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

This file is part of GNU Classpath.

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package javax.swing.table;

import javax.swing.event.TableModelListener;

/**
 * A <code>TableModel</code> is a two dimensional data structure that 
 * can store arbitrary <code>Object</code> instances, usually for the
 * purpose of display in a {@link JTable} component.  Individual objects
 * can be accessed by specifying the row index and column index for 
 * the object.  Each column in the model has a name associated with it.
 * <p>
 * The {@link DefaultTableModel} class provides one implementation of
 * this interface.
 * 
 * @author Andrew Selkirk
 */
public interface TableModel
{
  /**
   * Returns the number of rows in the model.
   * 
   * @return The row count.
   */
  int getRowCount();

  /**
   * Returns the number of columns in the model.
   * 
   * @return The column count
   */
  int getColumnCount();

  /**
   * Returns the name of a column in the model.
   * 
   * @param columnIndex the column index.
   * 
   * @return The column name.
   */
  String getColumnName(int columnIndex);

  /**
   * Returns the <code>Class</code> for all <code>Object</code> instances
   * in the specified column.  
   * 
   * @param columnIndex the column index.
   * 
   * @return The class.
   */
  Class getColumnClass(int columnIndex);

  /**
   * Returns <code>true</code> if the cell is editable, and <code>false</code>
   * otherwise.
   * 
   * @param rowIndex the row index.
   * @param columnIndex the column index.
   * 
   * @return <code>true</code> if editable, <code>false</code> otherwise.
   */
  boolean isCellEditable(int rowIndex, int columnIndex);

  /**
   * Returns the value (<code>Object</code>) at a particular cell in the
   * table.
   * 
   * @param rowIndex the row index.
   * @param columnIndex the column index.
   * 
   * @return The value at the specified cell.
   */
  Object getValueAt(int rowIndex, int columnIndex);

  /**
   * Sets the value at a particular cell in the table.  
   * 
   * @param aValue the value (<code>null</code> permitted).
   * @param rowIndex the row index.
   * @param columnIndex the column index.
   */
  void setValueAt(Object aValue, int rowIndex, int columnIndex);

  /**
   * Adds a listener to the model.  The listener will receive notification
   * of updates to the model.
   * 
   * @param listener the listener.
   */
  void addTableModelListener(TableModelListener listener);

  /**
   * Removes a listener from the model.
   * 
   * @param listener the listener.
   */
  void removeTableModelListener(TableModelListener listener);
}