1 | //License: GPL. Copyright 2007 by Immanuel Scholz and others
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2 | package org.openstreetmap.josm.actions;
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3 |
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4 | import static org.openstreetmap.josm.gui.conflict.tags.TagConflictResolutionUtil.combineTigerTags;
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5 | import static org.openstreetmap.josm.gui.conflict.tags.TagConflictResolutionUtil.completeTagCollectionForEditing;
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6 | import static org.openstreetmap.josm.gui.conflict.tags.TagConflictResolutionUtil.normalizeTagCollectionBeforeEditing;
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7 | import static org.openstreetmap.josm.gui.help.HelpUtil.ht;
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8 | import static org.openstreetmap.josm.tools.I18n.tr;
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9 |
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10 | import java.awt.event.ActionEvent;
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11 | import java.awt.event.KeyEvent;
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12 | import java.util.ArrayList;
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13 | import java.util.Collection;
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14 | import java.util.HashSet;
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15 | import java.util.LinkedHashSet;
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16 | import java.util.LinkedList;
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17 | import java.util.List;
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18 | import java.util.Set;
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19 |
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20 | import javax.swing.JOptionPane;
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21 |
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22 | import org.openstreetmap.josm.Main;
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23 | import org.openstreetmap.josm.command.ChangeCommand;
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24 | import org.openstreetmap.josm.command.Command;
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25 | import org.openstreetmap.josm.command.DeleteCommand;
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26 | import org.openstreetmap.josm.command.SequenceCommand;
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27 | import org.openstreetmap.josm.data.osm.Node;
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28 | import org.openstreetmap.josm.data.osm.OsmPrimitive;
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29 | import org.openstreetmap.josm.data.osm.RelationToChildReference;
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30 | import org.openstreetmap.josm.data.osm.TagCollection;
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31 | import org.openstreetmap.josm.data.osm.Way;
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32 | import org.openstreetmap.josm.gui.DefaultNameFormatter;
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33 | import org.openstreetmap.josm.gui.HelpAwareOptionPane;
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34 | import org.openstreetmap.josm.gui.HelpAwareOptionPane.ButtonSpec;
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35 | import org.openstreetmap.josm.gui.conflict.tags.CombinePrimitiveResolverDialog;
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36 | import org.openstreetmap.josm.gui.layer.OsmDataLayer;
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37 | import org.openstreetmap.josm.tools.CheckParameterUtil;
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38 | import org.openstreetmap.josm.tools.ImageProvider;
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39 | import org.openstreetmap.josm.tools.Shortcut;
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40 | /**
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41 | * Merges a collection of nodes into one node.
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42 | *
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43 | */
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44 | public class MergeNodesAction extends JosmAction {
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45 |
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46 | public MergeNodesAction() {
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47 | super(tr("Merge Nodes"), "mergenodes", tr("Merge nodes into the oldest one."),
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48 | Shortcut.registerShortcut("tools:mergenodes", tr("Tool: {0}", tr("Merge Nodes")), KeyEvent.VK_M, Shortcut.GROUP_EDIT), true);
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49 | putValue("help", ht("/Action/MergeNodesAction"));
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50 | }
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51 |
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52 | public void actionPerformed(ActionEvent event) {
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53 | if (!isEnabled())
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54 | return;
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55 | Collection<OsmPrimitive> selection = getCurrentDataSet().getSelected();
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56 | LinkedHashSet<Node> selectedNodes = OsmPrimitive.getFilteredSet(selection, Node.class);
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57 | if (selectedNodes.size() < 2) {
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58 | JOptionPane.showMessageDialog(
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59 | Main.parent,
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60 | tr("Please select at least two nodes to merge."),
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61 | tr("Warning"),
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62 | JOptionPane.WARNING_MESSAGE
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63 | );
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64 | return;
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65 | }
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66 |
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67 | Node targetNode = selectTargetNode(selectedNodes);
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68 | Command cmd = mergeNodes(Main.main.getEditLayer(), selectedNodes, targetNode);
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69 | if (cmd != null) {
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70 | Main.main.undoRedo.add(cmd);
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71 | Main.main.getEditLayer().data.setSelected(targetNode);
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72 | }
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73 | }
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74 |
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75 | /**
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76 | * Find which node to merge into (i.e. which one will be left)
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77 | * The last selected node will become the target node the remaining
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78 | * nodes are merged to.
