Method to create an action to increment quest completions slot index

src/games/stendhal/server/maps/quests/AbstractQuest.java

@@ -17,6 +17,7 @@
 
 import games.stendhal.server.core.engine.SingletonRepository;
 import games.stendhal.server.entity.npc.NPCList;
+import games.stendhal.server.entity.npc.action.IncrementQuestAction;
 import games.stendhal.server.entity.player.Player;
 import marauroa.common.Pair;
 
@@ -166,6 +167,33 @@ public int getCompletedCount(final Player player) {
 		return completed ? 1 : 0;
 	}
 
+	/**
+	 * Retrieves action to execute when completions count should be incremented.
+	 *
+	 * NOTE: quest completions indexes should be set to use this method
+	 *
+	 * @param complete
+	 *   `true` to use "done" state index, `false` to use "active" state index.
+	 * @return
+	 *   `IncrementQuestAction` to increment slot where completions indexes are stored.
+	 */
+	protected IncrementQuestAction incrementCompletionsAction(final boolean complete) {
+		final Pair<Integer, Integer> indexes = questInfo.getCompletionsIndexes();
+		return new IncrementQuestAction(getSlotName(), complete ? indexes.second() : indexes.first(), 1);
+	}
+
+	/**
+	 * Retrieves action to execute when completions count should be incremented.
+	 *
+	 * NOTE: quest completions indexes should be set to use this method
+	 *
+	 * @return
+	 *   `IncrementQuestAction` to increment slot where completions indexes are stored.
+	 */
+	protected IncrementQuestAction incrementCompletionsAction() {
+		return incrementCompletionsAction(true);
+	}
+
 	@Override
 	public boolean isRepeatable(final Player player) {
 		// TODO implement