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.IOException;
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6 | import java.io.InputStream;
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7 | import java.io.InputStreamReader;
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8 | import java.text.ParseException;
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9 | import java.util.Arrays;
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10 | import java.util.Collection;
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11 | import java.util.HashMap;
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12 | import java.util.HashSet;
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13 | import java.util.LinkedList;
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14 | import java.util.Map;
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15 | import java.util.Map.Entry;
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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.coor.LatLon;
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19 | import org.openstreetmap.josm.data.osm.DataSet;
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20 | import org.openstreetmap.josm.data.osm.Node;
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21 | import org.openstreetmap.josm.data.osm.OsmPrimitive;
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22 | import org.openstreetmap.josm.data.osm.Segment;
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23 | import org.openstreetmap.josm.data.osm.User;
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24 | import org.openstreetmap.josm.data.osm.Way;
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25 | import org.openstreetmap.josm.data.osm.visitor.AddVisitor;
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26 | import org.openstreetmap.josm.data.osm.visitor.Visitor;
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27 | import org.openstreetmap.josm.gui.PleaseWaitDialog;
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28 | import org.openstreetmap.josm.tools.DateParser;
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29 | import org.xml.sax.Attributes;
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30 | import org.xml.sax.SAXException;
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31 |
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32 | import uk.co.wilson.xml.MinML2;
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33 |
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34 | /**
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35 | * Parser for the Osm Api. Read from an input stream and construct a dataset out of it.
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36 | *
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37 | * Reading process takes place in three phases. During the first phase (including xml parse),
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38 | * all nodes are read and stored. Other information than nodes are stored in a raw list
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39 | *
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40 | * The second phase reads from the raw list all segments and create Segment objects.
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41 | *
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42 | * The third phase read all ways out of the remaining objects in the raw list.
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43 | *
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44 | * @author Imi
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45 | */
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46 | public class OsmReader {
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47 |
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48 | /**
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49 | * This is used as (readonly) source for finding missing references when not transferred in the
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50 | * file.
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51 | */
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52 | private DataSet references;
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53 |
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54 | /**
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55 | * The dataset to add parsed objects to.
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56 | */
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57 | private DataSet ds = new DataSet();
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58 |
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59 | /**
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60 | * The visitor to use to add the data to the set.
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61 | */
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62 | private AddVisitor adder = new AddVisitor(ds);
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63 |
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64 | /**
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65 | * All read nodes after phase 1.
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66 | */
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67 | private Map<Long, Node> nodes = new HashMap<Long, Node>();
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68 |
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69 | private static class OsmPrimitiveData extends OsmPrimitive {
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70 | @Override public void visit(Visitor visitor) {}
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71 | public int compareTo(OsmPrimitive o) {return 0;}
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72 |
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73 | public void copyTo(OsmPrimitive osm) {
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74 | osm.id = id;
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75 | osm.keys = keys;
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76 | osm.modified = modified;
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77 | osm.selected = selected;
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78 | osm.deleted = deleted;
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79 | osm.timestamp = timestamp;
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80 | osm.user = user;
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81 | osm.visible = visible;
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82 | }
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83 | }
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84 |
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85 | /**
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86 | * Data structure for the remaining segment objects
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87 | * Maps the raw attributes to key/value pairs.
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88 | */
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89 | private Map<OsmPrimitiveData, long[]> segs = new HashMap<OsmPrimitiveData, long[]>();
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90 |
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91 | /**
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92 | * Data structure for the remaining way objects
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93 | */
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94 | private Map<OsmPrimitiveData, Collection<Long>> ways = new HashMap<OsmPrimitiveData, Collection<Long>>();
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95 |
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96 | /**
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97 | * List of protocol versions that will be accepted on reading
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98 | */
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99 | private HashSet<String> allowedVersions = new HashSet<String>();
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100 |
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101 | private class Parser extends MinML2 {
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102 | /**
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103 | * The current osm primitive to be read.
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104 | */
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105 | private OsmPrimitive current;
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106 |
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107 | @Override public void startElement(String namespaceURI, String localName, String qName, Attributes atts) throws SAXException {
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108 | try {
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109 | if (qName.equals("osm")) {
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110 | if (atts == null)
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111 | throw new SAXException(tr("Unknown version"));
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112 | if (!allowedVersions.contains(atts.getValue("version")))
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113 | throw new SAXException(tr("Unknown version")+": "+atts.getValue("version"));
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114 | } else if (qName.equals("node")) {
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115 | current = new Node(new LatLon(getDouble(atts, "lat"), getDouble(atts, "lon")));
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116 | readCommon(atts, current);
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117 | nodes.put(current.id, (Node)current);
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118 | } else if (qName.equals("segment")) {
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119 | current = new OsmPrimitiveData();
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120 | readCommon(atts, current);
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121 | segs.put((OsmPrimitiveData)current, new long[]{getLong(atts, "from"), getLong(atts, "to")});
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122 | } else if (qName.equals("way")) {
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123 | current = new OsmPrimitiveData();
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124 | readCommon(atts, current);
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125 | ways.put((OsmPrimitiveData)current, new LinkedList<Long>());
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126 | } else if (qName.equals("seg")) {
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127 | Collection<Long> list = ways.get(current);
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128 | if (list == null)
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129 | throw new SAXException(tr("Found <seg> tag on non-way."));
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130 | long id = getLong(atts, "id");
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131 | if (id == 0)
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132 | throw new SAXException(tr("Incomplete segment with id=0"));
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133 | list.add(id);
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134 | } else if (qName.equals("tag"))
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135 | current.put(atts.getValue("k"), atts.getValue("v"));
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136 | } catch (NumberFormatException x) {
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137 | x.printStackTrace(); // SAXException does not chain correctly
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138 | throw new SAXException(x.getMessage(), x);
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139 | } catch (NullPointerException x) {
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140 | x.printStackTrace(); // SAXException does not chain correctly
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141 | throw new SAXException(tr("NullPointerException, Possibly some missing tags."), x);
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142 | }
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143 | }
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144 |
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145 | private double getDouble(Attributes atts, String value) {
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146 | return Double.parseDouble(atts.getValue(value));
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147 | }
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148 | }
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149 |
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150 | /**
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151 | * Constructor initializes list of allowed protocol versions.
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152 | */
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153 | public OsmReader() {
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154 | // first add the main server version
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155 | allowedVersions.add(Main.pref.get("osm-server.version", "0.4"));
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156 | // now also add all compatible versions
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157 | String[] additionalVersions =
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158 | Main.pref.get("osm-server.additional-versions", "0.3").split("/,/");
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159 | allowedVersions.addAll(Arrays.asList(additionalVersions));
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160 | }
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161 |
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162 | /**
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163 | * Read out the common attributes from atts and put them into this.current.
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164 | */
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165 | void readCommon(Attributes atts, OsmPrimitive current) throws SAXException {
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166 | current.id = getLong(atts, "id");
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167 | if (current.id == 0)
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168 | throw new SAXException(tr("Illegal object with id=0"));
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169 |
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170 | String time = atts.getValue("timestamp");
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171 | if (time != null && time.length() != 0) {
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172 | try {
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173 | current.timestamp = DateParser.parse(time);
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174 | } catch (ParseException e) {
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175 | e.printStackTrace();
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176 | throw new SAXException(tr("Couldn't read time format \"{0}\".",time));
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177 | }
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178 | }
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179 |
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180 | // user attribute added in 0.4 API
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181 | String user = atts.getValue("user");
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182 | if (user != null) {
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183 | // do not store literally; get object reference for string
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184 | current.user = User.get(user);
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185 | }
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186 |
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187 | // visible attribute added in 0.4 API
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188 | String visible = atts.getValue("visible");
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189 | if (visible != null) {
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190 | current.visible = Boolean.parseBoolean(visible);
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191 | }
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192 |
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193 | String action = atts.getValue("action");
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194 | if (action == null)
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195 | return;
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196 | if (action.equals("delete"))
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197 | current.delete(true);
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198 | else if (action.startsWith("modify"))
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199 | current.modified = true;
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200 | }
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201 | private long getLong(Attributes atts, String value) throws SAXException {
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202 | String s = atts.getValue(value);
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203 | if (s == null)
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204 | throw new SAXException(tr("Missing required attribute \"{0}\".",value));
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205 | return Long.parseLong(s);
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206 | }
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207 |
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208 | private void createSegments() {
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209 | for (Entry<OsmPrimitiveData, long[]> e : segs.entrySet()) {
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210 | Node from = findNode(e.getValue()[0]);
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211 | Node to = findNode(e.getValue()[1]);
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212 | if (from == null || to == null)
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213 | continue; //TODO: implement support for incomplete nodes.
