Mercurial > dive4elements > river
annotate gwt-client/src/main/java/org/dive4elements/river/client/server/GFIServiceImpl.java @ 9726:0a5239a1e46e 3.2.x
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author | Tom Gottfried <tom@intevation.de> |
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date | Wed, 02 Mar 2022 10:26:50 +0100 |
parents | 5e38e2924c07 |
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1 /* Copyright (C) 2011, 2012, 2013 by Bundesanstalt für Gewässerkunde |
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2 * Software engineering by Intevation GmbH |
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3 * |
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4 * This file is Free Software under the GNU AGPL (>=v3) |
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5 * and comes with ABSOLUTELY NO WARRANTY! Check out the |
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6 * documentation coming with Dive4Elements River for details. |
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7 */ |
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8 |
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9 package org.dive4elements.river.client.server; |
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10 |
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11 import com.google.gwt.user.server.rpc.RemoteServiceServlet; |
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12 |
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13 import java.io.ByteArrayOutputStream; |
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14 import java.io.IOException; |
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15 import java.io.InputStream; |
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16 import java.io.UnsupportedEncodingException; |
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17 |
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18 import java.net.URL; |
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19 import java.net.URLConnection; |
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20 |
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21 import java.util.ArrayList; |
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22 import java.util.List; |
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23 |
9726 | 24 import org.apache.logging.log4j.Logger; |
25 import org.apache.logging.log4j.LogManager; | |
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26 |
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27 import org.dive4elements.artifacts.common.utils.XMLUtils; |
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28 |
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29 import org.dive4elements.river.client.client.services.GFIService; |
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30 |
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31 import org.dive4elements.river.client.shared.exceptions.ServerException; |
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32 |
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33 import org.dive4elements.river.client.shared.model.AttributedTheme; |
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34 import org.dive4elements.river.client.shared.model.FeatureInfo; |
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35 import org.dive4elements.river.client.shared.model.FeatureInfoResponse; |
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36 import org.dive4elements.river.client.shared.model.Theme; |
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37 |
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38 import org.w3c.dom.Document; |
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39 import org.w3c.dom.Node; |
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40 import org.w3c.dom.NodeList; |
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41 |
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42 /** |
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43 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a> |
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44 */ |
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45 public class GFIServiceImpl |
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46 extends RemoteServiceServlet |
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47 implements GFIService |
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48 { |
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49 public static final String ERR_NO_VALID_GFI_URL = |
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50 "error_no_valid_gfi_url"; |
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51 |
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52 public static final String ERR_GFI_REQUEST_FAILED = |
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53 "error_gfi_req_failed"; |
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54 |
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55 public static final String ERR_PARSING_RESPONSE_FAILED = |
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56 "error_gfi_parsing_failed"; |
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57 |
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58 |
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59 private static final Logger log = |
9726 | 60 LogManager.getLogger(GFIServiceImpl.class); |
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61 |
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62 |
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63 /** |
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64 * @param theme |
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65 * @param format |
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66 * @param bbox |
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67 * @param height |
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68 * @param width |
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69 * @param x |
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70 * @param y |
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71 * |
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72 * @return |
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73 */ |
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74 public FeatureInfoResponse query( |
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75 Theme theme, |
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76 String format, |
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77 String bbox, |
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78 String projection, |
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79 int height, |
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80 int width, |
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81 int x, |
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82 int y |
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83 ) throws ServerException |
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84 { |
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85 log.info("GFIServiceImpl.query"); |
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86 |
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87 String path = createGetFeautureInfoURL( |
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88 theme, format, bbox, projection, height, width, x, y); |
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89 |
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90 log.debug("URL=" + path); |
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91 |
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92 try { |
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93 URL url = new URL(path); |
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94 |
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95 URLConnection conn = url.openConnection(); |
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96 conn.connect(); |
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97 |
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98 InputStream is = conn.getInputStream(); |
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99 |
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100 return parseResponse(is); |
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101 |
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102 } |
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103 catch (IOException ioe) { |
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104 log.warn(ioe, ioe); |
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105 } |
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106 |
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107 throw new ServerException(ERR_GFI_REQUEST_FAILED); |
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108 } |
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109 |
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110 |
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111 /** |
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112 * @param map |
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113 * @param theme |
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114 * @param format |
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115 * @param x |
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116 * @param y |
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117 * |
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118 * @return |
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119 */ |
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120 protected String createGetFeautureInfoURL( |
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121 Theme theme, |
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122 String infoFormat, |
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123 String bbox, |
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124 String projection, |
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125 int height, |
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126 int width, |
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127 int x, |
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128 int y |
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129 ) throws ServerException |
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130 { |
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131 String url = getUrl(theme); |
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132 |
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133 if (url == null || url.length() == 0) { |
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134 throw new ServerException(ERR_NO_VALID_GFI_URL); |
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135 } |
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136 |
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137 String layers = ((AttributedTheme)theme).getAttr("layers"); |
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138 |
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139 StringBuilder sb = new StringBuilder(); |
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140 sb.append(url); |
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141 |
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142 if (url.indexOf("?") < 0) { |
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143 sb.append("?SERVICE=WMS"); |
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144 } |
