--- a/gnv-artifacts/src/main/java/de/intevation/gnv/histogram/HistogramHelper.java	Wed Jun 09 09:37:57 2010 +0000
+++ b/gnv-artifacts/src/main/java/de/intevation/gnv/histogram/HistogramHelper.java	Wed Jun 09 09:51:05 2010 +0000
@@ -1,5 +1,11 @@
 package de.intevation.gnv.histogram;
 
+import de.intevation.artifacts.CallContext;
+
+import de.intevation.gnv.artifacts.ressource.RessourceFactory;
+
+import de.intevation.gnv.chart.ChartLabels;
+
 import de.intevation.gnv.geobackend.base.Result;
 import de.intevation.gnv.geobackend.base.ResultDescriptor;
 
@@ -9,6 +15,7 @@
 import java.util.Collection;
 import java.util.Iterator;
 import java.util.List;
+import java.util.Locale;
 
 import org.apache.log4j.Logger;
 
@@ -236,5 +243,92 @@
             "",
             fac.getRessource(locale, "histogram.axis.range.title", ""));
     }
+
+
+    public static Object[][] prepareVectorialHistogramData(Collection input) {
+        List names = new ArrayList<String>();
+        List data  = new ArrayList<Double[]>();
+
+        if (logger.isDebugEnabled()) {
+            logger.debug("######### prepare vectorial histogram data #######");
+            logger.debug("Input data size: " + input.size());
+        }
+
+        if (input == null) {
+            return new Object[0][0];
+        }
+
+        int sIdx = -1;
+        int yIdx = -1;
+
+        String series = null;
+
+        try {
+            Iterator iter = input.iterator();
+
+            if (iter.hasNext()) {
+                Result row = (Result) iter.next();
+                Result previousRow = row;
+
+                if (sIdx == -1 || yIdx == -1) {
+                    ResultDescriptor rd = row.getResultDescriptor();
+                    sIdx = rd.getColumnIndex("SERIES");
+                    yIdx = rd.getColumnIndex("YORDINATE");
+
+                    if (sIdx == -1 || yIdx == -1) {
+                        return new Object[0][0];
+                    }
+                }
+
+                List values = new ArrayList<Double>();
+                while (iter.hasNext()) {
+                    row = (Result) iter.next();
+
+                    // found new series
+                    if (series != null && !series.equals(row.getString(sIdx))) {
+
+                        // add values and parameter name
+                        data.add((Double[])
+                            values.toArray(new Double[values.size()]));
+                        names.add(series);
+
+                        if (logger.isDebugEnabled()) {
+                            logger.debug(" --- series name: " + series);
+                            logger.debug(" --- series items: " + values.size());
+                        }
+
+                        values.clear();
+                    }
+
+                    Double value = row.getDouble(yIdx);
+                    if (value != null)
+                        values.add(value);
+
+                    series = row.getString(sIdx);
+                }
+
+                if (logger.isDebugEnabled()) {
+                    logger.debug(" --- series name: " + series);
+                    logger.debug(" --- series items: " + values.size());
+                }
+
+                data.add((Double[]) values.toArray(new Double[values.size()]));
+                names.add(series);
+            }
+        }
+        catch (Exception e) {
+            logger.error(e.getMessage(), e);
+        }
+
+        int count = data.size();
+        logger.debug(" === Found total: " + count);
+        Object[][] obj = new Object[count][2];
+        for (int i = 0; i < count; i++) {
+            obj[i][0] = names.get(i);
+            obj[i][1] = (Double[]) data.get(i);
+        }
+
+        return obj;
+    }
 }
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