Mercurial > dive4elements > river

annotate flys-client/src/main/java/de/intevation/flys/client/server/GFIServiceImpl.java @ 3497:88feb3347aa5

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Implement a ProxyServlet Implement a ProxyServlet to be able to restrict the access to the mapserver too. All queries to the provided map services should go throught this new ProxyServlet. Currently the ProxyServlet can only handle HTTP GET requests. flys-client/trunk@5221 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Bjoern Ricks <bjoern.ricks@intevation.de>
date Thu, 16 Aug 2012 14:42:36 +0000
parents 30c7f8f9f1b7
children af2aa716152f
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.IOException;
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5 import java.net.URL;
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6 import java.net.URLConnection;
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7 import java.util.ArrayList;
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8 import java.util.List;
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9
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10 import org.w3c.dom.Document;
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11 import org.w3c.dom.Node;
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12 import org.w3c.dom.NodeList;
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13
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14 import org.apache.log4j.Logger;
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15
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16 import com.google.gwt.user.server.rpc.RemoteServiceServlet;
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17
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18 import de.intevation.artifacts.common.utils.XMLUtils;
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19
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20 import de.intevation.flys.client.shared.exceptions.ServerException;
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21 import de.intevation.flys.client.shared.model.AttributedTheme;
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22 import de.intevation.flys.client.shared.model.FeatureInfo;
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23 import de.intevation.flys.client.shared.model.Theme;
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25 import de.intevation.flys.client.client.services.GFIService;
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27
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28 /**
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29 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
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30 */
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31 public class GFIServiceImpl
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32 extends RemoteServiceServlet
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33 implements GFIService
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34 {
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35 public static final String ERR_NO_VALID_GFI_URL =
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36 "error_no_valid_gfi_url";
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37
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38 public static final String ERR_GFI_REQUEST_FAILED =
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39 "error_gfi_req_failed";
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40
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41 public static final String ERR_PARSING_RESPONSE_FAILED =
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42 "error_gfi_parsing_failed";
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44
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45 private static final Logger logger =
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46 Logger.getLogger(GFIServiceImpl.class);
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47
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48
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49 /**
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50 * @param themes
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51 * @param format
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52 * @param bbox
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53 * @param height
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54 * @param width
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55 * @param x
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56 * @param y
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57 *
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58 * @return
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59 */
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60 public List<FeatureInfo> query(
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61 List<Theme> themes,
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62 String format,
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63 String bbox,
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64 String projection,
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65 int height,
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66 int width,
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67 int x,
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68 int y
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69 ) throws ServerException
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70 {
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71 logger.info("GFIServiceImpl.query");
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72
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73 String path = createGetFeautureInfoURL(
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74 themes, format, bbox, projection, height, width, x, y);
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75
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76 logger.debug("URL=" + path);
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77
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78 try {
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79 URL url = new URL(path);
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80
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81 URLConnection conn = url.openConnection();
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82 conn.connect();
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83
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84 InputStream is = conn.getInputStream();
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85
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86 return parseResponse(is);
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87
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88 }
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89 catch (IOException ioe) {
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90 logger.warn(ioe, ioe);
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91 }
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92
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93 throw new ServerException(ERR_GFI_REQUEST_FAILED);
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94 }
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95
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96
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97 /**
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98 * @param map
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99 * @param themes
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100 * @param format
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101 * @param x
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102 * @param y
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103 *
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104 * @return
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105 */
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106 protected String createGetFeautureInfoURL(
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107 List<Theme> themes,
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108 String infoFormat,
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109 String bbox,
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110 String projection,
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111 int height,
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112 int width,
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113 int x,
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114 int y
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115 ) throws ServerException
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116 {
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117 String url = getUrl(themes);
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118
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119 if (url == null || url.length() == 0) {
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120 throw new ServerException(ERR_NO_VALID_GFI_URL);
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121 }
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122
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123 String layers = createLayersString(themes);
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124
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125 StringBuilder sb = new StringBuilder();
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126 sb.append(url);
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127
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128 if (url.indexOf("?") < 0) {
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129 sb.append("?SERVICE=WMS");
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130 }
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131 else {
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132 sb.append("&SERVICE=WMS");
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133 }
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134
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135 sb.append("&VERSION=1.1.1");
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136 sb.append("&REQUEST=GetFeatureInfo");
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137 sb.append("&LAYERS=" + layers);
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138 sb.append("&QUERY_LAYERS=" + layers);
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139 sb.append("&BBOX=" + bbox);
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140 sb.append("&HEIGHT=" + height);
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141 sb.append("&WIDTH=" + width);
