--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/flys-client/src/main/java/org/dive4elements/river/client/server/ChartServiceHelper.java	Thu Apr 25 12:31:32 2013 +0200
@@ -0,0 +1,217 @@
+package de.intevation.flys.client.server;
+
+import java.util.Map;
+
+import org.w3c.dom.Document;
+import org.w3c.dom.Element;
+
+import org.apache.log4j.Logger;
+
+import de.intevation.artifacts.common.ArtifactNamespaceContext;
+import de.intevation.artifacts.common.utils.XMLUtils;
+import de.intevation.artifacts.common.utils.XMLUtils.ElementCreator;
+
+
+/**
+ * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
+ */
+public class ChartServiceHelper {
+
+    private static final Logger logger =
+        Logger.getLogger(ChartServiceHelper.class);
+
+
+    /** The default chart width if no value is specified in the request.*/
+    public static final int DEFAULT_CHART_WIDTH  = 600;
+
+    /** The default chart height if no value is specified in the request.*/
+    public static final int DEFAULT_CHART_HEIGHT = 400;
+
+
+    private ChartServiceHelper() {
+    }
+
+    /**
+     * This method returns a document which might contain parameters to adjust
+     * chart settings. The document is created using the information that are
+     * contained in the request object.
+     *
+     * @param req The request document.
+     *
+     * @return a document to adjust chart settings.
+     */
+    protected static Document getChartAttributes(Map<String, String> req) {
+        logger.debug("ChartServiceHelper.getChartAttributes");
+
+        Document doc = XMLUtils.newDocument();
+
+        ElementCreator ec = new ElementCreator(
+            doc,
+            ArtifactNamespaceContext.NAMESPACE_URI,
+            ArtifactNamespaceContext.NAMESPACE_PREFIX);
+
+        Element attributes = ec.create("attributes");
+
+        appendChartSize(req, attributes, ec);
+        appendFormat(req, attributes, ec);
+        appendXRange(req, attributes, ec);
+        appendYRange(req, attributes, ec);
+        appendCurrentKm(req, attributes, ec);
+
+        doc.appendChild(attributes);
+
+        return doc;
+    }
+
+
+    /**
+     * This method extracts the size (width/height) of a chart from request
+     * object and append those values - if they exist - to the attribute
+     * document used to adjust chart settings.
+     *
+     * @param req The request object that might contain the chart size.
+     * @param attributes The attributes element used to adjust chart settings.
+     * @param ec The ElementCreator that might be used to create new Elements.
+     */
+    protected static void appendChartSize(
+        Map<String, String> req,
+        Element             attributes,
+        ElementCreator      ec)
+    {
+        logger.debug("ChartServiceHelper.appendChartSize");
+
+        Element size = ec.create("size");
+
+        String width  = req.get("width");
+        String height = req.get("height");
+
+        if (width == null || height == null) {
+            width  = String.valueOf(DEFAULT_CHART_WIDTH);
+            height = String.valueOf(DEFAULT_CHART_HEIGHT);
+        }
+
+        ec.addAttr(size, "width", width, true);
+        ec.addAttr(size, "height", height, true);
+
+        attributes.appendChild(size);
+    }
+
+
+    /**
+     * This method extracts the x range for the chart from request object and
+     * appends those range - if it exists - to the attribute document used to
+     * adjust the chart settings.
+     *
+     * @param req The request object that might contain the chart size.
+     * @param doc The attribute document used to adjust chart settings.
+     * @param ec The ElementCreator that might be used to create new Elements.
+     */
+    protected static void appendXRange(
+        Map<String, String> req,
+        Element             attributes,
+        ElementCreator      ec)
+    {
+        logger.debug("ChartServiceHelper.appendXRange");
+
+        Element range = ec.create("xrange");
+
+        String from = req.get("minx");
+        String to   = req.get("maxx");
+
+        if (from != null && to != null) {
+            ec.addAttr(range, "from", from, true);
+            ec.addAttr(range, "to", to, true);
+
+            attributes.appendChild(range);
+        }
+    }
+
+
+    /**
+     * This method extracts the x range for the chart from request object and
+     * appends those range - if it exists - to the attribute document used to
+     * adjust the chart settings.
+     *
+     * @param req The request object that might contain the chart size.
+     * @param doc The attribute document used to adjust chart settings.
+     * @param ec The ElementCreator that might be used to create new Elements.
+     */
+    protected static void appendYRange(
+        Map<String, String> req,
+        Element             attributes,
+        ElementCreator      ec)
+    {
+        logger.debug("ChartServiceHelper.appendYRange");
+
+        Element range = ec.create("yrange");
+
+        String from = req.get("miny");
+        String to   = req.get("maxy");
+
+        if (from != null && to != null) {
+            ec.addAttr(range, "from", from, true);
+            ec.addAttr(range, "to", to, true);
+
+            attributes.appendChild(range);
+        }
+    }
+
+
+    /**
+     * This method extracts the format string from request object and appends
+     * those format - if existing - to the attribute document used to adjust
+     * the chart settings.
+     *
+     * @param req The request object that might contain the chart format.
+     * @param doc The attribute document used to adjust chart settings.
+     * @param ec The ElementCreator that might be used to create new Elements.
+     */
+    protected static void appendFormat(
+        Map<String, String> req,
+        Element             attributes,
+        ElementCreator      ec
+
+    ) {
+        logger.debug("ChartServiceHelper.appendFormat");
+
+        String formatStr = req.get("format");
+        if (formatStr == null || formatStr.length() == 0) {
+            return;
+        }
+
+        Element format = ec.create("format");
+        ec.addAttr(format, "value", formatStr, true);
+
+        attributes.appendChild(format);
+    }
+
+
+    /**
+     * This method extracts the current km for the chart from request object and
+     * appends this km - if it exists - to the attribute document used to
+     * adjust the chart settings.
+     *
+     * @param req The request object that might contain the chart size.
+     * @param doc The attribute document used to adjust chart settings.
+     * @param ec The ElementCreator that might be used to create new Elements.
+     */
+    protected static void appendCurrentKm(
+        Map<String, String> req,
+        Element             attributes,
+        ElementCreator      ec)
+    {
+        logger.debug("ChartServiceHelper.appendCurrentKm");
+
+        Element currentKm = ec.create("currentKm");
+
+        String km = req.get("km");
+
+        if (km != null) {
+            ec.addAttr(currentKm, "km", km, true);
+
+            attributes.appendChild(currentKm);
+        }
+    }
+
+}
+// vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :