1 | // License: GPL. For details, see LICENSE file.
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2 | package org.openstreetmap.josm.io.imagery;
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3 |
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4 | import java.io.IOException;
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5 | import java.io.InputStream;
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6 | import java.util.ArrayList;
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7 | import java.util.Arrays;
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8 | import java.util.List;
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9 | import java.util.Objects;
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10 | import java.util.Stack;
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11 |
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12 | import javax.xml.parsers.ParserConfigurationException;
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13 | import javax.xml.parsers.SAXParserFactory;
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14 |
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15 | import org.openstreetmap.josm.Main;
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16 | import org.openstreetmap.josm.data.imagery.ImageryInfo;
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17 | import org.openstreetmap.josm.data.imagery.ImageryInfo.ImageryBounds;
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18 | import org.openstreetmap.josm.data.imagery.ImageryInfo.ImageryType;
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19 | import org.openstreetmap.josm.data.imagery.Shape;
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20 | import org.openstreetmap.josm.io.CachedFile;
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21 | import org.openstreetmap.josm.io.UTFInputStreamReader;
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22 | import org.xml.sax.Attributes;
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23 | import org.xml.sax.InputSource;
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24 | import org.xml.sax.SAXException;
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25 | import org.xml.sax.helpers.DefaultHandler;
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26 |
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27 | public class ImageryReader {
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28 |
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29 | private String source;
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30 |
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31 | private enum State {
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32 | INIT, // initial state, should always be at the bottom of the stack
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33 | IMAGERY, // inside the imagery element
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34 | ENTRY, // inside an entry
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35 | ENTRY_ATTRIBUTE, // note we are inside an entry attribute to collect the character data
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36 | PROJECTIONS,
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37 | CODE,
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38 | BOUNDS,
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39 | SHAPE,
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40 | UNKNOWN, // element is not recognized in the current context
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41 | }
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42 |
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43 | public ImageryReader(String source) {
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44 | this.source = source;
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45 | }
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46 |
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47 | public List<ImageryInfo> parse() throws SAXException, IOException {
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48 | Parser parser = new Parser();
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49 | try {
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50 | SAXParserFactory factory = SAXParserFactory.newInstance();
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51 | factory.setNamespaceAware(true);
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52 | try (InputStream in = new CachedFile(source)
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53 | .setMaxAge(1*CachedFile.DAYS)
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54 | .setCachingStrategy(CachedFile.CachingStrategy.IfModifiedSince)
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55 | .getInputStream()) {
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56 | InputSource is = new InputSource(UTFInputStreamReader.create(in));
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57 | factory.newSAXParser().parse(is, parser);
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58 | return parser.entries;
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59 | }
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60 | } catch (SAXException e) {
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61 | throw e;
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62 | } catch (ParserConfigurationException e) {
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63 | Main.error(e); // broken SAXException chaining
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64 | throw new SAXException(e);
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65 | }
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66 | }
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67 |
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68 | private static class Parser extends DefaultHandler {
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69 | private StringBuffer accumulator = new StringBuffer();
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70 |
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71 | private Stack<State> states;
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72 |
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73 | List<ImageryInfo> entries;
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74 |
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75 | /**
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76 | * Skip the current entry because it has mandatory attributes
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77 | * that this version of JOSM cannot process.
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78 | */
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79 | boolean skipEntry;
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80 |
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81 | ImageryInfo entry;
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82 | ImageryBounds bounds;
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83 | Shape shape;
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84 | List<String> projections;
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85 |
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86 | @Override public void startDocument() {
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87 | accumulator = new StringBuffer();
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88 | skipEntry = false;
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89 | states = new Stack<>();
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90 | states.push(State.INIT);
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91 | entries = new ArrayList<>();
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92 | entry = null;
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93 | bounds = null;
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94 | projections = null;
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95 | }
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96 |
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97 | @Override
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98 | public void startElement(String namespaceURI, String localName, String qName, Attributes atts) throws SAXException {
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99 | accumulator.setLength(0);
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100 | State newState = null;
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101 | switch (states.peek()) {
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102 | case INIT:
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103 | if ("imagery".equals(qName)) {
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104 | newState = State.IMAGERY;
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105 | }
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106 | break;
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107 | case IMAGERY:
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108 | if ("entry".equals(qName)) {
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109 | entry = new ImageryInfo();
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110 | skipEntry = false;
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111 | newState = State.ENTRY;
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112 | }
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113 | break;
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114 | case ENTRY:
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115 | if (Arrays.asList(new String[] {
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116 | "name",
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117 | "id",
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118 | "type",
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119 | "default",
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120 | "url",
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121 | "eula",
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122 | "min-zoom",
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123 | "max-zoom",
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124 | "attribution-text",
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125 | "attribution-url",
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126 | "logo-image",
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127 | "logo-url",
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128 | "terms-of-use-text",
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129 | "terms-of-use-url",
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130 | "country-code",
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131 | "icon",
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132 | }).contains(qName)) {
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133 | newState = State.ENTRY_ATTRIBUTE;
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134 | } else if ("bounds".equals(qName)) {
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135 | try {
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136 | bounds = new ImageryBounds(
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137 | atts.getValue("min-lat") + "," +
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138 | atts.getValue("min-lon") + "," +
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139 | atts.getValue("max-lat") + "," +
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140 | atts.getValue("max-lon"), ",");
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141 | } catch (IllegalArgumentException e) {
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142 | break;
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143 | }
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144 | newState = State.BOUNDS;
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145 | } else if ("projections".equals(qName)) {
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146 | projections = new ArrayList<>();
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147 | newState = State.PROJECTIONS;
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148 | }
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149 | break;
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150 | case BOUNDS:
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151 | if ("shape".equals(qName)) {
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152 | shape = new Shape();
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153 | newState = State.SHAPE;
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154 | }
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155 | break;
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156 | case SHAPE:
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157 | if ("point".equals(qName)) {
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158 | try {
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159 | shape.addPoint(atts.getValue("lat"), atts.getValue("lon"));
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160 | } catch (IllegalArgumentException e) {
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161 | break;
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162 | }
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163 | }
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164 | break;
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165 | case PROJECTIONS:
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166 | if ("code".equals(qName)) {
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167 | newState = State.CODE;
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168 | }
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169 | break;
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170 | }
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171 | /**
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172 | * Did not recognize the element, so the new state is UNKNOWN.
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173 | * This includes the case where we are already inside an unknown
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174 | * element, i.e. we do not try to understand the inner content
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175 | * of an unknown element, but wait till it's over.
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176 | */
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177 | if (newState == null) {
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178 | newState = State.UNKNOWN;
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179 | }
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180 | states.push(newState);
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181 | if (newState == State.UNKNOWN && "true".equals(atts.getValue("mandatory"))) {
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182 | skipEntry = true;
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183 | }
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184 | return;
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185 | }
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186 |
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187 | @Override
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188 | public void characters(char[] ch, int start, int length) {
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189 | accumulator.append(ch, start, length);
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190 | }
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191 |
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192 | @Override
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193 | public void endElement(String namespaceURI, String qName, String rqName) {
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194 | switch (states.pop()) {
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195 | case INIT:
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196 | throw new RuntimeException("parsing error: more closing than opening elements");
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197 | case ENTRY:
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198 | if ("entry".equals(qName)) {
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199 | if (!skipEntry) {
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200 | entries.add(entry);
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201 | }
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202 | entry = null;
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203 | }
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204 | break;
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205 | case ENTRY_ATTRIBUTE:
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206 | switch(qName) {
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207 | case "name":
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208 | entry.setTranslatedName(accumulator.toString());
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209 | break;
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210 | case "id":
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211 | entry.setId(accumulator.toString());
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212 | break;
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213 | case "type":
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214 | boolean found = false;
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215 | for (ImageryType type : ImageryType.values()) {
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216 | if (Objects.equals(accumulator.toString(), type.getTypeString())) {
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217 | entry.setImageryType(type);
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218 | found = true;
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219 | break;
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220 | }
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221 | }
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222 | if (!found) {
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223 | skipEntry = true;
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224 | }
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225 | break;
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226 | case "default":
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227 | switch (accumulator.toString()) {
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228 | case "true":
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229 | entry.setDefaultEntry(true);
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230 | break;
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231 | case "false":
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232 | entry.setDefaultEntry(false);
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233 | break;
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234 | default:
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235 | skipEntry = true;
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236 | }
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237 | break;
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238 | case "url":
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239 | entry.setUrl(accumulator.toString());
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240 | break;
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241 | case "eula":
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242 | entry.setEulaAcceptanceRequired(accumulator.toString());
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243 | break;
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244 | case "min-zoom":
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245 | case "max-zoom":
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246 | Integer val = null;
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247 | try {
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248 | val = Integer.parseInt(accumulator.toString());
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249 | } catch(NumberFormatException e) {
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250 | val = null;
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251 | }
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252 | if (val == null) {
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253 | skipEntry = true;
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254 | } else {
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255 | if ("min-zoom".equals(qName)) {
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256 | entry.setDefaultMinZoom(val);
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257 | } else {
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258 | entry.setDefaultMaxZoom(val);
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259 | }
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260 | }
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261 | break;
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262 | case "attribution-text":
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263 | entry.setAttributionText(accumulator.toString());
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264 | break;
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265 | case "attribution-url":
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266 | entry.setAttributionLinkURL(accumulator.toString());
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267 | break;
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268 | case "logo-image":
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269 | entry.setAttributionImage(accumulator.toString());
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270 | break;
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271 | case "logo-url":
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272 | entry.setAttributionImageURL(accumulator.toString());
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273 | break;
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274 | case "terms-of-use-text":
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275 | entry.setTermsOfUseText(accumulator.toString());
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276 | break;
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277 | case "terms-of-use-url":
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278 | entry.setTermsOfUseURL(accumulator.toString());
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279 | break;
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280 | case "country-code":
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281 | entry.setCountryCode(accumulator.toString());
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282 | break;
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283 | case "icon":
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284 | entry.setIcon(accumulator.toString());
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285 | break;
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286 | }
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287 | break;
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288 | case BOUNDS:
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289 | entry.setBounds(bounds);
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290 | bounds = null;
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291 | break;
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292 | case SHAPE:
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293 | bounds.addShape(shape);
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294 | shape = null;
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295 | break;
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296 | case CODE:
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297 | projections.add(accumulator.toString());
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298 | break;
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299 | case PROJECTIONS:
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300 | entry.setServerProjections(projections);
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301 | projections = null;
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302 | break;
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303 | }
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304 | }
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305 | }
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306 | }
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