Zone objective abstraction, cleanup

core/src/io/anuke/mindustry/game/Objective.java

@@ -0,0 +1,12 @@
+package io.anuke.mindustry.game;
+
+/** Defines a specific objective for a game. */
+public interface Objective{
+
+    /** @return whether this objective is met. */
+    boolean complete();
+
+    /** @return the string displayed when this objective is completed, in imperative form.
+     * e.g. when the objective is 'complete 10 waves', this would display "complete 10 waves".*/
+    String display();
+}

core/src/io/anuke/mindustry/game/Objectives.java

@@ -0,0 +1,38 @@
+package io.anuke.mindustry.game;
+
+/** Holds objective classes. */
+public class Objectives{
+
+    public static class WaveObjective implements Objective{
+        public int wave;
+
+        public WaveObjective(int wave){
+            this.wave = wave;
+        }
+
+        protected WaveObjective(){}
+
+        @Override
+        public boolean complete(){
+            return false;
+        }
+
+        @Override
+        public String display(){
+            return null;
+        }
+    }
+
+    public static class LaunchObjective implements Objective{
+
+        @Override
+        public boolean complete(){
+            return false;
+        }
+
+        @Override
+        public String display(){
+            return null;
+        }
+    }
+}