Mercurial > dive4elements > river

comparison gwt-client/src/main/java/org/dive4elements/river/client/server/ChartInfoServiceImpl.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/ChartInfoServiceImpl.java@821a02bbfb4e
children 172338b1407f
comparison
equal deleted inserted replaced
5837:d9901a08d0a6 5838:5aa05a7a34b7
1 package org.dive4elements.river.client.server;
2
3 import java.io.InputStream;
4 import java.io.IOException;
5 import java.util.ArrayList;
6 import java.util.Date;
7 import java.util.List;
8 import java.util.Map;
9
10 import javax.xml.xpath.XPathConstants;
11
12 import org.w3c.dom.Document;
13 import org.w3c.dom.Element;
14 import org.w3c.dom.NodeList;
15
16 import org.apache.log4j.Logger;
17
18 import com.google.gwt.user.server.rpc.RemoteServiceServlet;
19
20 import org.dive4elements.artifacts.common.ArtifactNamespaceContext;
21 import org.dive4elements.artifacts.common.utils.ClientProtocolUtils;
22 import org.dive4elements.artifacts.common.utils.XMLUtils;
23
24 import org.dive4elements.artifacts.httpclient.http.HttpClient;
25 import org.dive4elements.artifacts.httpclient.http.HttpClientImpl;
26
27 import org.dive4elements.river.client.shared.Transform2D;
28 import org.dive4elements.river.client.shared.exceptions.ServerException;
29 import org.dive4elements.river.client.shared.model.Axis;
30 import org.dive4elements.river.client.shared.model.DateAxis;
31 import org.dive4elements.river.client.shared.model.NumberAxis;
32 import org.dive4elements.river.client.shared.model.ChartInfo;
33 import org.dive4elements.river.client.shared.model.Collection;
34
35 import org.dive4elements.river.client.client.services.ChartInfoService;
36
37
38 /**
39 * This service fetches a document that contains meta information for a specific
40 * chart.
41 *
42 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
43 */
44 public class ChartInfoServiceImpl
45 extends RemoteServiceServlet
46 implements ChartInfoService
47 {
48 private static final Logger logger =
49 Logger.getLogger(ChartInfoServiceImpl.class);
50
51 public static final String XPATH_TRANSFORM_MATRIX =
52 "/art:chartinfo/art:transformation-matrix/art:matrix";
53
54 public static final String XPATH_X_AXES =
55 "/art:chartinfo/art:axes/art:domain";
56
57 public static final String XPATH_Y_AXES =
58 "/art:chartinfo/art:axes/art:range";
59
60 public static final String EXCEPTION_STRING = "error_chart_info_service";
61
62
63 public ChartInfo getChartInfo(
64 Collection collection,
65 String locale,
66 String type,
67 Map<String, String> attr)
68 throws ServerException
69 {
70 logger.info("ChartInfoServiceImpl.getChartInfo");
71
72 String url = getServletContext().getInitParameter("server-url");
73
74 Document request = ClientProtocolUtils.newOutCollectionDocument(
75 collection.identifier(),
76 type,
77 type,
78 ChartServiceHelper.getChartAttributes(attr));
79
80 try {
81 HttpClient client = new HttpClientImpl(url, locale);
82 InputStream in = client.collectionOut(
83 request,
84 collection.identifier(),
85 type + "_chartinfo");
86
87 Document info = XMLUtils.parseDocument(in);
88
89 return parseInfoDocument(info);
90 }
91 catch (IOException ioe) {
92 ioe.printStackTrace();
93 }
94 catch (Exception e) {
95 e.printStackTrace();
96 }
97
98 logger.debug("Error while fetching chart info.");
99
100 throw new ServerException(EXCEPTION_STRING);
101 }
102
103
104 /**
105 * Parse ChartInfo-Part of document, create Transforms and axes
106 * from it.
