1 | // License: GPL. For details, see LICENSE file.
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2 | package org.openstreetmap.josm.gui.dialogs.relation.sort;
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3 |
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4 | import static org.openstreetmap.josm.gui.dialogs.relation.sort.WayConnectionType.Direction.NONE;
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5 |
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6 | import java.util.ArrayList;
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7 | import java.util.List;
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8 | import java.util.Map;
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9 | import java.util.Set;
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10 | import java.util.TreeMap;
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11 | import java.util.TreeSet;
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12 |
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13 | import org.openstreetmap.josm.data.osm.Node;
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14 | import org.openstreetmap.josm.data.osm.RelationMember;
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15 | import org.openstreetmap.josm.data.osm.Way;
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16 |
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17 | /**
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18 | * Auxiliary class for relation sorting.
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19 | *
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20 | * Constructs two mappings: One that maps each way to its nodes and the inverse mapping that
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21 | * maps each node to all ways that have this node.
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22 | * After construction both maps are consistent, but later on objects that are no longer needed
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23 | * are removed from the value sets.
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24 | * However the corresponding keys are not deleted even if they map to an empty set.
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25 | * Note that normal ways have 2 nodes (beginning and end) but roundabouts can have less or more
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26 | * (that are shared by other members).
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27 | *
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28 | * @author Christiaan Welvaart <cjw@time4t.net>
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29 | * @since 1785
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30 | */
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31 | public class RelationNodeMap {
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32 |
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33 | private static final String ROLE_BACKWARD = "backward";
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34 |
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35 | private static class NodesWays {
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36 | public final Map<Node, Set<Integer>> nodes = new TreeMap<>();
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37 | public final Map<Integer, Set<Node>> ways = new TreeMap<>();
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38 | public final boolean oneWay;
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39 |
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40 | NodesWays(boolean oneWay) {
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41 | this.oneWay = oneWay;
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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 | * the maps. (Need TreeMap for efficiency.)
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47 | */
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48 | private final NodesWays map = new NodesWays(false);
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49 | /*
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50 | * Maps for oneways (forward/backward roles)
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51 | */
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52 |
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53 | private final NodesWays onewayMap = new NodesWays(true);
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54 | private final NodesWays onewayReverseMap = new NodesWays(true);
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55 | /*
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56 | * Used to keep track of what members are done.
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57 | */
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58 | private final Set<Integer> remaining = new TreeSet<>();
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59 | private final Map<Integer, Set<Node>> remainingOneway = new TreeMap<>();
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60 |
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61 | /**
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62 | * All members that are incomplete or not a way
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63 | */
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64 | private final List<Integer> notSortable = new ArrayList<>();
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65 |
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66 | /**
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67 | * Gets the start node of the member, respecting the direction role.
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68 | * @param m The relation member.
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69 | * @return <code>null</code> if the member is no way, the node otherwise.
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70 | */
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71 | public static Node firstOnewayNode(RelationMember m) {
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72 | if (!m.isWay()) return null;
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73 | if (ROLE_BACKWARD.equals(m.getRole())) {
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74 | return m.getWay().lastNode();
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75 | }
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76 | return m.getWay().firstNode();
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77 | }
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78 |
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79 | /**
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80 | * Gets the end node of the member, respecting the direction role.
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81 | * @param m The relation member.
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82 | * @return <code>null</code> if the member is no way, the node otherwise.
