Mercurial > dive4elements > gnv-client

annotate gnv-artifacts/src/main/java/de/intevation/gnv/artifacts/services/MetaDataService.java @ 597:cf38b983d1f3

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Added the Implementation of the MetaDataService which will deliver FIS and Parameters that match to Mapservices, Region and Layers that were sent to the Service. gnv-artifacts/trunk@653 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Tim Englich <tim.englich@intevation.de>
date Mon, 01 Feb 2010 14:52:05 +0000
parents
children 938ce81a6bd0
rev   line source
597
cf38b983d1f3 Added the Implementation of the MetaDataService which will deliver FIS and Parameters that match to Mapservices, Region and Layers that were sent to the Service.
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parents:
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1 /**
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2 *
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3 */
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4 package de.intevation.gnv.artifacts.services;
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5
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6 import java.util.ArrayList;
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7 import java.util.Collection;
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8 import java.util.Iterator;
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9
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10 import javax.xml.xpath.XPathConstants;
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11
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12 import org.apache.log4j.Logger;
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13 import org.w3c.dom.Document;
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14 import org.w3c.dom.Element;
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15 import org.w3c.dom.Node;
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16 import org.w3c.dom.NodeList;
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17
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18 import com.vividsolutions.jts.geom.Geometry;
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19 import com.vividsolutions.jts.io.ParseException;
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20 import com.vividsolutions.jts.io.WKTReader;
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21
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22 import de.intevation.artifactdatabase.DefaultService;
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23 import de.intevation.artifactdatabase.XMLUtils;
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24 import de.intevation.artifacts.ArtifactNamespaceContext;
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25 import de.intevation.artifacts.CallMeta;
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26 import de.intevation.artifacts.ServiceFactory;
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27 import de.intevation.gnv.artifacts.services.requestobjects.DefaultFIS;
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28 import de.intevation.gnv.artifacts.services.requestobjects.DefaultLayer;
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29 import de.intevation.gnv.artifacts.services.requestobjects.DefaultMapService;
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30 import de.intevation.gnv.artifacts.services.requestobjects.FIS;
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31 import de.intevation.gnv.artifacts.services.requestobjects.Layer;
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32 import de.intevation.gnv.artifacts.services.requestobjects.MapService;
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33 import de.intevation.gnv.artifacts.services.requestobjects.Parameter;
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34 import de.intevation.gnv.geobackend.base.Result;
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35 import de.intevation.gnv.geobackend.base.query.QueryExecutor;
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36 import de.intevation.gnv.geobackend.base.query.QueryExecutorFactory;
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37 import de.intevation.gnv.geobackend.base.query.exception.QueryException;
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38 import de.intevation.gnv.utils.ArtifactXMLUtilities;
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39
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40 /**
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41 * @author Tim Englich <tim.englich@intevation.de>
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42 *
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43 */
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44 public class MetaDataService extends DefaultService {
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45
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46 /**
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47 * the logger, used to log exceptions and additionally information
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48 */
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49 private static Logger log = Logger.getLogger(MetaDataService.class);
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50
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51
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52 private final static String FIS_REGION_QUERY_ID = "fis_region";
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53 private final static String MAPSERVICES_HAS_FIS_QUERY_ID =
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54 "mapservices_has_fis";
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55
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56 private static String ATTRIBUTE_ID = "id";
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57 private static String ATTRIBUTE_NAME = "name";
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58 private static String ATTRIBUTE_TYPE = "type";
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59 private static String ATTRIBUTE_URL = "url";
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60 private static String ATTRIBUTE_GROUPLAYER = "isgrouplayer";
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61 private static String ATTRIBUTE_PARENTID = "parentid";
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62 private static String ATTRIBUTE_SRS = "srs";
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63
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64
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65 private static String XPATH_LOACTION_NODE = "art:GetMetaData/art:location";
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66 private static String XPATH_MAPSERVICES_NODESET = "art:GetMetaData/" +
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67 "art:mapservices/" +
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68 "art:mapservice";
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69 private static String XPATH_LAYER_NODESET = "art:layer";
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70
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71 /**
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72 * The UID of this Class.
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73 */
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74 private static final long serialVersionUID = -8446483887497236372L;
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75
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76 /**
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77 * Constructor
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78 */
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79 public MetaDataService() {
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80 super();
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81 }
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82
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83 /**
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84 * @see de.intevation.artifactdatabase.DefaultService#process(org.w3c.dom.Document, java.lang.Object, de.intevation.artifacts.CallMeta)
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85 */
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86 @Override
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87 public Document process(Document data, Object globalContext,
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88 CallMeta callMeta) {
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89 log.debug("MetaDataService.process");
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90 Document document = null;
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91 try {
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92 Geometry g = this.parseGeometry(data);
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93 Collection<MapService> mapServices = this.parseMapServices(data);
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94 Collection<FIS> resultFIS = this.unionFIS(this.getFIS(g),
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95 this.getFIS(mapServices));
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96 document = XMLUtils.newDocument();
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97 this.writeFIS2Document(document, resultFIS);
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98 } catch (MetaDataServiceException e) {
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99 log.error(e,e);
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100 document = new ArtifactXMLUtilities()
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101 .createExceptionReport(e.getMessage(), document);
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102 }
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103 return document;
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104 }
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105
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106 private Geometry parseGeometry(Document data)
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107 throws MetaDataServiceException{
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108 log.debug("MetaDataService.parseGeometry");
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109
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110 Element locationNode = (Element) XMLUtils.xpath(
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111 data,
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112 XPATH_LOACTION_NODE,
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113 XPathConstants.NODE,
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114 ArtifactNamespaceContext.INSTANCE
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115 );
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116 Geometry returnValue = null;
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117 if (locationNode != null) {
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118 String srs = locationNode.getAttribute(ATTRIBUTE_SRS);
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119 // TODO: use SRS to transform the Geometry to target-System.
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120 String geometryValue = locationNode.getTextContent();
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121 if (geometryValue != null){
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122 try {
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123 returnValue = new WKTReader().read(geometryValue);
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124 } catch (ParseException e) {
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125 log.error(e,e);
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126 throw new MetaDataServiceException("The given Geometry" +
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127 "String is not a " +
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128 "valid WKT.");
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129 }
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130 }
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131 }
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132 return returnValue;
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133 }
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134
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135 private Collection<MapService> parseMapServices(Document data){
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136 log.debug("MetaDataService.parseMapServices");
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137
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138 NodeList mapServices = (NodeList) XMLUtils.xpath(data,
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139 XPATH_MAPSERVICES_NODESET,
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140 XPathConstants.NODESET,
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141 ArtifactNamespaceContext.INSTANCE);
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142 Collection<MapService> returnValue = null;
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143 if (mapServices != null){
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144 returnValue = new ArrayList<MapService>(mapServices.getLength());
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145 for (int i = 0; i < mapServices.getLength(); i++){
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146 Element mapServiceNode = (Element)mapServices.item(i);
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147 String id = mapServiceNode.getAttribute(ATTRIBUTE_ID);
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148 String type = mapServiceNode.getAttribute(ATTRIBUTE_TYPE);
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149 String url = mapServiceNode.getAttribute(ATTRIBUTE_URL);
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150 Collection<Layer> layer = null;
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151
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152 NodeList layerNodes = (NodeList) XMLUtils.xpath(mapServiceNode,
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153 XPATH_LAYER_NODESET,
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154 XPathConstants.NODESET,
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155 ArtifactNamespaceContext.INSTANCE);
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156 if (layerNodes != null){
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157 layer = new ArrayList<Layer>(layerNodes.getLength());
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158 for (int j = 0; j < layerNodes.getLength(); j++){
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159 Element layerNode = (Element)layerNodes.item(j);
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160 String layerId = layerNode.getAttribute(ATTRIBUTE_ID);
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161 String layerName = layerNode.getAttribute(ATTRIBUTE_NAME);
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162 boolean isGroupLayer =
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163 Boolean.parseBoolean(layerNode
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164 .getAttribute(
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165 ATTRIBUTE_GROUPLAYER));
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166 String parentId = layerNode
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167 .getAttribute(ATTRIBUTE_PARENTID);
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168
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169 layer.add(new DefaultLayer(layerId,
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170 layerName,
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171 isGroupLayer,
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172 parentId));
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173 }
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174 }
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175 MapService mapService = new DefaultMapService(id, layer,
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176 type, url);
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177 returnValue.add(mapService);
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178
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179 }
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180 }
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181 return returnValue;
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182 }
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183
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184 private Collection<FIS> unionFIS(Collection<FIS> fromGeometry,
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185 Collection<FIS> fromMapservices){
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186 log.debug("MetaDataService.unionFIS");
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187 Collection<FIS> returnValue = null;
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188 if (fromGeometry == null || fromGeometry.isEmpty()){
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189 returnValue = fromMapservices;
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190 }else if (fromMapservices == null || fromMapservices.isEmpty()){
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191 returnValue = fromGeometry;
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192 }else{
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193
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194 returnValue = new ArrayList<FIS>();
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195 Iterator<FIS> it = fromMapservices.iterator();
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196 while (it.hasNext()){
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197 FIS fis = it.next();
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198 if (fromGeometry.contains(fis)){
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199 returnValue.add(fis);
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200 }
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201 }
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202 }
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203 return returnValue;
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204 }
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205
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206 /**
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207 * Puts the retrieved FIS into the given XML-Document.
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208 * @param document the Document where the FIS should be put in.
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209 * @param fis the retrieved FIS which should be written into
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210 * the XML-Document.
