1 | // License: GPL. For details, see LICENSE file.
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2 | package org.openstreetmap.josm.gui.dialogs.relation;
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3 |
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4 | import static org.openstreetmap.josm.tools.I18n.tr;
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5 |
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6 | import java.awt.Component;
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7 | import java.awt.Dialog;
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8 | import java.io.IOException;
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9 |
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10 | import javax.swing.JTree;
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11 | import javax.swing.SwingUtilities;
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12 | import javax.swing.event.TreeExpansionEvent;
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13 | import javax.swing.event.TreeWillExpandListener;
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14 | import javax.swing.tree.ExpandVetoException;
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15 | import javax.swing.tree.TreePath;
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16 |
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17 | import org.openstreetmap.josm.Main;
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18 | import org.openstreetmap.josm.data.osm.DataSet;
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19 | import org.openstreetmap.josm.data.osm.DataSetMerger;
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20 | import org.openstreetmap.josm.data.osm.OsmPrimitiveType;
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21 | import org.openstreetmap.josm.data.osm.Relation;
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22 | import org.openstreetmap.josm.gui.PleaseWaitRunnable;
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23 | import org.openstreetmap.josm.gui.progress.PleaseWaitProgressMonitor;
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24 | import org.openstreetmap.josm.gui.progress.ProgressMonitor;
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25 | import org.openstreetmap.josm.io.OsmApi;
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26 | import org.openstreetmap.josm.io.OsmServerObjectReader;
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27 | import org.openstreetmap.josm.io.OsmTransferException;
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28 | import org.xml.sax.SAXException;
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29 |
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30 | /**
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31 | * This is a {@see JTree} rendering the hierarchical structure of {@see Relation}s.
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32 | *
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33 | * @see RelationTreeModel
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34 | */
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35 | public class RelationTree extends JTree {
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36 | /**
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37 | * builds the UI
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38 | */
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39 | protected void build() {
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40 | setRootVisible(false);
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41 | setCellRenderer(new RelationTreeCellRenderer());
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42 | addTreeWillExpandListener(new LazyRelationLoader());
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43 | }
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44 |
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45 | /**
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46 | * constructor
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47 | */
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48 | public RelationTree(){
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49 | super();
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50 | build();
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51 | }
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52 |
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53 | /**
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54 | * constructor
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55 | * @param model the tree model
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56 | */
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57 | public RelationTree(RelationTreeModel model) {
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58 | super(model);
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59 | build();
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60 | }
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61 |
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62 | /**
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63 | * replies the parent dialog this tree is embedded in.
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64 | *
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65 | * @return the parent dialog; null, if there is no parent dialog
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66 | */
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67 | protected Dialog getParentDialog() {
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68 | Component c = RelationTree.this;
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69 | while(c != null && ! (c instanceof Dialog)) {
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70 | c = c.getParent();
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71 | }
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72 | return (Dialog)c;
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73 | }
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74 |
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75 | /**
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76 | * An adapter for TreeWillExpand-events. If a node is to be expanded which is
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77 | * not loaded yet this will trigger asynchronous loading of the respective
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78 | * relation.
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79 | *
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80 | */
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81 | class LazyRelationLoader implements TreeWillExpandListener {
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82 |
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83 | public void treeWillCollapse(TreeExpansionEvent event) throws ExpandVetoException {
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84 | // do nothing
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85 | }
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86 |
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87 | public void treeWillExpand(TreeExpansionEvent event) throws ExpandVetoException {
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88 | TreePath path = event.getPath();
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89 | Relation parent = (Relation)event.getPath().getLastPathComponent();
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90 | if (! parent.isIncomplete() || parent.isNew())
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91 | // we don't load complete or new relations
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92 | return;
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93 | // launch the download task
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94 | //
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95 | Main.worker.submit(new RelationLoader(getParentDialog(),parent, path));
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96 | }
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97 | }
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98 |
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99 | /**
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100 | * Asynchronous download task for a specific relation
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101 | *
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102 | */
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103 | class RelationLoader extends PleaseWaitRunnable {
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104 | private boolean cancelled;
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105 | private Exception lastException;
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106 | private Relation relation;
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107 | private DataSet ds;
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108 | private TreePath path;
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109 |
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110 | public RelationLoader(Dialog dialog, Relation relation, TreePath path) {
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111 | super(
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112 | tr("Load relation"),
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113 | new PleaseWaitProgressMonitor(
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114 | dialog
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115 | ),
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116 | false /* don't ignore exceptions */
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117 | );
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118 | this.relation = relation;
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119 | this.path = path;
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120 | }
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121 | @Override
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122 | protected void cancel() {
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123 | OsmApi.getOsmApi().cancel();
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124 | this.cancelled = true;
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125 | }
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126 |
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127 | @Override
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128 | protected void finish() {
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129 | if (cancelled)
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130 | return;
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131 | if (lastException != null) {
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132 | lastException.printStackTrace();
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133 | return;
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134 | }
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135 | DataSetMerger visitor = new DataSetMerger(Main.main.getEditLayer().data, ds);
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136 | visitor.merge();
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137 | if (! visitor.getConflicts().isEmpty()) {
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138 | Main.main.getEditLayer().getConflicts().add(visitor.getConflicts());
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139 | }
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140 | final RelationTreeModel model = (RelationTreeModel)getModel();
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141 | SwingUtilities.invokeLater(
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142 | new Runnable() {
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143 | public void run() {
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144 | model.refreshNode(path);
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145 | }
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146 | }
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147 | );
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148 | }
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149 |
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150 | @Override
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151 | protected void realRun() throws SAXException, IOException, OsmTransferException {
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152 | try {
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153 | OsmServerObjectReader reader = new OsmServerObjectReader(relation.getId(), OsmPrimitiveType.from(relation), true /* full load */);
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154 | ds = reader.parseOsm(progressMonitor
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155 | .createSubTaskMonitor(ProgressMonitor.ALL_TICKS, false));
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156 | } catch(Exception e) {
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157 | if (cancelled) {
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158 | System.out.println(tr("Warning: ignoring exception because task was cancelled. Exception was: {0}", e.toString()));
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159 | return;
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160 | }
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161 | this.lastException = e;
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162 | }
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163 | }
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164 | }
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165 | }
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