teichmann@5863: /* Copyright (C) 2011, 2012, 2013 by Bundesanstalt für Gewässerkunde
teichmann@5863:  * Software engineering by Intevation GmbH
teichmann@5863:  *
teichmann@5863:  * This file is Free Software under the GNU AGPL (>=v3) 
teichmann@5863:  * and comes with ABSOLUTELY NO WARRANTY! Check out the
teichmann@5863:  * documentation coming with Dive4Elements River for details. 
teichmann@5863:  */
teichmann@5863: 
teichmann@5831: package org.dive4elements.river.exports.fixings;
raimund@3088: 
teichmann@5831: import org.dive4elements.artifacts.ArtifactNamespaceContext;
teichmann@5831: import org.dive4elements.artifacts.CallContext;
teichmann@5831: import org.dive4elements.artifacts.common.utils.XMLUtils;
teichmann@5831: import org.dive4elements.river.exports.XYChartGenerator;
raimund@3088: 
raimund@3088: import java.io.OutputStream;
raimund@3088: 
christian@3406: import org.apache.log4j.Logger;
christian@3406: import org.w3c.dom.Document;
raimund@3088: 
ingo@3650: /**
ingo@3650:  * Base class for FixChartGenerator.
ingo@3650:  */
raimund@3088: public abstract class FixChartGenerator
raimund@3088: extends XYChartGenerator
raimund@3088: {
ingo@3650:     /** Private logger. */
raimund@3088:     private static Logger logger = Logger.getLogger(FixChartGenerator.class);
raimund@3088: 
sascha@3727:     public static final Double INVALID_KM = Double.valueOf(-1d);
christian@3406:     public static final String CURRENT_KM = "currentKm";
raimund@3088:     public static final String XPATH_CHART_CURRENTKM =
sascha@3221:         "/art:action/art:attributes/art:currentKm/@art:km";
raimund@3088: 
raimund@3088:     @Override
raimund@3088:     public void init(Document request, OutputStream out, CallContext context) {
raimund@3088:         super.init(request, out, context);
raimund@3088: 
sascha@3727:         Double currentKm = getCurrentKmFromRequest(request);
sascha@3221: 
sascha@3221:         if (logger.isDebugEnabled()) {
sascha@3221:             logger.debug("currentKm = " + currentKm);
sascha@3221:         }
sascha@3221: 
bjoern@4437:         if (currentKm != INVALID_KM) {
bjoern@4437:             context.putContextValue(CURRENT_KM, currentKm);
bjoern@4437:         }
raimund@3088:     }
raimund@3088: 
sascha@3727:     public static final Double getCurrentKmFromRequest(Document request) {
sascha@3221: 
sascha@3221:         String km = XMLUtils.xpathString(
raimund@3088:             request,
raimund@3088:             XPATH_CHART_CURRENTKM,
raimund@3088:             ArtifactNamespaceContext.INSTANCE);
raimund@3088: 
raimund@3088:         if (km == null) {
sascha@3221:             return INVALID_KM;
raimund@3088:         }
raimund@3088: 
raimund@3088:         try {
sascha@3221:             return Double.valueOf(km);
raimund@3088:         }
sascha@3221:         catch (NumberFormatException nfe) {
sascha@3221:             return INVALID_KM;
raimund@3088:         }
raimund@3088:     }
raimund@3088: }
sascha@3221: // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :