franta-hg@1: /* ================================================================
franta-hg@1:  * Cewolf : Chart enabling Web Objects Framework
franta-hg@1:  * ================================================================
franta-hg@1:  *
franta-hg@1:  * Project Info:  http://cewolf.sourceforge.net
franta-hg@1:  * Project Lead:  Guido Laures (guido@laures.de);
franta-hg@1:  *
franta-hg@1:  * (C) Copyright 2002, by Guido Laures
franta-hg@1:  *
franta-hg@1:  * This library is free software; you can redistribute it and/or modify it under the terms
franta-hg@1:  * of the GNU Lesser General Public License as published by the Free Software Foundation;
franta-hg@1:  * either version 2.1 of the License, or (at your option) any later version.
franta-hg@1:  *
franta-hg@1:  * This library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
franta-hg@1:  * without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
franta-hg@1:  * See the GNU Lesser General Public License for more details.
franta-hg@1:  *
franta-hg@1:  * You should have received a copy of the GNU Lesser General Public License along with this
franta-hg@1:  * library; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
franta-hg@1:  * Boston, MA 02111-1307, USA.
franta-hg@1:  */
franta-hg@1: 
franta-hg@1: package de.laures.cewolf;
franta-hg@1: 
franta-hg@1: import java.util.Map;
franta-hg@1: 
franta-hg@1: /**
franta-hg@1:  * Postprocesses a generated chart instance. Objects of this class can be used to
franta-hg@1:  * customize a generated and afterwards rendered chart instance additionally.
franta-hg@1:  * To provide a postprocessor the <chartpostprocessor> tag is used. 
franta-hg@1:  * There can be an unlimited number of postprocessors registered.
franta-hg@1:  * @see de.laures.cewolf.taglib.tags.ChartPostProcessorTag
franta-hg@1:  * @author  Guido Laures
franta-hg@1:  */
franta-hg@1: public interface ChartPostProcessor {
franta-hg@1: 
franta-hg@1:     /**
franta-hg@1:      * Processes a generated chart. This method is called by the ChartProducer
franta-hg@1:      * after a chart instance is generated and before it is rendered (if so).
franta-hg@1:      * The ChartProducer is responsible for post processing a chart dependant
franta-hg@1:      * on and only on the provided parameters. This means that the same parameters
franta-hg@1:      * should result in the same post processings.
franta-hg@1:      * @param chart the chart instnce. Concrete class depends on the rendering
franta-hg@1:      * implementation. Currently a org.jfree.chart.JFreeChart is passed.
franta-hg@1:      * @param params paramters passed to the postprocessor. These are defined in the JSP
franta-hg@1:      * @see de.laures.cewolf.taglib.tags.ChartPostProcessorTag
franta-hg@1:      */
franta-hg@1:     void processChart(Object chart, Map params);
franta-hg@1: 
franta-hg@1: }