1 | // License: GPL. For details, see LICENSE file.
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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.net.HttpURLConnection;
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9 | import java.util.Collection;
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10 | import java.util.HashSet;
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11 | import java.util.Iterator;
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12 | import java.util.NoSuchElementException;
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13 | import java.util.Set;
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14 | import java.util.logging.Logger;
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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.osm.DataSet;
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18 | import org.openstreetmap.josm.data.osm.Node;
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19 | import org.openstreetmap.josm.data.osm.OsmPrimitive;
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20 | import org.openstreetmap.josm.data.osm.OsmPrimitiveType;
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21 | import org.openstreetmap.josm.data.osm.Relation;
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22 | import org.openstreetmap.josm.data.osm.RelationMember;
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23 | import org.openstreetmap.josm.data.osm.Way;
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24 | import org.openstreetmap.josm.data.osm.visitor.MergeVisitor;
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25 | import org.xml.sax.SAXException;
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26 |
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27 | /**
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28 | * Retrieves a set of {@see OsmPrimitive}s from an OSM server using the so called
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29 | * Multi Fetch API.
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30 | *
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31 | * Usage:
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32 | * <pre>
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33 | * MultiFetchServerObjectReader reader = MultiFetchServerObjectReader()
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34 | * .append(2345,2334,4444)
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35 | * .append(new Node(72343));
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36 | * reader.parseOsm();
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37 | * if (!reader.getMissingPrimitives().isEmpty()) {
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38 | * System.out.println("There are missing primitives: " + reader.getMissingPrimitives());
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39 | * }
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40 | * if (!reader.getSkippedWays().isEmpty()) {
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41 | * System.out.println("There are skipped ways: " + reader.getMissingPrimitives());
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42 | * }
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43 | * </pre>
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44 | *
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45 | *
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46 | */
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47 | public class MultiFetchServerObjectReader extends OsmServerReader{
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48 |
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49 | static private Logger logger = Logger.getLogger(MultiFetchServerObjectReader.class.getName());
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50 | /**
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51 | * the max. number of primitives retrieved in one step. Assuming IDs with 7 digits,
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52 | * this leads to a max. request URL of ~ 1600 Bytes ((7 digits + 1 Seperator) * 200),
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53 | * which should be safe according to the
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54 | * <a href="http://www.boutell.com/newfaq/misc/urllength.html">WWW FAQ</a>.
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55 | *
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56 | */
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57 | static private int MAX_IDS_PER_REQUEST = 200;
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58 |
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59 |
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60 | private HashSet<Long> nodes;
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61 | private HashSet<Long> ways;
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62 | private HashSet<Long> relations;
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63 | private HashSet<Long> missingPrimitives;
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64 | private HashSet<Long> skippedWayIds;
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65 | private DataSet outputDataSet;
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66 |
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67 | /**
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68 | * constructor
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69 | *
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70 | */
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71 | public MultiFetchServerObjectReader() {
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72 | nodes = new HashSet<Long>();
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73 | ways = new HashSet<Long>();
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74 | relations = new HashSet<Long>();
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75 | this.outputDataSet = new DataSet();
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76 | this.missingPrimitives = new HashSet<Long>();
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77 | }
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78 |
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79 | /**
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80 | * remembers an {@see OsmPrimitive}'s id and its type. The id will
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81 | * later be fetched as part of a Multi Get request.
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82 | *
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83 | * Ignore the id if it id <= 0.
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84 | *
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85 | * @param id the id
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86 | * @param type the type
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87 | */
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88 | protected void remember(long id, OsmPrimitiveType type) {
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89 | if (id <= 0) return;
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90 | if (type.equals(OsmPrimitiveType.NODE)) {
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91 | nodes.add(id);
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92 | } else if (type.equals(OsmPrimitiveType.WAY)) {
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93 | ways.add(id);
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94 | } if (type.equals(OsmPrimitiveType.RELATION)) {
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95 | relations.add(id);
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96 | }
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97 | }
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98 |
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99 | /**
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100 | * remembers an {@see OsmPrimitive}'s id. <code>ds</code> must include
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101 | * an {@see OsmPrimitive} with id=<code>id</code>. The id will
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102 | * later we fetched as part of a Multi Get request.
