// License: GPL. Copyright 2007 by Immanuel Scholz and others
package org.openstreetmap.josm.data.osm;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.HashSet;
import java.util.List;
import java.util.concurrent.atomic.AtomicLong;
/**
* A simple class to keep a list of user names.
*
* Instead of storing user names as strings with every OSM primitive, we store
* a reference to an user object, and make sure that for each username there
* is only one user object.
*
*
*/
public class User {
static private AtomicLong uidCounter = new AtomicLong();
/**
* the map of known users
*/
private static HashMap<Long,User> userMap = new HashMap<Long,User>();
private static long getNextLocalUid() {
return uidCounter.decrementAndGet();
}
/**
* Creates a local user with the given name
*
* @param name the name
*/
public static User createLocalUser(String name) {
User user = new User(getNextLocalUid(), name);
userMap.put(user.getId(), user);
return user;
}
/**
* Creates a user known to the OSM server
*
* @param uid the user id
* @param name the name
*/
public static User createOsmUser(long uid, String name) {
User user = userMap.get(uid);
if (user == null) {
user = new User(uid, name);
userMap.put(user.getId(), user);
}
user.addName(name);
return user;
}
/**
* clears the static map of user ids to user objects
*
*/
public static void clearUserMap() {
userMap.clear();
}
/**
* Returns the user with user id <code>uid</code> or null if this user doesn't exist
*
* @param uid the user id
* @return the user; null, if there is no user with this id
*/
public static User getById(long uid) {
return userMap.get(uid);
}
/**
* Returns the list of users with name <code>name</code> or the empty list if
* no such users exist
*
* @param name the user name
* @return the list of users with name <code>name</code> or the empty list if
* no such users exist
*/
public static List<User> getByName(String name) {
if (name == null) {
name = "";
}
List<User> ret = new ArrayList<User>();
for (User user: userMap.values()) {
if (user.hasName(name)) {
ret.add(user);
}
}
return ret;
}
/** the user name */
private final HashSet<String> names = new HashSet<String>();
/** the user id */
private final long uid;
/**
* Replies the user name
*
* @return the user name. Never null, but may be the empty string
*/
public String getName() {
StringBuilder sb = new StringBuilder();
for (String name: names) {
sb.append(name);
sb.append('/');
}
sb.deleteCharAt(sb.length() - 1);
return sb.toString();
}
/**
* Returns the list of user names
*
* @returns list of names
*/
public ArrayList<String> getNames() {
return new ArrayList<String>(names);
}
/**
* Adds a user name to the list if it is not there, yet.
*
* @param name
*/
public void addName(String name) {
names.add(name);
}
/**
* Returns true if the name is in the names list
*
* @param name
*/
public boolean hasName(String name) {
return names.contains(name);
}
/**
* Replies the user id. If this user is known to the OSM server the positive user id
* from the server is replied. Otherwise, a negative local value is replied.
*
* A negative local is only unique during an editing session. It is lost when the
* application is closed and there is no guarantee that a negative local user id is
* always bound to a user with the same name.
*
*/
public long getId() {
return uid;
}
/** private constructor, only called from get method. */
private User(long uid, String name) {
this.uid = uid;
if (name != null) {
addName(name);
}
}
public boolean isOsmUser() {
return uid > 0;
}
public boolean isLocalUser() {
return uid < 0;
}
@Override
public int hashCode() {
final int prime = 31;
int result = 1;
result = prime * result + getName().hashCode();
result = prime * result + (int) (uid ^ (uid >>> 32));
return result;
}
@Override
public boolean equals(Object obj) {
if (! (obj instanceof User))
return false;
User other = (User) obj;
if (uid != other.uid)
return false;
return true;
}
}