diff -r 1612dbcec451 -r 639991d0808a java/cewolf-1.0/src/main/java/de/laures/cewolf/ChartPostProcessor.java
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/java/cewolf-1.0/src/main/java/de/laures/cewolf/ChartPostProcessor.java	Sat Feb 28 21:31:02 2009 +0100
@@ -0,0 +1,50 @@
+/* ================================================================
+ * Cewolf : Chart enabling Web Objects Framework
+ * ================================================================
+ *
+ * Project Info:  http://cewolf.sourceforge.net
+ * Project Lead:  Guido Laures (guido@laures.de);
+ *
+ * (C) Copyright 2002, by Guido Laures
+ *
+ * This library is free software; you can redistribute it and/or modify it under the terms
+ * of the GNU Lesser General Public License as published by the Free Software Foundation;
+ * either version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library 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.
+ *
+ * You should have received a copy of the GNU Lesser General Public License along with this
+ * library; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+package de.laures.cewolf;
+
+import java.util.Map;
+
+/**
+ * Postprocesses a generated chart instance. Objects of this class can be used to
+ * customize a generated and afterwards rendered chart instance additionally.
+ * To provide a postprocessor the <chartpostprocessor> tag is used. 
+ * There can be an unlimited number of postprocessors registered.
+ * @see de.laures.cewolf.taglib.tags.ChartPostProcessorTag
+ * @author  Guido Laures
+ */
+public interface ChartPostProcessor {
+
+    /**
+     * Processes a generated chart. This method is called by the ChartProducer
+     * after a chart instance is generated and before it is rendered (if so).
+     * The ChartProducer is responsible for post processing a chart dependant
+     * on and only on the provided parameters. This means that the same parameters
+     * should result in the same post processings.
+     * @param chart the chart instnce. Concrete class depends on the rendering
+     * implementation. Currently a org.jfree.chart.JFreeChart is passed.
+     * @param params paramters passed to the postprocessor. These are defined in the JSP
+     * @see de.laures.cewolf.taglib.tags.ChartPostProcessorTag
+     */
+    void processChart(Object chart, Map params);
+
+}