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211 */
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212 private void writeFIS2Document(Document document, Collection<FIS> fis){
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213
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214 if (fis != null){
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215 Iterator<FIS> it = fis.iterator();
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216 XMLUtils.ElementCreator creator = new XMLUtils.ElementCreator(
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217 document,
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218 ArtifactNamespaceContext.NAMESPACE_URI,
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219 ArtifactNamespaceContext.NAMESPACE_PREFIX
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220 );
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221 Node rootNode = creator.create("result");
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222 document.appendChild(rootNode);
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223
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224 Node factoriesNode = creator.create("factories");
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225 rootNode.appendChild(factoriesNode);
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226 while (it.hasNext()){
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227 FIS tmpFIS = it.next();
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228 Element fisNode = creator.create("factory");
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229 fisNode.setAttribute("art:name",tmpFIS.getID());
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230
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231 Collection<Parameter> parameter = tmpFIS.getParameter();
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232
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233 if(parameter != null){
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234 Iterator<Parameter> pit = parameter.iterator();
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235 while (pit.hasNext()){
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236 Parameter p = pit.next();
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237 Element parameterNode = creator.create("parameter");
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238 parameterNode.setAttribute(ATTRIBUTE_ID, p.getID());
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239 parameterNode.setAttribute(ATTRIBUTE_NAME, p.getName());
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240 fisNode.appendChild(parameterNode);
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241 }
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242 }
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243 factoriesNode.appendChild(fisNode);
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244 }
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245 }
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246 }
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247
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248 /**
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249 * Returns all FIS which Areas is intersected by this given Geometry
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250 * @param g the Geometry which should be used to determine the FIS.
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251 * @return all FIS which Areas is intersected by this given Geometry
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252 */
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253 protected Collection<FIS> getFIS(Geometry g)
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254 throws MetaDataServiceException{
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255 log.debug("MetaDataService.getFIS ==> Geometry");
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256 Collection<FIS> resultValue = null;
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257 if (g != null){
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258 try {
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259 QueryExecutor queryExecutor = QueryExecutorFactory
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260 .getInstance()
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261 .getQueryExecutor();
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262 Collection<Result> result = queryExecutor.executeQuery(FIS_REGION_QUERY_ID,
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263 new String[]{g.toString()});
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264
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265 if (result != null){
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266 resultValue = new ArrayList<FIS>(result.size());
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267 Iterator<Result> it = result.iterator();
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268 while (it.hasNext()){
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269 Result value = it.next();
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270 String fis_id = value.getString(0);
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271 resultValue.add(new DefaultFIS(fis_id));
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272 }
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273 }
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274 } catch (QueryException e) {
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275 log.error(e,e);
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276 throw new MetaDataServiceException("Cannot Query FIS from DB.");
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277 }
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278 }
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279 return resultValue;
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280 }
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281
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282 /**
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283 * Returns all FIS which were represented by the given Mapservices
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284 * @param mapServices the Mapservices which should determine the FIS.
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285 * @return all FIS which where represented my the given Mapservices.
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286 */
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287 protected Collection<FIS> getFIS(Collection<MapService> mapServices)
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288 throws MetaDataServiceException{
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289 log.debug("MetaDataService.getFIS ==> MapServices");
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290 Collection<FIS> resultValue = null;
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291 if (mapServices != null && !mapServices.isEmpty()){
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292 try {
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293
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294 String mapServiceNames = "";
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295 Iterator<MapService> mit = mapServices.iterator();
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296 while(mit.hasNext()){
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297 if (mapServiceNames.length() > 0){
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298 mapServiceNames += " , ";
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299 }
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300 mapServiceNames += "\""+mit.next().getID()+"\"";
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301 }
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302
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303 QueryExecutor queryExecutor = QueryExecutorFactory
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304 .getInstance()
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305 .getQueryExecutor();
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306 Collection<Result> result = queryExecutor.executeQuery(
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307 MAPSERVICES_HAS_FIS_QUERY_ID,
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308 new String[]{mapServiceNames});
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309 if (result != null){
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310 resultValue = new ArrayList<FIS>(result.size());
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311 Iterator<Result> it = result.iterator();
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312 while (it.hasNext()){
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313 Result value = it.next();
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314 String fis_id = value.getString(0);
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315
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316 // TODO: QUERY PARAMS
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317 // FIRST LOOK IF ONE MAPSERVICE REPRESENTS ONLY ONE PARAM
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318 // IF FALSE LOOK IF THE GIVEN LAYERs TO AN MAPSERVICE
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319 // REPRESENTS DIFFERENT PARAMS
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320 Collection<Parameter> parameter = null;
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321 resultValue.add(new DefaultFIS(fis_id, parameter));
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322 }
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323 }
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324 } catch (QueryException e) {
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325 log.error(e,e);
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326 throw new MetaDataServiceException("Cannot Query FIS from DB.");
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327 }
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328
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329 }
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330 return resultValue;
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331 }
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332
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333 /**
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334 * @see de.intevation.artifactdatabase.DefaultService#setup(de.intevation.artifacts.ServiceFactory, java.lang.Object)
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335 */
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336 @Override
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337 public void setup(ServiceFactory factory, Object globalContext) {
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338 log.debug("MetaDataService.setup");
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339 super.setup(factory, globalContext);
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340 // TODO: Perhaps it is necessary to init the QueryIds here.
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341 }
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342
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343 }
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