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79 | *
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80 | * @param candidates the collection of candidate nodes
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81 | * @return the selected target node
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82 | */
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83 | public static Node selectTargetNode(LinkedHashSet<Node> candidates) {
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84 | Node targetNode = null;
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85 | for (Node n : candidates) { // pick last one
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86 | targetNode = n;
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87 | }
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88 | return targetNode;
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89 | }
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90 |
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91 | /**
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92 | * Fixes the parent ways referring to one of the nodes.
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93 | *
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94 | * Replies null, if the ways could not be fixed, i.e. because a way would have to be deleted
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95 | * which is referred to by a relation.
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96 | *
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97 | * @param nodesToDelete the collection of nodes to be deleted
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98 | * @param targetNode the target node the other nodes are merged to
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99 | * @return a list of commands; null, if the ways could not be fixed
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100 | */
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101 | protected static List<Command> fixParentWays(Collection<OsmPrimitive> nodesToDelete, Node targetNode) {
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102 | List<Command> cmds = new ArrayList<Command>();
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103 | Set<Way> waysToDelete = new HashSet<Way>();
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104 |
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105 | for (Way w: OsmPrimitive.getFilteredList(OsmPrimitive.getReferrer(nodesToDelete), Way.class)) {
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106 | ArrayList<Node> newNodes = new ArrayList<Node>(w.getNodesCount());
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107 | for (Node n: w.getNodes()) {
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108 | if (! nodesToDelete.contains(n) && n != targetNode) {
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109 | newNodes.add(n);
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110 | } else if (newNodes.isEmpty()) {
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111 | newNodes.add(targetNode);
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112 | } else if (newNodes.get(newNodes.size()-1) != targetNode) {
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113 | // make sure we collapse a sequence of deleted nodes
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114 | // to exactly one occurrence of the merged target node
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115 | //
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116 | newNodes.add(targetNode);
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117 | } else {
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118 | // drop the node
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119 | }
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120 | }
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121 | if (newNodes.size() < 2) {
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122 | if (w.getReferrers().isEmpty()) {
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123 | waysToDelete.add(w);
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124 | } else {
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125 | ButtonSpec[] options = new ButtonSpec[] {
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126 | new ButtonSpec(
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127 | tr("Abort Merging"),
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128 | ImageProvider.get("cancel"),
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129 | tr("Click to abort merging nodes"),
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130 | null /* no special help topic */
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131 | )
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132 | };
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133 | HelpAwareOptionPane.showOptionDialog(
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134 | Main.parent,
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135 | tr(
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136 | "Cannot merge nodes: Would have to delete way ''{0}'' which is still used.",
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137 | w.getDisplayName(DefaultNameFormatter.getInstance())
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138 | ),
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139 | tr("Warning"),
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140 | JOptionPane.WARNING_MESSAGE,
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141 | null, /* no icon */
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142 | options,
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143 | options[0],
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144 | ht("/Action/MergeNodes#WaysToDeleteStillInUse")
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145 | );
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146 | return null;
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147 | }
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148 | } else if(newNodes.size() < 2 && w.getReferrers().isEmpty()) {
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149 | waysToDelete.add(w);
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150 | } else {
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151 | Way newWay = new Way(w);
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152 | newWay.setNodes(newNodes);
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153 | cmds.add(new ChangeCommand(w, newWay));
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154 | }
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155 | }
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156 | if (!waysToDelete.isEmpty()) {
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157 | cmds.add(new DeleteCommand(waysToDelete));
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158 | }
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159 | return cmds;
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160 | }
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161 |
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162 | /**
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163 | * Merges the nodes in <code>nodes</code> onto one of the nodes. Uses the dataset
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164 | * managed by <code>layer</code> as reference.
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165 | *
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166 | * @param layer layer the reference data layer. Must not be null.
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167 | * @param nodes the collection of nodes. Ignored if null.
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168 | * @param targetNode the target node the collection of nodes is merged to. Must not be null.
