Mercurial > dive4elements > river
diff flys-client/src/main/java/de/intevation/flys/client/server/DischargeTablesServiceImpl.java @ 4218:6ae99d996f79
flys/issue903: Display the discharge tables of the selected gauge as chart in historical discharge calculation.
There is a new class 'DischargeTablesChart' which is a Canvas and displays the chart using the new service
'DischargeTablesServiceImpl'.
author | Ingo Weinzierl <ingo.weinzierl@intevation.de> |
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date | Tue, 23 Oct 2012 12:01:19 +0200 |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/flys-client/src/main/java/de/intevation/flys/client/server/DischargeTablesServiceImpl.java Tue Oct 23 12:01:19 2012 +0200 @@ -0,0 +1,143 @@ +package de.intevation.flys.client.server; + +import java.io.IOException; +import java.io.InputStream; +import java.io.OutputStream; +import java.text.DateFormat; +import java.util.Date; +import java.util.Locale; + +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 de.intevation.artifacts.common.utils.XMLUtils; +import de.intevation.artifacts.httpclient.http.HttpClient; +import de.intevation.artifacts.httpclient.http.HttpClientImpl; +import de.intevation.artifacts.httpclient.http.response.StreamResponseHandler; + + +public class DischargeTablesServiceImpl extends HttpServlet { + + private static final Logger logger = Logger + .getLogger(DischargeInfoServiceImpl.class); + + private static final DateFormat DATE_FORMAT = DateFormat.getDateInstance( + DateFormat.MEDIUM, Locale.GERMANY); + + public void doGet(HttpServletRequest req, HttpServletResponse resp) { + logger.info("ChartOutputServiceImpl.doGet"); + + String url = getServletContext().getInitParameter("server-url"); + String locale = req.getParameter("locale"); + + prepareHeader(req, resp); + + Document requestDoc = createRequestDoc(req); + + HttpClient client = new HttpClientImpl(url, locale); + + try { + OutputStream out = resp.getOutputStream(); + InputStream stream = (InputStream) client.callService(url, + "dischargetablesoverview", requestDoc, + new StreamResponseHandler()); + + byte[] b = new byte[4096]; + try { + int i; + while ((i = stream.read(b)) >= 0) { + out.write(b, 0, i); + } + } + finally { + stream.close(); + } + } + catch (IOException ioe) { + logger.error("Error while fetching discharge tables chart!", ioe); + } + } + + protected void prepareHeader(HttpServletRequest req, + HttpServletResponse resp) { + resp.setHeader("Content-Type", "image/png"); + } + + protected Document createRequestDoc(HttpServletRequest req) { + Document request = XMLUtils.newDocument(); + XMLUtils.ElementCreator creator = new XMLUtils.ElementCreator(request, + null, null); + + Element service = creator.create("service"); + Element gauge = creator.create("gauge"); + Element extent = creator.create("extent"); + Element format = creator.create("format"); + Element timerange = creator.create("timerange"); + + creator.addAttr(gauge, "name", extractRequestGauge(req)); + creator.addAttr(extent, "width", extractRequestWidth(req)); + creator.addAttr(extent, "height", extractRequestHeight(req)); + creator.addAttr(format, "type", extractRequestFormat(req)); + creator.addAttr(timerange, "lower", extractRequestLowerTime(req)); + creator.addAttr(timerange, "upper", extractRequestUpperTime(req)); + + request.appendChild(service); + service.appendChild(gauge); + service.appendChild(extent); + service.appendChild(format); + service.appendChild(timerange); + + return request; + } + + protected String extractRequestGauge(HttpServletRequest req) { + return req.getParameter("gauge"); + } + + protected String extractRequestWidth(HttpServletRequest req) { + return req.getParameter("width"); + } + + protected String extractRequestHeight(HttpServletRequest req) { + return req.getParameter("height"); + } + + protected String extractRequestFormat(HttpServletRequest req) { + return req.getParameter("format"); + } + + protected String extractRequestLowerTime(HttpServletRequest req) { + String lowerStr = req.getParameter("lower"); + try { + long lowerMillis = Long.parseLong(lowerStr); + Date lower = new Date(lowerMillis); + + return DATE_FORMAT.format(lower); + } + catch (NumberFormatException nfe) { + logger.warn("Cannot parse time millies.", nfe); + } + + return null; + } + + protected String extractRequestUpperTime(HttpServletRequest req) { + String upperStr = req.getParameter("upper"); + try { + long upperMillis = Long.parseLong(upperStr); + Date upper = new Date(upperMillis); + + return DATE_FORMAT.format(upper); + } + catch (NumberFormatException nfe) { + logger.warn("Cannot parse time millies.", nfe); + } + + return null; + } +}