Mercurial > dive4elements > river

comparison gwt-client/src/main/java/org/dive4elements/river/client/server/DistanceInfoServiceImpl.java @ 5838:5aa05a7a34b7

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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/DistanceInfoServiceImpl.java@821a02bbfb4e
children 172338b1407f
comparison
equal deleted inserted replaced
5837:d9901a08d0a6 5838:5aa05a7a34b7
1 package org.dive4elements.river.client.server;
2
3 import java.util.ArrayList;
4 import java.util.List;
5
6 import org.w3c.dom.Document;
7 import org.w3c.dom.Element;
8 import org.w3c.dom.NodeList;
9
10 import org.apache.log4j.Logger;
11
12 import com.google.gwt.user.server.rpc.RemoteServiceServlet;
13
14 import org.dive4elements.artifacts.common.ArtifactNamespaceContext;
15 import org.dive4elements.artifacts.common.utils.XMLUtils;
16
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
21 import org.dive4elements.river.client.shared.exceptions.ServerException;
22 import org.dive4elements.river.client.client.services.DistanceInfoService;
23 import org.dive4elements.river.client.shared.model.DistanceInfoObject;
24 import org.dive4elements.river.client.shared.model.DistanceInfoObjectImpl;
25
26
27 /**
28 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
29 */
30 public class DistanceInfoServiceImpl
31 extends RemoteServiceServlet
32 implements DistanceInfoService
33 {
34 private static final Logger logger =
35 Logger.getLogger(DistanceInfoServiceImpl.class);
36
37 public static final String ERROR_NO_DISTANCEINFO_FOUND =
38 "error_no_distanceinfo_found";
39
40 public static final String XPATH_DISTANCES = "art:distances/art:distance";
41
42
43 public DistanceInfoObject[] getDistanceInfo(
44 String locale,
45 String river)
46 throws ServerException
47 {
48 logger.info("DistanceInfoServiceImpl.getDistanceInfo");
49
50 String url = getServletContext().getInitParameter("server-url");
51
52 Document doc = XMLUtils.newDocument();
53
54 XMLUtils.ElementCreator ec = new XMLUtils.ElementCreator(
55 doc,
56 ArtifactNamespaceContext.NAMESPACE_URI,
57 ArtifactNamespaceContext.NAMESPACE_PREFIX);
58
59 Element riverEl = ec.create("river");
60
61 riverEl.setTextContent(river);
62
63 doc.appendChild(riverEl);
64
65 HttpClient client = new HttpClientImpl(url, locale);
66
67 try {
68 Document result = client.callService(url, "distanceinfo", doc);
69
70 logger.debug("Extract distance info objects now.");
71 DistanceInfoObject[] objects = extractDistanceInfoObjects(result);
72
73 if (objects != null && objects.length > 0) {
74 return objects;
75 }
76 }
77 catch (ConnectionException ce) {
78 logger.error(ce, ce);
79 }
80
81 throw new ServerException(ERROR_NO_DISTANCEINFO_FOUND);
82 }
83
84
85 /**
86 * Extracts all distance info objects from <i>result</i> document.
87 *
88 * @param result The document retrieved by the server.
89 *
90 * @return a list of DistanceInfoObjects.
91 */
92 protected DistanceInfoObject[] extractDistanceInfoObjects(Document result)
93 throws ServerException
94 {
95 NodeList list = result.getElementsByTagName("distance");
96
97 if (list == null || list.getLength() == 0) {
98 logger.warn("No distance info found.");
99 throw new ServerException(ERROR_NO_DISTANCEINFO_FOUND);
100 }
101
102 int num = list.getLength();
103 logger.debug("Response contains " + num + " objects.");
104
105 List<DistanceInfoObject> objects =
106 new ArrayList<DistanceInfoObject>(num);
107
108 for (int i = 0; i < num; i++) {
109 DistanceInfoObject obj = buildDistanceInfoObject(
110 (Element)list.item(i));
111
112 if (obj != null) {
113 objects.add(obj);
114 }
115 }
116
117 logger.debug("Retrieved " + objects.size() + " distances.");
118
119 return (DistanceInfoObject[])
120 objects.toArray(new DistanceInfoObject[num]);
121 }
122
123
124 /**
125 * Extracts information for a single distance info object and intializes an
126 * DistanceInfoObject with them.
127 *
128 * @param node The node that contains the information.
129 *
130 * @return a valid DistanceInfoObject.
131 */
132 protected DistanceInfoObject buildDistanceInfoObject(Element node) {
133
134 String desc = node.getAttribute("description").trim();
135 String from = node.getAttribute("from").trim();
136 String to = node.getAttribute("to").trim();
137 String riverside = node.getAttribute("riverside").trim();
138 String bottom = node.getAttribute("bottom").trim();
139 String top = node.getAttribute("top").trim();
140
141 if (desc.length() > 0 && from.length() > 0) {
142 try {
143 Double f = new Double(from);
144 Double t = to .length() > 0 ? new Double(to) : null;
145 Double b = bottom.length() > 0 ? new Double(bottom) : null;
146 Double tp = top .length() > 0 ? new Double(top) : null;
147
148 return new DistanceInfoObjectImpl(desc, f, t, riverside, b, tp);
149 }
150 catch (NumberFormatException nfe) {
151 logger.warn(nfe.getLocalizedMessage());
152 }
153 }
154
155 logger.warn("Invalid distance info object found.");
156
157 return null;
158 }
159 }
160 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
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