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103 | *
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104 | * Ignore the id if it id <= 0.
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105 | *
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106 | * @param ds the dataset (must not be null)
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107 | * @param id the id
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108 | * @exception IllegalArgumentException thrown, if ds is null
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109 | * @exception NoSuchElementException thrown, if ds doesn't include an {@see OsmPrimitive} with
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110 | * id=<code>id</code>
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111 | */
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112 | protected void remember(DataSet ds, long id) throws IllegalArgumentException, NoSuchElementException{
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113 | if (ds == null)
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114 | throw new IllegalArgumentException(tr("parameter ''{0}'' must not be null", "ds"));
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115 | if (id <= 0) return;
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116 | OsmPrimitive primitive = ds.getPrimitiveById(id);
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117 | if (primitive == null)
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118 | throw new NoSuchElementException(tr("no primitive with id {0} in local dataset. Can't infer primitive type", id));
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119 | remember(id, OsmPrimitiveType.from(primitive));
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120 | return;
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121 | }
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122 |
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123 | /**
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124 | * appends a list of ids to the list of ids which will be fetched from the server. ds must
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125 | * include an {@see OsmPrimitive} for each id in ids.
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126 | *
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127 | * id is ignored if id <= 0.
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128 | *
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129 | * @param ds the dataset
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130 | * @param ids the list of ids
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131 | * @return this
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132 | *
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133 | */
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134 | public MultiFetchServerObjectReader append(DataSet ds, long ... ids) {
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135 | if (ids == null) return this;
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136 | for (int i=0; i < ids.length; i++) {
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137 | remember(ds, ids[i]);
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138 | }
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139 | return this;
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140 | }
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141 |
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142 | /**
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143 | * appends a collection of ids to the list of ids which will be fetched from the server. ds must
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144 | * include an {@see OsmPrimitive} for each id in ids.
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145 | *
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146 | * id is ignored if id <= 0.
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147 | *
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148 | * @param ds the dataset
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149 | * @param ids the collection of ids
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150 | * @return this
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151 | *
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152 | */
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153 | public MultiFetchServerObjectReader append(DataSet ds, Collection<Long> ids) {
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154 | if (ids == null) return null;
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155 | for (long id: ids) {
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156 | append(ds,id);
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157 | }
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158 | return this;
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159 | }
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160 |
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161 | /**
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162 | * appends a {@see Node}s id to the list of ids which will be fetched from the server.
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163 | *
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164 | * @param node the node (ignored, if null)
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165 | * @return this
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166 | *
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167 | */
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168 | public MultiFetchServerObjectReader append(Node node) {
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169 | if (node == null) return this;
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170 | if (node.id == 0) return this;
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171 | remember(node.id, OsmPrimitiveType.NODE);
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172 | return this;
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173 | }
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174 |
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175 | /**
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176 | * appends a {@see Way}s id and the list of ids of nodes the way refers to to the list of ids which will be fetched from the server.
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177 | *
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178 | * @param way the way (ignored, if null)
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179 | * @return this
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180 | *
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181 | */
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182 | public MultiFetchServerObjectReader append(Way way) {
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183 | if (way == null) return this;
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184 | if (way.id == 0) return this;
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185 | for (Node node: way.nodes) {
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186 | if (node.id > 0) {
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187 | remember(node.id, OsmPrimitiveType.NODE);
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188 | }
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189 | }
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190 | remember(way.id, OsmPrimitiveType.WAY);
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191 | return this;
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192 | }
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193 |
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194 | /**
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195 | * appends a {@see Relation}s id to the list of ids which will be fetched from the server.
