Notes

package gui_Window;

import java.io.File;

import javax.swing.JOptionPane;

public class FileValidator {
/**
*
* @param file
* @return
*/
public static boolean validateFile(File file) {
String errorMessage = ""; //string to hold the error messages for dialogue box
String extract_FileName = file.getName(); //extract filename from the file
//If the file is empty
if (file.length() == 0) {
errorMessage = "The file is empty!n";
JOptionPane.showMessageDialog(null, errorMessage,"Error Reading : " + extract_FileName,JOptionPane.ERROR_MESSAGE);
return false;
}
//Check if the selected file is not .txt file.
else if(!extract_FileName.substring(extract_FileName.lastIndexOf("."), extract_FileName.length()).equals(".txt")) {
errorMessage = "Unsupported File!n";
JOptionPane.showMessageDialog(null, errorMessage,"Unsupported file format" + extract_FileName,JOptionPane.ERROR_MESSAGE);
return false;
}
return true;
}
}