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169 | * @throw IllegalArgumentException thrown if layer is null
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170 | */
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171 | public static Command mergeNodes(OsmDataLayer layer,Collection<Node> nodes, Node targetNode) {
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172 | CheckParameterUtil.ensureParameterNotNull(layer, "layer");
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173 | CheckParameterUtil.ensureParameterNotNull(targetNode, "targetNode");
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174 | if (nodes == null)
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175 | return null;
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176 |
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177 | Set<RelationToChildReference> relationToNodeReferences = RelationToChildReference.getRelationToChildReferences(nodes);
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178 |
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179 | // build the tag collection
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180 | //
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181 | TagCollection nodeTags = TagCollection.unionOfAllPrimitives(nodes);
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182 | combineTigerTags(nodeTags);
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183 | normalizeTagCollectionBeforeEditing(nodeTags, nodes);
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184 | TagCollection nodeTagsToEdit = new TagCollection(nodeTags);
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185 | completeTagCollectionForEditing(nodeTagsToEdit);
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186 |
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187 | // launch a conflict resolution dialog, if necessary
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188 | //
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189 | CombinePrimitiveResolverDialog dialog = CombinePrimitiveResolverDialog.getInstance();
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190 | dialog.getTagConflictResolverModel().populate(nodeTagsToEdit, nodeTags.getKeysWithMultipleValues());
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191 | dialog.getRelationMemberConflictResolverModel().populate(relationToNodeReferences);
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192 | dialog.setTargetPrimitive(targetNode);
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193 | dialog.prepareDefaultDecisions();
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194 | // conflict resolution is necessary if there are conflicts in the merged tags
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195 | // or if at least one of the merged nodes is referred to by a relation
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196 | //
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197 | if (! nodeTags.isApplicableToPrimitive() || relationToNodeReferences.size() > 1) {
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198 | dialog.setVisible(true);
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199 | if (dialog.isCancelled())
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200 | return null;
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201 | }
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202 | LinkedList<Command> cmds = new LinkedList<Command>();
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203 |
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204 | // the nodes we will have to delete
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205 | //
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206 | Collection<OsmPrimitive> nodesToDelete = new HashSet<OsmPrimitive>(nodes);
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207 | nodesToDelete.remove(targetNode);
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208 |
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209 | // fix the ways referring to at least one of the merged nodes
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210 | //
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211 | Collection<Way> waysToDelete= new HashSet<Way>();
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212 | List<Command> wayFixCommands = fixParentWays(
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213 | nodesToDelete,
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214 | targetNode
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215 | );
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216 | if (wayFixCommands == null)
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217 | return null;
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218 | cmds.addAll(wayFixCommands);
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219 |
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220 | // build the commands
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221 | //
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222 | if (!nodesToDelete.isEmpty()) {
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223 | cmds.add(new DeleteCommand(nodesToDelete));
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224 | }
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225 | if (!waysToDelete.isEmpty()) {
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226 | cmds.add(new DeleteCommand(waysToDelete));
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227 | }
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228 | cmds.addAll(dialog.buildResolutionCommands());
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229 | Command cmd = new SequenceCommand(tr("Merge {0} nodes", nodes.size()), cmds);
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230 | return cmd;
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231 | }
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232 |
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233 | @Override
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234 | protected void updateEnabledState() {
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235 | if (getCurrentDataSet() == null) {
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236 | setEnabled(false);
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237 | } else {
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238 | updateEnabledState(getCurrentDataSet().getSelected());
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239 | }
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240 | }
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241 |
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242 | @Override
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243 | protected void updateEnabledState(Collection<? extends OsmPrimitive> selection) {
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244 | if (selection == null || selection.isEmpty()) {
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245 | setEnabled(false);
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246 | return;
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247 | }
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248 | boolean ok = true;
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249 | if (selection.size() < 2) {
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250 | setEnabled(false);
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251 | return;
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252 | }
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253 | for (OsmPrimitive osm : selection) {
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254 | if (!(osm instanceof Node)) {
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255 | ok = false;
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256 | break;
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257 | }
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258 | }
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259 | setEnabled(ok);
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260 | }
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261 | }
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