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83 | */
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84 | public static Node lastOnewayNode(RelationMember m) {
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85 | if (!m.isWay()) return null;
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86 | if (ROLE_BACKWARD.equals(m.getRole())) {
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87 | return m.getWay().firstNode();
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88 | }
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89 | return m.getWay().lastNode();
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90 | }
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91 |
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92 | RelationNodeMap(List<RelationMember> members) {
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93 | for (int i = 0; i < members.size(); ++i) {
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94 | RelationMember m = members.get(i);
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95 | if (m.getMember().isIncomplete() || !m.isWay() || m.getWay().getNodesCount() < 2) {
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96 | notSortable.add(i);
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97 | continue;
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98 | }
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99 |
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100 | Way w = m.getWay();
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101 | if (RelationSortUtils.roundaboutType(w) != NONE) {
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102 | for (Node nd : w.getNodes()) {
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103 | addPair(nd, i);
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104 | }
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105 | } else if (RelationSortUtils.isOneway(m)) {
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106 | addNodeWayMap(firstOnewayNode(m), i);
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107 | addWayNodeMap(lastOnewayNode(m), i);
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108 | addNodeWayMapReverse(lastOnewayNode(m), i);
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109 | addWayNodeMapReverse(firstOnewayNode(m), i);
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110 | addRemainingForward(firstOnewayNode(m), i);
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111 | addRemainingForward(lastOnewayNode(m), i);
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112 | } else {
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113 | addPair(w.firstNode(), i);
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114 | addPair(w.lastNode(), i);
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115 | }
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116 | }
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117 |
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118 | remaining.addAll(map.ways.keySet());
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119 | }
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120 |
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121 | private void addPair(Node n, int i) {
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122 | map.nodes.computeIfAbsent(n, k -> new TreeSet<>()).add(i);
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123 | map.ways.computeIfAbsent(i, k -> new TreeSet<>()).add(n);
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124 | }
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125 |
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126 | private void addNodeWayMap(Node n, int i) {
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127 | onewayMap.nodes.computeIfAbsent(n, k -> new TreeSet<>()).add(i);
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128 | }
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129 |
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130 | private void addWayNodeMap(Node n, int i) {
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131 | onewayMap.ways.computeIfAbsent(i, k -> new TreeSet<>()).add(n);
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132 | }
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133 |
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134 | private void addNodeWayMapReverse(Node n, int i) {
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135 | onewayReverseMap.nodes.computeIfAbsent(n, k -> new TreeSet<>()).add(i);
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136 | }
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137 |
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138 | private void addWayNodeMapReverse(Node n, int i) {
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139 | onewayReverseMap.ways.computeIfAbsent(i, k -> new TreeSet<>()).add(n);
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140 | }
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141 |
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142 | private void addRemainingForward(Node n, int i) {
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143 | remainingOneway.computeIfAbsent(i, k -> new TreeSet<>()).add(n);
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144 | }
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145 |
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146 | private Integer firstOneway;
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147 | private Node lastOnewayNode;
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148 | private Node firstCircular;
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149 |
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150 | /**
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151 | * Return a relation member that is linked to the member 'i', but has not been popped yet.
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152 | * Return null if there is no such member left.
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153 | * @param way way key
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154 | * @return a relation member that is linked to the member 'i', but has not been popped yet
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155 | */
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156 | public Integer popAdjacent(Integer way) {
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157 | if (lastOnewayNode != null) return popBackwardOnewayPart(way);
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158 | if (firstOneway != null) return popForwardOnewayPart(way);
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159 |
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160 | if (map.ways.containsKey(way)) {
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161 | for (Node n : map.ways.get(way)) {
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162 | Integer i = deleteAndGetAdjacentNode(map, n);
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163 | if (i != null) return i;
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164 |
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165 | Integer j = deleteAndGetAdjacentNode(onewayMap, n);
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166 | if (j != null) {
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167 | firstOneway = j;
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168 | return j;
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169 | }
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170 | }
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171 | }
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172 |
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173 | firstOneway = way;
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174 | return popForwardOnewayPart(way);
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175 | }
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176 |
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177 | private Integer popForwardOnewayPart(Integer way) {
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178 | if (onewayMap.ways.containsKey(way)) {
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179 | for (Node n : onewayMap.ways.get(way)) {
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180 | Integer i = findAdjacentWay(onewayMap, n);
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181 | if (i == null) {
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182 | continue;
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183 | }
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184 |
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185 | lastOnewayNode = processBackwardIfEndOfLoopReached(i);
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186 | if (lastOnewayNode != null)
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187 | return popBackwardOnewayPart(firstOneway);
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188 |
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189 | deleteWayNode(onewayMap, i, n);
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190 | return i;
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191 | }
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192 | }
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193 |
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194 | firstOneway = null;
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195 | return null;
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196 | }
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197 |
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198 | private Node processBackwardIfEndOfLoopReached(Integer way) { //find if we didn't reach end of the loop (and process backward part)
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199 | if (onewayReverseMap.ways.containsKey(way)) {
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200 | for (Node n : onewayReverseMap.ways.get(way)) {
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201 | if ((map.nodes.containsKey(n))
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202 | || (onewayMap.nodes.containsKey(n) && onewayMap.nodes.get(n).size() > 1))
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203 | return n;
