package commands;

import java.io.IOException;
import java.io.PipedOutputStream;

import kernel.AbstractProcess;
import kernel.AppException;

/**
 * Prints the current directory.
 * 
 * @author Václav Podlena
 */
public class pwd extends AbstractProcess {

  public void realization() throws AppException {
    PipedOutputStream output = (this.getOut() != null) ? (PipedOutputStream) this
        .getOut()
        : null;
    try {
      String s = new String(getParentCurrentPath() + "\n");
      output.write(s.getBytes());
      output.flush();
    } catch (IOException ioe) {
      ioe.printStackTrace();
      throw new AppException("Chyba I/O\n" + ioe.getMessage(), ioe);
    } catch (NullPointerException npe) {
      npe.printStackTrace();
      throw new AppException("Output není definován\n" + npe.getMessage(), npe);
    } catch (Exception e) {
      e.printStackTrace();
      throw new AppException("Neznámá Chyba.\n" + e.getMessage(), e);
    }
  }

  /**
   * Provides help for users.
   * 
   */
  public String getHelp() {
    return "\n\nDescription:\nPrints the current directory.\n\n";
  }
}