DefaultTableModel.java

/* DefaultTableModel.java --
   Copyright (C) 2002, 2004, 2005, 2006, Free Software Foundation, Inc.

This file is part of GNU Classpath.

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permission to link this library with independent modules to produce an
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package javax.swing.table;

import java.io.Serializable;
import java.util.Vector;

import javax.swing.event.TableModelEvent;

/**
 * A two dimensional data structure used to store <code>Object</code> 
 * instances, usually for display in a <code>JTable</code> component.
 * 
 * @author	Andrew Selkirk
 */
public class DefaultTableModel extends AbstractTableModel
  implements Serializable
{
  static final long serialVersionUID = 6680042567037222321L;

  /**
   * Storage for the rows in the table (each row is itself 
   * a <code>Vector</code>).
   */
  protected Vector dataVector;

  /**
   * Storage for the column identifiers.
   */
  protected Vector columnIdentifiers;

  /**
   * Creates an empty table with zero rows and zero columns.
   */
  public DefaultTableModel() 
  {
    this(0, 0);
  }
  
  /**
   * Creates a new table with the specified number of rows and columns.
   * All cells in the table are initially empty (set to <code>null</code>).
   * 
   * @param numRows  the number of rows.
   * @param numColumns  the number of columns.
   */
  public DefaultTableModel(int numRows, int numColumns) 
  {
    Vector defaultNames = new Vector(numColumns);
    Vector data = new Vector(numRows);
    for (int i = 0; i < numColumns; i++) 
      {
        defaultNames.add(super.getColumnName(i));
      }          
    for (int r = 0; r < numRows; r++) 
      {
        Vector tmp = new Vector(numColumns);
        tmp.setSize(numColumns);
        data.add(tmp);
      }
    setDataVector(data, defaultNames);
  }
  
  /**
   * Creates a new table with the specified column names and number of
   * rows.  The number of columns is determined by the number of column
   * names supplied.
   *   
   * @param columnNames the column names.
   * @param numRows the number of rows.
   */
  public DefaultTableModel(Vector columnNames, int numRows) 
  {
    if (numRows < 0)
      throw new IllegalArgumentException("numRows < 0");
    Vector data = new Vector();
    int numColumns = 0;

    if (columnNames != null)
      numColumns = columnNames.size();
    
    while (0 < numRows--) 
      {
        Vector rowData = new Vector();
        rowData.setSize(numColumns);
        data.add(rowData);
      }
    setDataVector(data, columnNames);
  }

  /**
   * Creates a new table with the specified column names and row count.
   * 
   * @param columnNames the column names.
   * @param numRows the number of rows.
   */
  public DefaultTableModel(Object[] columnNames, int numRows) 
  {
    this(convertToVector(columnNames), numRows);
  }
  
  /**
   * Creates a new table with the specified data values and column names.
   * 
   * @param data the data values.
   * @param columnNames the column names.
   */
  public DefaultTableModel(Vector data, Vector columnNames) 
  {
    setDataVector(data, columnNames);
  }

  /**
   * Creates a new table with the specified data values and column names.
   * 
   * @param data the data values.
   * @param columnNames the column names.
   */
  public DefaultTableModel(Object[][] data, Object[] columnNames) 
  {
    this(convertToVector(data), convertToVector(columnNames));
  }

  /**
   * Returns the vector containing the row data for the table.
   * 
   * @return The data vector.
   */
  public Vector getDataVector() 
  {
    return dataVector;
  }

  /**
   * Sets the data and column identifiers for the table.  The data vector
   * contains a <code>Vector</code> for each row in the table - if the
   * number of objects in each row does not match the number of column
   * names specified, the row data is truncated or expanded (by adding
   * <code>null</code> values) as required.
   * 
   * @param data the data for the table (a vector of row vectors).
   * @param columnNames the column names.
   * 
   * @throws NullPointerException if either argument is <code>null</code>.
   */
  public void setDataVector(Vector data, Vector columnNames) 
  {
    if (data == null)
      dataVector = new Vector();
    else
      dataVector = data;
    setColumnIdentifiers(columnNames);
  }

