runelite-api: optimize getInteracting

runelite-api/src/main/java/net/runelite/api/Actor.java

@@ -60,11 +60,11 @@ public abstract class Actor extends Renderable
 
 		if (i < 0x8000)
 		{
-			return client.getNpcs()[i];
+			return client.getNpc(i);
 		}
 
 		i -= 0x8000;
-		return client.getPlayers()[i];
+		return client.getPlayer(i);
 	}
 
 	public int getHealthRatio()

runelite-api/src/main/java/net/runelite/api/Client.java

@@ -55,6 +55,12 @@ public class Client
 			.toArray(size -> new NPC[size]);
 	}
 
+	NPC getNpc(int idx)
+	{
+		net.runelite.rs.api.NPC npc = client.getCachedNPCs()[idx];
+		return npc != null ? new NPC(this, npc) : null;
+	}
+
 	public Player[] getPlayers()
 	{
 		return Arrays.stream(client.getCachedPlayers())
@@ -62,6 +68,12 @@ public class Client
 			.toArray(size -> new Player[size]);
 	}
 
+	Player getPlayer(int idx)
+	{
+		net.runelite.rs.api.Player player = client.getCachedPlayers()[idx];
+		return player != null ? new Player(this, player) : null;
+	}
+
 	@SuppressWarnings("unchecked")
 	public <T> T[] runQuery(Query query)
 	{