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196 | *
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197 | * @param relation the relation (ignored, if null)
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198 | * @return this
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199 | *
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200 | */
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201 | public MultiFetchServerObjectReader append(Relation relation) {
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202 | if (relation == null) return this;
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203 | if (relation.id == 0) return this;
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204 | remember(relation.id, OsmPrimitiveType.RELATION);
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205 | for (RelationMember member : relation.members) {
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206 | appendGeneric(member.member);
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207 | }
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208 | return this;
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209 | }
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210 |
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211 |
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212 | protected MultiFetchServerObjectReader appendGeneric(OsmPrimitive primitive) {
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213 | if (OsmPrimitiveType.from(primitive).equals(OsmPrimitiveType.NODE))
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214 | return append((Node)primitive);
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215 | else if (OsmPrimitiveType.from(primitive).equals(OsmPrimitiveType.WAY))
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216 | return append((Way)primitive);
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217 | else if (OsmPrimitiveType.from(primitive).equals(OsmPrimitiveType.RELATION))
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218 | return append((Relation)primitive);
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219 |
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220 | return this;
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221 | }
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222 |
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223 | /**
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224 | * appends a list of {@see OsmPrimitive} to the list of ids which will be fetched from the server.
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225 | *
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226 | * @param primitives the list of primitives (ignored, if null)
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227 | * @return this
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228 | *
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229 | * @see #append(Node)
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230 | * @see #append(Way)
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231 | * @see #append(Relation)
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232 | *
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233 | */
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234 | public MultiFetchServerObjectReader append(Collection<OsmPrimitive> primitives) {
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235 | if (primitives == null) return this;
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236 | for (OsmPrimitive primitive : primitives) {
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237 | appendGeneric(primitive);
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238 | }
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239 | return this;
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240 | }
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241 |
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242 | /**
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243 | * extracts a subset of max {@see #MAX_IDS_PER_REQUEST} ids from <code>ids</code> and
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244 | * replies the subset. The extracted subset is removed from <code>ids</code>.
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245 | *
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246 | * @param ids a set of ids
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247 | * @return the subset of ids
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248 | */
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249 | protected Set<Long> extractIdPackage(Set<Long> ids) {
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250 | HashSet<Long> pkg = new HashSet<Long>();
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251 | if (ids.isEmpty())
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252 | return pkg;
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253 | if (ids.size() > MAX_IDS_PER_REQUEST) {
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254 | Iterator<Long> it = ids.iterator();
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255 | for (int i =0;i<MAX_IDS_PER_REQUEST;i++) {
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256 | pkg.add(it.next());
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257 | }
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258 | ids.removeAll(pkg);
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259 | } else {
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260 | pkg.addAll(ids);
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261 | ids.clear();
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262 | }
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263 | return pkg;
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264 | }
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265 |
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266 |
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267 | /**
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268 | * builds the Multi Get request string for a set of ids and a given
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269 | * {@see OsmPrimitiveType}.
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270 | *
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271 | * @param type the type
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272 | * @param idPackage the package of ids
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273 | * @return the request string
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274 | */
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275 | protected String buildRequestString(OsmPrimitiveType type, Set<Long> idPackage) {
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276 | StringBuilder sb = new StringBuilder();
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277 | sb.append(type.getAPIName()).append("s?")
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278 | .append(type.getAPIName()).append("s=");
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279 |
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280 | Iterator<Long> it = idPackage.iterator();
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281 | for (int i=0; i< idPackage.size();i++) {
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282 | sb.append(it.next());
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283 | if (i < idPackage.size()-1) {
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284 | sb.append(",");
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285 | }
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286 | }
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287 | return sb.toString();
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288 | }
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289 |
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290 | /**
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291 | * builds the Multi Get request string for a single id and a given
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292 | * {@see OsmPrimitiveType}.
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293 | *
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294 | * @param type the type
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295 | * @param id the id
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296 | * @return the request string
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297 | */
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298 | protected String buildRequestString(OsmPrimitiveType type, long id) {
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299 | StringBuilder sb = new StringBuilder();
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300 | sb.append(type.getAPIName()).append("s?")