  /**
   * Sets the data and column identifiers for the table.
   * 
   * @param data the data for the table.
   * @param columnNames the column names.
   * 
   * @throws NullPointerException if either argument is <code>null</code>.
   */
  public void setDataVector(Object[][] data, Object[] columnNames) 
  {
    setDataVector(convertToVector(data), 
                  convertToVector(columnNames));
  }
  
  /**
   * Sends the specified <code>event</code> to all registered listeners.
   * This method is equivalent to 
   * {@link AbstractTableModel#fireTableChanged(TableModelEvent)}.
   * 
   * @param event the event.
   */
  public void newDataAvailable(TableModelEvent event) 
  {
    fireTableChanged(event);
  }

  /**
   * Sends the specified <code>event</code> to all registered listeners.
   * This method is equivalent to 
   * {@link AbstractTableModel#fireTableChanged(TableModelEvent)}.
   * 
   * @param event the event.
   */
  public void newRowsAdded(TableModelEvent event) 
  {
    fireTableChanged(event);
  }

  /**
   * Sends the specified <code>event</code> to all registered listeners.
   * This method is equivalent to 
   * {@link AbstractTableModel#fireTableChanged(TableModelEvent)}.
   * 
   * @param event the event.
   */
  public void rowsRemoved(TableModelEvent event) 
  {
    fireTableChanged(event);
  }

  /**
   * Sets the column identifiers, updates the data rows (truncating
   * or padding each row with <code>null</code> values) to match the 
   * number of columns, and sends a {@link TableModelEvent} to all
   * registered listeners.
   * 
   * @param columnIdentifiers the column identifiers.
   */
  public void setColumnIdentifiers(Vector columnIdentifiers) 
  {
    this.columnIdentifiers = columnIdentifiers;
    setColumnCount(columnIdentifiers == null ? 0 : columnIdentifiers.size());
  }
  
  /**
   * Sets the column identifiers, updates the data rows (truncating
   * or padding each row with <code>null</code> values) to match the 
   * number of columns, and sends a {@link TableModelEvent} to all
   * registered listeners.
   * 
   * @param columnIdentifiers the column identifiers.
   */
  public void setColumnIdentifiers(Object[] columnIdentifiers) 
  {
    setColumnIdentifiers(convertToVector(columnIdentifiers));
  }

  /**
   * This method is obsolete, use {@link #setRowCount(int)} instead.
   * 
   * @param numRows the number of rows.
   */
  public void setNumRows(int numRows) 
  {
    setRowCount(numRows);
  }

  /**
   * Sets the number of rows in the table.  If <code>rowCount</code> is less
   * than the current number of rows in the table, rows are discarded.
   * If <code>rowCount</code> is greater than the current number of rows in
   * the table, new (empty) rows are added.
   * 
   * @param rowCount the row count.
   */
  public void setRowCount(int rowCount) 
  {
    int existingRowCount = dataVector.size();
    if (rowCount < existingRowCount) 
    {
      dataVector.setSize(rowCount);
      fireTableRowsDeleted(rowCount, existingRowCount - 1);      
    }
    else 
    {
      int rowsToAdd = rowCount - existingRowCount;
      addExtraRows(rowsToAdd, columnIdentifiers.size());
      fireTableRowsInserted(existingRowCount, rowCount - 1);
    }
  }

  /**
   * Sets the number of columns in the table.  Existing rows are truncated
   * or padded with <code>null</code> values to match the new column count.
   * A {@link TableModelEvent} is sent to all registered listeners.
   * 
   * @param columnCount the column count.
   */
  public void setColumnCount(int columnCount) 
  {
    for (int i = 0; i < dataVector.size(); ++i)
      {
        ((Vector) dataVector.get(i)).setSize(columnCount);
      }
    if (columnIdentifiers != null)  
      columnIdentifiers.setSize(columnCount);
    fireTableStructureChanged();
  }

  /**
   * Adds a column with the specified name to the table.  All cell values
   * for the column are initially set to <code>null</code>.
   * 
   * @param columnName the column name (<code>null</code> permitted).
   */
  public void addColumn(Object columnName) 
  {
    addColumn(columnName, (Object[]) null);
  }

