1 | // License: GPL. Copyright 2007 by Immanuel Scholz and others |
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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.IOException; |
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7 | import java.io.InputStream; |
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8 | import java.io.InputStreamReader; |
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9 | import java.text.ParseException; |
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10 | import java.util.Arrays; |
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11 | import java.util.Collection; |
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12 | import java.util.HashMap; |
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13 | import java.util.HashSet; |
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14 | import java.util.LinkedList; |
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15 | import java.util.Map; |
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16 | import java.util.Map.Entry; |
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17 | |
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18 | import javax.xml.parsers.ParserConfigurationException; |
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19 | import javax.xml.parsers.SAXParserFactory; |
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20 | |
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21 | import org.openstreetmap.josm.Main; |
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22 | import org.openstreetmap.josm.data.Bounds; |
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23 | import org.openstreetmap.josm.data.coor.LatLon; |
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24 | import org.openstreetmap.josm.data.osm.DataSet; |
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25 | import org.openstreetmap.josm.data.osm.DataSource; |
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26 | import org.openstreetmap.josm.data.osm.Relation; |
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27 | import org.openstreetmap.josm.data.osm.RelationMember; |
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28 | import org.openstreetmap.josm.data.osm.Node; |
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29 | import org.openstreetmap.josm.data.osm.OsmPrimitive; |
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30 | import org.openstreetmap.josm.data.osm.User; |
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31 | import org.openstreetmap.josm.data.osm.Way; |
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32 | import org.openstreetmap.josm.data.osm.visitor.AddVisitor; |
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33 | import org.openstreetmap.josm.data.osm.visitor.Visitor; |
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34 | import org.openstreetmap.josm.gui.PleaseWaitDialog; |
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35 | import org.openstreetmap.josm.tools.DateParser; |
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36 | import org.xml.sax.Attributes; |
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37 | import org.xml.sax.InputSource; |
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38 | import org.xml.sax.SAXException; |
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39 | import org.xml.sax.helpers.DefaultHandler; |
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40 | |
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41 | /** |
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42 | * Parser for the Osm Api. Read from an input stream and construct a dataset out of it. |
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43 | * |
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44 | * Reading process takes place in three phases. During the first phase (including xml parse), |
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45 | * all nodes are read and stored. Other information than nodes are stored in a raw list |
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46 | * |
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47 | * The second phase read all ways out of the remaining objects in the raw list. |
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48 | * |
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49 | * @author Imi |
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50 | */ |
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51 | public class OsmReader { |
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52 | |
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53 | /** |
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54 | * This is used as (readonly) source for finding missing references when not transferred in the |
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55 | * file. |
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56 | */ |
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57 | private DataSet references; |
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58 | |
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59 | /** |
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60 | * The dataset to add parsed objects to. |
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61 | */ |
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62 | private DataSet ds = new DataSet(); |
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63 | |
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64 | /** |
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65 | * The visitor to use to add the data to the set. |
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66 | */ |
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67 | private AddVisitor adder = new AddVisitor(ds); |
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68 | |
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69 | /** |
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70 | * All read nodes after phase 1. |
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71 | */ |
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72 | private Map<Long, Node> nodes = new HashMap<Long, Node>(); |
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73 | |
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74 | // TODO: What the hack? Is this really from me? Please, clean this up! |
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75 | private static class OsmPrimitiveData extends OsmPrimitive { |
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76 | @Override public void visit(Visitor visitor) {} |
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77 | public int compareTo(OsmPrimitive o) {return 0;} |
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78 | |
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79 | public void copyTo(OsmPrimitive osm) { |
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80 | osm.id = id; |
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81 | osm.keys = keys; |
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82 | osm.modified = modified; |
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83 | osm.selected = selected; |
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84 | osm.deleted = deleted; |
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85 | osm.timestamp = timestamp; |
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86 | osm.user = user; |
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87 | osm.visible = visible; |
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88 | } |
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89 | } |
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90 | |
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91 | /** |
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92 | * Used as a temporary storage for relation members, before they |
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93 | * are resolved into pointers to real objects. |
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94 | */ |
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95 | private static class RelationMemberData { |
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96 | public String type; |
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97 | public long id; |
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98 | public RelationMember relationMember; |
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99 | } |
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100 | |
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101 | /** |
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102 | * Data structure for the remaining way objects |
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103 | */ |
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104 | private Map<OsmPrimitiveData, Collection<Long>> ways = new HashMap<OsmPrimitiveData, Collection<Long>>(); |
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105 | |
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106 | /** |
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107 | * Data structure for relation objects |
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108 | */ |