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301 | .append(type.getAPIName()).append("s=")
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302 | .append(id);
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303 | return sb.toString();
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304 | }
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305 |
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306 | /**
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307 | * invokes a Multi Get for a set of ids and a given {@see OsmPrimitiveType}.
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308 | * The retrieved primitives are merged to {@see #outputDataSet}.
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309 | *
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310 | * @param type the type
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311 | * @param pkg the package of ids
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312 | * @exception OsmTransferException thrown if an error occurs while communicating with the API server
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313 | *
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314 | */
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315 | protected void multiGetIdPackage(OsmPrimitiveType type, Set<Long> pkg) throws OsmTransferException {
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316 | String request = buildRequestString(type, pkg);
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317 | final InputStream in = getInputStream(request, Main.pleaseWaitDlg);
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318 | if (in == null) return;
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319 | Main.pleaseWaitDlg.currentAction.setText(tr("Downloading OSM data..."));
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320 | try {
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321 | final OsmReader osm = OsmReader.parseDataSetOsm(in, outputDataSet, Main.pleaseWaitDlg);
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322 | skippedWayIds.addAll(osm.getSkippedWayIds());
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323 | merge(osm.getDs());
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324 | } catch(IOException e) {
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325 | throw new OsmTransferException(e);
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326 | } catch(SAXException e) {
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327 | throw new OsmTransferException(e);
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328 | }
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329 | }
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330 |
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331 | /**
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332 | * invokes a Multi Get for a single id and a given {@see OsmPrimitiveType}.
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333 | * The retrieved primitive is merged to {@see #outputDataSet}.
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334 | *
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335 | * @param type the type
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336 | * @param id the id
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337 | * @exception OsmTransferException thrown if an error occurs while communicating with the API server
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338 | *
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339 | */
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340 | protected void singleGetId(OsmPrimitiveType type, long id) throws OsmTransferException {
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341 | String request = buildRequestString(type, id);
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342 | final InputStream in = getInputStream(request, Main.pleaseWaitDlg);
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343 | if (in == null)
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344 | return;
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345 | Main.pleaseWaitDlg.currentAction.setText(tr("Downloading OSM data..."));
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346 | try {
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347 | final OsmReader osm = OsmReader.parseDataSetOsm(in, null, Main.pleaseWaitDlg);
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348 | skippedWayIds.addAll(osm.getSkippedWayIds());
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349 | merge(osm.getDs());
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350 | } catch(IOException e) {
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351 | throw new OsmTransferException(e);
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352 | } catch(SAXException e) {
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353 | throw new OsmTransferException(e);
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354 | }
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355 | }
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356 |
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357 | /**
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358 | * invokes a sequence of Multi Gets for individual ids in a set of ids and a given {@see OsmPrimitiveType}.
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359 | * The retrieved primitives are merged to {@see #outputDataSet}.
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360 | *
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361 | * This method is used if one of the ids in pkg doesn't exist (the server replies with return code 404).
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362 | * If the set is fetched with this method it is possible to find out which of the ids doesn't exist.
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363 | * Unfortunatelly, the server does not provide an error header or an error body for a 404 reply.
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364 | *
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365 | * @param type the type
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366 | * @param pkg the set of ids
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367 | * @exception OsmTransferException thrown if an error occurs while communicating with the API server
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368 | *
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369 | */
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370 | protected void singleGetIdPackage(OsmPrimitiveType type, Set<Long> pkg) throws OsmTransferException {
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371 | for (long id : pkg) {
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372 | try {
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373 | singleGetId(type, id);
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374 | } catch(OsmApiException e) {
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375 | if (e.getResponseCode() == HttpURLConnection.HTTP_NOT_FOUND) {
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376 | logger.warning(tr("Server replied with response code 404 for id {0}. Skipping.", Long.toString(id)));
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377 | missingPrimitives.add(id);
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378 | continue;
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379 | }
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380 | throw e;
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381 | }
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382 | }
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383 | }
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384 |
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385 | /**
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386 | * merges the dataset <code>from</code> to {@see #outputDataSet}.
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387 | *
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388 | * @param from the other dataset
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389 | *
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390 | */
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391 | protected void merge(DataSet from) {
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392 | final MergeVisitor visitor = new MergeVisitor(outputDataSet,from);
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393 | visitor.merge();
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394 | }
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395 |
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396 | /**
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397 | * fetches a set of ids of a given {@see OsmPrimitiveType} from the server
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398 | *
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399 | * @param ids the set of ids
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400 | * @param type the type
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401 | * @exception OsmTransferException thrown if an error occurs while communicating with the API server
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402 | */
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403 | protected void fetchPrimitives(Set<Long> ids, OsmPrimitiveType type) throws OsmTransferException{
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404 | Set<Long> toFetch = new HashSet<Long>(ids);
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405 | toFetch.addAll(ids);
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406 | while(! toFetch.isEmpty()) {
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407 | Set<Long> pkg = extractIdPackage(toFetch);
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408 | try {
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409 | multiGetIdPackage(type, pkg);
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410 | } catch(OsmApiException e) {
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411 | if (e.getResponseCode() == HttpURLConnection.HTTP_NOT_FOUND) {
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412 | logger.warning(tr("Server replied with response code 404, retrying with an individual request for each primitive"));
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413 | singleGetIdPackage(type, pkg);
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414 | } else
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415 | throw e;
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416 | }
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417 | }
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418 | }
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419 |
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420 | /**
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421 | * invokes one or more Multi Gets to fetch the {@see OsmPrimitive}s and replies
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422 | * the dataset of retrieved primitives. Note that the dataset includes non visible primitives too!
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423 | * In contrast to a simple Get for a node, a way, or a relation, a Multi Get always replies
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424 | * the latest version of the primitive (if any), even if the primitive is not visible (i.e. if
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425 | * visible==false).
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426 | *
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427 | * Invoke {@see #getMissingPrimitives()} to get a list of primitives which have not been
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428 | * found on the server (the server response code was 404)
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429 | *
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430 | * Invoke {@see #getSkippedWay()} to get a list of ways which this reader could not build from
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431 | * the fetched data because the ways refer to nodes which don't exist on the server.
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432 | *
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433 | * @return the parsed data
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434 | * @exception OsmTransferException thrown if an error occurs while communicating with the API server
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435 | * @see #getMissingPrimitives()
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436 | * @see #getSkippedWays()
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437 | *
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438 |
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439 | */
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440 | @Override
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441 | public DataSet parseOsm() throws OsmTransferException {
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442 | skippedWayIds = new HashSet<Long>();
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443 | missingPrimitives = new HashSet<Long>();
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444 |
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445 | fetchPrimitives(nodes,OsmPrimitiveType.NODE);
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446 | fetchPrimitives(ways,OsmPrimitiveType.WAY);
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447 | fetchPrimitives(relations,OsmPrimitiveType.RELATION);
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448 | return outputDataSet;
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449 | }
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450 |
|
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451 | /**
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452 | * replies the set of {@see Way}s which were present in the data fetched from the
|
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453 | * server but which were not included in the JOSM dataset because they referred
|
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454 | * to nodes not present in the dataset
|
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455 | *
|
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456 | * @return the set of ids of skipped ways
|
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457 | */
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458 | public Set<Long> getSkippedWays() {
|
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459 | return skippedWayIds;
|
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460 | }
|
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461 |
|
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462 | /**
|
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463 | * replies the set of ids of all primitives for which a fetch request to the
|
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464 | * server was submitted but which are not available from the server (the server
|
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465 | * replied a return code of 404)
|
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466 | *
|
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467 | * @return the set of ids of missing primitives
|
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468 | */
|
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469 | public Set<Long> getMissingPrimitives() {
|
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470 | return missingPrimitives;
|
---|
471 | }
|
---|
472 | }
|
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