Mercurial > dive4elements > river

annotate flys-client/src/main/java/de/intevation/flys/client/server/GFIServiceImpl.java @ 1402:15ef3d3081b7

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Parse GetFeatureInfo response on our own and display resulting FeatureInfo objects in the GetFeatureInfoWindow. flys-client/trunk@3287 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Ingo Weinzierl <ingo.weinzierl@intevation.de>
date Fri, 18 Nov 2011 11:39:10 +0000
parents 96708d81eaf6
children 442ce7d6bc39
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.BufferedReader;
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4 import java.io.InputStream;
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5 import java.io.InputStreamReader;
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6 import java.io.IOException;
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7 import java.io.StringWriter;
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8 import java.net.URL;
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9 import java.net.URLConnection;
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10 import java.util.ArrayList;
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11 import java.util.List;
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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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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.Theme;
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27
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28 import de.intevation.flys.client.client.services.GFIService;
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29
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30
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31 /**
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32 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
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33 */
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34 public class GFIServiceImpl
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35 extends RemoteServiceServlet
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36 implements GFIService
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37 {
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38 public static final String ERR_NO_VALID_GFI_URL =
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39 "error_no_valid_gfi_url";
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40
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41 public static final String ERR_GFI_REQUEST_FAILED =
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42 "error_gfi_req_failed";
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43
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44 public static final String ERR_PARSING_RESPONSE_FAILED =
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45 "error_gfi_parsing_failed";
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46
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47
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48 private static final Logger logger =
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49 Logger.getLogger(GFIServiceImpl.class);
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50
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51
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52 /**
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53 * @param themes
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54 * @param format
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55 * @param bbox
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56 * @param height
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57 * @param width
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58 * @param x
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59 * @param y
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60 *
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61 * @return
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62 */
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63 public List<FeatureInfo> query(
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64 List<Theme> themes,
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65 String format,
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66 String bbox,
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67 String projection,
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68 int height,
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69 int width,
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70 int x,
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71 int y
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72 ) throws ServerException
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73 {
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74 logger.info("GFIServiceImpl.query");
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75
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76 String path = createGetFeautureInfoURL(
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77 themes, format, bbox, projection, height, width, x, y);
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78
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79 logger.debug("URL=" + path);
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80
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81 try {
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82 URL url = new URL(path);
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83
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84 URLConnection conn = url.openConnection();
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85 conn.connect();
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86
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87 InputStream is = conn.getInputStream();
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88
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89 return parseResponse(is);
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90
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91 }
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92 catch (IOException ioe) {
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93 logger.warn(ioe, ioe);
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94 }
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95
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96 throw new ServerException(ERR_GFI_REQUEST_FAILED);
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97 }
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98
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99
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100 /**
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101 * @param map
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102 * @param themes
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103 * @param format
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104 * @param x
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105 * @param y
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106 *
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107 * @return
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108 */
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109 protected String createGetFeautureInfoURL(
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110 List<Theme> themes,
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111 String infoFormat,
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112 String bbox,
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113 String projection,
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114 int height,
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115 int width,
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116 int x,
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117 int y
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118 ) throws ServerException
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119 {
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120 String url = getUrl(themes);
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121
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122 if (url == null || url.length() == 0) {
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123 throw new ServerException(ERR_NO_VALID_GFI_URL);
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124 }
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125
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126 String layers = createLayersString(themes);
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127
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128 StringBuilder sb = new StringBuilder();
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129 sb.append(url);
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130
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131 if (url.indexOf("?") < 0) {
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132 sb.append("?SERVICE=WMS");
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133 }
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134 else {
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135 sb.append("&SERVICE=WMS");
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136 }
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137
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138 sb.append("&VERSION=1.1.1");
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139 sb.append("&REQUEST=GetFeatureInfo");
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140 sb.append("&LAYERS=" + layers);
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141 sb.append("&QUERY_LAYERS=" + layers);
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142 sb.append("&BBOX=" + bbox);
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143 sb.append("&HEIGHT=" + height);
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144 sb.append("&WIDTH=" + width);
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145 sb.append("&FORMAT=image/png");
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146 sb.append("&INFO_FORMAT=" + infoFormat);
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147 sb.append("&SRS=" + projection);