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204 | if (firstCircular != null && firstCircular == n)
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205 | return firstCircular;
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206 | }
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207 | }
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208 | return null;
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209 | }
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210 |
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211 | private Integer popBackwardOnewayPart(int way) {
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212 | if (lastOnewayNode != null) {
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213 | Set<Node> nodes = new TreeSet<>();
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214 | if (onewayReverseMap.ways.containsKey(way)) {
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215 | nodes.addAll(onewayReverseMap.ways.get(way));
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216 | }
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217 | if (map.ways.containsKey(way)) {
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218 | nodes.addAll(map.ways.get(way));
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219 | }
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220 | for (Node n : nodes) {
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221 | if (n == lastOnewayNode) { //if oneway part ends
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222 | firstOneway = null;
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223 | lastOnewayNode = null;
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224 | Integer j = deleteAndGetAdjacentNode(map, n);
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225 | if (j != null) return j;
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226 |
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227 | Integer k = deleteAndGetAdjacentNode(onewayMap, n);
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228 | if (k != null) {
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229 | firstOneway = k;
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230 | return k;
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231 | }
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232 | }
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233 |
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234 | Integer j = deleteAndGetAdjacentNode(onewayReverseMap, n);
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235 | if (j != null) return j;
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236 | }
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237 | }
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238 |
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239 | firstOneway = null;
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240 | lastOnewayNode = null;
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241 |
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242 | return null;
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243 | }
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244 |
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245 | /**
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246 | * find next node in nw NodeWays structure, if the node is found delete and return it
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247 | * @param nw nodes and ways
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248 | * @param n node
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249 | * @return node next to n
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250 | */
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251 | private Integer deleteAndGetAdjacentNode(NodesWays nw, Node n) {
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252 | Integer j = findAdjacentWay(nw, n);
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253 | if (j == null) return null;
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254 | deleteWayNode(nw, j, n);
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255 | return j;
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256 | }
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257 |
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258 | private static Integer findAdjacentWay(NodesWays nw, Node n) {
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259 | Set<Integer> adj = nw.nodes.get(n);
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260 | if (adj == null || adj.isEmpty()) return null;
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261 | return adj.iterator().next();
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262 | }
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263 |
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264 | private void deleteWayNode(NodesWays nw, Integer way, Node n) {
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265 | if (nw.oneWay) {
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266 | doneOneway(way);
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267 | } else {
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268 | done(way);
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269 | }
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270 | nw.ways.get(way).remove(n);
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271 | }
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272 |
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273 | /**
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274 | * Returns some remaining member or null if every sortable member has been processed.
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275 | * @return member key
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276 | */
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277 | public Integer pop() {
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278 | if (!remaining.isEmpty()) {
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279 | Integer i = remaining.iterator().next();
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280 | done(i);
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281 | return i;
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282 | }
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283 |
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284 | if (remainingOneway.isEmpty()) return null;
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285 | for (Integer i : remainingOneway.keySet()) { //find oneway, which is connected to more than one way (is between two oneway loops)
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286 | for (Node n : onewayReverseMap.ways.get(i)) {
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287 | if (onewayReverseMap.nodes.containsKey(n) && onewayReverseMap.nodes.get(n).size() > 1) {
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288 | doneOneway(i);
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289 | firstCircular = n;
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290 | return i;
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291 | }
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292 | }
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293 | }
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294 |
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295 | Integer i = remainingOneway.keySet().iterator().next();
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296 | doneOneway(i);
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297 | return i;
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298 | }
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299 |
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300 | /**
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301 | * This relation member has been processed.
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302 | * Remove references in the map.nodes.
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303 | * @param i member key
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304 | */
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305 | private void doneOneway(Integer i) {
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306 | Set<Node> nodesForward = remainingOneway.get(i);
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307 | for (Node n : nodesForward) {
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308 | if (onewayMap.nodes.containsKey(n)) {
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309 | onewayMap.nodes.get(n).remove(i);
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310 | }
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311 | if (onewayReverseMap.nodes.containsKey(n)) {
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312 | onewayReverseMap.nodes.get(n).remove(i);
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313 | }
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314 | }
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315 | remainingOneway.remove(i);
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316 | }
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317 |
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318 | private void done(Integer i) {
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319 | remaining.remove(i);
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320 | Set<Node> nodes = map.ways.get(i);
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321 | for (Node n : nodes) {
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322 | boolean result = map.nodes.get(n).remove(i);
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323 | if (!result) throw new AssertionError();
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324 | }
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325 | }
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326 |
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327 | public List<Integer> getNotSortableMembers() {
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328 | return notSortable;
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329 | }
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330 | }
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