Mercurial > dive4elements > gnv-client
annotate gnv-artifacts/src/main/java/de/intevation/gnv/raster/JTSMultiPolygonProducer.java @ 498:4080b57dcb52
Upgraded to Geotools 2.5.8. Write polygons and line strings to
shape files.
gnv-artifacts/trunk@578 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author | Sascha L. Teichmann <sascha.teichmann@intevation.de> |
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date | Tue, 19 Jan 2010 21:23:28 +0000 |
parents | 6e8364e766fa |
children | e065a72f6b62 |
rev | line source |
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1 package de.intevation.gnv.raster; |
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2 |
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3 import java.util.Map; |
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4 import java.util.List; |
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5 import java.util.HashMap; |
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6 import java.util.TreeMap; |
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7 import java.util.ArrayList; |
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8 |
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9 import com.vividsolutions.jts.geom.GeometryFactory; |
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10 import com.vividsolutions.jts.geom.MultiPolygon; |
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11 import com.vividsolutions.jts.geom.Polygon; |
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12 import com.vividsolutions.jts.geom.Coordinate; |
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13 import com.vividsolutions.jts.geom.LinearRing; |
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14 import com.vividsolutions.jts.geom.PrecisionModel; |
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15 |
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16 import com.vividsolutions.jts.algorithm.CGAlgorithms; |
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17 |
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18 import com.vividsolutions.jts.geom.impl.PackedCoordinateSequenceFactory; |
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19 |
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20 import org.apache.log4j.Logger; |
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21 |
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22 import de.intevation.gnv.raster.Vectorizer.Edge; |
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23 |
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24 /** |
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25 * @author Sascha L. Teichmann (sascha.teichmann@intevation.de) |
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26 */ |
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27 public class JTSMultiPolygonProducer |
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28 extends AbstractProducer |
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29 { |
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30 private static Logger log = Logger.getLogger( |
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31 JTSMultiPolygonProducer.class); |
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32 |
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33 public static final int SRID_WGS84 = 4326; |
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34 |
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35 public interface ValueConverter { |
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36 |
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37 Integer convert(Integer value); |
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38 |
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39 } // interface ValueConverter |
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40 |
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41 protected GeometryFactory geometryFactory; |
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42 |
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43 protected HashMap<Integer, ArrayList<Polygon>> valueToPolygons; |
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44 |
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45 public JTSMultiPolygonProducer() { |
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46 } |
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47 |
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48 public JTSMultiPolygonProducer( |
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49 double minX, double minY, |
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50 double maxX, double maxY |
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51 ) { |
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52 this( |
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53 createDefaultGeometryFactory(), |
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54 minX, minY, |
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55 maxX, maxY); |
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56 } |
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57 |
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58 public JTSMultiPolygonProducer( |
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59 GeometryFactory geometryFactory, |
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60 double minX, double minY, |
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61 double maxX, double maxY |
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62 ) { |
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63 super(minX, minY, maxX, maxY); |
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64 this.geometryFactory = geometryFactory; |
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65 valueToPolygons = new HashMap<Integer, ArrayList<Polygon>>(); |
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66 } |
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67 |
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68 public static GeometryFactory createDefaultGeometryFactory() { |
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69 return createDefaultGeometryFactory(2); |
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70 } |
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71 |
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72 public static GeometryFactory createDefaultGeometryFactory(int dim) { |
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73 return new GeometryFactory( |
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74 new PrecisionModel( |
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75 PrecisionModel.FLOATING), |
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76 SRID_WGS84, |
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77 new PackedCoordinateSequenceFactory( |
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78 PackedCoordinateSequenceFactory.DOUBLE, |
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79 dim)); |
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80 } |
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81 |
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82 public void handleRings( |
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83 List<Edge> rings, |
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84 int value, |
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85 int width, |
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86 int height |
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87 ) { |
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88 if (value == -1) { |
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89 return; |
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90 } |
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91 |
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92 Integer v = Integer.valueOf(value); |
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93 |
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94 ArrayList<Polygon> polygons = valueToPolygons.get(v); |
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95 |
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96 if (polygons == null) { |
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97 valueToPolygons.put(v, polygons = new ArrayList<Polygon>()); |
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98 } |
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99 |
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100 double b1 = minX; |
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101 double m1 = width != 1 |
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102 ? (maxX - minX)/(width-1) |
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103 : 0d; |
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104 |
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105 double b2 = minY; |
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106 double m2 = height != 1 |
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107 ? (maxY - minY)/(height-1) |
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108 : 0d; |
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109 |
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110 ArrayList<Coordinate> vertices = new ArrayList<Coordinate>(); |
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111 |
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112 LinearRing shell = null; |
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113 ArrayList<LinearRing> holes = new ArrayList<LinearRing>(); |
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114 |
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115 for (Edge head: rings) { |
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116 Edge current = head; |
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117 do { |
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118 vertices.add(new Coordinate( |
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119 m1*(current.a % width) + b1, |
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120 m2*(current.a / width) + b2)); |
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121 } |
495
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122 while ((current = current.prev) != head); |
465
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123 vertices.add(new Coordinate( |
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124 m1*(head.a % width) + b1, |
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125 m2*(head.a / width) + b2)); |
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126 |
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127 Coordinate [] coordinates = |
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128 vertices.toArray(new Coordinate[vertices.size()]); |
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129 |
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130 vertices.clear(); |
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131 |
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132 LinearRing ring = geometryFactory.createLinearRing( |
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133 coordinates); |
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134 |
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135 if (CGAlgorithms.isCCW(coordinates)) { |
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136 shell = ring; |
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137 } |
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138 else { |
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139 holes.add(ring); |
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140 } |
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141 } |
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142 |
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143 if (shell == null) { |
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144 log.error("polygon has no shell"); |
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145 return; |
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146 } |
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147 |
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148 Polygon polygon = geometryFactory.createPolygon( |
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149 shell, |
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150 holes.toArray(new LinearRing[holes.size()])); |
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151 |
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152 polygons.add(polygon); |
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153 } |
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154 |
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155 public Map<Integer, MultiPolygon> getMultiPolygons() { |
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156 return getMultiPolygons(null); |
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157 } |
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158 |
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159 public Map<Integer, MultiPolygon> getMultiPolygons( |
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160 ValueConverter valueConverter |
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161 ) { |
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162 TreeMap<Integer, MultiPolygon> multiPolygons = |
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163 new TreeMap<Integer, MultiPolygon>(); |
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164 |
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165 for (Map.Entry<Integer, ArrayList<Polygon>> entry: |
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166 valueToPolygons.entrySet() |
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167 ) { |
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168 ArrayList<Polygon> polygons = entry.getValue(); |
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169 |
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170 Integer value = valueConverter != null |
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171 ? valueConverter.convert(entry.getKey()) |
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172 : entry.getKey(); |
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173 |
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174 multiPolygons.put( |
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175 value, |
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176 geometryFactory.createMultiPolygon( |
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177 polygons.toArray(new Polygon[polygons.size()]))); |
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178 } |
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179 |
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180 return multiPolygons; |
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181 } |
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182 |
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183 public void clear() { |
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184 valueToPolygons.clear(); |
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185 } |
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186 } |
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187 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 : |