Mercurial > dive4elements > river
annotate flys-artifacts/src/main/java/de/intevation/flys/utils/GeometryUtils.java @ 4851:a1ce76091ade
FLYSUtils: Made getLocations private, added TODO about resolution.
author | Felix Wolfsteller <felix.wolfsteller@intevation.de> |
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date | Wed, 23 Jan 2013 12:12:22 +0100 |
parents | 1b41dc00b1f7 |
children | c1b60f8c3390 |
rev | line source |
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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 com.vividsolutions.jts.geom.Coordinate; |
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4 import com.vividsolutions.jts.geom.Envelope; |
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5 import com.vividsolutions.jts.geom.Geometry; |
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6 |
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7 import de.intevation.flys.model.RiverAxis; |
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8 |
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9 import java.io.File; |
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10 import java.io.IOException; |
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11 import java.io.Serializable; |
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12 import java.net.MalformedURLException; |
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13 import java.util.ArrayList; |
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14 import java.util.HashMap; |
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15 import java.util.List; |
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16 import java.util.Map; |
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17 |
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18 import org.apache.log4j.Logger; |
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19 import org.geotools.data.DataStoreFactorySpi; |
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20 import org.geotools.data.DefaultTransaction; |
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21 import org.geotools.data.FeatureWriter; |
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22 import org.geotools.data.Transaction; |
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23 import org.geotools.data.shapefile.ShapefileDataStore; |
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24 import org.geotools.data.shapefile.ShapefileDataStoreFactory; |
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25 import org.geotools.data.simple.SimpleFeatureIterator; |
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26 import org.geotools.feature.FeatureCollection; |
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27 import org.geotools.feature.FeatureIterator; |
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28 import org.geotools.feature.simple.SimpleFeatureTypeBuilder; |
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29 import org.geotools.geojson.feature.FeatureJSON; |
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30 import org.geotools.geometry.jts.JTS; |
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31 import org.geotools.geometry.jts.ReferencedEnvelope; |
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32 import org.geotools.referencing.CRS; |
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33 import org.opengis.feature.simple.SimpleFeature; |
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34 import org.opengis.feature.simple.SimpleFeatureType; |
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35 import org.opengis.referencing.FactoryException; |
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36 import org.opengis.referencing.NoSuchAuthorityCodeException; |
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37 import org.opengis.referencing.crs.CoordinateReferenceSystem; |
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38 import org.opengis.referencing.operation.MathTransform; |
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39 import org.opengis.referencing.operation.TransformException; |
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40 |
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41 public class GeometryUtils { |
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42 |
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43 private static final Logger logger = Logger.getLogger(GeometryUtils.class); |
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44 |
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45 public static final String PREFIX_EPSG = "EPSG:"; |
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46 |
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47 public static final String DEFAULT_EPSG = "EPSG:31467"; |
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48 |
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49 private GeometryUtils() { |
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50 } |
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51 |
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52 public static Envelope getRiverBoundary(String rivername) { |
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53 List<RiverAxis> axes = RiverAxis.getRiverAxis(rivername); |
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54 if (axes != null && axes.size() > 0) { |
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55 Envelope max = null; |
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56 |
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57 for (RiverAxis axis: axes) { |
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58 // TODO Take the correct EPSG into account. Maybe, we need to |
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59 // reproject the geometry. |
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60 Envelope env = axis.getGeom().getEnvelopeInternal(); |
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61 |
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62 if (max == null) { |
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63 max = env; |
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64 } |
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65 else { |
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66 max.expandToInclude(env); |
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67 } |
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68 } |
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69 |
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70 return max; |
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71 } |
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72 |
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73 return null; |
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74 } |
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parents:
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75 |
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76 public static String getRiverBounds(String rivername) { |
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77 Envelope env = getRiverBoundary(rivername); |
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78 |
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79 if (env != null) { |
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80 return jtsBoundsToOLBounds(env); |
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81 } |
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82 |
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83 return null; |
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84 } |
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85 |
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86 /** |
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87 * Returns the boundary of Envelope <i>env</i> in OpenLayers representation. |
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88 * |
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89 * @param env The envelope of a geometry. |
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90 * |
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91 * @return the OpenLayers boundary of <i>env</i>. |
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92 */ |
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93 public static String jtsBoundsToOLBounds(Envelope env) { |
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94 StringBuilder buf = new StringBuilder(); |
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95 buf.append(env.getMinX()); buf.append(' '); |
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96 buf.append(env.getMinY()); buf.append(' '); |
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97 buf.append(env.getMaxX()); buf.append(' '); |
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98 buf.append(env.getMaxY()); |
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99 return buf.toString(); |
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100 } |
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101 |
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102 public static String createOLBounds(Geometry a, Geometry b) { |
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103 Coordinate[] ca = a.getCoordinates(); |
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104 Coordinate[] cb = b.getCoordinates(); |
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105 |
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106 double lowerX = Double.MAX_VALUE; |
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107 double lowerY = Double.MAX_VALUE; |
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108 double upperX = -Double.MAX_VALUE; |
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109 double upperY = -Double.MAX_VALUE; |
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110 |
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111 for (Coordinate c: ca) { |
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112 lowerX = lowerX < c.x ? lowerX : c.x; |
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113 lowerY = lowerY < c.y ? lowerY : c.y; |
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114 |
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115 upperX = upperX > c.x ? upperX : c.x; |
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116 upperY = upperY > c.y ? upperY : c.y; |
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117 } |
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118 |
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119 for (Coordinate c: cb) { |
