implemented a ConditionalAction for use in rewardWith()

src/games/stendhal/server/entity/npc/action/ConditionalAction.java

@@ -0,0 +1,68 @@
+/***************************************************************************
+ *                   (C) Copyright 2003-2023 - Stendhal                    *
+ ***************************************************************************
+ ***************************************************************************
+ *                                                                         *
+ *   This program is free software; you can redistribute it and/or modify  *
+ *   it under the terms of the GNU General Public License as published by  *
+ *   the Free Software Foundation; either version 2 of the License, or     *
+ *   (at your option) any later version.                                   *
+ *                                                                         *
+ ***************************************************************************/
+package games.stendhal.server.entity.npc.action;
+
+import games.stendhal.common.parser.Sentence;
+import games.stendhal.server.core.config.annotations.Dev;
+import games.stendhal.server.core.config.annotations.Dev.Category;
+import games.stendhal.server.entity.npc.ChatAction;
+import games.stendhal.server.entity.npc.ChatCondition;
+import games.stendhal.server.entity.npc.EventRaiser;
+import games.stendhal.server.entity.player.Player;
+
+/**
+ * executes an actions, if and only if, a condition is met.
+ */
+@Dev(category=Category.IGNORE)
+public class ConditionalAction implements ChatAction {
+
+	private final ChatCondition condition;
+	private final ChatAction action;
+
+	/**
+	 * Creates a new ConditionalAction.
+	 *
+	 * @param action
+	 *            action to execute
+	 */
+	public ConditionalAction(final ChatCondition condition, final ChatAction action) {
+		this.condition = condition;
+		this.action = action;
+	}
+
+	@Override
+	public void fire(final Player player, final Sentence sentence, final EventRaiser npc) {
+		if (condition.fire(player, sentence, player)) {
+			action.fire(player, sentence, npc);
+		}
+	}
+
+	@Override
+	public String toString() {
+		return "ConditionalAction <" + condition + ", " + action + ">";
+	}
+
+	@Override
+	public int hashCode() {
+		return 8363 * condition.hashCode() * action.hashCode();
+	}
+
+	@Override
+	public boolean equals(final Object obj) {
+		if (!(obj instanceof ConditionalAction)) {
+			return false;
+		}
+		final ConditionalAction other = (ConditionalAction) obj;
+		return condition.equals(other.condition) && action.equals(other.action);
+	}
+
+}