Mercurial > dive4elements > river
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> |
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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.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents:
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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 : |