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145 else { |
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146 sb.append("&SERVICE=WMS"); |
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147 } |
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148 |
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149 sb.append("&VERSION=1.1.1"); |
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150 sb.append("&REQUEST=GetFeatureInfo"); |
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151 sb.append("&LAYERS=" + layers); |
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152 sb.append("&QUERY_LAYERS=" + layers); |
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153 sb.append("&BBOX=" + bbox); |
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154 sb.append("&HEIGHT=" + height); |
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155 sb.append("&WIDTH=" + width); |
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156 sb.append("&FORMAT=image/png"); |
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157 sb.append("&INFO_FORMAT=" + infoFormat); |
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158 sb.append("&SRS=" + projection); |
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159 sb.append("&X=" + String.valueOf(x)); |
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160 sb.append("&Y=" + String.valueOf(y)); |
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161 |
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162 return sb.toString(); |
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163 } |
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164 |
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165 |
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166 protected String getUrl(Theme theme) { |
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167 AttributedTheme attr = (AttributedTheme) theme; |
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168 return attr.getAttr("url"); |
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169 } |
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170 |
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171 |
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172 protected FeatureInfoResponse parseResponse(InputStream is) { |
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173 log.debug("GFIServiceImpl.parseResponse"); |
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174 |
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175 ByteArrayOutputStream baos = new ByteArrayOutputStream(); |
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176 byte [] buf = new byte[1024]; |
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177 |
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178 int r = -1; |
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179 try { |
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180 while ((r = is.read(buf)) >= 0) { |
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181 baos.write(buf, 0, r); |
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182 } |
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183 } catch (IOException ex) { |
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184 log.warn("GetFeatureInfo response could not be read: ", ex); |
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185 return new FeatureInfoResponse(); |
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186 } |
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187 |
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188 String content; |
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189 try { |
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190 content = baos.toString("UTF-8"); |
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191 } |
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192 catch (UnsupportedEncodingException uee) { |
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193 content = baos.toString(); |
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194 } |
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195 |
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196 Document response = XMLUtils.parseDocument(content); |
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197 if (response != null) { |
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198 List<FeatureInfo> features = new ArrayList<FeatureInfo>(); |
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199 parseFeatureInfos(response, features); |
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200 return new FeatureInfoResponse(features, null); |
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201 } |
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202 // Unable to parse just return the response as is |
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203 return new FeatureInfoResponse(new ArrayList<FeatureInfo>(), content); |
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204 } |
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205 |
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206 |
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207 protected void parseFeatureInfos(Node node, List<FeatureInfo> features) { |
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208 log.debug("GFIServiceImpl.parseFeatureInfos"); |
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209 |
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210 String name = node.getNodeName(); |
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211 |
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212 if (name.endsWith("_layer")) { |
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213 features.add(parseFeature(node)); |
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214 |
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215 return; |
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216 } |
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217 |
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218 NodeList children = node.getChildNodes(); |
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219 |
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220 if (children != null && children.getLength() > 0) { |
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221 for (int i = 0, n = children.getLength(); i < n; i++) { |
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222 parseFeatureInfos(children.item(i), features); |
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223 } |
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224 } |
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225 } |
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226 |
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227 |
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228 protected FeatureInfo parseFeature(Node node) { |
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229 log.debug("GFIServiceImpl.parseFeature"); |
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230 |
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231 String layername = node.getNodeName(); |
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232 |
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233 FeatureInfo f = new FeatureInfo(layername); |
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234 |
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235 NodeList children = node.getChildNodes(); |
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236 int numChildren = children != null ? children.getLength() : 0; |
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237 |
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238 log.debug("Feature '" + layername + "' has " + numChildren + " nodes."); |
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239 |
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240 for (int i = 0; i < numChildren; i++) { |
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241 Node tmp = children.item(i); |
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242 String nodeName = tmp.getNodeName(); |
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243 |
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244 log.debug(" node name: '" + nodeName + "'"); |
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245 |
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246 if (nodeName.equals("gml:name")) { |
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248 + tmp.getFirstChild().getNodeValue()); | |
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249 f.setLayername(tmp.getFirstChild().getNodeValue()); |
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250 } |
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251 else if (nodeName.endsWith("_feature")) { |
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252 parseFeatureAttributes(tmp, f); |
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253 } |
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254 } |
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255 |
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256 return f; |
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257 } |
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258 |
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259 |
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260 protected void parseFeatureAttributes(Node node, FeatureInfo f) { |
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261 log.debug("GFIServiceImpl.parseFeatureAttributes"); |
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262 |
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263 NodeList children = node.getChildNodes(); |
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264 int numChildren = children != null ? children.getLength() : 0; |
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265 |
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266 log.debug("Has " + numChildren + " attributes."); |
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267 |
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268 for (int i = 0; i < numChildren; i++) { |
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269 Node tmp = children.item(i); |
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270 String name = tmp.getNodeName(); |
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271 |
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272 log.debug(" tmp attribute name: '" + name + "'"); |
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273 |
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274 if (name.equals("gml:boundedBy")) { |
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275 // TODO |
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276 } |
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277 else { |
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278 Node child = tmp.getFirstChild(); |
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279 if (child != null) { |
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280 f.addAttr(name, child.getNodeValue()); |
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281 } |
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282 } |
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283 } |
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284 } |
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285 } |
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286 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 : |