  /**
   * Adds a column with the specified name and data values to the table.  
   * 
   * @param columnName the column name (<code>null</code> permitted).
   * @param columnData the column data.
   */
  public void addColumn(Object columnName, Vector columnData) 
  {
    Object[] dataArray = null;
    if (columnData != null) 
    {
      int rowCount = dataVector.size();
      if (columnData.size() < rowCount)
        columnData.setSize(rowCount);
      dataArray = columnData.toArray();
    }
    addColumn(columnName, dataArray);
  }

  /**
   * Adds a column with the specified name and data values to the table.
   * 
   * @param columnName the column name (<code>null</code> permitted).
   * @param columnData the column data.
   */
  public void addColumn(Object columnName, Object[] columnData) 
  {
    if (columnData != null)
    {
      // check columnData array for cases where the number of items
      // doesn't match the number of rows in the existing table
      if (columnData.length > dataVector.size()) 
      {
        int rowsToAdd = columnData.length - dataVector.size();
        addExtraRows(rowsToAdd, columnIdentifiers.size());
      }
      else if (columnData.length < dataVector.size())
      {
        Object[] tmp = new Object[dataVector.size()];
        System.arraycopy(columnData, 0, tmp, 0, columnData.length);
        columnData = tmp;
      }
    }
    for (int i = 0; i < dataVector.size(); ++i)
      {
        ((Vector) dataVector.get(i)).add(columnData == null ? null : columnData[i]);
      }
    columnIdentifiers.add(columnName);
    fireTableStructureChanged();
  }

  /**
   * Adds a new row containing the specified data to the table and sends a
   * {@link TableModelEvent} to all registered listeners.
   * 
   * @param rowData the row data (<code>null</code> permitted).
   */
  public void addRow(Vector rowData) 
  {
    int rowIndex = dataVector.size();
    dataVector.add(rowData);
    newRowsAdded(new TableModelEvent(
      this, rowIndex, rowIndex, -1, TableModelEvent.INSERT)
    );
  }

  /**
   * Adds a new row containing the specified data to the table and sends a
   * {@link TableModelEvent} to all registered listeners.
   * 
   * @param rowData the row data (<code>null</code> permitted).
   */
  public void addRow(Object[] rowData) 
  {
    addRow(convertToVector(rowData));
  }

  /**
   * Inserts a new row into the table.
   * 
   * @param row the row index.
   * @param rowData the row data.
   */
  public void insertRow(int row, Vector rowData) 
  {
    dataVector.add(row, rowData);
    fireTableRowsInserted(row, row);
  }

  /**
   * Inserts a new row into the table.
   * 
   * @param row the row index.
   * @param rowData the row data.
   */
  public void insertRow(int row, Object[] rowData) 
  {
    insertRow(row, convertToVector(rowData));
  }

  /**
   * Moves the rows from <code>startIndex</code> to <code>endIndex</code>
   * (inclusive) to the specified row.
   * 
   * @param startIndex the start row.
   * @param endIndex the end row.
   * @param toIndex the row to move to.
   */
  public void moveRow(int startIndex, int endIndex, int toIndex) 
  {
    Vector removed = new Vector();
    for (int i = endIndex; i >= startIndex; i--)
    {
      removed.add(this.dataVector.remove(i));
    }
    for (int i = 0; i <= endIndex - startIndex; i++) 
    {
      dataVector.insertElementAt(removed.get(i), toIndex);  
    }
    int firstRow = Math.min(startIndex, toIndex);
    int lastRow = Math.max(endIndex, toIndex + (endIndex - startIndex));
    fireTableRowsUpdated(firstRow, lastRow);
  }

  /**
   * Removes a row from the table and sends a {@link TableModelEvent} to
   * all registered listeners.
   * 
   * @param row the row index.
   */
  public void removeRow(int row) 
  {
    dataVector.remove(row);
    fireTableRowsDeleted(row, row);
  }

  /**
   * Returns the number of rows in the model.
   * 
   * @return The row count.
   */
  public int getRowCount() 
  {
    return dataVector.size();
  }

