package de.unisiegen.gtitool.ui.logic;


import java.awt.event.ItemEvent;

import de.unisiegen.gtitool.ui.logic.interfaces.LogicClass;
import de.unisiegen.gtitool.ui.netbeans.NewDialogForm;
import de.unisiegen.gtitool.ui.netbeans.NewDialogGrammarChoiceForm;


/**
 * The {@link NewDialogChoice}.
 * 
 * @author Benjamin Mies
 * @version $Id$
 */
public final class NewDialogGrammarChoice implements
    LogicClass < NewDialogGrammarChoiceForm >
{

  /**
   * Signals the user choice
   */
  public enum Choice
  {
    /**
     * Contextfree is choosen.
     */
    CONTEXT_FREE,

    /**
     * Regular is choosen.
     */
    REGULAR;
  }


  /**
   * The {@link NewDialogForm}.
   */
  private NewDialogGrammarChoiceForm gui;


  /**
   * The actual user choice
   */
  private Choice actualChoice = Choice.REGULAR;


  /**
   * The parent Dialog containing this panel.
   */
  private NewDialog parent;


  /**
   * Creates a new {@link NewDialogChoice}.
   * 
   * @param parent The Dialog containing this panel
   */
  public NewDialogGrammarChoice ( NewDialog parent )
  {
    this.parent = parent;
    this.gui = new NewDialogGrammarChoiceForm ( this );
  }


  /**
   * {@inheritDoc}
   * 
   * @see LogicClass#getGUI()
   */
  public final NewDialogGrammarChoiceForm getGUI ()
  {
    return this.gui;
  }


  /**
   * Returns the user choice.
   * 
   * @return The user choice of this panel.
   */
  public final Choice getUserChoice ()
  {
    return this.actualChoice;
  }


  /**
   * Handle the cancel button pressed event.
   */
  public final void handleCancel ()
  {
    this.parent.getGUI ().dispose ();
  }


  /**
   * Handle Contextfree Item State changed.
   * 
   * @param evt The {@link ItemEvent}.
   */
  public final void handleContextFreeItemStateChanged ( ItemEvent evt )
  {
    if ( evt.getStateChange () == ItemEvent.SELECTED )
    {
      this.actualChoice = Choice.CONTEXT_FREE;
    }
  }


  /**
   * Handle the next button pressed event.
   */
  public final void handleNextGrammarChoice ()
  {
    this.parent.handleNextGrammarChoice ();
  }


  /**
   * Handle the previous button pressed event.
   */
  public final void handlePreviousGrammarChoice ()
  {
    this.parent.handlePreviousGrammarChoice ();
  }


  /**
   * Handle Regular Item State changed.
   * 
   * @param evt The {@link ItemEvent}.
   */
  public final void handleRegularGrammarItemStateChanged ( ItemEvent evt )
  {
    if ( evt.getStateChange () == ItemEvent.SELECTED )
    {
      this.actualChoice = Choice.REGULAR;
    }
  }
}