1 | // License: GPL. For details, see LICENSE file.
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2 | package org.openstreetmap.josm.data.osm;
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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.util.ArrayList;
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7 | import java.util.HashMap;
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8 | import java.util.HashSet;
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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.Set;
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12 |
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13 | import org.openstreetmap.josm.tools.Utils;
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14 |
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15 | /**
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16 | * A simple class to keep a list of user names.
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17 | *
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18 | * Instead of storing user names as strings with every OSM primitive, we store
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19 | * a reference to an user object, and make sure that for each username there
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20 | * is only one user object.
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21 | *
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22 | *
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23 | */
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24 | public final class User {
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25 |
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26 | private static long uidCounter = 0;
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27 |
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28 | /**
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29 | * the map of known users
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30 | */
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31 | private static Map<Long,User> userMap = new HashMap<>();
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32 |
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33 | /**
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34 | * The anonymous user is a local user used in places where no user is known.
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35 | * @see #getAnonymous()
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36 | */
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37 | private static final User anonymous = createLocalUser(tr("<anonymous>"));
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38 |
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39 | private static long getNextLocalUid() {
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40 | uidCounter--;
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41 | return uidCounter;
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42 | }
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43 |
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44 | /**
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45 | * Creates a local user with the given name
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46 | *
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47 | * @param name the name
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48 | * @return a new local user with the given name
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49 | */
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50 | public static synchronized User createLocalUser(String name) {
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51 | for(long i = -1; i >= uidCounter; --i) {
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52 | User olduser = getById(i);
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53 | if(olduser != null && olduser.hasName(name))
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54 | return olduser;
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55 | }
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56 | User user = new User(getNextLocalUid(), name);
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57 | userMap.put(user.getId(), user);
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58 | return user;
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59 | }
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60 |
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61 | /**
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62 | * Creates a user known to the OSM server
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63 | *
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64 | * @param uid the user id
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65 | * @param name the name
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66 | * @return a new OSM user with the given name and uid
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67 | */
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68 | public static synchronized User createOsmUser(long uid, String name) {
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69 | User user = userMap.get(uid);
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70 | if (user == null) {
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71 | user = new User(uid, name);
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72 | userMap.put(user.getId(), user);
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73 | }
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74 | if (name != null) user.addName(name);
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75 | return user;
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76 | }
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77 |
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78 | /**
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79 | * clears the static map of user ids to user objects
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80 | */
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81 | public static synchronized void clearUserMap() {
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82 | userMap.clear();
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83 | }
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84 |
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85 | /**
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86 | * Returns the user with user id <code>uid</code> or null if this user doesn't exist
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87 | *
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88 | * @param uid the user id
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89 | * @return the user; null, if there is no user with this id
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90 | */
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91 | public static synchronized User getById(long uid) {
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92 | return userMap.get(uid);
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93 | }
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94 |
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95 | /**
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96 | * Returns the list of users with name <code>name</code> or the empty list if
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97 | * no such users exist
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98 | *
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99 | * @param name the user name
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100 | * @return the list of users with name <code>name</code> or the empty list if
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101 | * no such users exist
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102 | */
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103 | public static synchronized List<User> getByName(String name) {
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104 | if (name == null) {
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105 | name = "";
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106 | }
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107 | List<User> ret = new ArrayList<>();
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108 | for (User user: userMap.values()) {
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109 | if (user.hasName(name)) {
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110 | ret.add(user);
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111 | }
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112 | }
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113 | return ret;
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114 | }
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115 |
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116 | /**
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117 | * Replies the anonymous user
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118 | * @return The anonymous user
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119 | */
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120 | public static User getAnonymous() {
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121 | return anonymous;
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122 | }
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123 |
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124 | /** the user name */
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125 | private final Set<String> names = new HashSet<>();
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126 | /** the user id */
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127 | private final long uid;
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128 |
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129 | /**
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130 | * Replies the user name
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131 | *
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132 | * @return the user name. Never <code>null</code>, but may be the empty string
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133 | */
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134 | public String getName() {
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135 | return Utils.join("/", names);
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136 | }
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137 |
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138 | /**
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139 | * Returns the list of user names
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140 | *
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141 | * @return list of names
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142 | */
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143 | public List<String> getNames() {
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144 | return new ArrayList<>(names);
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145 | }
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146 |
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147 | /**
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148 | * Adds a user name to the list if it is not there, yet.
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149 | *
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150 | * @param name
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151 | */
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152 | public void addName(String name) {
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153 | names.add(name);
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154 | }
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155 |
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156 | /**
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157 | * Returns true if the name is in the names list
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158 | *
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159 | * @param name
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160 | * @return <code>true</code> if the name is in the names list
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161 | */
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162 | public boolean hasName(String name) {
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163 | return names.contains(name);
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164 | }
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165 |
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166 | /**
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167 | * Replies the user id. If this user is known to the OSM server the positive user id
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168 | * from the server is replied. Otherwise, a negative local value is replied.
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169 | *
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170 | * A negative local is only unique during an editing session. It is lost when the
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171 | * application is closed and there is no guarantee that a negative local user id is
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172 | * always bound to a user with the same name.
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173 | *
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174 | * @return the user id
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175 | */
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176 | public long getId() {
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177 | return uid;
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178 | }
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179 |
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180 | /** private constructor, only called from get method. */
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181 | private User(long uid, String name) {
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182 | this.uid = uid;
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183 | if (name != null) {
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184 | addName(name);
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185 | }
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186 | }
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187 |
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188 | /**
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189 | * Determines if this user is known to OSM
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190 | * @return {@code true} if this user is known to OSM, {@code false} otherwise
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191 | */
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192 | public boolean isOsmUser() {
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193 | return uid > 0;
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194 | }
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195 |
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196 | /**
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197 | * Determines if this user is local
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198 | * @return {@code true} if this user is local, {@code false} otherwise
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199 | */
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200 | public boolean isLocalUser() {
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201 | return uid < 0;
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202 | }
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203 |
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204 | @Override
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205 | public int hashCode() {
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206 | final int prime = 31;
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207 | int result = 1;
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208 | result = prime * result + getName().hashCode();
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209 | result = prime * result + (int) (uid ^ (uid >>> 32));
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210 | return result;
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211 | }
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212 |
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213 | @Override
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214 | public boolean equals(Object obj) {
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215 | if (! (obj instanceof User))
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216 | return false;
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217 | User other = (User) obj;
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218 | if (uid != other.uid)
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219 | return false;
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220 | return true;
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221 | }
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222 |
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223 | @Override
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224 | public String toString() {
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225 | StringBuilder s = new StringBuilder();
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226 | s.append("id:").append(uid);
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227 | if (names.size() == 1) {
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228 | s.append(" name:").append(getName());
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229 | } else if (names.size() > 1) {
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230 | s.append(String.format(" %d names:%s", names.size(), getName()));
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231 | }
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232 | return s.toString();
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233 | }
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234 | }
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