Mercurial > dive4elements > gnv-client

annotate gnv/src/main/java/de/intevation/gnv/action/mapviewer/parser/XMLExternalCallParser.java @ 953:4b64b4d1f0cf

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Add more Javadocs gnv/trunk@1097 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Tim Englich <tim.englich@intevation.de>
date Tue, 18 May 2010 07:32:45 +0000
parents 57fa8019fbdc
children 28a0628b11b0
rev   line source
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1 package de.intevation.gnv.action.mapviewer.parser;
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2
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3 import java.io.InputStream;
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4 import java.util.ArrayList;
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5 import java.util.Collection;
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6
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7 import org.apache.log4j.Logger;
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8 import org.w3c.dom.Document;
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9 import org.w3c.dom.Element;
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10 import org.w3c.dom.NodeList;
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11
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12 import de.intevation.gnv.artifactdatabase.objects.map.DefaultLayer;
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13 import de.intevation.gnv.artifactdatabase.objects.map.DefaultMapService;
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14 import de.intevation.gnv.artifactdatabase.objects.map.Layer;
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15 import de.intevation.gnv.artifactdatabase.objects.map.MapService;
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16 import de.intevation.gnv.util.XMLUtils;
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17
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18 /**
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19 * This class provides an XMl-Parser which try's to create an DOM from
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20 * an given Inputstream. Is this is possible it try to read the required
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21 * informations e.g. Mapservices, Layer, SRID and Geometry from the
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22 * document.
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23 * @author <a href="mailto:tim.englich@intevation.de">Tim Englich</a>
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24 */
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25 public class XMLExternalCallParser implements ExternalCallParser {
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26
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27 /**
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28 * the logger, used to log exceptions and additonaly information
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29 */
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30 private static Logger log = Logger.getLogger(XMLExternalCallParser.class);
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32 private static String XPATH_GEOMETRY = "/gnviewer/location/data";
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33 private static String XPATH_SRS = "/gnviewer/location/srs";
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34 private static String XPATH_MAPSERVICES_NODESET = "/gnviewer/mapservices/mapservice";
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35 private static String XPATH_LAYER = "layer";
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36 private static String ATTRIBUTE_ID = "id";
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37 private static String ATTRIBUTE_NAME = "name";
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38 private static String ATTRIBUTE_TYPE = "type";
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39 private static String ATTRIBUTE_URL = "url";
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40
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41 /**
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42 * The geometry which was parsed from the document.
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43 */
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44 private String geometry = null;
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45
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46 /**
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47 * The srid which was parsed from the document.
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48 */
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49 private String srs = null;
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50
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51 /**
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52 * The mapservices that were parsed from the document.
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53 */
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54 private Collection<MapService> mapServices = null;
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55
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56 /**
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57 * The inputstream where the data should be read from.
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58 */
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59 private InputStream inputStream = null;
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60
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61 /**
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62 * Constructor
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63 * @param inputStream The stream where the data should be read from
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64 */
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65 public XMLExternalCallParser(InputStream inputStream) {
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66 this.inputStream = inputStream;
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67 }
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68
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69 public String getGeometry() {
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70 return this.geometry;
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71 }
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72
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73 public Collection<MapService> getMapServices() {
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74 return this.mapServices;
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75 }
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76
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77 public void parse() throws ExternalCallParserException {
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78 if (inputStream != null){
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79 XMLUtils xmlUtils = new XMLUtils();
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80 Document document = xmlUtils.readDocument(this.inputStream);
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81 if (document != null){
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82
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83 this.geometry = xmlUtils.getStringXPath(document,
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84 XPATH_GEOMETRY);
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85 this.srs = xmlUtils.getStringXPath(document, XPATH_SRS);
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86 NodeList mapservicesNodes =
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87 xmlUtils.getNodeSetXPath(document,
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88 XPATH_MAPSERVICES_NODESET);
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89 if (mapservicesNodes != null){
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90 this.mapServices = new ArrayList<MapService>(mapservicesNodes.getLength());
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91 for (int i = 0; i < mapservicesNodes.getLength(); i++){
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92 Element mapserviceNode = (Element)mapservicesNodes.item(i);
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93 String mapserviceID = mapserviceNode.getAttribute(ATTRIBUTE_ID);
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94 String mapserviceType = mapserviceNode.getAttribute(ATTRIBUTE_TYPE);
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95 String mapserviceUrl = mapserviceNode.getAttribute(ATTRIBUTE_URL);
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96 NodeList layerNodes = xmlUtils.getNodeSetXPath(mapserviceNode, XPATH_LAYER);
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97 Collection<Layer> layer = null;
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98 if (layerNodes != null && layerNodes.getLength() > 0){
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99 layer = new ArrayList<Layer>(layerNodes.getLength());
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100 layer = this.extractLayer(layer, null, layerNodes);
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101 }else{
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102 log.debug("No Layer given for this Mapservice");
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103 }
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104 MapService mapService =
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105 new DefaultMapService(mapserviceID, layer,
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106 mapserviceType, mapserviceUrl);
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107 this.mapServices.add(mapService);
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108 }
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109
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110 }else{
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111 String errMsg = "XML-Document does not contain any " +
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112 "Mapservices which are required.";
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113 log.error(errMsg);
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114 throw new ExternalCallParserException(errMsg);
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115 }
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116
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117 }else{
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118 String errMsg = "XML-Document could not " +
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119 "be read from InputStream.";
402
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120 log.error(errMsg);
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121 throw new ExternalCallParserException(errMsg);
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122 }
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123 }else{
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124 String errMsg = "No InputStream given for parsing the Call.";
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125 log.error(errMsg);
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126 throw new ExternalCallParserException(errMsg);
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127 }
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128 }
681
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129
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130 /**
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131 * This Method extracts all Layers and put them into the Collection.
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132 * @param layer the collection where the layer should be add to.
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133 * @param groupId the id of the group of the layers
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134 * @param layerNodes the Nodes which should contain the intormations
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135 * about layers
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136 * @return the layer
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137 */
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138 private Collection<Layer> extractLayer(Collection<Layer> layer,
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139 String groupId,
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140 NodeList layerNodes){
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141 for (int i = 0; i < layerNodes.getLength(); i++){
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142 Element layerNode = (Element)layerNodes.item(i);
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143 String id = layerNode.getAttribute(ATTRIBUTE_ID);
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144 String name = layerNode.getAttribute(ATTRIBUTE_NAME);
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145 NodeList localLayerNodes = XMLUtils.getNodeSetXPath(layerNode,
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146 XPATH_LAYER);
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147 Layer tmpLayer = new DefaultLayer(id, name,
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148 (localLayerNodes != null &&
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149 localLayerNodes.getLength() > 0),
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150 groupId);
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151 layer.add(tmpLayer);
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152 if (localLayerNodes != null && localLayerNodes.getLength() > 0){
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153 layer = this.extractLayer(layer, id, localLayerNodes);
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154 }
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155 }
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156 return layer;
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157 }
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158
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159 public String getSRS() {
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160 return this.srs;
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161 }
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162
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163 }
http://dive4elements.wald.intevation.org