  /**
   * Returns the number of columns in the model.
   * 
   * @return The column count.
   */
  public int getColumnCount() 
  {
    return columnIdentifiers == null ? 0 : columnIdentifiers.size();
  }

  /**
   * Get the name of the column. If the column has the column identifier set,
   * the return value is the result of the .toString() method call on that
   * identifier. If the identifier is not explicitly set, the returned value
   * is calculated by {@link AbstractTableModel#getColumnName(int)}.
   * 
   * @param column the column index.
   * 
   * @return The column name.
   */
  public String getColumnName(int column)
  {
    String result = "";
    if (columnIdentifiers == null) 
      result = super.getColumnName(column);
    else 
    {
      if (column < getColumnCount())
      {
        checkSize();
        Object id = columnIdentifiers.get(column);
        if (id != null) 
          result = id.toString();
        else
          result = super.getColumnName(column);
      }
      else
        result = super.getColumnName(column);
    }
    return result;
  }

  /**
   * Returns <code>true</code> if the specified cell can be modified, and
   * <code>false</code> otherwise.  For this implementation, the method
   * always returns <code>true</code>.
   * 
   * @param row the row index.
   * @param column the column index.
   * 
   * @return <code>true</code> in all cases.
   */
  public boolean isCellEditable(int row, int column) 
  {
    return true;
  }

  /**
   * Returns the value at the specified cell in the table.
   * 
   * @param row the row index.
   * @param column the column index.
   * 
   * @return The value (<code>Object</code>, possibly <code>null</code>) at 
   *         the specified cell in the table.
   */
  public Object getValueAt(int row, int column) 
  {
    return ((Vector) dataVector.get(row)).get(column);
  }

  /**
   * Sets the value for the specified cell in the table and sends a 
   * {@link TableModelEvent} to all registered listeners.
   * 
   * @param value the value (<code>Object</code>, <code>null</code> permitted).
   * @param row the row index.
   * @param column the column index.
   */
  public void setValueAt(Object value, int row, int column) 
  {
    ((Vector) dataVector.get(row)).set(column, value);
    fireTableCellUpdated(row, column);
  }

  /**
   * Converts the data array to a <code>Vector</code>.
   * 
   * @param data the data array (<code>null</code> permitted).
   * 
   * @return A vector (or <code>null</code> if the data array 
   *         is <code>null</code>).
   */
  protected static Vector convertToVector(Object[] data) 
  {
    if (data == null)
      return null;
    Vector vector = new Vector(data.length);
    for (int i = 0; i < data.length; i++) 
      vector.add(data[i]);
    return vector;          
  }
  
  /**
   * Converts the data array to a <code>Vector</code> of rows.
   * 
   * @param data the data array (<code>null</code> permitted).
   * 
   * @return A vector (or <code>null</code> if the data array 
   *         is <code>null</code>.
   */
  protected static Vector convertToVector(Object[][] data) 
  {
    if (data == null)
      return null;
    Vector vector = new Vector(data.length);
    for (int i = 0; i < data.length; i++)
      vector.add(convertToVector(data[i]));
    return vector;
  }

  /**
   * This method adds some rows to <code>dataVector</code>.
   *
   * @param rowsToAdd number of rows to add
   * @param nbColumns size of the added rows
   */
  private void addExtraRows(int rowsToAdd, int nbColumns)
  {
    for (int i = 0; i < rowsToAdd; i++) 
      {
        Vector tmp = new Vector();
        tmp.setSize(columnIdentifiers.size());
        dataVector.add(tmp);
      } 
  }

  /**
   * Checks the real columns/rows sizes against the ones returned by
   * <code>getColumnCount()</code> and <code>getRowCount()</code>.
   * If the supposed one are bigger, then we grow <code>columIdentifiers</code>
   * and <code>dataVector</code> to their expected size.
   */
  private void checkSize()
  {
    int columnCount = getColumnCount();
    int rowCount = getRowCount();
    
    if (columnCount > columnIdentifiers.size())
      columnIdentifiers.setSize(columnCount);
           
    if (dataVector != null && rowCount > dataVector.size())
      {
        int rowsToAdd = rowCount - dataVector.size();
        addExtraRows(rowsToAdd, columnCount);
      }
  }
}