk801
+ */
+public class EntersBattlefieldOrTurnedFaceUpTriggeredAbility extends TriggeredAbilityImpl {
+
+    public EntersBattlefieldOrTurnedFaceUpTriggeredAbility(Effect effect) {
+        this(effect, false);
+    }
+
+    public EntersBattlefieldOrTurnedFaceUpTriggeredAbility(Effect effect, boolean optional) {
+        super(Zone.BATTLEFIELD, effect, optional);
+        this.setWorksFaceDown(true);
+        this.setTriggerPhrase("When {this} enters the battlefield or is turned face up, ");
+    }
+
+    private EntersBattlefieldOrTurnedFaceUpTriggeredAbility(final EntersBattlefieldOrTurnedFaceUpTriggeredAbility ability) {
+        super(ability);
+    }
+
+    @Override
+    public EntersBattlefieldOrTurnedFaceUpTriggeredAbility copy() {
+        return new EntersBattlefieldOrTurnedFaceUpTriggeredAbility(this);
+    }
+
+    @Override
+    public boolean checkEventType(GameEvent event, Game game) {
+        return event.getType() == GameEvent.EventType.TURNEDFACEUP
+                || event.getType() == GameEvent.EventType.ENTERS_THE_BATTLEFIELD;
+    }
+
+    @Override
+    public boolean checkTrigger(GameEvent event, Game game) {
+        if (!event.getTargetId().equals(this.getSourceId())) {
+            return false;
+        }
+        switch (event.getType()) {
+            case TURNEDFACEUP:
+                return true;
+            case ENTERS_THE_BATTLEFIELD:
+                Permanent sourcePermanent = getSourcePermanentIfItStillExists(game);
+                return Optional
+                        .ofNullable(getSourcePermanentIfItStillExists(game))
+                        .filter(Objects::nonNull)
+                        .map(permanent -> permanent.isFaceDown(game))
+                        .orElse(false);
+        }
+        return false;
+    }
+}