Mercurial > dive4elements > river
comparison flys-client/src/main/java/de/intevation/flys/client/server/SQKMChartServiceImpl.java @ 2953:75e9eab05ee4
Added overview chart to sq relation period input panel.
flys-client/trunk@4932 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author | Raimund Renkert <raimund.renkert@intevation.de> |
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date | Wed, 11 Jul 2012 11:24:27 +0000 |
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2952:3cacd42a0336 | 2953:75e9eab05ee4 |
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1 package de.intevation.flys.client.server; | |
2 | |
3 import org.apache.log4j.Logger; | |
4 | |
5 import java.io.IOException; | |
6 import java.io.InputStream; | |
7 import java.io.OutputStream; | |
8 | |
9 import javax.servlet.http.HttpServlet; | |
10 import javax.servlet.http.HttpServletRequest; | |
11 import javax.servlet.http.HttpServletResponse; | |
12 | |
13 import org.w3c.dom.Document; | |
14 import org.w3c.dom.Element; | |
15 import org.w3c.dom.NodeList; | |
16 | |
17 import de.intevation.artifacts.common.utils.XMLUtils; | |
18 | |
19 import de.intevation.artifacts.httpclient.exceptions.ConnectionException; | |
20 import de.intevation.artifacts.httpclient.http.HttpClient; | |
21 import de.intevation.artifacts.httpclient.http.HttpClientImpl; | |
22 | |
23 import de.intevation.artifacts.httpclient.http.response.StreamResponseHandler; | |
24 | |
25 public class SQKMChartServiceImpl | |
26 extends HttpServlet | |
27 { | |
28 private static final Logger log = | |
29 Logger.getLogger(FixingsKMChartServiceImpl.class); | |
30 | |
31 public static final String SERVICE_NAME = "sq-km-chart"; | |
32 | |
33 public SQKMChartServiceImpl() { | |
34 } | |
35 | |
36 public void doGet(HttpServletRequest req, HttpServletResponse resp) { | |
37 | |
38 log.info("SQKMChartServiceImpl.doGet"); | |
39 | |
40 String url = getServletContext().getInitParameter("server-url"); | |
41 String locale = req.getParameter("locale"); | |
42 String filter = req.getParameter("filter"); | |
43 | |
44 if (filter == null || filter.length() == 0) { | |
45 log.warn("Missing 'filter' parameter."); | |
46 return; | |
47 } | |
48 | |
49 if (locale == null || locale.length() == 0) { | |
50 locale = "de"; | |
51 } | |
52 | |
53 Document filterDoc = XMLUtils.jsonToXML(filter); | |
54 | |
55 if (filterDoc == null) { | |
56 log.warn("Creating filter document failed."); | |
57 return; | |
58 } | |
59 | |
60 InputStream in; | |
61 | |
62 try { | |
63 HttpClient client = new HttpClientImpl(url, locale); | |
64 in = (InputStream)client.callService( | |
65 url, // XXX: Why? The URL is passed by construction already. | |
66 SERVICE_NAME, | |
67 filterDoc, | |
68 new StreamResponseHandler()); | |
69 } | |
70 catch (ConnectionException ce) { | |
71 log.error(ce); | |
72 return; | |
73 } | |
74 | |
75 resp.setHeader("Content-Type", guessMIMEType(filterDoc)); | |
76 | |
77 try { | |
78 OutputStream out = resp.getOutputStream(); | |
79 | |
80 byte [] buf = new byte[4096]; | |
81 int i = -1; | |
82 while ((i = in.read(buf)) >= 0) { | |
83 out.write(buf, 0, i); | |
84 } | |
85 out.flush(); | |
86 } | |
87 catch (IOException ioe) { | |
88 log.error(ioe); | |
89 } | |
90 finally { | |
91 try { in.close(); } | |
92 catch (IOException ioe) { /* ignored */ } | |
93 } | |
94 } | |
95 | |
96 protected static String guessMIMEType(Document document) { | |
97 | |
98 NodeList formats = document.getElementsByTagName("format"); | |
99 | |
100 String format = "png"; | |
101 | |
102 if (formats.getLength() > 0) { | |
103 String type = ((Element)formats.item(0)).getAttribute("type"); | |
104 if (type.length() > 0) { | |
105 format = type; | |
106 } | |
107 } | |
108 | |
109 return "image/" + format; | |
110 } | |
111 } |