Mercurial > dive4elements > river

annotate flys-client/src/main/java/de/intevation/flys/client/server/GFIServiceImpl.java @ 2917:be99bf1aa59b

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Create simplified column filter. flys-client/trunk@4739 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Sascha L. Teichmann <sascha.teichmann@intevation.de>
date Thu, 21 Jun 2012 11:55:37 +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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24
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25 import de.intevation.flys.client.client.services.GFIService;
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26
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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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diff changeset
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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diff changeset
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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diff changeset
229 logger.debug("Feature '" + layername + "' has " + numChildren + " nodes.");
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230
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diff changeset
231 for (int i = 0; i < numChildren; i++) {
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diff changeset
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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diff changeset
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