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/*
* Copyright (C) 2014 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.google.gct.login;
import com.google.common.collect.Lists;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;
import java.util.Collection;
import java.util.LinkedHashMap;
import java.util.Map;
/**
* Tracks which users are logged in, and which of these (if any) is currently designated as the
* "active user". Maintains a map from email addresses of logged-in users to the corresponding
* {@link CredentialedUser} objects.
*/
public class CredentialedUserRoster {
private final LinkedHashMap<String, CredentialedUser> myAllUsers = new LinkedHashMap<String, CredentialedUser>();
private final Collection<GoogleLoginListener> myListeners = Lists.newLinkedList();
private CredentialedUser myActiveUser;
/**
* Returns a copy of the map of the current logged in users.
* @return Copy of current logged in users.
*/
@NotNull
public LinkedHashMap<String, CredentialedUser> getAllUsers() {
synchronized (this) {
LinkedHashMap<String, CredentialedUser> clone = new LinkedHashMap<String, CredentialedUser>();
clone.putAll(myAllUsers);
return clone;
}
}
/**
* Completely overrides current map of logged in users with <code>users</code>.
* @param users Map of users to set.
*/
public void setAllUsers(Map<String, CredentialedUser> users) {
synchronized (this) {
myAllUsers.clear();
myAllUsers.putAll(users);
}
}
/**
* Returns the active user.
* @return the active user.
*/
@Nullable
public CredentialedUser getActiveUser() {
return myActiveUser;
}
/**
* Sets the active user to <code>userEmail</code> if <code>userEmail</code> is a logged
* in user.
* @param userEmail The user to be set as active.
* @throws IllegalArgumentException if the <code>userEmail</code> does not exist i.e. is
* not a logged in user.
*/
public void setActiveUser(@NotNull String userEmail) throws IllegalArgumentException {
synchronized (this) {
if (!myAllUsers.containsKey(userEmail)) {
throw new IllegalArgumentException(userEmail + " is not a logged in user.");
}
if (myActiveUser != null) {
myActiveUser.setActive(false);
}
myActiveUser = myAllUsers.get(userEmail);
myActiveUser.setActive(true);
GoogleLoginPrefs.saveActiveUser(userEmail);
notifyLoginStatusChange();
}
}
/**
* If there is an active user, makes the active use no longer active.
*/
public void removeActiveUser() {
synchronized (this) {
if (myActiveUser != null) {
myActiveUser.setActive(false);
myActiveUser = null;
GoogleLoginPrefs.removeActiveUser();
notifyLoginStatusChange();
}
}
}
/**
* Returns the number of logged in users.
* @return Number of logged in users.
*/
public int numberOfUsers() {
synchronized (this) {
return myAllUsers.size();
}
}
/**
* Returns true if there is an active user and false otherwise.
* @return True if there is an active user and false otherwise.
*/
public boolean isActiveUserAvailable() {
return myActiveUser != null;
}
/**
* Adds a user to the list of current users. If the user already exists,
* the user will be updated.
* The <code>user</code> becomes the active user.
* @param user
* @return
*/
public void addUser(CredentialedUser user) {
synchronized (this) {
myAllUsers.put(user.getEmail(), user);
setActiveUser(user.getEmail());
}
}
/**
* Remove <code>userEmail</code> from the list of logged in users if <code>userEmail</code> is
* a logged in user. If <code>userEmail</code> is the active user, there would no longer be
* an active user once <code>userEmail</code> is removed. Another user will have to explicitly
* selected for there to be an active user again.
* @param userEmail The user to be removed.
* @return True if <code>userEmail</code> was successfully removed from the list of
* logged in users and false if <code>userEmail</code> is not a logged in user.
*/
public boolean removeUser(String userEmail) {
synchronized (this) {
if (!myAllUsers.containsKey(userEmail)) {
return false;
}
if (myActiveUser.getEmail().equals(userEmail)) {
myActiveUser = null;
GoogleLoginPrefs.removeActiveUser();
}
myAllUsers.remove(userEmail);
notifyLoginStatusChange();
return true;
}
}
/**
* Removes all logged in users. There is no active user after this.
*/
public void removeAllUsers() {
synchronized (this) {
myAllUsers.clear();
myActiveUser = null;
GoogleLoginPrefs.removeAllUsers();
notifyLoginStatusChange();
}
}
/**
* Register a specified {@link GoogleLoginListener} to be notified of changes to the
* logged-in state.
*
* @param listener the specified {@code GoogleLoginListener}
*/
void addLoginListener(GoogleLoginListener listener) {
synchronized(myListeners) {
myListeners.add(listener);
}
}
private void notifyLoginStatusChange() {
synchronized(myListeners) {
for (GoogleLoginListener listener : myListeners) {
listener.statusChanged();
}
}
}
}
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