view flys-client/src/main/java/de/intevation/flys/client/server/ChartOutputServiceImpl.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>
date Wed, 24 Oct 2012 14:34:35 +0200
parents 2867a0192aed
children
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package de.intevation.flys.client.server;

import java.io.OutputStream;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;

import org.w3c.dom.Document;

import org.apache.log4j.Logger;

import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import de.intevation.artifacts.common.utils.ClientProtocolUtils;

import de.intevation.artifacts.httpclient.http.HttpClient;
import de.intevation.artifacts.httpclient.http.HttpClientImpl;


/**
 * This service is used to request a chart from the artifact server. The
 * response is directed directly to the output stream, so the image that is
 * retrieved is displayed in the UI afterwards.
 *
 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
 */
public class ChartOutputServiceImpl
extends      HttpServlet
{
    private static final Logger logger =
        Logger.getLogger(ChartOutputServiceImpl.class);


    public void doGet(HttpServletRequest req, HttpServletResponse resp) {
        logger.info("ChartOutputServiceImpl.doGet");

        try {
            OutputStream out = resp.getOutputStream();

            String url = getServletContext().getInitParameter("server-url");

            String uuid   = req.getParameter("uuid");
            String type   = req.getParameter("type");
            String locale = req.getParameter("locale");

            prepareHeader(req, resp);

            Document request = ClientProtocolUtils.newOutCollectionDocument(
                uuid, type, type,
                ChartServiceHelper.getChartAttributes(prepareChartAttributes(req)));

            HttpClient client = new HttpClientImpl(url, locale);
            client.collectionOut(request, uuid, "chart", out);

            out.close();
            out.flush();
        }
        catch (IOException ioe) {
            logger.error(ioe, ioe);
        }
        catch (Exception e) {
            logger.error(e, e);
        }
    }


    protected Map<String, String> prepareChartAttributes(HttpServletRequest req) {
        Map<String, String> attr = new HashMap<String, String>();

        Map params = req.getParameterMap();

        attr.put("width", req.getParameter("width"));
        attr.put("height", req.getParameter("height"));
        attr.put("minx", req.getParameter("minx"));
        attr.put("maxx", req.getParameter("maxx"));
        attr.put("miny", req.getParameter("miny"));
        attr.put("maxy", req.getParameter("maxy"));
        attr.put("format", req.getParameter("format"));
        attr.put("km", req.getParameter("currentKm"));

        if (logger.isDebugEnabled()) {
            logger.debug("====== ZOOM VALUES =======");
            logger.debug("  min x: " + req.getParameter("minx"));
            logger.debug("  max x: " + req.getParameter("maxx"));
            logger.debug("  min y: " + req.getParameter("miny"));
            logger.debug("  max y: " + req.getParameter("maxy"));
        }

        return attr;
    }


    protected void prepareHeader(
        HttpServletRequest  req,
        HttpServletResponse resp
    ) {
        String export = req.getParameter("export");

        if (export != null && export.equals("true")) {
            String format = req.getParameter("format");

            if (format == null || format.length() == 0) {
                format = "png";
            }

            String fn = "chart_export" + getFileExtension(format);

            resp.setHeader("Content-Disposition", "attachment;filename=" + fn);
            resp.setHeader("Content-Type", getMimeType(format));
        }
    }


    protected String getFileExtension(String format) {
        if (format.equals("png")) {
            return ".png";
        }
        else if (format.equals("pdf")) {
            return ".pdf";
        }
        else if (format.equals("svg")) {
            return ".svg";
        }
        else if (format.equals("csv")) {
            return ".csv";
        }

        return ".png";
    }


    protected String getMimeType(String format) {
        if (format.equals("png")) {
            return "image/png";
        }
        else if (format.equals("pdf")) {
            return "application/pdf";
        }
        else if (format.equals("svg")) {
            return "svg+xml";
        }
        else if (format.equals("csv")) {
            return "text/plain";
        }

        return "image/png";
    }
}
// vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :

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