package com.nilhcem.fakesmtp.gui.tab;

 import com.nilhcem.fakesmtp.gui.info.ClearAllButton;

 import com.nilhcem.fakesmtp.model.EmailModel;

 import com.nilhcem.fakesmtp.server.MailSaver;

 import javax.swing.JScrollPane;

 import javax.swing.JTextArea;

 import java.util.Observable;

 import java.util.Observer;

 /**

  * Scrolled text area where will be displayed the last received email.

  *

  * @author Nilhcem

  * @since 1.0

  */

 public final class LastMailPane implements Observer {

         private final JScrollPane lastMailPane = new JScrollPane();

         private final JTextArea lastMailArea = new JTextArea();

         /**

          * Creates the text area and disables the possibility to edit it.

          */

         public LastMailPane() {

                 lastMailArea.setEditable(false);

                 lastMailPane.getViewport().add(lastMailArea, null);

         }

         /**

          * Returns the JScrollPane object.

          *

          * @return the JScrollPane object.

          */

         public JScrollPane get() {

                 return lastMailPane;

         }

         /**

          * Updates the content of the text area.

          * <p>

          * This method will be called by an observable element.

      * </p>

          * <ul>

          *   <li>If the observable is a {@link MailSaver} object, the text area will contain the content of the last received email;</li>

          *   <li>If the observable is a {@link ClearAllButton} object, the text area will be cleared.</li>

          * </ul>

          *

          * @param o the observable element which will notify this class.

          * @param data optional parameters (an {@code EmailModel} object, for the case of a {@code MailSaver} observable).

          */

         @Override

         public synchronized void update(Observable o, Object data) {

                 if (o instanceof MailSaver) {

                         EmailModel model = (EmailModel) data;

                         lastMailArea.setText(model.getEmailStr());

                 } else if (o instanceof ClearAllButton) {

                         lastMailArea.setText("");

                 }

         }

 }