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120 lowerX = lowerX < c.x ? lowerX : c.x; |
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121 lowerY = lowerY < c.y ? lowerY : c.y; |
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122 |
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123 upperX = upperX > c.x ? upperX : c.x; |
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124 upperY = upperY > c.y ? upperY : c.y; |
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125 } |
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126 |
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127 return "" + lowerX + " " + lowerY + " " + upperX + " " + upperY; |
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128 } |
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129 |
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130 public static SimpleFeatureType buildFeatureType( |
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131 String name, String srs, Class<?> geometryType) |
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132 { |
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133 return buildFeatureType(name, srs, geometryType, null); |
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134 } |
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135 |
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136 /** |
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137 * Creates a new SimpleFeatureType using a SimpleFeatureTypeBuilder. |
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138 * |
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139 * @param name The name of the FeatureType. |
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140 * @param srs The SRS (e.g. "EPSG:31466"). |
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141 * @param geometryType The geometry type's class (e.g. Polygon.class). |
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142 * @param attrs Optional. An object with attribute-name/attribute-class pairs |
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143 * where index 0 specifies the name as string and index 1 the |
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144 * ype as class. |
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145 * |
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146 * @return a new SimpleFeatureType. |
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147 */ |
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148 public static SimpleFeatureType buildFeatureType(String name, String srs, |
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149 Class<?> geometryType, Object[][] attrs) { |
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150 try { |
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151 SimpleFeatureTypeBuilder builder = new SimpleFeatureTypeBuilder(); |
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152 CoordinateReferenceSystem crs = CRS.decode(srs); |
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153 |
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154 builder.setName("flys"); |
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155 builder.setNamespaceURI("http://www.intevation.de/"); |
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156 builder.setCRS(crs); |
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157 builder.setSRS(srs); |
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158 |
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159 builder.add("geometry", geometryType, crs); |
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160 |
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161 if (attrs != null) { |
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162 for (Object[] attr: attrs) { |
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163 builder.add((String) attr[0], (Class<?>) attr[1]); |
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164 } |
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165 } |
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166 |
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167 return builder.buildFeatureType(); |
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168 } |
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169 catch (NoSuchAuthorityCodeException nsae) { |
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170 } |
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171 catch (FactoryException fe) { |
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172 } |
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173 |
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174 return null; |
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175 } |
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176 |
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177 public static List<SimpleFeature> parseGeoJSON( |
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178 String geojson, SimpleFeatureType ft |
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179 ) { |
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180 List<SimpleFeature> collection = new ArrayList<SimpleFeature>(); |
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181 |
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182 try { |
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183 FeatureJSON fjson = new FeatureJSON(); |
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184 fjson.setFeatureType(ft); |
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185 |
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186 FeatureIterator<SimpleFeature> iterator = |
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187 fjson.streamFeatureCollection(geojson); |
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188 |
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189 while (iterator.hasNext()) { |
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190 collection.add(iterator.next()); |
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191 } |
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192 } |
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193 catch (IOException ioe) { |
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194 // TODO handle exception |
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195 } |
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196 |
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197 return collection; |
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198 } |
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199 |
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200 |
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201 /** |
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202 * This method returns the {@link CoordinateReferenceSystem} by the |
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203 * {@link String} <i>epsg</i>. |
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204 * |
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205 * @param epsg An EPSG code like <b>EPSG:31466</b> |
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206 * |
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207 * @return the {@link CoordinateReferenceSystem} specified by <i>epsg</i>. |
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208 */ |
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209 public static CoordinateReferenceSystem getCoordinateReferenceSystem( |
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210 String epsg |
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211 ) { |
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212 if (epsg == null) { |
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213 logger.warn("cannot create CoordinateReferenceSystem with null"); |
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214 return null; |
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215 } |
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216 |
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217 if (!epsg.startsWith(PREFIX_EPSG)) { |
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218 epsg = PREFIX_EPSG + epsg; |
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219 } |
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220 |
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221 try { |
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222 return CRS.decode(epsg); |
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223 } |
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224 catch (FactoryException fe) { |
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225 logger.error( |
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226 "unable to get CoordinateReferenceSystem for: " + epsg, |
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227 fe); |
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228 } |
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229 |
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230 return null; |
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231 } |
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232 |
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233 |
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234 public static Envelope transform(Envelope orig, String targetSrs) { |
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235 return transform(orig, targetSrs, DEFAULT_EPSG); |
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236 } |
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237 |
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238 |
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239 public static Envelope transform( |
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240 Envelope orig, |
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241 String targetSrs, |
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242 String origSrs |
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243 ) { |
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244 if (targetSrs == null || orig == null || origSrs == null) { |
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245 logger.warn("unable to transform envelope: empty parameters"); |
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246 return orig; |
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247 } |
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248 |
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249 logger.debug("Transform envlope to '" + targetSrs + "'"); |