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214 | Segment s = new Segment(from, to);
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215 | e.getKey().copyTo(s);
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216 | segments.put(s.id, s);
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217 | adder.visit(s);
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218 | }
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219 | }
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220 |
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221 | private Node findNode(long id) {
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222 | Node n = nodes.get(id);
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223 | if (n != null)
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224 | return n;
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225 | for (Node node : references.nodes)
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226 | if (node.id == id)
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227 | return node;
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228 | // TODO: This has to be changed to support multiple layers.
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229 | for (Node node : Main.ds.nodes)
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230 | if (node.id == id)
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231 | return node;
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232 | return null;
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233 | }
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234 |
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235 | private Segment findSegment(long id) {
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236 | Segment s = segments.get(id);
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237 | if (s != null)
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238 | return s;
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239 | for (Segment seg : references.segments)
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240 | if (seg.id == id)
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241 | return seg;
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242 | // TODO: This has to be changed to support multiple layers.
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243 | for (Segment seg : Main.ds.segments)
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244 | if (seg.id == id)
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245 | return seg;
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246 | return null;
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247 | }
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248 |
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249 | private void createWays() {
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250 | for (Entry<OsmPrimitiveData, Collection<Long>> e : ways.entrySet()) {
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251 | Way w = new Way();
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252 | for (long id : e.getValue()) {
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253 | Segment s = findSegment(id);
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254 | if (s == null) {
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255 | s = new Segment(id); // incomplete line segment
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256 | adder.visit(s);
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257 | }
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258 | w.segments.add(s);
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259 | }
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260 | e.getKey().copyTo(w);
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261 | adder.visit(w);
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262 | }
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263 | }
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264 |
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265 | /**
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266 | * All read segments after phase 2.
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267 | */
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268 | private Map<Long, Segment> segments = new HashMap<Long, Segment>();
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269 |
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270 | /**
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271 | * Parse the given input source and return the dataset.
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272 | * @param ref The dataset that is search in for references first. If
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273 | * the Reference is not found here, Main.ds is searched.
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274 | * TODO: This has to be changed to support multiple layers.
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275 | */
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276 | public static DataSet parseDataSet(InputStream source, DataSet ref, PleaseWaitDialog pleaseWaitDlg) throws SAXException, IOException {
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277 | OsmReader osm = new OsmReader();
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278 | osm.references = ref == null ? new DataSet() : ref;
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279 |
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280 | // phase 1: Parse nodes and read in raw segments and ways
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281 | osm.new Parser().parse(new InputStreamReader(source, "UTF-8"));
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282 | if (pleaseWaitDlg != null) {
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283 | pleaseWaitDlg.progress.setValue(0);
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284 | pleaseWaitDlg.currentAction.setText(tr("Preparing data..."));
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285 | }
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286 | for (Node n : osm.nodes.values())
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287 | osm.adder.visit(n);
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288 |
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289 | try {
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290 | osm.createSegments();
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291 | osm.createWays();
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292 | } catch (NumberFormatException e) {
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293 | e.printStackTrace();
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294 | throw new SAXException(tr("Illformed Node id"));
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295 | }
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296 |
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297 | // clear all negative ids (new to this file)
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298 | for (OsmPrimitive o : osm.ds.allPrimitives())
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299 | if (o.id < 0)
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300 | o.id = 0;
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301 |
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302 | return osm.ds;
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303 | }
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304 | }
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