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148 sb.append("&X=" + String.valueOf(x));
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149 sb.append("&Y=" + String.valueOf(y));
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150
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151 return sb.toString();
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152 }
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153
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154
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155 protected String getUrl(List<Theme> themes) {
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156 for (Theme t: themes) {
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157 AttributedTheme attr = (AttributedTheme) t;
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158
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159 if (attr.getAttrAsBoolean("queryable")) {
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160 return attr.getAttr("url");
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161 }
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162 }
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163
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164 return null;
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165 }
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166
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167
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168 protected String createLayersString(List<Theme> themes) {
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169 StringBuilder sb = new StringBuilder();
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170 boolean first = true;
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171
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172 for (Theme theme: themes) {
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173 if (!first) {
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174 sb.append(",");
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175 }
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176
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177 AttributedTheme layer = (AttributedTheme) theme;
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178 if (layer.getAttrAsBoolean("queryable")) {
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179 sb.append(layer.getAttr("layers"));
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180 first = false;
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181 }
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182 }
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183
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184 return sb.toString();
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185 }
1402
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186
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187
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188 protected List<FeatureInfo> parseResponse(InputStream is) {
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189 logger.debug("GFIServiceImpl.parseResponse");
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190
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191 Document response = XMLUtils.parseDocument(is);
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192
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193 List<FeatureInfo> features = new ArrayList<FeatureInfo>();
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194
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195 parseFeatureInfos(response, features);
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196
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197 return features;
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198 }
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199
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200
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201 protected void parseFeatureInfos(Node node, List<FeatureInfo> features) {
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202 logger.debug("GFIServiceImpl.parseFeatureInfos");
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203
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204 String name = node.getNodeName();
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205
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206 if (name.endsWith("_layer")) {
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207 features.add(parseFeature(node));
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208
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diff changeset
209 return;
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210 }
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211
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212 NodeList children = node.getChildNodes();
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213
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214 if (children != null && children.getLength() > 0) {
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215 for (int i = 0, n = children.getLength(); i < n; i++) {
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216 parseFeatureInfos(children.item(i), features);
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217 }
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218 }
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219 }
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220
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221
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222 protected FeatureInfo parseFeature(Node node) {
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223 logger.debug("GFIServiceImpl.parseFeature");
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224
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225 String layername = node.getNodeName();
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226
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227 FeatureInfo f = new FeatureInfo(layername);
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228
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229 NodeList children = node.getChildNodes();
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230 int numChildren = children != null ? children.getLength() : 0;
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231
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diff changeset
232 logger.debug("Feature '" + layername + "' has " + numChildren + " nodes.");
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233
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234 for (int i = 0; i < numChildren; i++) {
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235 Node tmp = children.item(i);
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236 String nodeName = tmp.getNodeName();
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237
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238 logger.debug(" node name: '" + nodeName + "'");
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239
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240 if (nodeName.equals("gml:name")) {
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241 logger.debug("NAME node has child: " + tmp.getFirstChild().getNodeValue());
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242 f.setLayername(tmp.getFirstChild().getNodeValue());
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243 }
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244 else if (nodeName.endsWith("_feature")) {
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245 parseFeatureAttributes(tmp, f);
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246 }
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247 }
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248
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249 return f;
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250 }
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251
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252
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253 protected void parseFeatureAttributes(Node node, FeatureInfo f) {
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254 logger.debug("GFIServiceImpl.parseFeatureAttributes");
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255
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256 NodeList children = node.getChildNodes();
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257 int numChildren = children != null ? children.getLength() : 0;
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258
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259 logger.debug("Has " + numChildren + " attributes.");
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260
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261 for (int i = 0; i < numChildren; i++) {
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262 Node tmp = children.item(i);
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263 String name = tmp.getNodeName();
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264
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265 logger.debug(" tmp attribute name: '" + name + "'");
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266
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267 if (name.equals("gml:boundedBy")) {
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268 // TODO
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269 }
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270 else {
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271 Node child = tmp.getFirstChild();
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272 if (child != null) {
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273 f.addAttr(name, child.getNodeValue());
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274 }
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275 }
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276 }
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277 }
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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278 }
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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279 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org