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.HashMap;
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5 | import java.util.List;
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6 | import java.util.Map;
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7 | import java.util.stream.Collectors;
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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 | import org.openstreetmap.josm.tools.Utils;
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22 |
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23 | /**
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24 | * MergeSourceBuildingVisitor helps to build the "hull" of a collection of {@link OsmPrimitive}s
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25 | * which shall be merged into another layer. The "hull" is slightly bigger than the original
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26 | * collection. It includes, for instance the nodes of a way in the original collection even though
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27 | * these nodes might not be present explicitly in the original collection. The "hull" also includes
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28 | * incomplete {@link OsmPrimitive}s which are referred to by relations in the original collection. And
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29 | * it turns {@link OsmPrimitive} referred to by {@link Relation}s in the original collection into
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30 | * incomplete {@link OsmPrimitive}s in the "hull", if they are not themselves present in the original collection.
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31 | * @since 1891
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32 | */
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33 | public class MergeSourceBuildingVisitor implements OsmPrimitiveVisitor {
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34 | private final DataSet selectionBase;
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35 | private final DataSet hull;
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36 | private final 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 | * @throws IllegalArgumentException if selectionBase is null
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45 | */
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46 | public MergeSourceBuildingVisitor(DataSet selectionBase) {
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47 | CheckParameterUtil.ensureParameterNotNull(selectionBase, "selectionBase");
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48 | this.selectionBase = selectionBase;
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49 | this.hull = new DataSet();
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50 | this.mappedPrimitives = new HashMap<>();
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51 | }
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52 |
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53 | protected boolean isInSelectionBase(OsmPrimitive primitive) {
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54 | return selectionBase.getAllSelected().contains(primitive);
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55 | }
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56 |
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57 | protected boolean isAlreadyRemembered(OsmPrimitive primitive) {
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58 | return mappedPrimitives.containsKey(primitive);
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59 | }
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60 |
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61 | /**
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62 | * Remembers a node in the "hull"
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63 | *
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64 | * @param n the node
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65 | */
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66 | protected void rememberNode(Node n) {
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67 | if (isAlreadyRemembered(n))
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68 | return;
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69 | mappedPrimitives.put(n, n.save());
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70 | }
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71 |
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72 | /**
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73 | * remembers a way in the hull
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74 | *
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75 | * @param w the way
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76 | */
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77 | protected void rememberWay(Way w) {
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78 | if (isAlreadyRemembered(w))
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79 | return;
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80 | WayData clone = w.save();
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81 | List<Long> newNodes = Utils.transform(w.getNodes(), n -> mappedPrimitives.get(n).getUniqueId());
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82 | clone.setNodeIds(newNodes);
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83 | mappedPrimitives.put(w, clone);
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84 | }
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85 |
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86 | /**
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87 | * Remembers a relation in the hull
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88 | *
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89 | * @param r the relation
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90 | */
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91 | protected void rememberRelation(Relation r) {
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92 | RelationData clone;
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93 | if (isAlreadyRemembered(r)) {
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94 | clone = (RelationData) mappedPrimitives.get(r);
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95 | } else {
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96 | clone = r.save();
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97 | mappedPrimitives.put(r, clone);
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98 | }
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99 |
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100 | clone.setMembers(r.getMembers().stream()
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101 | .map(m -> new RelationMemberData(m.getRole(), mappedPrimitives.get(m.getMember())))
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102 | .collect(Collectors.toList()));
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103 | }
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104 |
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105 | protected void rememberRelationPartial(Relation r) {
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106 | if (isAlreadyRemembered(r))
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107 | return;
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108 | RelationData clone = r.save();
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109 | clone.getMembers().clear();
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110 | mappedPrimitives.put(r, clone);
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111 | }
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112 |
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113 | protected void rememberIncomplete(OsmPrimitive primitive) {
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114 | if (isAlreadyRemembered(primitive))
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115 | return;
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116 | PrimitiveData clone = primitive.save();
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117 | clone.setIncomplete(true);
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118 | mappedPrimitives.put(primitive, clone);
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119 | }
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120 |
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121 | @Override
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122 | public void visit(Node n) {
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123 | rememberNode(n);
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124 | }
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125 |
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126 | @Override
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127 | public void visit(Way w) {
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128 | // remember all nodes this way refers to ...
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129 | for (Node n: w.getNodes()) {
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130 | n.accept(this);
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131 | }
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132 | // ... and the way itself
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133 | rememberWay(w);
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134 | }
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135 |
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136 | @Override
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137 | public void visit(Relation r) {
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138 | // first, remember all primitives members refer to (only if necessary, see below)
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139 | rememberRelationPartial(r);
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140 | for (RelationMember member: r.getMembers()) {
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141 | if (isAlreadyRemembered(member.getMember())) {
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142 | // referred primitive already remembered
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143 | continue;
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144 | }
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145 | if (isInSelectionBase(member.getMember()) || member.getMember().isNew()) {
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146 | member.getMember().accept(this);
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147 | } else {
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148 | rememberIncomplete(member.getMember());
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149 | }
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150 | }
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151 | rememberRelation(r);
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152 | }
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153 |
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154 | protected void buildHull() {
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155 | // Create all primitives first
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156 | for (PrimitiveData primitive: mappedPrimitives.values()) {
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157 | OsmPrimitive newPrimitive = hull.getPrimitiveById(primitive);
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158 | boolean created = newPrimitive == null;
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159 | if (created) {
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160 | newPrimitive = primitive.getType().newInstance(primitive.getUniqueId(), true);
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161 | }
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162 | if (newPrimitive instanceof Node && !primitive.isIncomplete()) {
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163 | newPrimitive.load(primitive);
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164 | }
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165 | if (created) {
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166 | hull.addPrimitive(newPrimitive);
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167 | }
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168 | }
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169 | // Then ways and relations
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170 | for (PrimitiveData primitive : mappedPrimitives.values()) {
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171 | if (!(primitive instanceof NodeData) && !primitive.isIncomplete()) {
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172 | hull.getPrimitiveById(primitive).load(primitive);
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173 | }
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174 | }
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175 | }
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176 |
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177 | /**
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178 | * Builds and returns the "hull".
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179 | * @return the "hull" data set
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180 | */
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181 | public DataSet build() {
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182 | for (OsmPrimitive primitive: selectionBase.getAllSelected()) {
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183 | primitive.accept(this);
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184 | }
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185 | buildHull();
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186 | return hull;
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187 | }
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188 | }
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