Mercurial > dive4elements > river

annotate flys-client/src/main/java/de/intevation/flys/client/server/GFIServiceImpl.java @ 5818:a4ff4167be1e

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Request feature info on all layers and show it as html if the server does not return valid gml. Non queryable layers produce an error message when the request fails. This is good enough
author Andre Heinecke <aheinecke@intevation.de>
date Wed, 24 Apr 2013 17:33:27 +0200
parents af2aa716152f
children
rev   line source
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1 package de.intevation.flys.client.server;
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2
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3 import java.io.InputStream;
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4 import java.io.UnsupportedEncodingException;
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5 import java.io.ByteArrayOutputStream;
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6 import java.io.IOException;
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7 import java.net.URL;
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8 import java.net.URLConnection;
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9 import java.util.ArrayList;
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10 import java.util.List;
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11 import java.util.Scanner;
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12
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13 import org.w3c.dom.Document;
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14 import org.w3c.dom.Node;
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15 import org.w3c.dom.NodeList;
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16
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17 import org.apache.log4j.Logger;
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18
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19 import com.google.gwt.user.server.rpc.RemoteServiceServlet;
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20
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21 import de.intevation.artifacts.common.utils.XMLUtils;
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22
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23 import de.intevation.flys.client.shared.exceptions.ServerException;
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24 import de.intevation.flys.client.shared.model.AttributedTheme;
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25 import de.intevation.flys.client.shared.model.FeatureInfo;
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26 import de.intevation.flys.client.shared.model.FeatureInfoResponse;
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27 import de.intevation.flys.client.shared.model.Theme;
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28
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29 import de.intevation.flys.client.client.services.GFIService;
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30
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31
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32 /**
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33 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
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34 */
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35 public class GFIServiceImpl
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36 extends RemoteServiceServlet
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37 implements GFIService
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38 {
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39 public static final String ERR_NO_VALID_GFI_URL =
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40 "error_no_valid_gfi_url";
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41
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42 public static final String ERR_GFI_REQUEST_FAILED =
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43 "error_gfi_req_failed";
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44
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45 public static final String ERR_PARSING_RESPONSE_FAILED =
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46 "error_gfi_parsing_failed";
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47
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48
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49 private static final Logger logger =
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50 Logger.getLogger(GFIServiceImpl.class);
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51
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52
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53 /**
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54 * @param theme
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55 * @param format
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56 * @param bbox
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57 * @param height
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58 * @param width
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59 * @param x
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60 * @param y
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61 *
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62 * @return
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63 */
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64 public FeatureInfoResponse query(
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65 Theme theme,
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66 String format,
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67 String bbox,
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68 String projection,
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69 int height,
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70 int width,
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71 int x,
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72 int y
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73 ) throws ServerException
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74 {
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75 logger.info("GFIServiceImpl.query");
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76
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77 String path = createGetFeautureInfoURL(
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78 theme, format, bbox, projection, height, width, x, y);
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79
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80 logger.debug("URL=" + path);
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81
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82 try {
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83 URL url = new URL(path);
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84
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85 URLConnection conn = url.openConnection();
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86 conn.connect();
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87
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88 InputStream is = conn.getInputStream();
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89
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90 return parseResponse(is);
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91
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92 }
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93 catch (IOException ioe) {
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94 logger.warn(ioe, ioe);
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95 }
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96
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97 throw new ServerException(ERR_GFI_REQUEST_FAILED);
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98 }
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99
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100
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101 /**
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102 * @param map
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103 * @param theme
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104 * @param format
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105 * @param x
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106 * @param y
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107 *
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108 * @return
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109 */
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110 protected String createGetFeautureInfoURL(
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111 Theme theme,
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112 String infoFormat,
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113 String bbox,
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114 String projection,
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115 int height,
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116 int width,
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117 int x,
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118 int y
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119 ) throws ServerException
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120 {
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121 String url = getUrl(theme);
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122
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123 if (url == null || url.length() == 0) {
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124 throw new ServerException(ERR_NO_VALID_GFI_URL);
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125 }
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126
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127 String layers = ((AttributedTheme)theme).getAttr("layers");
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128
96708d81eaf6 Added an initial GetFeatureInfo tool to get information about points in the map.
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129 StringBuilder sb = new StringBuilder();
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130 sb.append(url);
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131
96708d81eaf6 Added an initial GetFeatureInfo tool to get information about points in the map.
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132 if (url.indexOf("?") < 0) {
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133 sb.append("?SERVICE=WMS");
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134 }
96708d81eaf6 Added an initial GetFeatureInfo tool to get information about points in the map.
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135 else {
96708d81eaf6 Added an initial GetFeatureInfo tool to get information about points in the map.
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136 sb.append("&SERVICE=WMS");
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137 }
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138
96708d81eaf6 Added an initial GetFeatureInfo tool to get information about points in the map.
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139 sb.append("&VERSION=1.1.1");
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140 sb.append("&REQUEST=GetFeatureInfo");
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141 sb.append("&LAYERS=" + layers);
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142 sb.append("&QUERY_LAYERS=" + layers);
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143 sb.append("&BBOX=" + bbox);
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144 sb.append("&HEIGHT=" + height);
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145 sb.append("&WIDTH=" + width);
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146 sb.append("&FORMAT=image/png");
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147 sb.append("&INFO_FORMAT=" + infoFormat);
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148 sb.append("&SRS=" + projection);
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149 sb.append("&X=" + String.valueOf(x));
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150 sb.append("&Y=" + String.valueOf(y));
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151
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152 return sb.toString();
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153 }
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154
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155
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156 protected String getUrl(Theme theme) {
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157 AttributedTheme attr = (AttributedTheme) theme;
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158 return attr.getAttr("url");
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159 }
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160
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161
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162 protected FeatureInfoResponse parseResponse(InputStream is) {
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163 logger.debug("GFIServiceImpl.parseResponse");
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164
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165 ByteArrayOutputStream baos = new ByteArrayOutputStream();
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166 byte [] buf = new byte[1024];
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167
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168 int r = -1;
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169 try {
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170 while ((r = is.read(buf)) >= 0) {
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171 baos.write(buf, 0, r);
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172 }
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173 } catch (IOException ex) {
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174 logger.warn("GetFeatureInfo response could not be read: ", ex);
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175 return new FeatureInfoResponse();
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176 }
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177
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178 String content;
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179 try {
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180 content = baos.toString("UTF-8");
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181 }
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182 catch (UnsupportedEncodingException uee) {
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183 content = baos.toString();
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184 }
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185
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186 Document response = XMLUtils.parseDocument(content);
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187 if (response != null) {
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188 List<FeatureInfo> features = new ArrayList<FeatureInfo>();
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189 parseFeatureInfos(response, features);
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190 return new FeatureInfoResponse(features, null);
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191 }
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192 // Unable to parse just return the response as is
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193 return new FeatureInfoResponse(new ArrayList<FeatureInfo>(), content);
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194 }
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195
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196
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197 protected void parseFeatureInfos(Node node, List<FeatureInfo> features) {
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198 logger.debug("GFIServiceImpl.parseFeatureInfos");
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199
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200 String name = node.getNodeName();
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201
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diff changeset
202 if (name.endsWith("_layer")) {
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203 features.add(parseFeature(node));
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204
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diff changeset
205 return;
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diff changeset
206 }
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207
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diff changeset
208 NodeList children = node.getChildNodes();
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209
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diff changeset
210 if (children != null && children.getLength() > 0) {
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diff changeset
211 for (int i = 0, n = children.getLength(); i < n; i++) {
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diff changeset
212 parseFeatureInfos(children.item(i), features);
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213 }
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diff changeset
214 }
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diff changeset
215 }
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diff changeset
216
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217
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diff changeset
218 protected FeatureInfo parseFeature(Node node) {
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diff changeset
219 logger.debug("GFIServiceImpl.parseFeature");
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220
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diff changeset
221 String layername = node.getNodeName();
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222
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223 FeatureInfo f = new FeatureInfo(layername);
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224
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diff changeset
225 NodeList children = node.getChildNodes();
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diff changeset
226 int numChildren = children != null ? children.getLength() : 0;
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227
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diff changeset
228 logger.debug("Feature '" + layername + "' has " + numChildren + " nodes.");
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229
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diff changeset
230 for (int i = 0; i < numChildren; i++) {
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diff changeset
231 Node tmp = children.item(i);
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diff changeset
232 String nodeName = tmp.getNodeName();
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233
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diff changeset
234 logger.debug(" node name: '" + nodeName + "'");
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235
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diff changeset
236 if (nodeName.equals("gml:name")) {
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diff changeset
237 logger.debug("NAME node has child: " + tmp.getFirstChild().getNodeValue());
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diff changeset
238 f.setLayername(tmp.getFirstChild().getNodeValue());
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diff changeset
239 }
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diff changeset
240 else if (nodeName.endsWith("_feature")) {
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diff changeset
241 parseFeatureAttributes(tmp, f);
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242 }
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243 }
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244
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245 return f;
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246 }
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247
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248
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249 protected void parseFeatureAttributes(Node node, FeatureInfo f) {
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250 logger.debug("GFIServiceImpl.parseFeatureAttributes");
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251
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252 NodeList children = node.getChildNodes();
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253 int numChildren = children != null ? children.getLength() : 0;
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254
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255 logger.debug("Has " + numChildren + " attributes.");
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256
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257 for (int i = 0; i < numChildren; i++) {
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258 Node tmp = children.item(i);
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259 String name = tmp.getNodeName();
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260
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261 logger.debug(" tmp attribute name: '" + name + "'");
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parents: 1400
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262
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263 if (name.equals("gml:boundedBy")) {
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264 // TODO
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265 }
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266 else {
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267 Node child = tmp.getFirstChild();
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parents: 1400
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268 if (child != null) {
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parents: 1400
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269 f.addAttr(name, child.getNodeValue());
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270 }
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271 }
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272 }
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273 }
1400
96708d81eaf6 Added an initial GetFeatureInfo tool to get information about points in the map.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents:
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274 }
96708d81eaf6 Added an initial GetFeatureInfo tool to get information about points in the map.
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parents:
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275 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org