Source for org.jfree.formula.lvalues.DataTable

   1: /**
   2:  * =========================================
   3:  * LibFormula : a free Java formula library
   4:  * =========================================
   5:  *
   6:  * Project Info:  http://reporting.pentaho.org/libformula/
   7:  *
   8:  * (C) Copyright 2006-2007, by Pentaho Corporation and Contributors.
   9:  *
  10:  * This library is free software; you can redistribute it and/or modify it under the terms
  11:  * of the GNU Lesser General Public License as published by the Free Software Foundation;
  12:  * either version 2.1 of the License, or (at your option) any later version.
  13:  *
  14:  * This library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
  15:  * without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  16:  * See the GNU Lesser General Public License for more details.
  17:  *
  18:  * You should have received a copy of the GNU Lesser General Public License along with this
  19:  * library; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
  20:  * Boston, MA 02111-1307, USA.
  21:  *
  22:  * [Java is a trademark or registered trademark of Sun Microsystems, Inc.
  23:  * in the United States and other countries.]
  24:  *
  25:  *
  26:  * ------------
  27:  * $Id: DataTable.java,v 1.3 2007/04/01 13:51:54 taqua Exp $
  28:  * ------------
  29:  * (C) Copyright 2006-2007, by Pentaho Corporation.
  30:  */
  31: package org.jfree.formula.lvalues;
  32: 
  33: /**
  34:  * A database is a two dimensional collection of data, arranged in a table.
  35:  * Although we do not assume that the whole database is held in memory, we
  36:  * allow random access of the data.
  37:  *
  38:  * Columns may have names, but there is no enforced requirement for that.
  39:  *
  40:  * As a database is not just a collection of raw data, this interface returns
  41:  * LValues instead of plain objects. Columns may be computed values using
  42:  * formulas (the exact semantics of adressing database cells in a formula is
  43:  * beyond the scope of this specification and is implementation specific).
  44:  *
  45:  * @author Thomas Morgner
  46:  */
  47: public interface DataTable extends LValue
  48: {
  49:   public int getRowCount();
  50:   public int getColumnCount();
  51: 
  52:   public String getColumnName (int column);
  53:   public LValue getValueAt (int row, int column);
  54: }