import java.io.BufferedInputStream;
import java.io.DataInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;

/**
 * This class contains utility methods to read board position from the input file.
 * @author sanshack
 *
 */
public class FileReader {
	/**
	 * This method reads the position given in the filename.
	 * @param filename - input filename
	 * @return board position in the filename
	 */
	public String getPosition(String filename) {
		 	File file = new File(filename);
		    FileInputStream fis = null;
		    BufferedInputStream bis = null;
		    DataInputStream dis = null;
		    String message = null;
		    try {
		      fis = new FileInputStream(file);

		      // Here BufferedInputStream is added for fast reading.
		      bis = new BufferedInputStream(fis);
		      dis = new DataInputStream(bis);
		      // dis.available() returns 0 if the file does not have more lines.
		     ///////////////////////////////////////////////////////////////	      
		      message = dis.readLine(); 
		      if(message.length()!=23)System.out.println("Invalid Board Position");
		      dis.close();
		      bis.close();
		      fis.close();
		    }catch (FileNotFoundException f) {
		    	System.out.println(filename+" is not found");
		    }catch(IOException i) {
		    	System.out.println("Could not read from "+filename);
		    }
		    return message;   
	}
}