import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.table.*;

public class ColumnExample extends JFrame implements TableColumnModelListener {
    JTable jt;
    
    public ColumnExample() {
	super("Abstract Model JTable Test");
	
	//Create the table and give the data as a two-dimensional
	//String array and the column headers as a one-dimensional String array.
	jt = new JTable(new String[][] { {"This",    "is",      "cell 13"}, 
					 {"a",       "Test",    "cell 23" },
					 {"cell 31", "cell 32", "cell 33" } },
			new String[] {"BBBB", "CCCC", "AAAAA"});
	
	//Make the table use our default column modell.
	jt.setColumnModel(new SortingColumnModel());
	jt.createDefaultColumnsFromModel();
	
	//Listen for events from the column model.
	jt.getColumnModel().addColumnModelListener(this);
	
	//Place the table in a JScrollPane and display it.
	JScrollPane jsp = new JScrollPane(jt);
	getContentPane().add(jsp, BorderLayout.CENTER);
	addWindowListener(new WindowAdapter() {
		public void windowClosing(WindowEvent e) {
		    System.exit(0);
		}
	    });
	setSize(300, 200);
	setVisible(true);
    }
    
    public void columnAdded(TableColumnModelEvent e) {
	System.out.println("column added");
    }
    
    public void columnMarginChanged(ChangeEvent e) {
	System.out.println("column margin changed");
    }
    
    public void columnMoved(TableColumnModelEvent e) {
	System.out.println("column moved");
    }
    
    public void columnRemoved(TableColumnModelEvent e) {
	System.out.println("column removed");
    }
    
    public void columnSelectionChanged(ListSelectionEvent e) {
	System.out.println("selection: " + e.getFirstIndex() +
			    " - " + e.getLastIndex() + "  valueIsAdjusting: "
			    + e.getValueIsAdjusting());
	
	int[] sel = jt.getColumnModel().getSelectedColumns();
	for (int i = 0; i < sel.length; i++)
	    System.out.println("column " + sel[i] + " selected");
	
	System.out.println();
    }
    
    public static void main(String args[]) {
	new ColumnExample();
    }
    
}

/** A simple extension of the DefaultTableColumnModel class that sorts
    incoming columns.*/
class SortingColumnModel extends DefaultTableColumnModel {
    public SortingColumnModel() {
	setColumnMargin(20); 
    }
    
    public void addColumn(TableColumn tc) {
	//Override addColumn to make it sort the columns alphabetically.
	
	//First add the columns to the table.
	super.addColumn(tc);
	
	//Get the sorted index.
	int sortedIndex = sortedIndexOf(tc);
	//The TableColumn property modelIndex has nothing to do with 
	//the apperance on the screen. It is just the columns index
	//in the column model list of columns.
	//The method moveColumn actually moves to column on the screen.
	moveColumn(tc.getModelIndex(), sortedIndex);
    }
    
    protected int sortedIndexOf(TableColumn tc) {
	//This method i just a simple sort algorithm.
	// just do a linear search for now
	int stop = getColumnCount();
	//Sort by column header.
	String name = tc.getHeaderValue().toString();
	
	//The sort algorithm.
	for (int i = 0; i < stop; i++) {
	    if (name.compareTo(getColumn(i).getHeaderValue().toString()) <= 0) {
		return i;
	    }
	}
	
	return stop;
    }
    
}