1 | // License: GPL. For details, see LICENSE file.
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2 | package org.openstreetmap.josm.io;
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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.io.PrintWriter;
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7 | import java.io.StringWriter;
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8 | import java.util.Collection;
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9 |
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10 | import org.openstreetmap.josm.data.osm.Changeset;
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11 | import org.openstreetmap.josm.data.osm.IPrimitive;
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12 |
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13 | /**
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14 | * Creates an OsmChange document from JOSM edits.
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15 | * See http://wiki.openstreetmap.org/index.php/OsmChange for a documentation of the
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16 | * OsmChange format.
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17 | *
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18 | */
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19 | public class OsmChangeBuilder {
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20 | static public final String DEFAULT_API_VERSION = "0.6";
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21 |
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22 | private String currentMode;
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23 | private PrintWriter writer;
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24 | private StringWriter swriter;
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25 | private OsmWriter osmwriter;
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26 | private String apiVersion = DEFAULT_API_VERSION;
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27 | private boolean prologWritten = false;
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28 |
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29 | public OsmChangeBuilder(Changeset changeset) {
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30 | this(changeset, null /* default api version */);
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31 | }
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32 |
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33 | public OsmChangeBuilder(Changeset changeset, String apiVersion) {
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34 | this.apiVersion = apiVersion == null ? DEFAULT_API_VERSION : apiVersion;
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35 | writer = new PrintWriter(swriter = new StringWriter());
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36 | osmwriter = OsmWriterFactory.createOsmWriter(writer, false, apiVersion);
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37 | osmwriter.setChangeset(changeset);
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38 | }
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39 |
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40 | protected void write(IPrimitive p) {
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41 | if (p.isDeleted()) {
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42 | switchMode("delete");
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43 | osmwriter.setWithBody(false);
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44 | p.visit(osmwriter);
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45 | } else {
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46 | switchMode(p.isNew() ? "create" : "modify");
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47 | osmwriter.setWithBody(true);
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48 | p.visit(osmwriter);
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49 | }
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50 | }
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51 |
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52 | private void switchMode(String newMode) {
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53 | if ((newMode != null && !newMode.equals(currentMode))||(newMode == null && currentMode != null)) {
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54 | if (currentMode != null) {
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55 | writer.print("</");
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56 | writer.print(currentMode);
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57 | writer.println(">");
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58 | }
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59 | if (newMode != null) {
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60 | writer.print("<");
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61 | writer.print(newMode);
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62 | writer.println(">");
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63 | }
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64 | currentMode = newMode;
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65 | }
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66 | }
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67 |
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68 | /**
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69 | * Writes the prolog of the OsmChange document
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70 | *
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71 | * @throws IllegalStateException thrown if the prologs has already been written
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72 | */
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73 | public void start() throws IllegalStateException{
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74 | if (prologWritten)
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75 | throw new IllegalStateException(tr("Prolog of OsmChange document already written. Please write only once."));
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76 | writer.print("<osmChange version=\"");
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77 | writer.print(apiVersion);
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78 | writer.println("\" generator=\"JOSM\">");
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79 | prologWritten=true;
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80 | }
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81 |
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82 | /**
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83 | * Appends a collection of Primitives to the OsmChange document.
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84 | *
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85 | * @param primitives the collection of primitives. Ignored if null.
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86 | * @throws IllegalStateException thrown if the prologs has not been written yet
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87 | * @see #start()
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88 | * @see #append(IPrimitive)
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89 | */
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90 | public void append(Collection<? extends IPrimitive> primitives) throws IllegalStateException{
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91 | if (primitives == null) return;
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92 | if (!prologWritten)
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93 | throw new IllegalStateException(tr("Prolog of OsmChange document not written yet. Please write first."));
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94 | for (IPrimitive p : primitives) {
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95 | write(p);
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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 | * Appends an Primitive to the OsmChange document.
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101 | *
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102 | * @param p the primitive. Ignored if null.
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103 | * @throws IllegalStateException thrown if the prologs has not been written yet
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104 | * @see #start()
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105 | * @see #append(Collection)
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106 |
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107 | */
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108 | public void append(IPrimitive p) {
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109 | if (p == null) return;
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110 | if (!prologWritten)
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111 | throw new IllegalStateException(tr("Prolog of OsmChange document not written yet. Please write first."));
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112 | write(p);
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113 | }
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114 |
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115 | /**
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116 | * Writes the epilog of the OsmChange document
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117 | *
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118 | * @throws IllegalStateException thrown if the prologs has not been written yet
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119 | */
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120 | public void finish() throws IllegalStateException {
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121 | if (!prologWritten)
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122 | throw new IllegalStateException(tr("Prolog of OsmChange document not written yet. Please write first."));
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123 | if (currentMode != null) {
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124 | writer.print("</");
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125 | writer.print(currentMode);
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126 | writer.println(">");
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127 | }
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128 | writer.println("</osmChange>");
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129 | }
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130 |
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131 | public String getDocument() {
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132 | return swriter.toString();
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133 | }
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134 | }
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