Mercurial > dive4elements > river

annotate flys-artifacts/src/main/java/de/intevation/flys/utils/GeometryUtils.java @ 1137:073c36bb94ed

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Minor cosmetics flys-artifacts/trunk@2658 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Felix Wolfsteller <felix.wolfsteller@intevation.de>
date Wed, 07 Sep 2011 07:37:22 +0000
parents 66783d957201
children c07e9e9c7482
rev   line source
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eeebf8514c7f The boundary (extent) for the river axis is determined based on its geometry - this extent is written into the wms facet.
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1 package de.intevation.flys.utils;
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2
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3 import java.io.IOException;
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4 import java.io.File;
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5 import java.io.Serializable;
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6 import java.net.MalformedURLException;
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7 import java.util.ArrayList;
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8 import java.util.HashMap;
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9 import java.util.List;
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10 import java.util.Map;
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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.vividsolutions.jts.geom.Coordinate;
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15 import com.vividsolutions.jts.geom.Geometry;
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16
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17 import org.opengis.feature.simple.SimpleFeature;
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18 import org.opengis.feature.simple.SimpleFeatureType;
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19 import org.opengis.referencing.FactoryException;
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20 import org.opengis.referencing.NoSuchAuthorityCodeException;
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21 import org.opengis.referencing.crs.CoordinateReferenceSystem;
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22
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23 import org.geotools.data.DataStoreFactorySpi;
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24 import org.geotools.data.FeatureStore;
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25 import org.geotools.data.DefaultTransaction;
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26 import org.geotools.data.Transaction;
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27 import org.geotools.data.shapefile.ShapefileDataStore;
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28 import org.geotools.data.shapefile.ShapefileDataStoreFactory;
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29 import org.geotools.feature.FeatureIterator;
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30 import org.geotools.feature.FeatureCollection;
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31 import org.geotools.feature.simple.SimpleFeatureTypeBuilder;
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32 import org.geotools.geojson.feature.FeatureJSON;
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33 import org.geotools.referencing.CRS;
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34
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35
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36 public class GeometryUtils {
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37
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38 private static final Logger logger = Logger.getLogger(GeometryUtils.class);
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39
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40
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41 private GeometryUtils() {
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42 }
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43
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44
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45 /**
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46 * Returns the boundary of Geometry <i>geom</i> in OpenLayers
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47 * representation.
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48 *
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49 * @param geom The geometry.
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50 *
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51 * @return the OpenLayers boundary of <i>geom</i>.
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52 */
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53 public static String jtsBoundsToOLBounds(Geometry geom) {
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54 Coordinate[] c = geom != null ? geom.getCoordinates() : null;
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55
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56 if (c == null || c.length < 2) {
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57 return null;
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58 }
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59
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60 return "" + c[0].x + " " + c[1].y + " " + c[1].x + " " + c[0].y;
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61 }
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62
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63
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64 public static SimpleFeatureType buildFeatureType(
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65 String name, String srs, Class geometryType)
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66 {
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67 return buildFeatureType(name, srs, geometryType, null);
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68 }
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69
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70
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71 /**
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72 * Creates a new SimpleFeatureType using a SimpleFeatureTypeBuilder.
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73 *
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74 * @param name The name of the FeatureType.
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75 * @param srs The SRS (e.g. "EPSG:31466").
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76 * @param geometryType The geometry type's class (e.g. Polygon.class).
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77 * @param attrs Optional. An object with attribute-name/attribute-class
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78 * pairs where index 0 specifies the name as string and index 1 the type
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79 * as class.
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80 *
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81 * @return a new SimpleFeatureType.
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82 */
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83 public static SimpleFeatureType buildFeatureType(
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84 String name, String srs, Class geometryType, Object[][] attrs)
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85 {
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86 try {
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87 SimpleFeatureTypeBuilder builder = new SimpleFeatureTypeBuilder();
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88 CoordinateReferenceSystem crs = CRS.decode(srs);
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89
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90 builder.setName("flys");
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91 builder.setNamespaceURI("http://www.intevation.de/");
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92 builder.setCRS(crs);
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93 builder.setSRS(srs);
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94
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95 builder.add("geometry", geometryType, crs);
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96
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97 if (attrs != null) {
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98 for (Object[] attr: attrs) {
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99 builder.add((String) attr[0], (Class) attr[1]);
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100 }
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101 }
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102
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103 return builder.buildFeatureType();
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104 }
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105 catch (NoSuchAuthorityCodeException nsae) {
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106 }
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107 catch (FactoryException fe) {
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108 }
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109
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110 return null;
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111 }
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112
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113
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114 public static List<SimpleFeature> parseGeoJSON(
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115 String geojson, SimpleFeatureType ft
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116 ) {
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117 List<SimpleFeature> collection = new ArrayList<SimpleFeature>();
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118
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119 try {
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120 FeatureJSON fjson = new FeatureJSON();
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121 fjson.setFeatureType(ft);
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122
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123 FeatureIterator<SimpleFeature> iterator =
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124 fjson.streamFeatureCollection(geojson);
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125
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126 while (iterator.hasNext()) {
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127 collection.add(iterator.next());
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128 }
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129 }
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130 catch (IOException ioe) {
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131 // TODO handle exception
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132 }
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133
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134 return collection;
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135 }
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136
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137
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138 public static boolean writeShapefile(
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139 File shape,
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140 SimpleFeatureType featureType,
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141 FeatureCollection collection
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142 ) {
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143 Transaction transaction = null;
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144
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145 try {
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146 Map<String, Serializable> params =
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147 new HashMap<String, Serializable>();
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148
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149 params.put("url", shape.toURI().toURL());
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150 params.put("create spatial index", Boolean.TRUE);
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151
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152 DataStoreFactorySpi dataStoreFactory =
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153 new ShapefileDataStoreFactory();
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154
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155 ShapefileDataStore newDataStore =
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156 (ShapefileDataStore)dataStoreFactory.createNewDataStore(params);
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157 newDataStore.createSchema(featureType);
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158
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159 transaction = new DefaultTransaction("create");
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160
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161 String typeName = newDataStore.getTypeNames()[0];
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162
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163 FeatureStore<SimpleFeatureType, SimpleFeature> featureStore =
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164 (FeatureStore<SimpleFeatureType, SimpleFeature>)
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165 newDataStore.getFeatureSource(typeName);
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166
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167 featureStore.setTransaction(transaction);
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168
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169 featureStore.addFeatures(collection);
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170 transaction.commit();
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171
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172 return true;
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173 }
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174 catch (MalformedURLException mue) {
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175 logger.error("Unable to prepare shapefile: " + mue.getMessage());
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176 }
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177 catch (IOException ioe) {
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178 logger.error("Unable to write shapefile: " + ioe.getMessage());
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179 }
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180 finally {
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181 if (transaction != null) {
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182 try {
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183 logger.debug("XXX CLOSE TRANSACTION!");
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184 transaction.close();
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185 }
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186 catch (IOException ioe) { /* do nothing */ }
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187 }
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188 }
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189
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190 return false;
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191 }
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192 }
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193 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org