annotate flys-client/src/main/java/de/intevation/flys/client/server/GFIServiceImpl.java @ 1400:96708d81eaf6

Added an initial GetFeatureInfo tool to get information about points in the map. flys-client/trunk@3285 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Ingo Weinzierl <ingo.weinzierl@intevation.de>
date Thu, 17 Nov 2011 16:20:55 +0000
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children 15ef3d3081b7
rev   line source
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96708d81eaf6 Added an initial GetFeatureInfo tool to get information about points in the map.
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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.List;
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11
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12 import org.apache.log4j.Logger;
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13
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14 import com.google.gwt.user.server.rpc.RemoteServiceServlet;
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15
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16
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17 import de.intevation.flys.client.shared.exceptions.ServerException;
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18 import de.intevation.flys.client.shared.model.AttributedTheme;
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19 import de.intevation.flys.client.shared.model.Theme;
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20
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21 import de.intevation.flys.client.client.services.GFIService;
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22
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23
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24 /**
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25 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
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26 */
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27 public class GFIServiceImpl
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28 extends RemoteServiceServlet
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29 implements GFIService
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30 {
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31 public static final String ERR_NO_VALID_GFI_URL =
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32 "error_no_valid_gfi_url";
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33
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34 public static final String ERR_GFI_REQUEST_FAILED =
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35 "error_gfi_req_failed";
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36
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37 public static final String ERR_PARSING_RESPONSE_FAILED =
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38 "error_gfi_parsing_failed";
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39
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40
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41 private static final Logger logger =
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42 Logger.getLogger(GFIServiceImpl.class);
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43
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44
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45 /**
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46 * @param themes
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47 * @param format
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48 * @param bbox
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49 * @param height
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50 * @param width
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51 * @param x
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52 * @param y
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53 *
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54 * @return
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55 */
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56 public String query(
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57 List<Theme> themes,
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58 String format,
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59 String bbox,
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60 String projection,
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61 int height,
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62 int width,
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63 int x,
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64 int y
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65 ) throws ServerException
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66 {
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67 logger.info("GFIServiceImpl.query");
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68
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69 String path = createGetFeautureInfoURL(
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70 themes, format, bbox, projection, height, width, x, y);
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71 logger.debug("URL=" + path);
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72
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73 try {
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74 URL url = new URL(path);
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75
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76 URLConnection conn = url.openConnection();
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77 conn.connect();
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78
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79 InputStream is = conn.getInputStream();
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80
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81 return getResponseText(is);
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82
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83 }
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84 catch (IOException ioe) {
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85 logger.warn(ioe, ioe);
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86 }
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87
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88 throw new ServerException(ERR_GFI_REQUEST_FAILED);
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89 }
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90
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91
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92 protected String getResponseText(InputStream is)
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93 throws ServerException {
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94 BufferedReader reader = null;
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95 StringWriter writer = new StringWriter();
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96
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97 try {
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98 reader = new BufferedReader(new InputStreamReader(is));
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99
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100 String line = null;
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101
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102 if (reader.ready()) {
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103 while ((line = reader.readLine()) != null) {
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104 String test = line.trim();
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105 if (test.startsWith("<") && !test.startsWith("</")
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106 && test.indexOf("_feature") > 0)
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107 {
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108 writer.append("<gml:featureMember>");
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109 }
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110 writer.append(line);
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111
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112 if (test.startsWith("</") && test.indexOf("_feature") > 0) {
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113 writer.append("</gml:featureMember>");
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114 }
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115 }
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116 }
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117 }
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118 catch (IOException ioe) {
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119 logger.warn(ioe, ioe);
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120 throw new ServerException(ERR_PARSING_RESPONSE_FAILED);
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121 }
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122 finally {
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123 if (reader != null) {
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124 try {
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125 reader.close();
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126 }
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127 catch (IOException ioe) {
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128 // do nothing here
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129 }
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130 }
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131 }
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132
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133 return writer.toString();
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134 }
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135
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136
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137 /**
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138 * @param map
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139 * @param themes
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140 * @param format
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141 * @param x
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142 * @param y
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143 *
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144 * @return
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145 */
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146 protected String createGetFeautureInfoURL(
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147 List<Theme> themes,
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148 String infoFormat,
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149 String bbox,
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150 String projection,
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151 int height,
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152 int width,
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153 int x,
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154 int y
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155 ) throws ServerException
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156 {
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157 String url = getUrl(themes);
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158
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159 if (url == null || url.length() == 0) {
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160 throw new ServerException(ERR_NO_VALID_GFI_URL);
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161 }
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162
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163 String layers = createLayersString(themes);
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164
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165 StringBuilder sb = new StringBuilder();
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166 sb.append(url);
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167
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168 if (url.indexOf("?") < 0) {
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169 sb.append("?SERVICE=WMS");
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170 }
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171 else {
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172 sb.append("&SERVICE=WMS");
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173 }
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174
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175 sb.append("&VERSION=1.1.1");
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176 sb.append("&REQUEST=GetFeatureInfo");
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177 sb.append("&LAYERS=" + layers);
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178 sb.append("&QUERY_LAYERS=" + layers);
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179 sb.append("&BBOX=" + bbox);
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180 sb.append("&HEIGHT=" + height);
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181 sb.append("&WIDTH=" + width);
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182 sb.append("&FORMAT=image/png");
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183 sb.append("&INFO_FORMAT=" + infoFormat);
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184 sb.append("&SRS=" + projection);
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185 sb.append("&X=" + String.valueOf(x));
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186 sb.append("&Y=" + String.valueOf(y));
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187
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188 return sb.toString();
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189 }
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190
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191
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192 protected String getUrl(List<Theme> themes) {
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193 for (Theme t: themes) {
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194 AttributedTheme attr = (AttributedTheme) t;
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195
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196 if (attr.getAttrAsBoolean("queryable")) {
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197 return attr.getAttr("url");
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198 }
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199 }
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200
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201 return null;
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202 }
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203
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204
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205 protected String createLayersString(List<Theme> themes) {
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206 StringBuilder sb = new StringBuilder();
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207 boolean first = true;
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208
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209 for (Theme theme: themes) {
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210 if (!first) {
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211 sb.append(",");
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212 }
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213
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214 AttributedTheme layer = (AttributedTheme) theme;
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215 if (layer.getAttrAsBoolean("queryable")) {
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216 sb.append(layer.getAttr("layers"));
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217 first = false;
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218 }
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219 }
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220
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221 return sb.toString();
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222 }
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223 }
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224 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :

http://dive4elements.wald.intevation.org