start to write the multi dir tree

src/main/java/org/embulk/input/filename/FilenameFileInputPlugin.java

@@ -101,6 +101,11 @@ public class FilenameFileInputPlugin implements FileInputPlugin
 
     public interface PluginTask extends Task
     {
+        @Config("multi_dir")
+        @ConfigDefault("null")
+        Optional<List<String>> getMultiDir();
+        
+        
         @Config("path_prefix")
         String getPathPrefix();
 
@@ -157,6 +162,13 @@ public class FilenameFileInputPlugin implements FileInputPlugin
     public ConfigDiff transaction(ConfigSource config, FileInputPlugin.Control control)
     {
         PluginTask task = config.loadConfig(PluginTask.class);
+        
+        
+        Optional<List<String>> dirlst = task.getMultiDir();
+        
+        if (dirlst.isPresent()) {
+            log.info("The list of dir: " + dirlst);
+        }
 
         // list files recursively
         List<String> files = listFiles(task);
@@ -236,7 +248,6 @@ public class FilenameFileInputPlugin implements FileInputPlugin
             log.info("The File order is {}",files);
             configDiff.set("last_path", files.get(files.size() - 1));
         }
-     log.info("FileName 3 stop point");
         return configDiff;
     }