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/*************************************************************************
*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* Copyright 2000, 2010 Oracle and/or its affiliates.
*
* OpenOffice.org - a multi-platform office productivity suite
*
* This file is part of OpenOffice.org.
*
* OpenOffice.org is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License version 3
* only, as published by the Free Software Foundation.
*
* OpenOffice.org is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License version 3 for more details
* (a copy is included in the LICENSE file that accompanied this code).
*
* You should have received a copy of the GNU Lesser General Public License
* version 3 along with OpenOffice.org. If not, see
* <http://www.openoffice.org/license.html>
* for a copy of the LGPLv3 License.
*
************************************************************************/
package com.sun.star.report;
/**
* Expressions are simple computation components.
*
* Expressions are always assumed to be immutable. They are not allowed to
* change their state and it is not guaranteed, in which order they get called.
* If the expression has been called before, the last computed value will be
* available from the datarow.
*
* This construct allows us to write expressions in the form
* "Sum := Sum + Column".
*
* Multiple calls to getValue on the same expression instance must return the
* same value (assuming that the datarow passed in is the same).
*/
public interface ReportExpression
{
void setParameters(Object[] parameters);
Object getParameters();
Object getValue(DataRow row);
}
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