1 | // License: GPL. For details, see LICENSE file.
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2 | package org.openstreetmap.josm.data.osm.visitor;
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3 |
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4 | import java.util.ArrayList;
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5 | import java.util.HashMap;
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6 | import java.util.List;
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7 | import java.util.Map;
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8 |
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9 | import org.openstreetmap.josm.data.osm.DataSet;
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10 | import org.openstreetmap.josm.data.osm.Node;
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11 | import org.openstreetmap.josm.data.osm.NodeData;
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12 | import org.openstreetmap.josm.data.osm.OsmPrimitive;
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13 | import org.openstreetmap.josm.data.osm.PrimitiveData;
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14 | import org.openstreetmap.josm.data.osm.Relation;
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15 | import org.openstreetmap.josm.data.osm.RelationData;
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16 | import org.openstreetmap.josm.data.osm.RelationMember;
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17 | import org.openstreetmap.josm.data.osm.RelationMemberData;
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18 | import org.openstreetmap.josm.data.osm.Way;
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19 | import org.openstreetmap.josm.data.osm.WayData;
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20 | import org.openstreetmap.josm.tools.CheckParameterUtil;
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21 |
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22 | /**
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23 | * MergeSourceBuildingVisitor helps to build the "hull" of a collection of {@link OsmPrimitive}s
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24 | * which shall be merged into another layer. The "hull" is slightly bigger than the original
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25 | * collection. It includes, for instance the nodes of a way in the original collection even though
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26 | * these nodes might not be present explicitly in the original collection. The "hull" also includes
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27 | * incomplete {@link OsmPrimitive}s which are referred to by relations in the original collection. And
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28 | * it turns {@link OsmPrimitive} referred to by {@link Relation}s in the original collection into
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29 | * incomplete {@link OsmPrimitive}s in the "hull", if they are not themselves present in the
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30 | * original collection.
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31 | *
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32 | */
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33 | public class MergeSourceBuildingVisitor extends AbstractVisitor {
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34 | private DataSet selectionBase;
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35 | private DataSet hull;
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36 | private Map<OsmPrimitive, PrimitiveData> mappedPrimitives;
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37 |
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38 | /**
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39 | * Creates the visitor. The visitor starts to build the "hull" from
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40 | * the currently selected primitives in the dataset <code>selectionBase</code>,
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41 | * i.e. from {@link DataSet#getSelected()}.
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42 | *
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43 | * @param selectionBase the dataset. Must not be null.
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44 | * @exception IllegalArgumentException thrown if selectionBase is null
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45 | *
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46 | */
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47 | public MergeSourceBuildingVisitor(DataSet selectionBase) throws IllegalArgumentException {
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48 | CheckParameterUtil.ensureParameterNotNull(selectionBase, "selectionBase");
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49 | this.selectionBase = selectionBase;
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50 | this.hull = new DataSet();
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51 | this.mappedPrimitives = new HashMap<>();
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52 | }
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53 |
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54 | protected boolean isInSelectionBase(OsmPrimitive primitive) {
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55 | return selectionBase.getAllSelected().contains(primitive);
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56 | }
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57 |
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58 | protected boolean isAlreadyRemembered(OsmPrimitive primitive) {
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59 | return mappedPrimitives.keySet().contains(primitive);
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60 | }
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61 |
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62 | /**
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63 | * Remebers a node in the "hull"
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64 | *
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65 | * @param n the node
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66 | */
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67 | protected void rememberNode(Node n) {
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68 | if (isAlreadyRemembered(n))
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69 | return;
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70 | mappedPrimitives.put(n, n.save());
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71 | }
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72 |
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73 | /**
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74 | * remembers a way in the hull
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75 | *
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76 | * @param w the way
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77 | */
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78 | protected void rememberWay(Way w) {
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79 | if (isAlreadyRemembered(w))
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80 | return;
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81 | WayData clone = w.save();
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82 | List<Long> newNodes = new ArrayList<>(w.getNodesCount());
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83 | for (Node n: w.getNodes()) {
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84 | newNodes.add(mappedPrimitives.get(n).getUniqueId());
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85 | }
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86 | clone.setNodes(newNodes);
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87 | mappedPrimitives.put(w, clone);
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88 | }
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89 |
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90 | /**
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91 | * Remembers a relation in the hull
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92 | *
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93 | * @param r the relation
