add new api method

plugin/src/main/java/net/momirealms/customfishing/mechanic/competition/ranking/LocalRankingImpl.java

@@ -20,6 +20,7 @@ package net.momirealms.customfishing.mechanic.competition.ranking;
 import net.momirealms.customfishing.api.common.Pair;
 import net.momirealms.customfishing.api.mechanic.competition.CompetitionPlayer;
 import net.momirealms.customfishing.api.mechanic.competition.Ranking;
+import org.jetbrains.annotations.Nullable;
 
 import java.util.*;
 
@@ -87,6 +88,20 @@ public class LocalRankingImpl implements Ranking {
         return null;
     }
 
+    @Override
+    public CompetitionPlayer getCompetitionPlayer(int rank) {
+        int i = 1;
+        int size = getSize();
+        if (rank > size) return null;
+        for (CompetitionPlayer player : competitionPlayers) {
+            if (rank == i) {
+                return player;
+            }
+            i++;
+        }
+        return null;
+    }
+
     /**
      * Returns an iterator for iterating over pairs of player names and scores.
      *

plugin/src/main/java/net/momirealms/customfishing/mechanic/competition/ranking/RedisRankingImpl.java

@@ -21,6 +21,7 @@ import net.momirealms.customfishing.api.common.Pair;
 import net.momirealms.customfishing.api.mechanic.competition.CompetitionPlayer;
 import net.momirealms.customfishing.api.mechanic.competition.Ranking;
 import net.momirealms.customfishing.storage.method.database.nosql.RedisManager;
+import org.jetbrains.annotations.Nullable;
 import redis.clients.jedis.Jedis;
 import redis.clients.jedis.resps.Tuple;
 
@@ -54,6 +55,15 @@ public class RedisRankingImpl implements Ranking {
         }
     }
 
+    @Override
+    public CompetitionPlayer getCompetitionPlayer(int rank) {
+        try (Jedis jedis = RedisManager.getInstance().getJedis()) {
+            List<Tuple> player = jedis.zrevrangeWithScores("cf_competition", rank - 1, rank -1);
+            if (player == null || player.size() == 0) return null;
+            return new CompetitionPlayer(player.get(0).getElement(), player.get(0).getScore());
+        }
+    }
+
     @Override
     public void addPlayer(CompetitionPlayer competitionPlayer) {
         try (Jedis jedis = RedisManager.getInstance().getJedis()) {