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250 try { |
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251 CoordinateReferenceSystem sourceCRS = |
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252 getCoordinateReferenceSystem(origSrs); |
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253 |
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254 CoordinateReferenceSystem targetCRS = |
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255 getCoordinateReferenceSystem(targetSrs); |
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256 |
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257 if (sourceCRS != null && targetCRS != null) { |
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258 ReferencedEnvelope tmpEnv = |
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259 new ReferencedEnvelope(orig, CRS.decode(origSrs)); |
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260 |
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261 Envelope target = tmpEnv.transform(targetCRS, false); |
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262 |
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263 if (logger.isDebugEnabled()) { |
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264 logger.debug(" orig envelope : " + orig); |
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265 logger.debug(" transformed envelope: " + target); |
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266 } |
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267 |
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268 return target; |
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269 } |
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270 } |
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271 catch (NoSuchAuthorityCodeException nsae) { |
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272 logger.error("Cannot get CoordinateReferenceSystem!", nsae); |
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273 } |
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274 catch (FactoryException fe) { |
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275 logger.error("Cannot get CoordinateReferenceSystem!", fe); |
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276 } |
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277 catch (TransformException te) { |
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278 logger.error("Cannot transform envelope from source " |
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279 + origSrs + " to target srs " + targetSrs); |
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280 } |
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281 |
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282 return null; |
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283 } |
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284 |
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285 |
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286 public static boolean writeShapefile(File shape, |
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287 SimpleFeatureType featureType, FeatureCollection<?, ?> collection) { |
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288 return writeShapefile(shape, featureType, collection, |
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289 featureType.getCoordinateReferenceSystem()); |
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290 } |
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291 |
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292 |
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293 public static boolean writeShapefile(File shape, |
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294 SimpleFeatureType featureType, FeatureCollection<?, ?> collection, |
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295 CoordinateReferenceSystem crs) { |
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296 if (collection.isEmpty()) { |
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297 logger.warn("Shapefile is not written - no features given!"); |
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298 return false; |
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299 } |
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300 |
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301 Transaction transaction = null; |
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302 |
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303 try { |
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304 MathTransform transform = CRS.findMathTransform( |
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305 CRS.decode(DEFAULT_EPSG), crs); |
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306 |
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307 Map<String, Serializable> params = |
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308 new HashMap<String, Serializable>(); |
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309 |
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310 params.put("url", shape.toURI().toURL()); |
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311 params.put("create spatial index", Boolean.TRUE); |
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312 |
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313 DataStoreFactorySpi dataStoreFactory = |
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314 new ShapefileDataStoreFactory(); |
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315 |
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316 ShapefileDataStore newDataStore = |
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317 (ShapefileDataStore)dataStoreFactory.createNewDataStore(params); |
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318 newDataStore.createSchema(featureType); |
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319 |
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320 transaction = new DefaultTransaction("create"); |
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321 |
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322 String typeName = newDataStore.getTypeNames()[0]; |
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323 |
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324 FeatureWriter<SimpleFeatureType, SimpleFeature> writer = |
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325 newDataStore.getFeatureWriter(typeName, transaction); |
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326 |
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327 SimpleFeatureIterator iterator = (SimpleFeatureIterator) collection.features(); |
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328 |
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329 while (iterator.hasNext()){ |
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330 SimpleFeature feature = iterator.next(); |
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331 SimpleFeature copy = writer.next(); |
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332 |
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333 copy.setAttributes(feature.getAttributes()); |
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334 |
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335 Geometry orig = (Geometry) feature.getDefaultGeometry(); |
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336 Geometry reprojected = JTS.transform(orig, transform); |
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337 |
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338 copy.setDefaultGeometry(reprojected); |
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339 writer.write(); |
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340 } |
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341 |
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342 transaction.commit(); |
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343 |
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344 return true; |
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345 } |
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346 catch (MalformedURLException mue) { |
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347 logger.error("Unable to prepare shapefile: " + mue.getMessage()); |
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348 } |
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349 catch (IOException ioe) { |
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350 logger.error("Unable to write shapefile: " + ioe.getMessage()); |
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351 } |
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352 catch (NoSuchAuthorityCodeException nsae) { |
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353 logger.error("Cannot get CoordinateReferenceSystem for '" |
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354 + DEFAULT_EPSG + "'"); |
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355 } |
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356 catch (FactoryException fe) { |
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357 logger.error("Cannot get CoordinateReferenceSystem for '" |
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358 + DEFAULT_EPSG + "'"); |
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359 } |
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360 catch (TransformException te) { |
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361 logger.error("Was not able to transform geometry!", te); |
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362 } |
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363 finally { |
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364 if (transaction != null) { |
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365 try { |
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366 transaction.close(); |
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367 } |
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368 catch (IOException ioe) { /* do nothing */ } |
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369 } |
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370 } |
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371 |
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372 return false; |
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373 } |
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374 } |
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375 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 : |