Add referee table for multiple referees per event(fight)

src/de/steamwar/sql/Referee.java

@@ -0,0 +1,44 @@
+/*
+ *   This file is a part of the SteamWar software.
+ *
+ *   Copyright (C) 2024  SteamWar.de-Serverteam
+ *
+ *   This program is free software: you can redistribute it and/or modify
+ *   it under the terms of the GNU Affero General Public License as published by
+ *   the Free Software Foundation, either version 3 of the License, or
+ *   (at your option) any later version.
+ *
+ *   This program is distributed in the hope that it will be useful,
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ *   GNU Affero General Public License for more details.
+ *
+ *   You should have received a copy of the GNU Affero General Public License
+ *   along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package de.steamwar.sql;
+
+import de.steamwar.sql.internal.Field;
+import de.steamwar.sql.internal.SelectStatement;
+import de.steamwar.sql.internal.Table;
+import lombok.AllArgsConstructor;
+
+import java.util.Set;
+import java.util.stream.Collectors;
+
+@AllArgsConstructor
+public class Referee {
+
+    private static final Table<Referee> table = new Table<>(Referee.class);
+    private static final SelectStatement<Referee> byEvent = table.select("eventID");
+
+    public static Set<Integer> get(int eventID) {
+        return byEvent.listSelect(eventID).stream().map(referee -> referee.userID).collect(Collectors.toSet());
+    }
+
+    @Field(keys = {"eventReferee"})
+    private final int eventID;
+    @Field(keys = {"eventReferee"})
+    private final int userID;
+}