1 | package org.openstreetmap.josm.io;
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2 |
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3 | import static org.openstreetmap.josm.tools.I18n.tr;
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4 |
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5 | import java.io.InputStream;
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6 |
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7 | import javax.xml.stream.XMLStreamConstants;
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8 | import javax.xml.stream.XMLStreamException;
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9 |
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10 | import org.openstreetmap.josm.data.osm.DataSet;
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11 | import org.openstreetmap.josm.data.osm.OsmPrimitive;
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12 | import org.openstreetmap.josm.gui.progress.ProgressMonitor;
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13 |
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14 | public class OsmChangeReader extends OsmReader {
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15 |
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16 | /**
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17 | * constructor (for private and subclasses use only)
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18 | *
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19 | * @see #parseDataSet(InputStream, DataSet, ProgressMonitor)
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20 | */
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21 | protected OsmChangeReader() {
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22 | }
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23 |
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24 | /* (non-Javadoc)
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25 | * @see org.openstreetmap.josm.io.OsmReader#parseRoot()
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26 | */
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27 | @Override
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28 | protected void parseRoot() throws XMLStreamException {
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29 | if (parser.getLocalName().equals("osmChange")) {
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30 | parseOsmChange();
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31 | } else {
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32 | parseUnknown();
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33 | }
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34 | }
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35 |
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36 | private void parseOsmChange() throws XMLStreamException {
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37 | String v = parser.getAttributeValue(null, "version");
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38 | if (v == null) {
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39 | throwException(tr("Missing mandatory attribute ''{0}''.", "version"));
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40 | }
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41 | if (!v.equals("0.6")) {
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42 | throwException(tr("Unsupported version: {0}", v));
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43 | }
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44 | ds.setVersion(v);
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45 | while (parser.hasNext()) {
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46 | int event = parser.next();
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47 | if (event == XMLStreamConstants.START_ELEMENT) {
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48 | if (parser.getLocalName().equals("create")) {
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49 | parseCreate();
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50 | } else if (parser.getLocalName().equals("modify")) {
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51 | parseModify();
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52 | } else if (parser.getLocalName().equals("delete")) {
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53 | parseDelete();
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54 | } else {
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55 | parseUnknown();
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56 | }
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57 | } else if (event == XMLStreamConstants.END_ELEMENT) {
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58 | return;
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59 | }
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60 | }
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61 | }
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62 |
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63 | private void parseDelete() throws XMLStreamException {
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64 | parseCommon(true);
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65 | }
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66 |
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67 | private void parseModify() throws XMLStreamException {
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68 | parseCommon(false);
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69 | }
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70 |
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71 | private void parseCreate() throws XMLStreamException {
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72 | parseCommon(false);
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73 | }
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74 |
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75 | private void parseCommon(boolean deletePrimitive) throws XMLStreamException {
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76 | while (parser.hasNext()) {
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77 | int event = parser.next();
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78 | if (event == XMLStreamConstants.START_ELEMENT) {
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79 | OsmPrimitive p = null;
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80 | if (parser.getLocalName().equals("node")) {
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81 | p = parseNode();
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82 | } else if (parser.getLocalName().equals("way")) {
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83 | p = parseWay();
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84 | } else if (parser.getLocalName().equals("relation")) {
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85 | p = parseRelation();
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86 | } else {
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87 | parseUnknown();
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88 | }
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89 | if (p != null && deletePrimitive) {
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90 | p.setDeleted(true);
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91 | }
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92 | } else if (event == XMLStreamConstants.END_ELEMENT) {
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93 | return;
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94 | }
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95 | }
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96 | }
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97 |
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98 | /**
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99 | * Parse the given input source and return the dataset.
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100 | *
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101 | * @param source the source input stream. Must not be null.
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102 | * @param progressMonitor the progress monitor. If null, {@link NullProgressMonitor#INSTANCE} is assumed
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103 | *
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104 | * @return the dataset with the parsed data
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105 | * @throws IllegalDataException thrown if the an error was found while parsing the data from the source
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106 | * @throws IllegalArgumentException thrown if source is null
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107 | */
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108 | public static DataSet parseDataSet(InputStream source, ProgressMonitor progressMonitor) throws IllegalDataException {
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109 | return new OsmChangeReader().doParseDataSet(source, progressMonitor);
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110 | }
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111 | }
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