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109 | private Map<OsmPrimitiveData, Collection<RelationMemberData>> relations = new HashMap<OsmPrimitiveData, Collection<RelationMemberData>>(); |
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110 | |
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111 | /** |
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112 | * List of protocol versions that will be accepted on reading |
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113 | */ |
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114 | private HashSet<String> allowedVersions = new HashSet<String>(); |
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115 | |
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116 | private class Parser extends DefaultHandler { |
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117 | /** |
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118 | * The current osm primitive to be read. |
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119 | */ |
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120 | private OsmPrimitive current; |
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121 | |
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122 | @Override public void startElement(String namespaceURI, String localName, String qName, Attributes atts) throws SAXException { |
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123 | try { |
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124 | if (qName.equals("osm")) { |
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125 | if (atts == null) |
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126 | throw new SAXException(tr("Unknown version")); |
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127 | if (!allowedVersions.contains(atts.getValue("version"))) |
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128 | throw new SAXException(tr("Unknown version")+": "+atts.getValue("version")); |
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129 | } else if (qName.equals("bound")) { |
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130 | String bbox = atts.getValue("box"); |
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131 | String origin = atts.getValue("origin"); |
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132 | if (bbox != null) { |
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133 | String[] b = bbox.split(","); |
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134 | Bounds bounds = null; |
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135 | if (b.length == 4) |
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136 | bounds = new Bounds( |
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137 | new LatLon(Double.parseDouble(b[0]),Double.parseDouble(b[1])), |
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138 | new LatLon(Double.parseDouble(b[2]),Double.parseDouble(b[3]))); |
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139 | DataSource src = new DataSource(bounds, origin); |
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140 | ds.dataSources.add(src); |
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141 | } |
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142 | |
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143 | // ---- PARSING NODES AND WAYS ---- |
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144 | |
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145 | } else if (qName.equals("node")) { |
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146 | current = new Node(new LatLon(getDouble(atts, "lat"), getDouble(atts, "lon"))); |
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147 | readCommon(atts, current); |
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148 | nodes.put(current.id, (Node)current); |
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149 | } else if (qName.equals("way")) { |
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150 | current = new OsmPrimitiveData(); |
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151 | readCommon(atts, current); |
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152 | ways.put((OsmPrimitiveData)current, new LinkedList<Long>()); |
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153 | } else if (qName.equals("nd")) { |
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154 | Collection<Long> list = ways.get(current); |
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155 | if (list == null) |
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156 | throw new SAXException(tr("Found <nd> element in non-way.")); |
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157 | long id = getLong(atts, "ref"); |
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158 | if (id == 0) |
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159 | throw new SAXException(tr("<nd> has zero ref")); |
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160 | list.add(id); |
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161 | |
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162 | // ---- PARSING ENTITIES ---- |
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163 | |
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164 | } else if (qName.equals("relation")) { |
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165 | current = new OsmPrimitiveData(); |
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166 | readCommon(atts, current); |
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167 | relations.put((OsmPrimitiveData)current, new LinkedList<RelationMemberData>()); |
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168 | } else if (qName.equals("member")) { |
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169 | Collection<RelationMemberData> list = relations.get(current); |
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170 | if (list == null) |
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171 | throw new SAXException(tr("Found <member> tag on non-relation.")); |
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172 | RelationMemberData emd = new RelationMemberData(); |
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173 | emd.relationMember = new RelationMember(); |
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174 | emd.id = getLong(atts, "ref"); |
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175 | emd.type=atts.getValue("type"); |
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176 | emd.relationMember.role = atts.getValue("role"); |
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177 | |
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178 | if (emd.id == 0) |
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179 | throw new SAXException(tr("Incomplete <member> specification with ref=0")); |
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180 | |
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181 | list.add(emd); |
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182 | |
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183 | // ---- PARSING TAGS (applicable to all objects) ---- |
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184 | |
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185 | } else if (qName.equals("tag")) { |
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186 | current.put(atts.getValue("k"), atts.getValue("v")); |
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187 | } |
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188 | } catch (NumberFormatException x) { |
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189 | x.printStackTrace(); // SAXException does not chain correctly |
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190 | throw new SAXException(x.getMessage(), x); |
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191 | } catch (NullPointerException x) { |
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192 | x.printStackTrace(); // SAXException does not chain correctly |
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193 | throw new SAXException(tr("NullPointerException, Possibly some missing tags."), x); |
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194 | } |
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195 | } |
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196 | |
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197 | private double getDouble(Attributes atts, String value) { |
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198 | return Double.parseDouble(atts.getValue(value)); |
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199 | } |
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200 | } |
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201 | |
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202 | /** |
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203 | * Constructor initializes list of allowed protocol versions. |
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204 | */ |
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205 | public OsmReader() { |
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206 | // first add the main server version |