107 */
108 protected ChartInfo parseInfoDocument(Document doc) {
109 Transform2D[] transformer = parseTransformationMatrix(doc);
110 Axis[] xAxes = parseXAxes(doc);
111 Axis[] yAxes = parseYAxes(doc);
112
113 return new ChartInfo(xAxes, yAxes, transformer);
114 }
115
116
117 protected Axis[] parseXAxes(Document doc) {
118 logger.debug("ChartInfoServiceImpl.parseXAxes");
119
120 NodeList axes = (NodeList) XMLUtils.xpath(
121 doc,
122 XPATH_X_AXES,
123 XPathConstants.NODESET,
124 ArtifactNamespaceContext.INSTANCE);
125
126 return parseAxes(axes);
127 }
128
129
130 protected Axis[] parseYAxes(Document doc) {
131 logger.debug("ChartInfoServiceImpl.parseYAxes");
132
133 NodeList axes = (NodeList) XMLUtils.xpath(
134 doc,
135 XPATH_Y_AXES,
136 XPathConstants.NODESET,
137 ArtifactNamespaceContext.INSTANCE);
138
139 return parseAxes(axes);
140 }
141
142
143 protected Axis[] parseAxes(NodeList axes) {
144 logger.debug("ChartInfoServiceImpl.parseAxes");
145
146 int count = axes != null ? axes.getLength() : 0;
147
148 logger.debug("Chart has " + count + " axes.");
149
150 if (count == 0) {
151 return null;
152 }
153
154 Axis[] result = new Axis[count];
155
156 String ns = ArtifactNamespaceContext.NAMESPACE_URI;
157
158 for (int i = 0; i < count; i++) {
159 Element node = (Element) axes.item(i);
160
161 String posStr = node.getAttributeNS(ns, "pos");
162 String fromStr = node.getAttributeNS(ns, "from");
163 String toStr = node.getAttributeNS(ns, "to");
164 String minStr = node.getAttributeNS(ns, "min");
165 String maxStr = node.getAttributeNS(ns, "max");
166 String axisType = node.getAttributeNS(ns, "axistype");
167
168 try {
169 int pos = Integer.parseInt(posStr);
170
171 if (pos >= result.length) {
172 // this should never happen
173 logger.debug("The axis is out of valid range: " + pos);
174 continue;
175 }
176
177 if (axisType != null && axisType.equals(DateAxis.TYPE)) {
178 long from = Long.parseLong(fromStr);
179 long to = Long.parseLong(toStr);
180 long min = Long.parseLong(minStr);
181 long max = Long.parseLong(maxStr);
182
183 if (logger.isDebugEnabled()) {
184 logger.debug("date axis from: " + new Date(from));
185 logger.debug("date axis to : " + new Date(to));
186 logger.debug("date axis min : " + new Date(min));
187 logger.debug("date axis max : " + new Date(max));
188 }
189
190 result[pos] = new DateAxis(pos, from, to, min, max);
191 }
192 else {
193 double from = Double.parseDouble(fromStr);
194 double to = Double.parseDouble(toStr);
195 double min = Double.parseDouble(minStr);
196 double max = Double.parseDouble(maxStr);
197
198 result[pos] = new NumberAxis(pos, from, to, min, max);
199 }
200 }
201 catch (NumberFormatException nfe) {
202 nfe.printStackTrace();
203 }
204 }
205
206 logger.debug("Parsed " + result.length + " axes");
207
208 return result;
209 }
210
211
212 /**
213 * Parses the chart info document and extract the Transform2D values.
214 *
215 * @param doc The chart info document.
216 *
217 * @return a Transform2D object to transfrom pixel coordinates into chart
218 * coordinates.
219 */
220 protected Transform2D[] parseTransformationMatrix(Document doc) {
221 logger.debug("ChartInfoServiceImpl.parseTransformationMatrix");
222
223 NodeList matrix = (NodeList) XMLUtils.xpath(
224 doc,
225 XPATH_TRANSFORM_MATRIX,
226 XPathConstants.NODESET,
227 ArtifactNamespaceContext.INSTANCE);
228
229 int num = matrix != null ? matrix.getLength() : 0;
230
231 List<Transform2D> transformer = new ArrayList<Transform2D>(num);
232
233 for (int i = 0; i < num; i++) {
234 Transform2D t = createTransformer((Element) matrix.item(i));
235
236 if (t == null) {
237 logger.warn("Broken transformation matrix at pos: " + i);
238 continue;
239 }
240
241 transformer.add(t);
242 }
243
244 return transformer.toArray(new Transform2D[num]);
245 }
246
247
248 protected Transform2D createTransformer(Element matrix) {
249 String ns = ArtifactNamespaceContext.NAMESPACE_URI;
250
251 String sx = matrix.getAttributeNS(ns, "sx");
252 String sy = matrix.getAttributeNS(ns, "sy");
253 String tx = matrix.getAttributeNS(ns, "tx");
254 String ty = matrix.getAttributeNS(ns, "ty");
255 String xType = matrix.getAttributeNS(ns, "xtype");
256 String yType = matrix.getAttributeNS(ns, "ytype");
257
258 xType = xType == null || xType.length() == 0 ? "number" : xType;
259 yType = yType == null || yType.length() == 0 ? "number" : yType;
260
261 if (sx != null && sy != null && tx != null && ty != null) {
262 try {
263 logger.debug("Create new Transform2D with x format: " + xType);
264 logger.debug("Create new Transform2D with y format: " + yType);
265
266 return new Transform2D(
267 Double.parseDouble(sx),
268 Double.parseDouble(sy),
269 Double.parseDouble(tx),
270 Double.parseDouble(ty),
271 xType, yType);
272 }
273 catch (NumberFormatException nfe) {
274 logger.warn("Error while parsing matrix values.");
275 }
276 }
277
278 logger.warn("No matrix values found.");
279
280 return new Transform2D(1d, 1d, 0d, 0d);
281 }
282 }
283 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
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