1 | // License: GPL. For details, see LICENSE file.
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2 | package org.openstreetmap.josm.actions;
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3 |
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4 | import java.util.Collection;
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5 | import java.util.LinkedList;
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6 | import java.util.Set;
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7 | import java.util.TreeSet;
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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.OsmPrimitive;
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12 | import org.openstreetmap.josm.data.osm.Way;
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13 |
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14 | /**
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15 | * Auxiliary class for the {@link SelectNonBranchingWaySequencesAction}.
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16 | *
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17 | * @author Marko Mäkelä
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18 | */
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19 | public class SelectNonBranchingWaySequences {
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20 | /**
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21 | * outer endpoints of selected ways
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22 | */
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23 | Set<Node> outerNodes;
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24 | /**
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25 | * endpoints of selected ways
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26 | */
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27 | Set<Node> nodes;
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28 |
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29 | /**
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30 | * Creates a way selection
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31 | *
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32 | * @param ways selection a selection of ways
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33 | */
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34 | public SelectNonBranchingWaySequences(final Collection<Way> ways) {
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35 | if (ways.isEmpty()) {
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36 | // The selection cannot be extended.
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37 | outerNodes = null;
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38 | nodes = null;
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39 | } else {
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40 | nodes = new TreeSet<>();
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41 | outerNodes = new TreeSet<>();
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42 |
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43 | for (Way way : ways)
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44 | addNodes(way);
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45 | }
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46 | }
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47 |
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48 | /**
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49 | * Add a way endpoint to nodes, outerNodes
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50 | *
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51 | * @param node a way endpoint
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52 | */
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53 | private void addNodes(Node node) {
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54 | if (node == null) return;
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55 | else if (!nodes.add(node))
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56 | outerNodes.remove(node);
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57 | else
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58 | outerNodes.add(node);
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59 | }
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60 |
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61 | /**
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62 | * Add the endpoints of the way to nodes, outerNodes
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63 | *
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64 | * @param way a way whose endpoints are added
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65 | */
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66 | private void addNodes(Way way) {
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67 | addNodes(way.firstNode());
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68 | addNodes(way.lastNode());
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69 | }
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70 |
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71 | /**
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72 | * Find out if the selection can be extended
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73 | *
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74 | * @return true if the selection can be extended
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75 | */
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76 | public boolean canExtend() {
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77 | return outerNodes != null && !outerNodes.isEmpty();
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78 | }
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79 |
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80 | /**
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81 | * Finds out if the current selection can be extended.
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82 | *
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83 | * @param selection current selection (ways and others)
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84 | * @param node perimeter node from which to extend the selection
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85 | * @return a way by which to extend the selection, or null
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86 | */
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87 | private static Way findWay(Collection<OsmPrimitive> selection, Node node) {
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88 | Way foundWay = null;
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89 |
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90 | for (Way way : OsmPrimitive.getFilteredList(node.getReferrers(),
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91 | Way.class)) {
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92 | if (way.getNodesCount() < 2 || !way.isFirstLastNode(node)
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93 | || selection.contains(way))
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94 | continue;
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95 |
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96 | /* A previously unselected way was found that is connected
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97 | to the node. */
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98 | if (foundWay != null)
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99 | /* This is not the only qualifying way. There is a
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100 | branch at the node, and we cannot extend the selection. */
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101 | return null;
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102 |
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103 | /* Remember the first found qualifying way. */
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104 | foundWay = way;
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105 | }
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106 |
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107 | /* Return the only way found, or null if none was found. */
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108 | return foundWay;
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109 | }
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110 |
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111 | /**
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112 | * Finds out if the current selection can be extended.
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113 | * <p>
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114 | * The members outerNodes, nodes must have been initialized.
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115 | * How to update these members when extending the selection, @see extend().
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116 | * </p>
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117 | * @param selection current selection
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118 | * @return a way by which to extend the selection, or null
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119 | */
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120 | private Way findWay(Collection<OsmPrimitive> selection) {
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121 | for (Node node : outerNodes) {
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122 | Way way = findWay(selection, node);
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123 | if (way != null)
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124 | return way;
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125 | }
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126 |
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127 | return null;
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128 | }
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129 |
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130 | /**
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131 | * Extend the current selection
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132 | *
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133 | * @param data the data set in which to extend the selection
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134 | */
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135 | public void extend(DataSet data) {
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136 | Collection<OsmPrimitive> currentSelection;
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137 | LinkedList<OsmPrimitive> selection;
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138 | boolean selectionChanged = false;
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139 | Way way;
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140 |
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141 | if (!canExtend())
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142 | return;
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143 |
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144 | currentSelection = data.getSelected();
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145 |
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146 | way = findWay(currentSelection);
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147 |
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148 | if (way == null)
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149 | return;
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150 |
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151 | selection = new LinkedList<>();
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152 | for (OsmPrimitive primitive : currentSelection)
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153 | selection.add(primitive);
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154 |
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155 | do {
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156 | if (!selection.add(way))
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157 | break;
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158 |
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159 | selectionChanged = true;
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160 | addNodes(way);
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161 |
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162 | way = findWay(selection);
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163 | } while (way != null);
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164 |
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165 | if (selectionChanged)
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166 | data.setSelected(selection, true);
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167 | }
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168 | }
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