Mercurial > dive4elements > river
comparison 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> |
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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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5837:d9901a08d0a6 | 5838:5aa05a7a34b7 |
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1 package org.dive4elements.river.client.server; | |
2 | |
3 import java.io.IOException; | |
4 import java.io.InputStream; | |
5 import java.io.OutputStream; | |
6 | |
7 import javax.servlet.http.HttpServlet; | |
8 import javax.servlet.http.HttpServletRequest; | |
9 import javax.servlet.http.HttpServletResponse; | |
10 | |
11 import org.apache.log4j.Logger; | |
12 import org.w3c.dom.Document; | |
13 import org.w3c.dom.Element; | |
14 import org.w3c.dom.NodeList; | |
15 | |
16 import org.dive4elements.artifacts.common.utils.XMLUtils; | |
17 import org.dive4elements.artifacts.httpclient.exceptions.ConnectionException; | |
18 import org.dive4elements.artifacts.httpclient.http.HttpClient; | |
19 import org.dive4elements.artifacts.httpclient.http.HttpClientImpl; | |
20 import org.dive4elements.artifacts.httpclient.http.response.StreamResponseHandler; | |
21 | |
22 public class BedloadKMChartServiceImpl extends HttpServlet { | |
23 private static final Logger log = | |
24 Logger.getLogger(FixingsKMChartServiceImpl.class); | |
25 | |
26 public static final String SERVICE_NAME = "bedload-km-chart"; | |
27 | |
28 public BedloadKMChartServiceImpl() { | |
29 } | |
30 | |
31 public void doGet(HttpServletRequest req, HttpServletResponse resp) { | |
32 | |
33 log.info("BedloadKMChartServiceImpl.doGet"); | |
34 | |
35 String url = getServletContext().getInitParameter("server-url"); | |
36 String locale = req.getParameter("locale"); | |
37 String filter = req.getParameter("filter"); | |
38 | |
39 if (filter == null || filter.length() == 0) { | |
40 log.warn("Missing 'filter' parameter."); | |
41 return; | |
42 } | |
43 | |
44 if (locale == null || locale.length() == 0) { | |
45 locale = "de"; | |
46 } | |
47 | |
48 Document filterDoc = XMLUtils.jsonToXML(filter); | |
49 | |
50 if (filterDoc == null) { | |
51 log.warn("Creating filter document failed."); | |
52 return; | |
53 } | |
54 | |
55 InputStream in; | |
56 | |
57 try { | |
58 HttpClient client = new HttpClientImpl(url, locale); | |
59 in = (InputStream)client.callService( | |
60 url, // XXX: Why? The URL is passed by construction already. | |
61 SERVICE_NAME, | |
62 filterDoc, | |
63 new StreamResponseHandler()); | |
64 } | |
65 catch (ConnectionException ce) { | |
66 log.error(ce); | |
67 return; | |
68 } | |
69 | |
70 resp.setHeader("Content-Type", guessMIMEType(filterDoc)); | |
71 | |
72 try { | |
73 OutputStream out = resp.getOutputStream(); | |
74 | |
75 byte [] buf = new byte[4096]; | |
76 int i = -1; | |
77 while ((i = in.read(buf)) >= 0) { | |
78 out.write(buf, 0, i); | |
79 } | |
80 out.flush(); | |
81 } | |
82 catch (IOException ioe) { | |
83 log.error(ioe); | |
84 } | |
85 finally { | |
86 try { in.close(); } | |
87 catch (IOException ioe) { /* ignored */ } | |
88 } | |
89 } | |
90 | |
91 protected static String guessMIMEType(Document document) { | |
92 | |
93 NodeList formats = document.getElementsByTagName("format"); | |
94 | |
95 String format = "png"; | |
96 | |
97 if (formats.getLength() > 0) { | |
98 String type = ((Element)formats.item(0)).getAttribute("type"); | |
99 if (type.length() > 0) { | |
100 format = type; | |
101 } | |
102 } | |
103 | |
104 return "image/" + format; | |
105 } | |
106 } |