1 files changed, 63 insertions, 0 deletions
diff --git a/src/main/java/design/persistence/JSONLeagueDatabase.java b/src/main/java/design/persistence/JSONLeagueDatabase.java
new file mode 100644
index 0000000..01f4fc3
--- /dev/null
+++ b/src/main/java/design/persistence/JSONLeagueDatabase.java
@@ -0,0 +1,63 @@
+package design.persistence;
+
+import design.model.League;
+
+import java.io.File;
+import java.util.HashMap;
+import java.util.Map;
+
+public class JSONLeagueDatabase implements LeagueDatabase {
+
+    private static JSONLeagueDatabase INSTANCE;
+
+    public static JSONLeagueDatabase instance() {
+        if (INSTANCE == null) {
+            INSTANCE = new JSONLeagueDatabase("data/leaguedb.json");
+        }
+        return INSTANCE;
+    }
+
+    private final Map<Integer, League> cache;
+    private final File file;
+
+    public JSONLeagueDatabase(String filename) {
+        this.file = new File(filename);
+        this.cache = new HashMap<>();
+    }
+
+    private void load() {
+        //TODO impl
+    }
+
+    private void save() {
+        //TODO impl
+    }
+
+    @Override
+    public League getLeague(int id) {
+        return cache.get(id);
+    }
+
+    @Override
+    public League[] getLeagues() {
+        return cache.values().toArray(League[]::new);
+    }
+
+    @Override
+    public void addLeague(League league) {
+        cache.putIfAbsent(league.getId(), league);
+        save();
+    }
+
+    @Override
+    public void removeLeague(League league) {
+        cache.remove(league.getId());
+        save();
+    }
+
+    @Override
+    public void updateLeague(League league) {
+        cache.put(league.getId(), league);
+        save();
+    }
+}