Mercurial > dive4elements > river
comparison flys-client/src/main/java/de/intevation/flys/client/server/FixingsKMChartServiceImpl.java @ 2488:88d44cae592e
Added new proxy servlet to bridge the fixing km chart requests to the artefact server.
flys-client/trunk@4275 c6561f87-3c4e-4783-a992-168aeb5c3f6f
| author | Sascha L. Teichmann <sascha.teichmann@intevation.de> |
|---|---|
| date | Thu, 19 Apr 2012 11:00:18 +0000 |
| parents | |
| children | f905c936ffff |
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| 2487:75d11997921c | 2488:88d44cae592e |
|---|---|
| 1 package de.intevation.flys.client.server; | |
| 2 | |
| 3 import de.intevation.artifacts.common.utils.XMLUtils; | |
| 4 | |
| 5 import de.intevation.artifacts.httpclient.http.HttpClient; | |
| 6 import de.intevation.artifacts.httpclient.http.HttpClientImpl; | |
| 7 | |
| 8 import de.intevation.artifacts.httpclient.exceptions.ConnectionException; | |
| 9 | |
| 10 import de.intevation.artifacts.httpclient.http.response.StreamResponseHandler; | |
| 11 | |
| 12 import java.io.IOException; | |
| 13 import java.io.InputStream; | |
| 14 import java.io.OutputStream; | |
| 15 | |
| 16 import javax.servlet.http.HttpServlet; | |
| 17 import javax.servlet.http.HttpServletRequest; | |
| 18 import javax.servlet.http.HttpServletResponse; | |
| 19 | |
| 20 import org.apache.log4j.Logger; | |
| 21 | |
| 22 import org.w3c.dom.Document; | |
| 23 import org.w3c.dom.Element; | |
| 24 import org.w3c.dom.NodeList; | |
| 25 | |
| 26 public class FixingsKMChartServiceImpl | |
| 27 extends HttpServlet | |
| 28 { | |
| 29 private static final Logger log = | |
| 30 Logger.getLogger(FixingsKMChartServiceImpl.class); | |
| 31 | |
| 32 public static final String SERVICE_NAME = "fixings-km-chart"; | |
| 33 | |
| 34 public FixingsKMChartServiceImpl() { | |
| 35 } | |
| 36 | |
| 37 public void doGet(HttpServletRequest req, HttpServletResponse resp) { | |
| 38 | |
| 39 log.info("FixingsKMChartServiceImpl.doGet"); | |
| 40 | |
| 41 String url = getServletContext().getInitParameter("server-url"); | |
| 42 String locale = req.getParameter("locale"); | |
| 43 String filter = req.getParameter("filter"); | |
| 44 | |
| 45 if (filter == null || filter.length() == 0) { | |
| 46 log.warn("Missing 'filter' parameter."); | |
| 47 return; | |
| 48 } | |
| 49 | |
| 50 if (locale == null || locale.length() == 0) { | |
| 51 locale = "de"; | |
| 52 } | |
| 53 | |
| 54 Document filterDoc = XMLUtils.jsonToXML(filter); | |
| 55 | |
| 56 if (filterDoc == null) { | |
| 57 log.warn("Creating filter document failed."); | |
| 58 return; | |
| 59 } | |
| 60 | |
| 61 HttpClient client; | |
| 62 | |
| 63 client = new HttpClientImpl(url, locale); | |
| 64 | |
| 65 resp.setHeader("Content-Type", guessMIMEType(filterDoc)); | |
| 66 | |
| 67 InputStream in; | |
| 68 | |
| 69 try { | |
| 70 in = (InputStream)client.callService( | |
| 71 url, // XXX: Why? The URL is passed by construction already. | |
| 72 SERVICE_NAME, | |
| 73 filterDoc, | |
| 74 new StreamResponseHandler()); | |
| 75 } | |
| 76 catch (ConnectionException ce) { | |
| 77 log.error(ce); | |
| 78 return; | |
| 79 } | |
| 80 | |
| 81 try { | |
| 82 OutputStream out = resp.getOutputStream(); | |
| 83 | |
| 84 byte [] buf = new byte[4096]; | |
| 85 int i = -1; | |
| 86 while ((i = in.read(buf)) >= 0) { | |
| 87 out.write(buf, 0, i); | |
| 88 } | |
| 89 out.flush(); | |
| 90 } | |
| 91 catch (IOException ioe) { | |
| 92 log.error(ioe); | |
| 93 } | |
| 94 finally { | |
| 95 try { in.close(); } | |
| 96 catch (IOException ioe) { /* ignored */ } | |
| 97 } | |
| 98 } | |
| 99 | |
| 100 protected static String guessMIMEType(Document document) { | |
| 101 | |
| 102 NodeList formats = document.getElementsByTagName("format"); | |
| 103 | |
| 104 String format = "png"; | |
| 105 | |
| 106 if (formats.getLength() > 0) { | |
| 107 String type = ((Element)formats.item(0)).getAttribute("type"); | |
| 108 if (type.length() > 0) { | |
| 109 format = type; | |
| 110 } | |
| 111 } | |
| 112 | |
| 113 return "image/" + format; | |
| 114 } | |
| 115 } | |
| 116 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 : |