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142 sb.append("&FORMAT=image/png");
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143 sb.append("&INFO_FORMAT=" + infoFormat);
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144 sb.append("&SRS=" + projection);
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145 sb.append("&X=" + String.valueOf(x));
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146 sb.append("&Y=" + String.valueOf(y));
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147
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148 return sb.toString();
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149 }
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150
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151
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152 protected String getUrl(List<Theme> themes) {
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153 for (Theme t: themes) {
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154 AttributedTheme attr = (AttributedTheme) t;
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155
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156 if (attr.getAttrAsBoolean("queryable")) {
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157 return attr.getAttr("url");
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158 }
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159 }
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160
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161 return null;
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162 }
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163
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164
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165 protected String createLayersString(List<Theme> themes) {
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166 StringBuilder sb = new StringBuilder();
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167 boolean first = true;
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168
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169 for (Theme theme: themes) {
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170 AttributedTheme layer = (AttributedTheme) theme;
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171 if (layer.getAttrAsBoolean("queryable")) {
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172 if (!first) {
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173 sb.append(",");
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174 }
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175
1400
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176 sb.append(layer.getAttr("layers"));
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177 first = false;
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178 }
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179 }
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180
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181 return sb.toString();
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182 }
1402
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183
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184
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185 protected List<FeatureInfo> parseResponse(InputStream is) {
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186 logger.debug("GFIServiceImpl.parseResponse");
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187
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188 Document response = XMLUtils.parseDocument(is);
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189
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190 List<FeatureInfo> features = new ArrayList<FeatureInfo>();
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191
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192 parseFeatureInfos(response, features);
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193
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194 return features;
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195 }
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196
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197
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198 protected void parseFeatureInfos(Node node, List<FeatureInfo> features) {
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199 logger.debug("GFIServiceImpl.parseFeatureInfos");
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200
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201 String name = node.getNodeName();
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202
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203 if (name.endsWith("_layer")) {
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204 features.add(parseFeature(node));
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205
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206 return;
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207 }
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208
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209 NodeList children = node.getChildNodes();
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210
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diff changeset
211 if (children != null && children.getLength() > 0) {
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212 for (int i = 0, n = children.getLength(); i < n; i++) {
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213 parseFeatureInfos(children.item(i), features);
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214 }
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215 }
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216 }
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217
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218
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219 protected FeatureInfo parseFeature(Node node) {
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220 logger.debug("GFIServiceImpl.parseFeature");
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221
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222 String layername = node.getNodeName();
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223
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224 FeatureInfo f = new FeatureInfo(layername);
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225
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226 NodeList children = node.getChildNodes();
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227 int numChildren = children != null ? children.getLength() : 0;
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228
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229 logger.debug("Feature '" + layername + "' has " + numChildren + " nodes.");
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230
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231 for (int i = 0; i < numChildren; i++) {
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232 Node tmp = children.item(i);
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233 String nodeName = tmp.getNodeName();
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234
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235 logger.debug(" node name: '" + nodeName + "'");
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236
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237 if (nodeName.equals("gml:name")) {
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238 logger.debug("NAME node has child: " + tmp.getFirstChild().getNodeValue());
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diff changeset
239 f.setLayername(tmp.getFirstChild().getNodeValue());
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240 }
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241 else if (nodeName.endsWith("_feature")) {
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242 parseFeatureAttributes(tmp, f);
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243 }
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244 }
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245
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246 return f;
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247 }
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248
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249
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250 protected void parseFeatureAttributes(Node node, FeatureInfo f) {
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251 logger.debug("GFIServiceImpl.parseFeatureAttributes");
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252
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253 NodeList children = node.getChildNodes();
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254 int numChildren = children != null ? children.getLength() : 0;
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255
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256 logger.debug("Has " + numChildren + " attributes.");
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257
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258 for (int i = 0; i < numChildren; i++) {
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259 Node tmp = children.item(i);
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260 String name = tmp.getNodeName();
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261
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262 logger.debug(" tmp attribute name: '" + name + "'");
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263
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264 if (name.equals("gml:boundedBy")) {
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265 // TODO
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266 }
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267 else {
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268 Node child = tmp.getFirstChild();
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269 if (child != null) {
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270 f.addAttr(name, child.getNodeValue());
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271 }
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272 }
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273 }
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274 }
1400
96708d81eaf6 Added an initial GetFeatureInfo tool to get information about points in the map.
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parents:
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275 }
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276 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org