Source Code : AbstractTableModel backed by Hashtable

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AbstractTableModel backed by Hashtable

     
/*
Definitive Guide to Swing for Java 2, Second Edition
By John Zukowski     
ISBN: 1-893115-78-X
Publisher: APress
*/

import java.awt.BorderLayout;
import java.awt.Point;
import java.util.Hashtable;

import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.table.AbstractTableModel;
import javax.swing.table.TableModel;

public class SparseTest {
  public static void main(String args[]) {
    JFrame frame = new JFrame("Sparse Test");
    String headers[] = { "English", "Japanese" };
    TableModel model = new SparseTableModel(10, headers);
    JTable table = new JTable(model);

    model.setValueAt("one", 0, 0);
    model.setValueAt("ten", 9, 0);
    model.setValueAt("roku - u516D", 5, 1);
    model.setValueAt("hachi - u516B", 8, 1);

    JScrollPane scrollPane = new JScrollPane(table);
    frame.getContentPane().add(scrollPane, BorderLayout.CENTER);
    frame.setSize(300, 150);
    frame.setVisible(true);
  }
}

class SparseTableModel extends AbstractTableModel {

  private Hashtable lookup;

  private final int rows;

  private final int columns;

  private final String headers[];

  public SparseTableModel(int rows, String columnHeaders[]) {
    if ((rows < 0) || (columnHeaders == null)) {
      throw new IllegalArgumentException(
          "Invalid row count/columnHeaders");
    }
    this.rows = rows;
    this.columns = columnHeaders.length;
    headers = columnHeaders;
    lookup = new Hashtable();
  }

  public int getColumnCount() {
    return columns;
  }

  public int getRowCount() {
    return rows;
  }

  public String getColumnName(int column) {
    return headers[column];
  }

  public Object getValueAt(int row, int column) {
    return lookup.get(new Point(row, column));
  }

  public void setValueAt(Object value, int row, int column) {
    if ((rows < 0) || (columns < 0)) {
      throw new IllegalArgumentException("Invalid row/column setting");
    }
    if ((row < rows) && (column < columns)) {
      lookup.put(new Point(row, column), value);
    }
  }
}

           
         
    
    
    
    
  

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