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207 | allowedVersions.add(Main.pref.get("osm-server.version", "0.5")); |
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208 | // now also add all compatible versions |
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209 | String[] additionalVersions = |
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210 | Main.pref.get("osm-server.additional-versions", "").split("/,/"); |
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211 | if (additionalVersions.length == 1 && additionalVersions[0].length() == 0) |
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212 | additionalVersions = new String[] {}; |
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213 | allowedVersions.addAll(Arrays.asList(additionalVersions)); |
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214 | } |
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215 | |
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216 | /** |
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217 | * Read out the common attributes from atts and put them into this.current. |
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218 | */ |
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219 | void readCommon(Attributes atts, OsmPrimitive current) throws SAXException { |
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220 | current.id = getLong(atts, "id"); |
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221 | if (current.id == 0) |
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222 | throw new SAXException(tr("Illegal object with id=0")); |
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223 | |
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224 | String time = atts.getValue("timestamp"); |
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225 | if (time != null && time.length() != 0) { |
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226 | try { |
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227 | current.timestamp = DateParser.parse(time); |
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228 | } catch (ParseException e) { |
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229 | e.printStackTrace(); |
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230 | throw new SAXException(tr("Couldn't read time format \"{0}\".",time)); |
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231 | } |
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232 | } |
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233 | |
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234 | // user attribute added in 0.4 API |
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235 | String user = atts.getValue("user"); |
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236 | if (user != null) { |
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237 | // do not store literally; get object reference for string |
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238 | current.user = User.get(user); |
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239 | } |
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240 | |
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241 | // visible attribute added in 0.4 API |
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242 | String visible = atts.getValue("visible"); |
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243 | if (visible != null) { |
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244 | current.visible = Boolean.parseBoolean(visible); |
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245 | } |
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246 | |
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247 | String action = atts.getValue("action"); |
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248 | if (action == null) |
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249 | return; |
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250 | if (action.equals("delete")) |
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251 | current.delete(true); |
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252 | else if (action.startsWith("modify")) |
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253 | current.modified = true; |
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254 | } |
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255 | private long getLong(Attributes atts, String value) throws SAXException { |
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256 | String s = atts.getValue(value); |
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257 | if (s == null) |
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258 | throw new SAXException(tr("Missing required attribute \"{0}\".",value)); |
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259 | return Long.parseLong(s); |
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260 | } |
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261 | |
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262 | private Node findNode(long id) { |
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263 | Node n = nodes.get(id); |
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264 | if (n != null) |
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265 | return n; |
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266 | for (Node node : references.nodes) |
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267 | if (node.id == id) |
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268 | return node; |
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269 | // TODO: This has to be changed to support multiple layers. |
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270 | for (Node node : Main.ds.nodes) |
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271 | if (node.id == id) |
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272 | return new Node(node); |
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273 | return null; |
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274 | } |
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275 | |
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276 | private void createWays() { |
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277 | for (Entry<OsmPrimitiveData, Collection<Long>> e : ways.entrySet()) { |
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278 | Way w = new Way(); |
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279 | boolean failed = false; |
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280 | for (long id : e.getValue()) { |
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281 | Node n = findNode(id); |
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282 | if (n == null) { |
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283 | failed = true; |
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284 | break; |
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285 | } |
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286 | w.nodes.add(n); |
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287 | } |
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288 | if (failed) continue; |
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289 | e.getKey().copyTo(w); |
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290 | adder.visit(w); |
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291 | } |
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292 | } |
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293 | |
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294 | /** |
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295 | * Return the Way object with the given id, or null if it doesn't |
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296 | * exist yet. This method only looks at ways stored in the data set. |
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297 | * |
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298 | * @param id |
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299 | * @return way object or null |
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300 | */ |
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301 | private Way findWay(long id) { |
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302 | for (Way wy : ds.ways) |
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303 | if (wy.id == id) |
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304 | return wy; |
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305 | for (Way wy : Main.ds.ways) |
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306 | if (wy.id == id) |
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307 | return wy; |
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308 | return null; |
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309 | } |
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310 | |
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311 | /** |
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312 | * Return the Relation object with the given id, or null if it doesn't |
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313 | * exist yet. This method only looks at relations stored in the data set. |
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314 | * |
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315 | * @param id |
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316 | * @return relation object or null |
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317 | */ |
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318 | private Relation findRelation(long id) { |
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319 | for (Relation e : ds.relations) |
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320 | if (e.id == id) |
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321 | return e; |
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322 | for (Relation e : Main.ds.relations) |
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323 | if (e.id == id) |
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324 | return e; |
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325 | return null; |
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326 | } |
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327 | |
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328 | /** |
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329 | * Create relations. This is slightly different than n/s/w because |
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330 | * unlike other objects, relations may reference other relations; it |
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331 | * is not guaranteed that a referenced relation will have been created |
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332 | * before it is referenced. So we have to create all relations first, |
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333 | * and populate them later. |
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334 | */ |
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335 | private void createRelations() { |
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336 | |
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337 | // pass 1 - create all relations |
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338 | for (Entry<OsmPrimitiveData, Collection<RelationMemberData>> e : relations.entrySet()) { |
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339 | Relation en = new Relation(); |
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340 | e.getKey().copyTo(en); |
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341 | adder.visit(en); |
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342 | } |
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343 | |
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344 | // pass 2 - sort out members |
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345 | for (Entry<OsmPrimitiveData, Collection<RelationMemberData>> e : relations.entrySet()) { |
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346 | Relation en = findRelation(e.getKey().id); |
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347 | if (en == null) throw new Error("Failed to create relation " + e.getKey().id); |
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348 | |
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349 | for (RelationMemberData emd : e.getValue()) { |
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350 | RelationMember em = emd.relationMember; |
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351 | if (emd.type.equals("node")) { |
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352 | em.member = findNode(emd.id); |
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353 | if (em.member == null) { |
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354 | em.member = new Node(emd.id); |
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355 | adder.visit((Node)em.member); |
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356 | } |
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357 | } else if (emd.type.equals("way")) { |
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358 | em.member = findWay(emd.id); |
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359 | if (em.member == null) { |
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360 | em.member = new Way(emd.id); |
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361 | adder.visit((Way)em.member); |
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362 | } |
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363 | } else if (emd.type.equals("relation")) { |
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364 | em.member = findRelation(emd.id); |
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365 | if (em.member == null) { |
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366 | em.member = new Relation(emd.id); |
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367 | adder.visit((Relation)em.member); |
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368 | } |
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369 | } else { |
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370 | // this is an error. |
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371 | } |
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372 | en.members.add(em); |
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373 | } |
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374 | } |
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375 | } |
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376 | |
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377 | /** |
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378 | * Parse the given input source and return the dataset. |
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379 | * @param ref The dataset that is search in for references first. If |
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380 | * the Reference is not found here, Main.ds is searched and a copy of the |
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381 | * elemet found there is returned. |
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382 | */ |
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383 | public static DataSet parseDataSet(InputStream source, DataSet ref, PleaseWaitDialog pleaseWaitDlg) throws SAXException, IOException { |
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384 | OsmReader osm = new OsmReader(); |
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385 | osm.references = ref == null ? new DataSet() : ref; |
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386 | |
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387 | // phase 1: Parse nodes and read in raw ways |
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388 | InputSource inputSource = new InputSource(new InputStreamReader(source, "UTF-8")); |
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389 | try { |
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390 | SAXParserFactory.newInstance().newSAXParser().parse(inputSource, osm.new Parser()); |
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391 | } catch (ParserConfigurationException e1) { |
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392 | e1.printStackTrace(); // broken SAXException chaining |
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393 | throw new SAXException(e1); |
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394 | } |
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395 | if (pleaseWaitDlg != null) { |
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396 | pleaseWaitDlg.progress.setValue(0); |
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397 | pleaseWaitDlg.currentAction.setText(tr("Preparing data...")); |
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398 | } |
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399 | for (Node n : osm.nodes.values()) |
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400 | osm.adder.visit(n); |
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401 | |
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402 | try { |
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403 | osm.createWays(); |
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404 | osm.createRelations(); |
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405 | } catch (NumberFormatException e) { |
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406 | e.printStackTrace(); |
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407 | throw new SAXException(tr("Illformed Node id")); |
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408 | } |
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409 | |
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410 | // clear all negative ids (new to this file) |
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411 | for (OsmPrimitive o : osm.ds.allPrimitives()) |
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412 | if (o.id < 0) |
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413 | o.id = 0; |
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414 | |
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415 | return osm.ds; |
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416 | } |
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417 | } |
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