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94 | */
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95 | protected void rememberRelation(Relation r) {
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96 | RelationData clone;
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97 | if (isAlreadyRemembered(r)) {
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98 | clone = (RelationData)mappedPrimitives.get(r);
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99 | } else {
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100 | clone = r.save();
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101 | mappedPrimitives.put(r, clone);
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102 | }
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103 |
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104 | List<RelationMemberData> newMembers = new ArrayList<>();
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105 | for (RelationMember member: r.getMembers()) {
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106 | newMembers.add(
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107 | new RelationMemberData(member.getRole(), mappedPrimitives.get(member.getMember())));
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108 |
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109 | }
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110 | clone.setMembers(newMembers);
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111 | }
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112 |
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113 | protected void rememberRelationPartial(Relation r) {
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114 | if (isAlreadyRemembered(r))
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115 | return;
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116 | RelationData clone = r.save();
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117 | clone.getMembers().clear();
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118 | mappedPrimitives.put(r, clone);
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119 | }
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120 |
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121 | protected void rememberIncomplete(OsmPrimitive primitive) {
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122 | if (isAlreadyRemembered(primitive))
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123 | return;
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124 | PrimitiveData clone = primitive.save();
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125 | clone.setIncomplete(true);
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126 | mappedPrimitives.put(primitive, clone);
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127 | }
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128 |
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129 | @Override
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130 | public void visit(Node n) {
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131 | rememberNode(n);
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132 | }
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133 |
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134 | @Override
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135 | public void visit(Way w) {
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136 | // remember all nodes this way refers to ...
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137 | //
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138 | for (Node n: w.getNodes()) {
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139 | n.accept(this);
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140 | }
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141 | // ... and the way itself
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142 | rememberWay(w);
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143 | }
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144 |
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145 | @Override
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146 | public void visit(Relation r) {
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147 | // first, remember all primitives members refer to (only if necessary, see
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148 | // below)
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149 | //
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150 | rememberRelationPartial(r);
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151 | for (RelationMember member: r.getMembers()) {
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152 | if (isAlreadyRemembered(member.getMember())) {
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153 | // referred primitive already remembered
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154 | //
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155 | continue;
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156 | }
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157 | if (isInSelectionBase(member.getMember()) || member.getMember().isNew()) {
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158 | member.getMember().accept(this);
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159 | } else {
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160 | rememberIncomplete(member.getMember());
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161 | }
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162 | }
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163 | rememberRelation(r);
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164 | }
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165 |
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166 | protected void buildHull() {
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167 | // Create all primitives first
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168 | for (PrimitiveData primitive: mappedPrimitives.values()) {
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169 | OsmPrimitive newPrimitive = hull.getPrimitiveById(primitive);
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170 | boolean created = newPrimitive == null;
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171 | if (created) {
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172 | newPrimitive = primitive.getType().newInstance(primitive.getUniqueId(), true);
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173 | }
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174 | if (newPrimitive instanceof Node && !primitive.isIncomplete()) {
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175 | newPrimitive.load(primitive);
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176 | }
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177 | if (created) {
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178 | hull.addPrimitive(newPrimitive);
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179 | }
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180 | }
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181 | // Then ways and relations
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182 | for (PrimitiveData primitive : mappedPrimitives.values()) {
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183 | if (!(primitive instanceof NodeData) && !primitive.isIncomplete()) {
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184 | hull.getPrimitiveById(primitive).load(primitive);
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185 | }
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186 | }
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187 | }
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188 |
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189 | public DataSet build() {
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190 | for (OsmPrimitive primitive: selectionBase.getAllSelected()) {
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191 | primitive.accept(this);
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192 | }
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193 | buildHull();
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194 | return hull;
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195 | }
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196 | }
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