diff --git a/source/src/main/java/one/nem/lacerta/source/file/impl/FileManagerImpl.java b/source/src/main/java/one/nem/lacerta/source/file/impl/FileManagerImpl.java
index ed011f9c..b9c39de8 100644
--- a/source/src/main/java/one/nem/lacerta/source/file/impl/FileManagerImpl.java
+++ b/source/src/main/java/one/nem/lacerta/source/file/impl/FileManagerImpl.java
@@ -34,13 +34,21 @@ public class FileManagerImpl implements FileManager {
 
     // Injection
     private final LacertaLogger logger;
-
     @AssistedInject
     public FileManagerImpl(LacertaLogger logger, @Assisted Path rootDir) {
         this.logger = logger;
         this.rootDir = rootDir;
     }
 
+    // for generate new instance
+    public FileManagerImpl(LacertaLogger logger, Path rootDir, Path path, boolean autoCreateParent, boolean disableRootDirCheck) {
+        this.logger = logger;
+        this.rootDir = rootDir;
+        this.path = path;
+        this.autoCreateParent = autoCreateParent;
+        this.disableRootDirCheck = disableRootDirCheck;
+    }
+
     // Internal
     private Path resolveStringPath(String path) throws IOException{
         String[] pathArray = path.split("/");
@@ -61,6 +69,11 @@ public class FileManagerImpl implements FileManager {
         return resolvedPath;
     }
 
+    private FileManager newInstance(Path rootDir, Path path, boolean autoCreateParent, boolean disableRootDirCheck) {
+        logger.debug("newInstance", "Generating new instance");
+        return new FileManagerImpl(this.logger, rootDir, path, autoCreateParent, disableRootDirCheck);
+    }
+
     @Override
     public File getFileRef() {
         if (this.isExist()) {