Save and load the state of a JTable and TableColumn(name, width, position and sortKey)

• download example.jar
• download src.zip
• repository

Code

class DefaultTableModelPersistenceDelegate extends DefaultPersistenceDelegate {
  @Override protected void initialize(
        Class<?> type, Object oldInstance, Object newInstance, Encoder encoder) {
    super.initialize(type, oldInstance,  newInstance, encoder);
    DefaultTableModel m = (DefaultTableModel) oldInstance;
    for (int row = 0; row < m.getRowCount(); row++) {
      for (int col = 0; col < m.getColumnCount(); col++) {
        Object[] o = new Object[] {m.getValueAt(row, col), row, col};
        encoder.writeStatement(new Statement(oldInstance, "setValueAt", o));
      }
    }
  }
}

File file = File.createTempFile("output", ".xml");
try (XMLEncoder xe = new XMLEncoder(new BufferedOutputStream(new FileOutputStream(file)))) {
  xe.setPersistenceDelegate(
    RowSorter.SortKey.class,
    new DefaultPersistenceDelegate(new String[] {"column", "sortOrder"}));
  xe.writeObject(table.getRowSorter().getSortKeys());
//...

class TableColumnModelPersistenceDelegate extends DefaultPersistenceDelegate {
  @Override protected void initialize(
      Class<?> type, Object oldInstance, Object newInstance, Encoder encoder) {
    super.initialize(type, oldInstance, newInstance, encoder);
    DefaultTableColumnModel m = (DefaultTableColumnModel) oldInstance;
    for (int col = 0; col < m.getColumnCount(); col++) {
      Object[] o = {m.getColumn(col)};
      encoder.writeStatement(new Statement(oldInstance, "addColumn", o));
    }
  }
}

References

• Save and load the state of a JTable and TableColumn(name, width, position and sortKey)(Japanese)

JTable group directories first sorting

• download example.jar
• download src.zip
• repository

Code

// > dir /O:GN
// > ls --group-directories-first
class FileGroupComparator extends DefaultFileComparator {
  private static final long serialVersionUID = 1L;
  private final JTable table;
  public FileGroupComparator(JTable table, int column) {
    super(column);
    this.table = table;
  }

  @Override public int compare(File a, File b) {
    int flag = 1;
    List<? extends TableRowSorter.SortKey> keys =
        table.getRowSorter().getSortKeys();
    if (!keys.isEmpty()) {
      TableRowSorter.SortKey sortKey = keys.get(0);
      if (sortKey.getColumn() == column &&
          sortKey.getSortOrder() == SortOrder.DESCENDING) {
        flag = -1;
      }
    }
    if (a.isDirectory() && !b.isDirectory()) {
      return -1 * flag;
    } else if (!a.isDirectory() && b.isDirectory()) {
      return 1 * flag;
    } else {
      return super.compare(a, b);
    }
  }
}

References

• JTable group directories first sorting(Japanese)