/*
* This program is free software; you can redistribute it and/or modify it under the
* terms of the GNU Lesser General Public License, version 2.1 as published by the Free Software
* Foundation.
*
* You should have received a copy of the GNU Lesser General Public License along with this
* program; if not, you can obtain a copy at http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html
* or from the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
* This program 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 for more details.
*
* Copyright (c) 2001 - 2013 Object Refinery Ltd, Pentaho Corporation and Contributors.. All rights reserved.
*/
package org.pentaho.reporting.engine.classic.core.function;
import org.pentaho.reporting.engine.classic.core.event.ReportListener;
/**
* The interface for report functions. A report function separates the business logic from presentation of the result.
* The function is called whenever JFreeReport changes its state while generating the report. The working model for the
* functions is based on cloning the state of the function on certain checkpoints to support the ReportState
* implementation of JFreeReport.
* <p/>
* Although functions support the ReportListener interface, they are not directly added to a report. A report
* FunctionCollection is used to control the functions. Functions are required to be cloneable.
* <p/>
*
* @author Thomas Morgner
*/
public interface Function extends ReportListener, Expression {
}