--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/artifacts/src/main/java/org/dive4elements/river/artifacts/services/BedKMChartService.java	Thu Apr 25 15:23:37 2013 +0200
@@ -0,0 +1,302 @@
+package org.dive4elements.river.artifacts.services;
+
+import java.awt.Color;
+import java.awt.Dimension;
+import java.awt.Transparency;
+import java.awt.image.BufferedImage;
+import java.io.ByteArrayOutputStream;
+import java.io.IOException;
+import java.util.Date;
+import java.util.List;
+
+import javax.imageio.ImageIO;
+
+import org.apache.log4j.Logger;
+import org.jfree.chart.ChartFactory;
+import org.jfree.chart.JFreeChart;
+import org.jfree.chart.axis.DateAxis;
+import org.jfree.chart.plot.PlotOrientation;
+import org.jfree.chart.plot.XYPlot;
+import org.jfree.chart.renderer.xy.XYLineAndShapeRenderer;
+import org.jfree.data.xy.XYSeries;
+import org.jfree.data.xy.XYSeriesCollection;
+import org.w3c.dom.Document;
+import org.w3c.dom.Element;
+import org.w3c.dom.NodeList;
+
+import org.dive4elements.artifactdatabase.DefaultService;
+import org.dive4elements.artifacts.CallMeta;
+import org.dive4elements.artifacts.GlobalContext;
+import org.dive4elements.artifacts.Service;
+import org.dive4elements.river.artifacts.model.minfo.BedOverview;
+import org.dive4elements.river.artifacts.model.minfo.BedOverviewFactory;
+import org.dive4elements.river.artifacts.resources.Resources;
+import org.dive4elements.river.backend.SedDBSessionHolder;
+import org.dive4elements.river.utils.KMIndex;
+
+public class BedKMChartService extends DefaultService {
+
+    private static final long serialVersionUID = -4946194087923870485L;
+
+    private static final Logger log =
+        Logger.getLogger(BedKMChartService.class);
+
+    public static final int DEFAULT_WIDTH  = 240;
+    public static final int DEFAULT_HEIGHT = 180;
+
+    public static final String I18N_CHART_LABEL =
+        "bed.km.chart.label";
+
+    public static final String DEFAULT_CHART_LABEL =
+        "Measuring Points";
+
+    public static final String I18N_CHART_TITLE =
+        "bed.km.chart.title";
+
+    public static final String DEFAULT_CHART_TITLE =
+        "Measuring points";
+
+    public static final String I18N_KM_AXIS =
+        "bed.km.chart.km.axis";
+
+    public static final String DEFAULT_KM_AXIS =
+        "km";
+
+    public static final String I18N_DATE_AXIS =
+        "bed.km.chart.date.axis";
+
+    public static final String DEFAULT_DATE_AXIS =
+        "Date";
+
+    public static final String DEFAULT_FORMAT = "png";
+
+    // TODO: Load fancy image from resources.
