ChartPostProcessor


1   /* ================================================================
2    * Cewolf : Chart enabling Web Objects Framework
3    * ================================================================
4    *
5    * Project Info:  http://cewolf.sourceforge.net
6    * Project Lead:  Guido Laures (guido@laures.de);
7    *
8    * (C) Copyright 2002, by Guido Laures
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  
23  package de.laures.cewolf;
24  
25  import java.util.Map  ;
26  
27  /**
28   * Postprocesses a generated chart instance. Objects of this class can be used to
29   * customize a generated and afterwards rendered chart instance additionally.
30   * To provide a postprocessor the &lt;chartpostprocessor&gt; tag is used. 
31   * There can be an unlimited number of postprocessors registered.
32   * @see de.laures.cewolf.taglib.tags.ChartPostProcessorTag
33   * @author  Guido Laures
34   */
35  public interface ChartPostProcessor {
36  
37      /**
38       * Processes a generated chart. This method is called by the ChartProducer
39       * after a chart instance is generated and before it is rendered (if so).
40       * The ChartProducer is responsible for post processing a chart dependant
41       * on and only on the provided parameters. This means that the same parameters
42       * should result in the same post processings.
43       * @param chart the chart instnce. Concrete class depends on the rendering
44       * implementation. Currently a org.jfree.chart.JFreeChart is passed.
45       * @param params paramters passed to the postprocessor. These are defined in the JSP
46       * @see de.laures.cewolf.taglib.tags.ChartPostProcessorTag
47       */
48      void processChart(Object   chart, Map   params);
49  
50  }
51
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