// CollectionsTest.java
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.util.*;

public class CollectionsTest extends JApplet {

    private JTextField inputTextField;
    private JButton iterateButton;
    private JTextArea originalTextArea;
    private JTextArea iterateTextArea;
    private JRadioButton [] typeRadioButtons;
    private Object[] collectionTypes;       //array of Collection(s)
    private int currentCollectionType=0;


   public void init() {
       JLabel inputLabel;
       JButton clearButton;
       JButton sortButton;
       JButton reverseButton;
       JButton shuffleButton;
       ButtonGroup myButtonGroup;

       Container container = getContentPane();  
       container.setLayout( new FlowLayout() ); 
       
       inputLabel = new JLabel( "Input a string" );
       container.add( inputLabel );
       
       //string entered is displayed in textarea and added to current collection
      inputTextField = new JTextField( "", 10 );
      inputTextField.setFont( new Font( "SansSerif", Font.BOLD, 20) );
      container.add( inputTextField );
      inputTextField.addActionListener( 
        new  ActionListener() {
	    public void actionPerformed( ActionEvent event ) {
		String s = event.getActionCommand();
		originalTextArea.append( s + "\n" );
		//myTextField.setText( "" );
		((JTextField)(event.getSource())).setText( "" );
		//add it to current collection:
		((Collection)(collectionTypes[currentCollectionType])).add( s );
	    }
	}
      );


      //iterate over current collection and display in textarea
      iterateButton = new JButton( "Iterate" );
      iterateButton.setFont( new Font( "SansSerif", Font.BOLD, 20) );
      container.add( iterateButton );
      iterateButton.addActionListener( 
         new ActionListener() {
	     public void actionPerformed( ActionEvent event ) {
		 iterateTextArea.setText( "" );    //clear from previous
		 Iterator iter = ((Collection)(collectionTypes[currentCollectionType])).iterator();
		 while (iter.hasNext())
		     iterateTextArea.append( iter.next() + "\n" );
		 //JOptionPane.showMessageDialog( null, "button pressed!" );
	     }
	 }
      );

      sortButton = new JButton( "Sort" );
      sortButton.setFont( new Font( "SansSerif", Font.BOLD, 20) );
      container.add( sortButton );
      sortButton.addActionListener( 
         new ActionListener() {
	     public void actionPerformed( ActionEvent event ) {
		 if (collectionTypes[currentCollectionType] instanceof java.util.List)
		     Collections.sort((java.util.List)(collectionTypes[currentCollectionType]));
		 else
		     JOptionPane.showMessageDialog( null, "sorry, only Lists can be sorted" );
	     }
	 }
      );

      shuffleButton = new JButton( "Shuffle" );
      shuffleButton.setFont( new Font( "SansSerif", Font.BOLD, 20) );
      container.add( shuffleButton );
      shuffleButton.addActionListener( 
         new ActionListener() {
	     public void actionPerformed( ActionEvent event ) {
		 if (collectionTypes[currentCollectionType] instanceof java.util.List)
		     Collections.shuffle((java.util.List)(collectionTypes[currentCollectionType]));
		 else
		     JOptionPane.showMessageDialog( null, "sorry, only Lists can be shuffled" );
	     }
	 }
      );

      reverseButton = new JButton( "Reverse" );
      reverseButton.setFont( new Font( "SansSerif", Font.BOLD, 20) );
      container.add( reverseButton );
      reverseButton.addActionListener( 
         new ActionListener() {
	     public void actionPerformed( ActionEvent event ) {
		 if (collectionTypes[currentCollectionType] instanceof java.util.List)
		     Collections.reverse((java.util.List)(collectionTypes[currentCollectionType]));
		 else
		     JOptionPane.showMessageDialog( null, "sorry, only Lists can be reversed" );

	     }
	 }
      );

      clearButton = new JButton( "Clear" );
      clearButton.setFont( new Font( "SansSerif", Font.BOLD, 20) );
      container.add( clearButton );
      clearButton.addActionListener( 
         new ActionListener() {
	     public void actionPerformed( ActionEvent event ) {
		 iterateTextArea.setText( "" );  
		 originalTextArea.setText( "" ); 
		 ((Collection)collectionTypes[currentCollectionType]).clear();
	     }
	 }
      );


      String [] collectionNames= {"ArrayList", "LinkedList", "HashSet", 
				  "LinkedHashSet", "TreeSet"};
      typeRadioButtons = new JRadioButton[collectionNames.length];
      TypeRadioButtonHandler typeRadioButtonHandler = new TypeRadioButtonHandler();
      myButtonGroup = new ButtonGroup();

      for (int i=0; i<collectionNames.length; i++) {
	  typeRadioButtons[i] = new JRadioButton( collectionNames[i] );

	  container.add( typeRadioButtons[i] );
	  myButtonGroup.add( typeRadioButtons[i] );
	  typeRadioButtons[i].addItemListener( typeRadioButtonHandler );
      } 


      collectionTypes = new Object[collectionNames.length];
      for (int i=0; i<collectionNames.length; i++) {
	  switch (i) {
	  case 0: collectionTypes[i] = new ArrayList();
	      break;
	  case 1: collectionTypes[i] = new LinkedList();
	      break;
	  case 2: collectionTypes[i] = new HashSet();
	      break;
	  case 3: collectionTypes[i] = new LinkedHashSet();
	      break;
	  case 4: collectionTypes[i] = new TreeSet();
	      break;
	  default: System.out.println("Oops no such index");
	  }
      }


      originalTextArea = new JTextArea(10,10);
      originalTextArea.setEditable( false );
      originalTextArea.setFont( new Font( "SansSerif", Font.BOLD, 20) );
      container.add( new JScrollPane( originalTextArea ) ); 

      iterateTextArea = new JTextArea(10,10);
      iterateTextArea.setEditable( false );
      iterateTextArea.setFont( new Font( "SansSerif", Font.BOLD, 20) );
      container.add( new JScrollPane( iterateTextArea ) ); 

   }


    public void start() {
	typeRadioButtons[0].setSelected( true );   //start with ArrayList
	inputTextField.requestFocusInWindow();
    }
    

    private class TypeRadioButtonHandler implements ItemListener {
	public void itemStateChanged( ItemEvent event ) {
	    int i=0;
	    while (i<collectionTypes.length && 
		   event.getSource()!=typeRadioButtons[i])
		i++;

	    if (event.getStateChange() == ItemEvent.SELECTED) {
		
		((Collection)collectionTypes[i]).addAll( (Collection)collectionTypes[currentCollectionType] );

		((Collection)collectionTypes[currentCollectionType]).clear();
		currentCollectionType = i;
		iterateButton.requestFocus();
		iterateButton.setSelected( true );  //simulate press???

	    }
	    
	}
	
    }


}