1 | //License: GPL. Copyright 2007 by Immanuel Scholz and others
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2 |
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3 | //TODO: this is far from complete, but can emulate old RawGps behaviour
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4 | package org.openstreetmap.josm.io;
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5 |
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6 | import static org.openstreetmap.josm.tools.I18n.tr;
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7 |
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8 | import java.io.File;
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9 | import java.io.IOException;
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10 | import java.io.InputStream;
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11 | import java.io.InputStreamReader;
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12 | import java.util.ArrayList;
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13 | import java.util.Collection;
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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.Stack;
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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.data.coor.LatLon;
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22 | import org.openstreetmap.josm.data.gpx.GpxData;
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23 | import org.openstreetmap.josm.data.gpx.GpxLink;
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24 | import org.openstreetmap.josm.data.gpx.GpxRoute;
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25 | import org.openstreetmap.josm.data.gpx.GpxTrack;
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26 | import org.openstreetmap.josm.data.gpx.WayPoint;
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27 | import org.xml.sax.Attributes;
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28 | import org.xml.sax.InputSource;
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29 | import org.xml.sax.SAXException;
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30 | import org.xml.sax.helpers.DefaultHandler;
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31 |
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32 | /**
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33 | * Read a gpx file. Bounds are not read, as we caluclate them. @see GpxData.recalculateBounds()
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34 | * @author imi, ramack
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35 | */
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36 | public class GpxReader {
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37 | // TODO: implement GPX 1.0 parsing
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38 |
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39 | /**
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40 | * The resulting gpx data
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41 | */
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42 | public GpxData data;
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43 | public enum state { init, metadata, wpt, rte, trk, ext, author, link, trkseg }
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44 |
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45 | private class Parser extends DefaultHandler {
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46 |
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47 | private GpxData currentData;
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48 | private GpxTrack currentTrack;
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49 | private Collection<WayPoint> currentTrackSeg;
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50 | private GpxRoute currentRoute;
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51 | private WayPoint currentWayPoint;
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52 |
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53 | private state currentState = state.init;
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54 |
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55 | private GpxLink currentLink;
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56 | private Stack<state> states;
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57 |
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58 | private StringBuffer accumulator = new StringBuffer();
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59 |
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60 | @Override public void startDocument() {
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61 | accumulator = new StringBuffer();
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62 | states = new Stack<state>();
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63 | currentData = new GpxData();
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64 | }
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65 |
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66 | private double parseCoord(String s) {
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67 | try {
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68 | return Double.parseDouble(s);
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69 | } catch (NumberFormatException ex) {
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70 | return Double.NaN;
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71 | }
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72 | }
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73 |
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74 | private LatLon parseLatLon(Attributes atts) {
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75 | return new LatLon(
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76 | parseCoord(atts.getValue("lat")),
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77 | parseCoord(atts.getValue("lon")));
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78 | }
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79 |
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80 | @Override public void startElement(String namespaceURI, String localName, String qName, Attributes atts) throws SAXException {
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81 | switch(currentState) {
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82 | case init:
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83 | if (qName.equals("metadata")) {
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84 | states.push(currentState);
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85 | currentState = state.metadata;
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86 | } else if (qName.equals("wpt")) {
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87 | states.push(currentState);
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88 | currentState = state.wpt;
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89 | currentWayPoint = new WayPoint(parseLatLon(atts));
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90 | } else if (qName.equals("rte")) {
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91 | states.push(currentState);
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92 | currentState = state.rte;
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93 | currentRoute = new GpxRoute();
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94 | } else if (qName.equals("trk")) {
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95 | states.push(currentState);
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96 | currentState = state.trk;
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97 | currentTrack = new GpxTrack();
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98 | } else if (qName.equals("extensions")) {
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99 | states.push(currentState);
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100 | currentState = state.ext;
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101 | }
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102 | break;
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103 | case author:
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104 | if (qName.equals("link")) {
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105 | states.push(currentState);
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106 | currentState = state.link;
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107 | currentLink = new GpxLink(atts.getValue("href"));
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108 | }
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109 | break;
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110 | case trk:
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111 | if (qName.equals("trkseg")) {
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112 | states.push(currentState);
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113 | currentState = state.trkseg;
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114 | currentTrackSeg = new ArrayList<WayPoint>();
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115 | } else if (qName.equals("link")) {
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116 | states.push(currentState);
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117 | currentState = state.link;
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118 | currentLink = new GpxLink(atts.getValue("href"));
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119 | } else if (qName.equals("extensions")) {
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120 | states.push(currentState);
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121 | currentState = state.ext;
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122 | }
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123 | break;
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124 | case metadata:
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125 | if (qName.equals("author")) {
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126 | states.push(currentState);
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127 | currentState = state.author;
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128 | } else if (qName.equals("extensions")) {
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129 | states.push(currentState);
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130 | currentState = state.ext;
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131 | }
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132 | break;
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133 | case trkseg:
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134 | if (qName.equals("trkpt")) {
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135 | states.push(currentState);
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136 | currentState = state.wpt;
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137 | currentWayPoint = new WayPoint(parseLatLon(atts));
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138 | }
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139 | break;
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140 | case wpt:
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141 | if (qName.equals("link")) {
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142 | states.push(currentState);
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143 | currentState = state.link;
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144 | currentLink = new GpxLink(atts.getValue("href"));
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145 | } else if (qName.equals("extensions")) {
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146 | states.push(currentState);
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147 | currentState = state.ext;
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148 | }
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149 | break;
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150 | case rte:
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151 | if (qName.equals("link")) {
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152 | states.push(currentState);
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153 | currentState = state.link;
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154 | currentLink = new GpxLink(atts.getValue("href"));
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155 | } else if (qName.equals("rtept")) {
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156 | states.push(currentState);
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157 | currentState = state.wpt;
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158 | currentWayPoint = new WayPoint(parseLatLon(atts));
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159 | } else if (qName.equals("extensions")) {
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160 | states.push(currentState);
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161 | currentState = state.ext;
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162 | }
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163 | break;
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164 | default:
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165 | }
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166 | accumulator.setLength(0);
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167 | }
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168 |
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169 | @Override public void characters(char[] ch, int start, int length) {
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170 | accumulator.append(ch, start, length);
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171 | }
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172 |
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173 | private Map<String, Object> getAttr() {
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174 | switch (currentState) {
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175 | case rte: return currentRoute.attr;
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176 | case metadata: return currentData.attr;
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177 | case wpt: return currentWayPoint.attr;
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178 | case trk: return currentTrack.attr;
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179 | default: return null;
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180 | }
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181 | }
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182 |
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183 | @Override public void endElement(String namespaceURI, String localName, String qName) {
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184 | switch (currentState) {
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185 | case metadata:
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186 | if (qName.equals("name") || qName.equals("desc") ||
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187 | qName.equals("time") || qName.equals("keywords")) {
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188 | currentData.attr.put(qName, accumulator.toString());
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189 | } else if (qName.equals("metadata")) {
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190 | currentState = states.pop();
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191 | }
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192 | //TODO: parse copyright, bounds, extensions
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193 | break;
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194 | case author:
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195 | if (qName.equals("author")) {
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196 | currentState = states.pop();
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197 | } else if (qName.equals("name") || qName.equals("email")) {
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198 | currentData.attr.put("author" + qName, accumulator.toString());
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199 | } else if (qName.equals("link")) {
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200 | currentData.attr.put("authorlink", currentLink);
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201 | }
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202 | break;
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203 | case link:
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204 | if (qName.equals("text")) {
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205 | currentLink.text = accumulator.toString();
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206 | } else if (qName.equals("type")) {
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207 | currentLink.type = accumulator.toString();
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208 | } else if (qName.equals("link")) {
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209 | // <link>URL</link>
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210 | if (currentLink.uri == null)
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211 | currentLink.uri = accumulator.toString();
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212 |
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213 | currentState = states.pop();
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214 | }
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215 | if (currentState == state.author) {
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216 | currentData.attr.put("authorlink", currentLink);
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217 | } else if (currentState != state.link) {
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218 | Map<String, Object> attr = getAttr();
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219 | if (!attr.containsKey("link")) {
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220 | attr.put("link", new LinkedList<GpxLink>());
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221 | }
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222 | ((Collection<GpxLink>) attr.get("link")).add(currentLink);
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223 | }
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224 | break;
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225 | case wpt:
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226 | if (qName.equals("ele") || qName.equals("desc")
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227 | || qName.equals("magvar") || qName.equals("geoidheight")
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228 | || qName.equals("name") || qName.equals("sym")
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229 | || qName.equals("cmt") || qName.equals("type")) {
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230 | currentWayPoint.attr.put(qName, accumulator.toString());
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231 | } else if (qName.equals("time")) {
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232 | currentWayPoint.attr.put(qName, accumulator.toString());
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233 | currentWayPoint.setTime();
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234 | } else if (qName.equals("rtept")) {
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235 | currentState = states.pop();
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236 | currentRoute.routePoints.add(currentWayPoint);
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237 | } else if (qName.equals("trkpt")) {
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238 | currentState = states.pop();
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239 | currentTrackSeg.add(currentWayPoint);
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240 | } else if (qName.equals("wpt")) {
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241 | currentState = states.pop();
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242 | currentData.waypoints.add(currentWayPoint);
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243 | }
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244 | break;
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245 | case trkseg:
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246 | if (qName.equals("trkseg")) {
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247 | currentState = states.pop();
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248 | currentTrack.trackSegs.add(currentTrackSeg);
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249 | }
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250 | break;
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251 | case trk:
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252 | if (qName.equals("trk")) {
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253 | currentState = states.pop();
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254 | currentData.tracks.add(currentTrack);
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255 | } else if (qName.equals("name") || qName.equals("cmt")
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256 | || qName.equals("desc") || qName.equals("src")
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257 | || qName.equals("type") || qName.equals("number")) {
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258 | currentTrack.attr.put(qName, accumulator.toString());
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259 | }
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260 | break;
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261 | case ext:
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262 | if (qName.equals("extensions")) {
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263 | currentState = states.pop();
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264 | }
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265 | break;
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266 | default:
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267 | if (qName.equals("wpt")) {
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268 | currentState = states.pop();
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269 | } else if (qName.equals("rte")) {
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270 | currentState = states.pop();
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271 | currentData.routes.add(currentRoute);
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272 | }
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273 | }
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274 | }
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275 |
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276 | @Override public void endDocument() throws SAXException {
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277 | if (!states.empty()) {
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278 | throw new SAXException(tr("Parse error: invalid document structure for gpx document"));
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279 | }
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280 | data = currentData;
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281 | }
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282 | }
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283 |
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284 | /**
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285 | * Parse the input stream and store the result in trackData and markerData
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286 | *
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287 | * @param relativeMarkerPath The directory to use as relative path for all <wpt>
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288 | * marker tags. Maybe <code>null</code>, in which case no relative urls are constructed for the markers.
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289 | */
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290 | public GpxReader(InputStream source, File relativeMarkerPath) throws SAXException, IOException {
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291 |
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292 | Parser parser = new Parser();
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293 | InputSource inputSource = new InputSource(new InputStreamReader(source, "UTF-8"));
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294 | try {
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295 | SAXParserFactory.newInstance().newSAXParser().parse(inputSource, parser);
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296 | data.storageFile = relativeMarkerPath;
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297 | } catch (ParserConfigurationException e) {
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298 | e.printStackTrace(); // broken SAXException chaining
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299 | throw new SAXException(e);
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300 | }
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301 | }
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302 | }
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