Mercurial > dive4elements > river

annotate flys-artifacts/src/main/java/de/intevation/flys/artifacts/services/MapInfoService.java @ 4805:722b4962e30e

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Comment/doc.
author Felix Wolfsteller <felix.wolfsteller@intevation.de>
date Wed, 16 Jan 2013 11:38:06 +0100
parents 6aa1b8abe2d3
children 5ca2516ebef1
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 com.vividsolutions.jts.geom.Envelope;
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4
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5 import de.intevation.artifactdatabase.XMLService;
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6 import de.intevation.artifacts.CallMeta;
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7 import de.intevation.artifacts.GlobalContext;
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8 import de.intevation.artifacts.common.ArtifactNamespaceContext;
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9 import de.intevation.artifacts.common.utils.Config;
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10 import de.intevation.artifacts.common.utils.XMLUtils;
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11 import de.intevation.artifacts.common.utils.XMLUtils.ElementCreator;
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12 import de.intevation.flys.utils.GeometryUtils;
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13
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14 import java.util.HashMap;
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15 import java.util.Map;
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17 import javax.xml.xpath.XPathConstants;
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18
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19 import org.apache.log4j.Logger;
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20 import org.w3c.dom.Document;
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21 import org.w3c.dom.Element;
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22 import org.w3c.dom.Node;
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23
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24 /**
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25 * This service provides information about the supported rivers by this
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26 * application.
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27 *
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28 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
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29 */
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30 public class MapInfoService extends XMLService {
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31
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32 /** XPath that points to the river.*/
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33 public static final String XPATH_RIVER = "/mapinfo/river/text()";
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34
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35 public static final String XPATH_RIVER_PROJECTION =
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36 "/artifact-database/floodmap/river[@name=$river]/srid/@value";
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37
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38 public static final String XPATH_RIVER_BACKGROUND =
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39 "/artifact-database/floodmap/river[@name=$river]/background-wms";
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40
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41 public static final String XPATH_RIVER_WMS =
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42 "/artifact-database/floodmap/river[@name=$river]/river-wms";
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44
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45 /** The logger used in this service.*/
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46 private static Logger logger = Logger.getLogger(MapInfoService.class);
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47
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48
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49 /**
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50 * The default constructor.
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51 */
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52 public MapInfoService() {
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53 }
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54
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55 protected static String getStringXPath(
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56 String query,
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57 Map<String, String> variables
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58 ) {
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59 return (String)XMLUtils.xpath(
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60 Config.getConfig(), query, XPathConstants.STRING,
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61 null, variables);
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62 }
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63
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64 protected static Node getNodeXPath(
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65 String query,
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66 Map<String, String> variables
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67 ) {
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68 return (Node)XMLUtils.xpath(
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69 Config.getConfig(), query, XPathConstants.NODE,
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70 null, variables);
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71 }
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72
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73 @Override
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74 public Document processXML(
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75 Document data,
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76 GlobalContext globalContext,
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77 CallMeta callMeta
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78 ) {
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79 logger.debug("MapInfoService.process");
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80
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81 Document result = XMLUtils.newDocument();
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82 ElementCreator cr = new ElementCreator(result, null, null);
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83
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84 Element mapinfo = cr.create("mapinfo");
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85 result.appendChild(mapinfo);
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86
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87 String river = extractRiver(data);
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88 if (river == null || river.length() == 0) {
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89 logger.warn("Cannot generate information: river is empty!");
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90 return result;
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91 }
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92
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93 Element root = cr.create("river");
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94 cr.addAttr(root, "name", river);
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95 mapinfo.appendChild(root);
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96
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97 Envelope env = GeometryUtils.getRiverBoundary(river);
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98 if (env != null) {
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99 String bounds = GeometryUtils.jtsBoundsToOLBounds(env);
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100 logger.debug("River '" + river + "' bounds: " + bounds);
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101
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102 Element bbox = cr.create("bbox");
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103 cr.addAttr(bbox, "value", bounds);
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104 root.appendChild(bbox);
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105 }
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106
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107 Map<String, String> vars = new HashMap<String, String>();
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108 vars.put("river", river);
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109
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110 String sridStr = getStringXPath(XPATH_RIVER_PROJECTION, vars);
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111
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112 if (sridStr != null && sridStr.length() > 0) {
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113 Element srid = cr.create("srid");
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114 cr.addAttr(srid, "value", sridStr);
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115 root.appendChild(srid);
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116 }
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117
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118 logger.debug("processXML: " + XMLUtils.toString(root));
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119 root.appendChild(
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120 createWMSElement("background-wms", XPATH_RIVER_BACKGROUND, vars, cr));
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121 root.appendChild(
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122 createWMSElement("river-wms", XPATH_RIVER_WMS, vars, cr));
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123
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124 return result;
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125 }
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126
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127
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128 protected Element createWMSElement(
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129 String elementName,
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130 String xpath,
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131 Map<String, String> vars,
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132 ElementCreator cr)
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133 {
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134 logger.debug("createWMSElement()");
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135
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136 Element el = cr.create(elementName);
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137 Element wms = (Element)getNodeXPath(xpath, vars);
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138
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139 if (wms != null) {
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140 cr.addAttr(el, "url", wms.getAttribute("url"));
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141 cr.addAttr(el, "layers", wms.getAttribute("layers"));
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142
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143 logger.debug("createWMSElement: " + XMLUtils.toString(el));
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144 }
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145 else {
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146 logger.debug("createWMSElement: wms == null");
1058
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147 }
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148
4801
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149 return el;
1058
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150 }
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151
c37084f31c84 Implemented a MapInfo service that returns some basic information to create maps for specific rivers.
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152
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153 protected String extractRiver(Document data) {
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154 return XMLUtils.xpathString(
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155 data, XPATH_RIVER, ArtifactNamespaceContext.INSTANCE);
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156 }
c37084f31c84 Implemented a MapInfo service that returns some basic information to create maps for specific rivers.
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157 }
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158 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org