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.io.PrintWriter;
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5 | import java.io.StringWriter;
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6 | import java.util.Map;
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7 |
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8 | import org.openstreetmap.josm.data.osm.Changeset;
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9 | import org.openstreetmap.josm.data.osm.Node;
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10 | import org.openstreetmap.josm.data.osm.OsmPrimitive;
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11 | import org.openstreetmap.josm.data.osm.Relation;
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12 | import org.openstreetmap.josm.data.osm.Way;
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13 | import org.openstreetmap.josm.io.OsmApi;
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14 | import org.openstreetmap.josm.io.OsmWriter;
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15 |
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16 | /**
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17 | * Creates an OsmChange document from JOSM edits.
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18 | * See http://wiki.openstreetmap.org/index.php/OsmChange for a documentation of the
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19 | * OsmChange format.
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20 | *
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21 | * @author fred
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22 | *
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23 | */
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24 | public class CreateOsmChangeVisitor extends AbstractVisitor {
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25 |
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26 | private String currentMode;
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27 | private PrintWriter writer;
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28 | private StringWriter swriter;
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29 | private OsmWriter osmwriter;
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30 | private OsmApi api;
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31 |
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32 | public CreateOsmChangeVisitor(Changeset changeset, OsmApi api) {
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33 | writer = new PrintWriter(swriter = new StringWriter());
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34 | writer.write("<osmChange version=\"");
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35 | writer.write(api.getVersion());
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36 | writer.write("\" generator=\"JOSM\">\n");
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37 | this.api = api;
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38 | // need to set osmConform = false here so that negative IDs get transmitted.
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39 | // this also enables unnecessary and (if the API were more strict) potentially
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40 | // harmful action="..." attributes.
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41 | osmwriter = new OsmWriter(writer, false, api.getVersion());
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42 | osmwriter.setChangeset(changeset);
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43 | }
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44 |
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45 | // FIXME: This should really NOT use a visitor pattern, it looks
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46 | // stupid. Just have one method named "write" instead of three "visit"s.
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47 |
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48 | public void visit(Node n) {
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49 | if (n.isDeleted()) {
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50 | switchMode("delete");
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51 | osmwriter.setWithBody(false);
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52 | osmwriter.visit(n);
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53 | } else {
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54 | switchMode(n.isNew() ? "create" : "modify");
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55 | osmwriter.setWithBody(true);
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56 | osmwriter.visit(n);
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57 | }
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58 | }
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59 | public void visit(Way w) {
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60 | if (w.isDeleted()) {
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61 | switchMode("delete");
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62 | osmwriter.setWithBody(false);
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63 | osmwriter.visit(w);
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64 | } else {
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65 | switchMode(w.isNew() ? "create" : "modify");
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66 | osmwriter.setWithBody(true);
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67 | osmwriter.visit(w);
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68 | }
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69 | }
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70 | public void visit(Relation r) {
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71 | if (r.isDeleted()) {
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72 | switchMode("delete");
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73 | osmwriter.setWithBody(false);
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74 | osmwriter.visit(r);
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75 | } else {
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76 | switchMode(r.isNew() ? "create" : "modify");
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77 | osmwriter.setWithBody(true);
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78 | osmwriter.visit(r);
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79 | }
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80 | }
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81 |
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82 | private void switchMode(String newMode) {
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83 | if ((newMode != null && !newMode.equals(currentMode))||(newMode == null && currentMode != null)) {
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84 | if (currentMode != null) {
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85 | writer.write("</");
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86 | writer.write(currentMode);
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87 | writer.write(">\n");
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88 | }
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89 | if (newMode != null) {
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90 | writer.write("<");
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91 | writer.write(newMode);
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92 | writer.write(" version=\"");
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93 | writer.write(api.getVersion());
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94 | writer.write("\" generator=\"JOSM\">\n");
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95 | }
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96 | currentMode = newMode;
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97 | }
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98 | }
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99 |
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100 | public String getDocument() {
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101 | switchMode(null);
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102 | return swriter.toString() + "</osmChange>\n";
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103 | }
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104 |
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105 | public Map<OsmPrimitive,Long> getNewIdMap() {
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106 | return osmwriter.usedNewIds;
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107 | }
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108 | }
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