Research system progress

core/src/mindustry/game/CampaignData.java

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+package mindustry.game;
+
+import arc.*;
+import arc.struct.*;
+import mindustry.ctype.*;
+import mindustry.game.EventType.*;
+
+/** Stores unlocks and tech tree state. */
+public class CampaignData{
+    private ObjectSet<String> unlocked = new ObjectSet<>();
+
+    /** @return whether or not this piece of content is unlocked yet. */
+    public boolean isUnlocked(UnlockableContent content){
+        return content.alwaysUnlocked || unlocked.contains(content.name);
+    }
+
+    /**
+     * Makes this piece of content 'unlocked', if possible.
+     * If this piece of content is already unlocked, nothing changes.
+     */
+    public void unlockContent(UnlockableContent content){
+        if(content.alwaysUnlocked) return;
+
+        //fire unlock event so other classes can use it
+        if(unlocked.add(content.name)){
+            content.onUnlock();
+            Events.fire(new UnlockEvent(content));
+
+            save();
+        }
+    }
+
+    /** Clears all unlocked content. Automatically saves. */
+    public void reset(){
+        save();
+    }
+
+    @SuppressWarnings("unchecked")
+    public void load(){
+        unlocked = Core.settings.getJson("unlocked-content", ObjectSet.class, ObjectSet::new);
+    }
+
+    public void save(){
+        Core.settings.putJson("unlocked-content", String.class, unlocked);
+    }
+
+}