Mercurial > dive4elements > river
diff gwt-client/src/main/java/org/dive4elements/river/client/server/BedloadKMChartServiceImpl.java @ 5838:5aa05a7a34b7
Rename modules to more fitting names.
author | Sascha L. Teichmann <teichmann@intevation.de> |
---|---|
date | Thu, 25 Apr 2013 15:23:37 +0200 |
parents | flys-client/src/main/java/org/dive4elements/river/client/server/BedloadKMChartServiceImpl.java@821a02bbfb4e |
children | 172338b1407f |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/gwt-client/src/main/java/org/dive4elements/river/client/server/BedloadKMChartServiceImpl.java Thu Apr 25 15:23:37 2013 +0200 @@ -0,0 +1,106 @@ +package org.dive4elements.river.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 org.dive4elements.artifacts.common.utils.XMLUtils; +import org.dive4elements.artifacts.httpclient.exceptions.ConnectionException; +import org.dive4elements.artifacts.httpclient.http.HttpClient; +import org.dive4elements.artifacts.httpclient.http.HttpClientImpl; +import org.dive4elements.artifacts.httpclient.http.response.StreamResponseHandler; + +public class BedloadKMChartServiceImpl extends HttpServlet { + private static final Logger log = + Logger.getLogger(FixingsKMChartServiceImpl.class); + + public static final String SERVICE_NAME = "bedload-km-chart"; + + public BedloadKMChartServiceImpl() { + } + + public void doGet(HttpServletRequest req, HttpServletResponse resp) { + + log.info("BedloadKMChartServiceImpl.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; + } +}