Mercurial > dive4elements > river

annotate flys-artifacts/src/main/java/de/intevation/flys/artifacts/services/MapInfoService.java @ 4569:276d9bd3c77d

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Workaround for NPE in FloodMapState.
author Christian Lins <christian.lins@intevation.de>
date Tue, 20 Nov 2012 12:53:14 +0100
parents 8e66293c5369
children 6aa1b8abe2d3
rev   line source
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c37084f31c84 Implemented a MapInfo service that returns some basic information to create maps for specific rivers.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents:
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1 package de.intevation.flys.artifacts.services;
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2
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3 import org.apache.log4j.Logger;
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4
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5 import java.util.Map;
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6 import java.util.HashMap;
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7
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8 import org.w3c.dom.Document;
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9 import org.w3c.dom.Node;
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10 import org.w3c.dom.Element;
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12 import javax.xml.xpath.XPathConstants;
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13
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14 import com.vividsolutions.jts.geom.Envelope;
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15
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16 import de.intevation.artifacts.CallMeta;
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17 import de.intevation.artifacts.GlobalContext;
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18
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19 import de.intevation.artifacts.common.ArtifactNamespaceContext;
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20 import de.intevation.artifacts.common.utils.Config;
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21 import de.intevation.artifacts.common.utils.XMLUtils;
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22 import de.intevation.artifacts.common.utils.XMLUtils.ElementCreator;
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23
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24 import de.intevation.artifactdatabase.XMLService;
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25
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26 import de.intevation.flys.utils.GeometryUtils;
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27
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28 /**
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29 * This service provides information about the supported rivers by this
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30 * application.
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31 *
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32 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
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33 */
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34 public class MapInfoService extends XMLService {
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35
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36 /** XPath that points to the river.*/
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37 public static final String XPATH_RIVER = "/mapinfo/river/text()";
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38
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39 public static final String XPATH_RIVER_PROJECTION =
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40 "/artifact-database/floodmap/river[@name=$river]/srid/@value";
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41
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42 public static final String XPATH_RIVER_BACKGROUND =
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43 "/artifact-database/floodmap/river[@name=$river]/background-wms";
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44
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45 public static final String XPATH_RIVER_WMS =
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46 "/artifact-database/floodmap/river[@name=$river]/river-wms/@url";
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48
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49 /** The logger used in this service.*/
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50 private static Logger logger = Logger.getLogger(MapInfoService.class);
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51
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52
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53 /**
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54 * The default constructor.
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55 */
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56 public MapInfoService() {
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57 }
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58
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59 protected static String getStringXPath(
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60 String query,
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61 Map<String, String> variables
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62 ) {
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63 return (String)XMLUtils.xpath(
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64 Config.getConfig(), query, XPathConstants.STRING,
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65 null, variables);
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66 }
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67
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68 protected static Node getNodeXPath(
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69 String query,
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70 Map<String, String> variables
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71 ) {
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72 return (Node)XMLUtils.xpath(
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73 Config.getConfig(), query, XPathConstants.NODE,
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74 null, variables);
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75 }
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76
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77 @Override
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78 public Document processXML(
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79 Document data,
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80 GlobalContext globalContext,
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81 CallMeta callMeta
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82 ) {
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83 logger.debug("MapInfoService.process");
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84
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85 Document result = XMLUtils.newDocument();
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86 ElementCreator cr = new ElementCreator(result, null, null);
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87
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88 Element mapinfo = cr.create("mapinfo");
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89 result.appendChild(mapinfo);
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90
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91 String river = extractRiver(data);
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92 if (river == null || river.length() == 0) {
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93 logger.warn("Cannot generate information: river is empty!");
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94 return result;
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95 }
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96
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97 Element root = cr.create("river");
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98 cr.addAttr(root, "name", river);
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99 mapinfo.appendChild(root);
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100
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101 Envelope env = GeometryUtils.getRiverBoundary(river);
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102 if (env != null) {
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103 String bounds = GeometryUtils.jtsBoundsToOLBounds(env);
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104 logger.debug("River '" + river + "' bounds: " + bounds);
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105
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106 Element bbox = cr.create("bbox");
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107 cr.addAttr(bbox, "value", bounds);
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108 root.appendChild(bbox);
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109 }
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110
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111 Map<String, String> vars = new HashMap<String, String>();
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112 vars.put("river", river);
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113
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114 String sridStr = getStringXPath(XPATH_RIVER_PROJECTION, vars);
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115
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116 if (sridStr != null && sridStr.length() > 0) {
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117 Element srid = cr.create("srid");
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118 cr.addAttr(srid, "value", sridStr);
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119 root.appendChild(srid);
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120 }
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121
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122 Element back = (Element)getNodeXPath(XPATH_RIVER_BACKGROUND, vars);
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123 if (back != null) {
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124 Element background = cr.create("background-wms");
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125 cr.addAttr(background, "url", back.getAttribute("url"));
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126 cr.addAttr(background, "layers", back.getAttribute("layers"));
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127 root.appendChild(background);
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128 }
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129
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130 String wmsStr = getStringXPath(XPATH_RIVER_WMS, vars);
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131 if (wmsStr != null && wmsStr.length() > 0) {
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132 Element wms = cr.create("river-wms");
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133 cr.addAttr(wms, "url", wmsStr);
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134 root.appendChild(wms);
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135 }
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136
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137 return result;
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138 }
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139
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140
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141 protected String extractRiver(Document data) {
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142 return XMLUtils.xpathString(
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143 data, XPATH_RIVER, ArtifactNamespaceContext.INSTANCE);
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144 }
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145 }
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146 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org