--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/artifacts/src/main/java/org/dive4elements/river/exports/fixings/FixChartGenerator.java	Thu Apr 25 15:23:37 2013 +0200
@@ -0,0 +1,61 @@
+package org.dive4elements.river.exports.fixings;
+
+import org.dive4elements.artifacts.ArtifactNamespaceContext;
+import org.dive4elements.artifacts.CallContext;
+import org.dive4elements.artifacts.common.utils.XMLUtils;
+import org.dive4elements.river.exports.XYChartGenerator;
+
+import java.io.OutputStream;
+
+import org.apache.log4j.Logger;
+import org.w3c.dom.Document;
+
+/**
+ * Base class for FixChartGenerator.
+ */
+public abstract class FixChartGenerator
+extends XYChartGenerator
+{
+    /** Private logger. */
+    private static Logger logger = Logger.getLogger(FixChartGenerator.class);
+
+    public static final Double INVALID_KM = Double.valueOf(-1d);
+    public static final String CURRENT_KM = "currentKm";
+    public static final String XPATH_CHART_CURRENTKM =
+        "/art:action/art:attributes/art:currentKm/@art:km";
+
+    @Override
+    public void init(Document request, OutputStream out, CallContext context) {
+        super.init(request, out, context);
+
+        Double currentKm = getCurrentKmFromRequest(request);
+
+        if (logger.isDebugEnabled()) {
+            logger.debug("currentKm = " + currentKm);
+        }
+
+        if (currentKm != INVALID_KM) {
+            context.putContextValue(CURRENT_KM, currentKm);
+        }
+    }
+
+    public static final Double getCurrentKmFromRequest(Document request) {
+
+        String km = XMLUtils.xpathString(
+            request,
+            XPATH_CHART_CURRENTKM,
+            ArtifactNamespaceContext.INSTANCE);
+
+        if (km == null) {
+            return INVALID_KM;
+        }
+
+        try {
+            return Double.valueOf(km);
+        }
+        catch (NumberFormatException nfe) {
+            return INVALID_KM;
+        }
+    }
+}
+// vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :