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.HashMap;
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9 | import java.util.List;
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10 | import java.util.Map;
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11 | import java.util.Objects;
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12 | import java.util.Stack;
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13 |
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14 | import javax.xml.parsers.ParserConfigurationException;
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15 |
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16 | import org.openstreetmap.josm.Main;
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17 | import org.openstreetmap.josm.data.imagery.ImageryInfo;
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18 | import org.openstreetmap.josm.data.imagery.ImageryInfo.ImageryBounds;
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19 | import org.openstreetmap.josm.data.imagery.ImageryInfo.ImageryType;
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20 | import org.openstreetmap.josm.data.imagery.Shape;
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21 | import org.openstreetmap.josm.io.CachedFile;
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22 | import org.openstreetmap.josm.io.UTFInputStreamReader;
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23 | import org.openstreetmap.josm.tools.LanguageInfo;
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24 | import org.openstreetmap.josm.tools.Utils;
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25 | import org.xml.sax.Attributes;
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26 | import org.xml.sax.InputSource;
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27 | import org.xml.sax.SAXException;
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28 | import org.xml.sax.helpers.DefaultHandler;
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29 |
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30 | public class ImageryReader {
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31 |
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32 | private String source;
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33 |
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34 | private enum State {
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35 | INIT, // initial state, should always be at the bottom of the stack
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36 | IMAGERY, // inside the imagery element
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37 | ENTRY, // inside an entry
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38 | ENTRY_ATTRIBUTE, // note we are inside an entry attribute to collect the character data
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39 | PROJECTIONS,
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40 | CODE,
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41 | BOUNDS,
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42 | SHAPE,
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43 | NO_TILE,
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44 | METADATA,
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45 | UNKNOWN, // element is not recognized in the current context
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46 | }
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47 |
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48 | public ImageryReader(String source) {
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49 | this.source = source;
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50 | }
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51 |
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52 | public List<ImageryInfo> parse() throws SAXException, IOException {
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53 | Parser parser = new Parser();
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54 | try {
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55 | try (InputStream in = new CachedFile(source)
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56 | .setMaxAge(1*CachedFile.DAYS)
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57 | .setCachingStrategy(CachedFile.CachingStrategy.IfModifiedSince)
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58 | .getInputStream()) {
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59 | InputSource is = new InputSource(UTFInputStreamReader.create(in));
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60 | Utils.parseSafeSAX(is, parser);
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61 | return parser.entries;
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62 | }
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63 | } catch (SAXException e) {
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64 | throw e;
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65 | } catch (ParserConfigurationException e) {
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66 | Main.error(e); // broken SAXException chaining
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67 | throw new SAXException(e);
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68 | }
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69 | }
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70 |
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71 | private static class Parser extends DefaultHandler {
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72 | private StringBuilder accumulator = new StringBuilder();
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73 |
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74 | private Stack<State> states;
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75 |
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76 | private List<ImageryInfo> entries;
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77 |
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78 | /**
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79 | * Skip the current entry because it has mandatory attributes
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80 | * that this version of JOSM cannot process.
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81 | */
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82 | private boolean skipEntry;
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83 |
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84 | private ImageryInfo entry;
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85 | private ImageryBounds bounds;
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86 | private Shape shape;
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87 | // language of last element, does only work for simple ENTRY_ATTRIBUTE's
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88 | private String lang;
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89 | private List<String> projections;
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90 | private Map<String, String> noTileHeaders;
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91 | private Map<String, String> metadataHeaders;
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92 |
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93 | @Override
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94 | public void startDocument() {
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95 | accumulator = new StringBuilder();
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96 | skipEntry = false;
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97 | states = new Stack<>();
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98 | states.push(State.INIT);
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99 | entries = new ArrayList<>();
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100 | entry = null;
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101 | bounds = null;
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102 | projections = null;
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103 | noTileHeaders = null;
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104 | }
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105 |
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106 | @Override
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107 | public void startElement(String namespaceURI, String localName, String qName, Attributes atts) throws SAXException {
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108 | accumulator.setLength(0);
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109 | State newState = null;
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110 | switch (states.peek()) {
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111 | case INIT:
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112 | if ("imagery".equals(qName)) {
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113 | newState = State.IMAGERY;
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114 | }
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115 | break;
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116 | case IMAGERY:
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117 | if ("entry".equals(qName)) {
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118 | entry = new ImageryInfo();
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119 | skipEntry = false;
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120 | newState = State.ENTRY;
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121 | noTileHeaders = new HashMap<>();
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122 | metadataHeaders = new HashMap<>();
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123 | }
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124 | break;
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125 | case ENTRY:
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126 | if (Arrays.asList(new String[] {
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127 | "name",
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128 | "id",
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129 | "type",
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130 | "description",
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131 | "default",
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132 | "url",
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133 | "eula",
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134 | "min-zoom",
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135 | "max-zoom",
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136 | "attribution-text",
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137 | "attribution-url",
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138 | "logo-image",
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139 | "logo-url",
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140 | "terms-of-use-text",
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141 | "terms-of-use-url",
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142 | "country-code",
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143 | "icon",
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144 | "tile-size",
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145 | }).contains(qName)) {
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146 | newState = State.ENTRY_ATTRIBUTE;
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147 | lang = atts.getValue("lang");
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148 | } else if ("bounds".equals(qName)) {
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149 | try {
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150 | bounds = new ImageryBounds(
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151 | atts.getValue("min-lat") + ',' +
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152 | atts.getValue("min-lon") + ',' +
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153 | atts.getValue("max-lat") + ',' +
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154 | atts.getValue("max-lon"), ",");
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155 | } catch (IllegalArgumentException e) {
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156 | break;
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157 | }
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158 | newState = State.BOUNDS;
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159 | } else if ("projections".equals(qName)) {
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160 | projections = new ArrayList<>();
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161 | newState = State.PROJECTIONS;
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162 | } else if ("no-tile-header".equals(qName)) {
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163 | noTileHeaders.put(atts.getValue("name"), atts.getValue("value"));
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164 | newState = State.NO_TILE;
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165 | } else if ("metadata-header".equals(qName)) {
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166 | metadataHeaders.put(atts.getValue("header-name"), atts.getValue("metadata-key"));
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167 | newState = State.METADATA;
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168 | }
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169 | break;
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170 | case BOUNDS:
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171 | if ("shape".equals(qName)) {
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172 | shape = new Shape();
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173 | newState = State.SHAPE;
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174 | }
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175 | break;
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176 | case SHAPE:
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177 | if ("point".equals(qName)) {
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178 | try {
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179 | shape.addPoint(atts.getValue("lat"), atts.getValue("lon"));
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180 | } catch (IllegalArgumentException e) {
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181 | break;
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182 | }
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183 | }
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184 | break;
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185 | case PROJECTIONS:
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186 | if ("code".equals(qName)) {
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187 | newState = State.CODE;
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188 | }
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189 | break;
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190 | }
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191 | /**
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192 | * Did not recognize the element, so the new state is UNKNOWN.
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193 | * This includes the case where we are already inside an unknown
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194 | * element, i.e. we do not try to understand the inner content
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195 | * of an unknown element, but wait till it's over.
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196 | */
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197 | if (newState == null) {
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198 | newState = State.UNKNOWN;
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199 | }
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200 | states.push(newState);
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201 | if (newState == State.UNKNOWN && "true".equals(atts.getValue("mandatory"))) {
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202 | skipEntry = true;
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203 | }
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204 | }
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205 |
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206 | @Override
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207 | public void characters(char[] ch, int start, int length) {
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208 | accumulator.append(ch, start, length);
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209 | }
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210 |
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211 | @Override
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212 | public void endElement(String namespaceURI, String qName, String rqName) {
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213 | switch (states.pop()) {
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214 | case INIT:
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215 | throw new RuntimeException("parsing error: more closing than opening elements");
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216 | case ENTRY:
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217 | if ("entry".equals(qName)) {
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218 | entry.setNoTileHeaders(noTileHeaders);
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219 | noTileHeaders = null;
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220 | entry.setMetadataHeaders(metadataHeaders);
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221 | metadataHeaders = null;
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222 |
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223 | if (!skipEntry) {
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224 | entries.add(entry);
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225 | }
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226 | entry = null;
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227 | }
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228 | break;
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229 | case ENTRY_ATTRIBUTE:
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230 | switch(qName) {
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231 | case "name":
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232 | entry.setName(lang == null ? LanguageInfo.getJOSMLocaleCode(null) : lang, accumulator.toString());
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233 | break;
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234 | case "description":
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235 | entry.setDescription(lang, accumulator.toString());
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236 | break;
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237 | case "id":
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238 | entry.setId(accumulator.toString());
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239 | break;
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240 | case "type":
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241 | boolean found = false;
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242 | for (ImageryType type : ImageryType.values()) {
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243 | if (Objects.equals(accumulator.toString(), type.getTypeString())) {
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244 | entry.setImageryType(type);
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245 | found = true;
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246 | break;
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247 | }
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248 | }
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249 | if (!found) {
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250 | skipEntry = true;
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251 | }
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252 | break;
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253 | case "default":
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254 | switch (accumulator.toString()) {
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255 | case "true":
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256 | entry.setDefaultEntry(true);
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257 | break;
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258 | case "false":
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259 | entry.setDefaultEntry(false);
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260 | break;
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261 | default:
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262 | skipEntry = true;
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263 | }
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264 | break;
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265 | case "url":
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266 | entry.setUrl(accumulator.toString());
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267 | break;
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268 | case "eula":
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269 | entry.setEulaAcceptanceRequired(accumulator.toString());
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270 | break;
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271 | case "min-zoom":
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272 | case "max-zoom":
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273 | Integer val = null;
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274 | try {
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275 | val = Integer.valueOf(accumulator.toString());
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276 | } catch (NumberFormatException e) {
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277 | val = null;
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278 | }
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279 | if (val == null) {
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280 | skipEntry = true;
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281 | } else {
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282 | if ("min-zoom".equals(qName)) {
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283 | entry.setDefaultMinZoom(val);
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284 | } else {
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285 | entry.setDefaultMaxZoom(val);
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286 | }
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287 | }
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288 | break;
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289 | case "attribution-text":
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290 | entry.setAttributionText(accumulator.toString());
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291 | break;
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292 | case "attribution-url":
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293 | entry.setAttributionLinkURL(accumulator.toString());
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294 | break;
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295 | case "logo-image":
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296 | entry.setAttributionImage(accumulator.toString());
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297 | break;
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298 | case "logo-url":
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299 | entry.setAttributionImageURL(accumulator.toString());
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300 | break;
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301 | case "terms-of-use-text":
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302 | entry.setTermsOfUseText(accumulator.toString());
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303 | break;
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304 | case "terms-of-use-url":
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305 | entry.setTermsOfUseURL(accumulator.toString());
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306 | break;
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307 | case "country-code":
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308 | entry.setCountryCode(accumulator.toString());
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309 | break;
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310 | case "icon":
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311 | entry.setIcon(accumulator.toString());
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312 | break;
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313 | case "tile-size":
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314 | Integer tileSize = null;
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315 | try {
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316 | tileSize = Integer.valueOf(accumulator.toString());
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317 | } catch (NumberFormatException e) {
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318 | tileSize = null;
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319 | }
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320 | if (tileSize == null) {
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321 | skipEntry = true;
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322 | } else {
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323 | entry.setTileSize(tileSize.intValue());
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324 | }
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325 | break;
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326 | }
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327 | break;
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328 | case BOUNDS:
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329 | entry.setBounds(bounds);
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330 | bounds = null;
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331 | break;
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332 | case SHAPE:
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333 | bounds.addShape(shape);
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334 | shape = null;
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335 | break;
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336 | case CODE:
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337 | projections.add(accumulator.toString());
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338 | break;
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339 | case PROJECTIONS:
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340 | entry.setServerProjections(projections);
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341 | projections = null;
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342 | break;
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343 | case NO_TILE:
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344 | break;
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345 |
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346 | }
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347 | }
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348 | }
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349 | }
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