+    public static final byte [] EMPTY = {
+        (byte)0x89, (byte)0x50, (byte)0x4e, (byte)0x47,
+        (byte)0x0d, (byte)0x0a, (byte)0x1a, (byte)0x0a,
+        (byte)0x00, (byte)0x00, (byte)0x00, (byte)0x0d,
+        (byte)0x49, (byte)0x48, (byte)0x44, (byte)0x52,
+        (byte)0x00, (byte)0x00, (byte)0x00, (byte)0x01,
+        (byte)0x00, (byte)0x00, (byte)0x00, (byte)0x01,
+        (byte)0x08, (byte)0x00, (byte)0x00, (byte)0x00,
+        (byte)0x00, (byte)0x3a, (byte)0x7e, (byte)0x9b,
+        (byte)0x55, (byte)0x00, (byte)0x00, (byte)0x00,
+        (byte)0x01, (byte)0x73, (byte)0x52, (byte)0x47,
+        (byte)0x42, (byte)0x00, (byte)0xae, (byte)0xce,
+        (byte)0x1c, (byte)0xe9, (byte)0x00, (byte)0x00,
+        (byte)0x00, (byte)0x09, (byte)0x70, (byte)0x48,
+        (byte)0x59, (byte)0x73, (byte)0x00, (byte)0x00,
+        (byte)0x0b, (byte)0x13, (byte)0x00, (byte)0x00,
+        (byte)0x0b, (byte)0x13, (byte)0x01, (byte)0x00,
+        (byte)0x9a, (byte)0x9c, (byte)0x18, (byte)0x00,
+        (byte)0x00, (byte)0x00, (byte)0x07, (byte)0x74,
+        (byte)0x49, (byte)0x4d, (byte)0x45, (byte)0x07,
+        (byte)0xdc, (byte)0x04, (byte)0x04, (byte)0x10,
+        (byte)0x30, (byte)0x15, (byte)0x7d, (byte)0x77,
+        (byte)0x36, (byte)0x0b, (byte)0x00, (byte)0x00,
+        (byte)0x00, (byte)0x08, (byte)0x74, (byte)0x45,
+        (byte)0x58, (byte)0x74, (byte)0x43, (byte)0x6f,
+        (byte)0x6d, (byte)0x6d, (byte)0x65, (byte)0x6e,
+        (byte)0x74, (byte)0x00, (byte)0xf6, (byte)0xcc,
+        (byte)0x96, (byte)0xbf, (byte)0x00, (byte)0x00,
+        (byte)0x00, (byte)0x0a, (byte)0x49, (byte)0x44,
+        (byte)0x41, (byte)0x54, (byte)0x08, (byte)0xd7,
+        (byte)0x63, (byte)0xf8, (byte)0x0f, (byte)0x00,
+        (byte)0x01, (byte)0x01, (byte)0x01, (byte)0x00,
+        (byte)0x1b, (byte)0xb6, (byte)0xee, (byte)0x56,
+        (byte)0x00, (byte)0x00, (byte)0x00, (byte)0x00,
+        (byte)0x49, (byte)0x45, (byte)0x4e, (byte)0x44,
+        (byte)0xae, (byte)0x42, (byte)0x60, (byte)0x82
+    };
+
+    private static final Output empty() {
+        return new Output(EMPTY, "image/png");
+    }
+
+    @Override
+    public Service.Output process(
+        Document      data,
+        GlobalContext globalContext,
+        CallMeta      callMeta
+    ) {
+        log.debug("SQKMChartService.process");
+
+        SedDBSessionHolder.acquire();
+        try {
+            return doProcess(data, globalContext, callMeta);
+        }
+        finally {
+            SedDBSessionHolder.HOLDER.get().close();
+            SedDBSessionHolder.release();
+        }
+    }
+
+    protected Service.Output doProcess(
+        Document      input,
+        GlobalContext globalContext,
+        CallMeta      callMeta
+    ) {
+        String    river  = getRiverName(input);
+        Dimension extent = getExtent(input);
+        String    format = getFormat(input);
+
+        if (river == null) {
+            log.warn("River invalid.");
+            return empty();
+        }
+
+        BedOverview overview = BedOverviewFactory.getOverview(river);
+
+        if (overview == null) {
+            log.warn("No overview found for river '" + river + "'");
+            return empty();
+        }
+
+        KMIndex<List<Date>> entries = overview.filter(BedOverview.ACCEPT);
+
+        JFreeChart chart = createChart(entries, river, callMeta);
+
+        return encode(chart, extent, format);
+    }
+
+    protected static Output encode(
+        JFreeChart chart,
+        Dimension  extent,
+        String     format
+    ) {
+        BufferedImage image = chart.createBufferedImage(
+            extent.width, extent.height,
+            Transparency.BITMASK,
+            null);
+
+        ByteArrayOutputStream out = new ByteArrayOutputStream();
+
+        try {
+            ImageIO.write(image, format, out);
+        }
+        catch (IOException ioe) {
+            log.warn("writing image failed", ioe);
+            return empty();
+        }
+
+        return new Output(out.toByteArray(), "image/" + format);
+    }
+
+    protected static JFreeChart createChart(
+        KMIndex<List<Date>> entries,
+        String      river,
+        CallMeta    callMeta
+    ) {
+
+        XYSeriesCollection dataset = new XYSeriesCollection();
+        String key = Resources.format(
+            callMeta, I18N_CHART_LABEL, DEFAULT_CHART_LABEL, river);
+
+        XYSeries series = new XYSeries(key);
+        for (KMIndex.Entry<List<Date>> e: entries) {
+            double km = e.getKm();
+            List<Date> ds = e.getValue();
+            for (Date d: ds) {
+                series.add(km, d.getTime());
+            }
+        }
+
+        dataset.addSeries(series);
+        String title = Resources.format(
+            callMeta, I18N_CHART_TITLE, DEFAULT_CHART_TITLE, river);
+
+        String kmAxis = Resources.getMsg(
+            callMeta, I18N_KM_AXIS, DEFAULT_KM_AXIS);
+
+        String dateAxis = Resources.getMsg(
+            callMeta, I18N_DATE_AXIS, DEFAULT_DATE_AXIS);
+
+        JFreeChart chart = ChartFactory.createXYLineChart(
+            title,
+            kmAxis,
+            dateAxis,
+            null,
+            PlotOrientation.VERTICAL,
+            true,
+            true,
+            false);
+
+        XYPlot plot = (XYPlot)chart.getPlot();
+
+        DateAxis dA = new DateAxis();
+        plot.setRangeAxis(dA);
+        plot.setDataset(0, dataset);
+
+        chart.setBackgroundPaint(Color.white);
+        plot.setBackgroundPaint(Color.white);
+        plot.setDomainGridlinePaint(Color.gray);
+        plot.setRangeGridlinePaint(Color.gray);
+        plot.setDomainGridlinesVisible(true);
+        plot.setRangeGridlinesVisible(true);
+        XYLineAndShapeRenderer renderer = (XYLineAndShapeRenderer) plot.getRenderer();
+
+        renderer.setSeriesPaint(0, Color.gray);
+        renderer.setSeriesLinesVisible(0, false);
+        renderer.setSeriesShapesVisible(0, true);
+        renderer.setDrawOutlines(true);
+        return chart;
+    }
+
+
+    protected static String getRiverName(Document input) {
+        NodeList rivers = input.getElementsByTagName("river");
+
+        if (rivers.getLength() == 0) {
+            return null;
+        }
+
+        String river = ((Element)rivers.item(0)).getAttribute("name");
+
+        return river.length() > 0 ? river : null;
+    }
+
+    protected static Dimension getExtent(Document input) {
+
+        int width  = DEFAULT_WIDTH;
+        int height = DEFAULT_HEIGHT;
+
+        NodeList extents = input.getElementsByTagName("extent");
+
+        if (extents.getLength() > 0) {
+            Element element = (Element)extents.item(0);
+            String w = element.getAttribute("width");
+            String h = element.getAttribute("height");
+
+            try {
+                width = Math.max(1, Integer.parseInt(w));
+            }
+            catch (NumberFormatException nfe) {
+                log.warn("width '" + w + "' is not a valid.");
+            }
+
+            try {
+                height = Math.max(1, Integer.parseInt(h));
+            }
+            catch (NumberFormatException nfe) {
+                log.warn("height '" + h + "' is not a valid");
+            }
+        }
+
+        return new Dimension(width, height);
+    }
+
+    protected static String getFormat(Document input) {
+        String format = DEFAULT_FORMAT;
+
+        NodeList formats = input.getElementsByTagName("format");
+
+        if (formats.getLength() > 0) {
+            String type = ((Element)formats.item(0)).getAttribute("type");
+            if (type.length() > 0) {
+                format = type;
+            }
+        }
+
+        return format;
+    }
+}