Mercurial > dive4elements > river
view flys-client/src/main/java/de/intevation/flys/client/server/BedKMChartServiceImpl.java @ 4241:49cb65d5932d
Improved the historical discharge calculation.
The calculation now creates new HistoricalWQKms (new subclass of WQKms). Those WQKms are used
to create new facets from (new) type 'HistoricalDischargeCurveFacet'. The chart generator is
improved to support those facets.
author | Ingo Weinzierl <ingo.weinzierl@intevation.de> |
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date | Wed, 24 Oct 2012 14:34:35 +0200 |
parents | f84ed73311f2 |
children |
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package de.intevation.flys.client.server; import java.io.IOException; import java.io.InputStream; import java.io.OutputStream; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import org.apache.log4j.Logger; import org.w3c.dom.Document; import org.w3c.dom.Element; import org.w3c.dom.NodeList; import de.intevation.artifacts.common.utils.XMLUtils; import de.intevation.artifacts.httpclient.exceptions.ConnectionException; import de.intevation.artifacts.httpclient.http.HttpClient; import de.intevation.artifacts.httpclient.http.HttpClientImpl; import de.intevation.artifacts.httpclient.http.response.StreamResponseHandler; public class BedKMChartServiceImpl extends HttpServlet { private static final Logger log = Logger.getLogger(FixingsKMChartServiceImpl.class); public static final String SERVICE_NAME = "bed-km-chart"; public BedKMChartServiceImpl() { } public void doGet(HttpServletRequest req, HttpServletResponse resp) { log.info("BedKMChartServiceImpl.doGet"); String url = getServletContext().getInitParameter("server-url"); String locale = req.getParameter("locale"); String filter = req.getParameter("filter"); if (filter == null || filter.length() == 0) { log.warn("Missing 'filter' parameter."); return; } if (locale == null || locale.length() == 0) { locale = "de"; } Document filterDoc = XMLUtils.jsonToXML(filter); if (filterDoc == null) { log.warn("Creating filter document failed."); return; } InputStream in; try { HttpClient client = new HttpClientImpl(url, locale); in = (InputStream)client.callService( url, // XXX: Why? The URL is passed by construction already. SERVICE_NAME, filterDoc, new StreamResponseHandler()); } catch (ConnectionException ce) { log.error(ce); return; } resp.setHeader("Content-Type", guessMIMEType(filterDoc)); try { OutputStream out = resp.getOutputStream(); byte [] buf = new byte[4096]; int i = -1; while ((i = in.read(buf)) >= 0) { out.write(buf, 0, i); } out.flush(); } catch (IOException ioe) { log.error(ioe); } finally { try { in.close(); } catch (IOException ioe) { /* ignored */ } } } protected static String guessMIMEType(Document document) { NodeList formats = document.getElementsByTagName("format"); String format = "png"; if (formats.getLength() > 0) { String type = ((Element)formats.item(0)).getAttribute("type"); if (type.length() > 0) { format = type; } } return "image/" + format; } }