Added a method that checks if the file exists.

Author: Xasmedy

src/main/java/net/mindustry_ddns/filestore/FileStore.java

@@ -80,6 +80,11 @@ static <T> FileStore<T> of(String path, Serializer<T> serializer) {
      */
     void setFile(File file);
 
+    /**
+     * @return If the file exists.
+     */
+    boolean doesFileExist();
+
     /**
      * Set the file where the object is stored.
      *

src/main/java/net/mindustry_ddns/filestore/SimpleFileStore.java

@@ -2,7 +2,6 @@
 
 import io.leangen.geantyref.TypeToken;
 import net.mindustry_ddns.filestore.serial.Serializer;
-
 import java.io.*;
 import java.nio.charset.StandardCharsets;
 
@@ -30,6 +29,11 @@ public void setFile(File file) {
         this.file = file;
     }
 
+    @Override
+    public boolean doesFileExist() {
+        return file.exists();
+    }
+
     @Override
     public T get() {
         return object;