code: public static String getFileAbsoluteUri(String filePath){
  		String fileAbsoluteUri = filePath;
  		if (!filePath.startsWith("file://")){
  			fileAbsoluteUri = "file://".concat(filePath);
  		}	
  		return fileAbsoluteUri;		
  	}
docs: Calculate the file absolute URI. Something like for example file:///opt/sybhttpd/localhost.drives/SATA_DISK/ztesting/02.mp3
  Appends file:// if it's not included in the file path