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## org.jivesoftware.openfire.user
Class UserManager

    java.lang.Object
      org.jivesoftware.openfire.user.UserManager

All Implemented Interfaces:
  org.xmpp.component.IQResultListener

    public class UserManager

extends Object
implements org.xmpp.component.IQResultListener

Manages users, including loading, creating and deleting.

Author:
  Matt Tucker
See Also:
  `User`

Method Summary
`void` | `answerTimeout(String packetId)`
`User` | `createUser(String username, String password, String name, String email)` Creates a new User.
`void` | `deleteUser(User user)` Deletes a user (optional operation).
`Collection<User>` | `findUsers(Set<String> fields, String query)` Searches for users based on a set of fields and a query string.
`Collection<User>` | `findUsers(Set<String> fields, String query, int startIndex, int numResults)` Searches for users based on a set of fields and a query string.
`static UserManager` | `getInstance()` Returns a singleton UserManager instance.
`Set<String>` | `getSearchFields()` Returns the set of fields that can be used for searching for users.
`User` | `getUser(String username)` Returns the User specified by username.
`int` | `getUserCount()` Returns the total number of users in the system.
`Collection<String>` | `getUsernames()` Returns an unmodifiable Collection of usernames of all users in the system.
`static UserProvider` | `getUserProvider()` Returns the currently-installed UserProvider.
`Collection<User>` | `getUsers()` Returns an unmodifiable Collection of all users in the system.
`Collection<User>` | `getUsers(int startIndex, int numResults)` Returns an unmodifiable Collection of all users starting at `startIndex` with the given number of results.
`boolean` | `isRegisteredUser(org.xmpp.packet.JID user)` Returns true if the specified JID belongs to a local or remote registered user.
`boolean` | `isRegisteredUser(String username)` Returns true if the specified local username belongs to a registered local user.
`void` | `receivedAnswer(org.xmpp.packet.IQ packet)`

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Method Detail

### getUserProvider

    public static UserProvider getUserProvider()

  Returns the currently-installed UserProvider. Warning: in virtually all cases the user provider should not be used directly. Instead, the appropriate methods in UserManager should be called. Direct access to the user provider is only provided for special-case logic.

  Returns:
    the current UserProvider.

### getInstance

    public static UserManager getInstance()

  Returns a singleton UserManager instance.

  Returns:
    a UserManager instance.

### createUser

    public User createUser(String username,
                           String password,
                           String name,
                           String email)
                    throws UserAlreadyExistsException

  Creates a new User. Required values are username and password. The email address and name can optionally be `null`, unless the UserProvider deems that either of them are required.

  Parameters:
    `username` - the new and unique username for the account.
    `password` - the password for the account (plain text).
    `name` - the name of the user, which can be `null` unless the UserProvider deems that it's required.
    `email` - the email address to associate with the new account, which can be `null`, unless the UserProvider deems that it's required.
  Returns:
    a new User.
  Throws:
    `UserAlreadyExistsException` - if the username already exists in the system.
    `UnsupportedOperationException` - if the provider does not support the operation.

### deleteUser

    public void deleteUser(User user)

  Deletes a user (optional operation).

  Parameters:
    `user` - the user to delete.

### getUser

    public User getUser(String username)
                 throws UserNotFoundException

  Returns the User specified by username.

  Parameters:
    `username` - the username of the user.
  Returns:
    the User that matches `username`.
  Throws:
    `UserNotFoundException` - if the user does not exist.

### getUserCount

    public int getUserCount()

  Returns the total number of users in the system.

  Returns:
    the total number of users.

### getUsers

    public Collection<User> getUsers()

  Returns an unmodifiable Collection of all users in the system.

  Returns:
    an unmodifiable Collection of all users.

### getUsernames

    public Collection<String> getUsernames()

  Returns an unmodifiable Collection of usernames of all users in the system.

  Returns:
    an unmodifiable Collection of all usernames in the system.

### getUsers

    public Collection<User> getUsers(int startIndex,
                                     int numResults)

  Returns an unmodifiable Collection of all users starting at `startIndex` with the given number of results. This is useful to support pagination in a GUI where you may only want to display a certain number of results per page. It is possible that the number of results returned will be less than that specified by `numResults` if `numResults` is greater than the number of records left to display.

  Parameters:
    `startIndex` - the beginning index to start the results at.
    `numResults` - the total number of results to return.
  Returns:
    a Collection of users in the specified range.

### getSearchFields

    public Set<String> getSearchFields()
                                throws UnsupportedOperationException

  Returns the set of fields that can be used for searching for users. Each field returned must support wild-card and keyword searching. For example, an implementation might send back the set {"Username", "Name", "Email"}. Any of those three fields can then be used in a search with the `findUsers(Set,String)` method.

  This method should throw an UnsupportedOperationException if this operation is not supported by the backend user store.

  Returns:
    the valid search fields.
  Throws:
    `UnsupportedOperationException` - if the provider does not support the operation (this is an optional operation).

### findUsers

    public Collection<User> findUsers(Set<String> fields,
                                      String query)
                               throws UnsupportedOperationException

  Searches for users based on a set of fields and a query string. The fields must be taken from the values returned by `getSearchFields()`. The query can include wildcards. For example, a search on the field "Name" with a query of "Ma*" might return user's with the name "Matt", "Martha" and "Madeline".

  This method throws an UnsupportedOperationException if this operation is not supported by the user provider.

  Parameters:
    `fields` - the fields to search on.
    `query` - the query string.
  Returns:
    a Collection of users that match the search.
  Throws:
    `UnsupportedOperationException` - if the provider does not support the operation (this is an optional operation).

### findUsers

    public Collection<User> findUsers(Set<String> fields,
                                      String query,
                                      int startIndex,
                                      int numResults)
                               throws UnsupportedOperationException

  Searches for users based on a set of fields and a query string. The fields must be taken from the values returned by `getSearchFields()`. The query can include wildcards. For example, a search on the field "Name" with a query of "Ma*" might return user's with the name "Matt", "Martha" and "Madeline".

  The startIndex and numResults parameters are used to page through search results. For example, if the startIndex is 0 and numResults is 10, the first 10 search results will be returned. Note that numResults is a request for the number of results to return and that the actual number of results returned may be fewer.

  This method should throw an UnsupportedOperationException if this operation is not supported by the backend user store.

  Parameters:
    `fields` - the fields to search on.
    `query` - the query string.
    `startIndex` - the starting index in the search result to return.
    `numResults` - the number of users to return in the search result.
  Returns:
    a Collection of users that match the search.
  Throws:
    `UnsupportedOperationException` - if the provider does not support the operation (this is an optional operation).

### isRegisteredUser

    public boolean isRegisteredUser(String username)

  Returns true if the specified local username belongs to a registered local user.

  Parameters:
    `username` - to username of the user to check it it's a registered user.
  Returns:
    true if the specified JID belongs to a local registered user.

### isRegisteredUser

    public boolean isRegisteredUser(org.xmpp.packet.JID user)

  Returns true if the specified JID belongs to a local or remote registered user. For remote users (i.e. domain does not match local domain) a disco#info request is going to be sent to the bare JID of the user.

  Parameters:
    `user` - to JID of the user to check it it's a registered user.
  Returns:
    true if the specified JID belongs to a local or remote registered user.

### receivedAnswer

    public void receivedAnswer(org.xmpp.packet.IQ packet)

  Specified by:
    `receivedAnswer` in interface `org.xmpp.component.IQResultListener`

### answerTimeout

    public void answerTimeout(String packetId)

  Specified by:
    `answerTimeout` in interface `org.xmpp.component.IQResultListener`

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