org.apache.catalina.users

## Class MemoryUserDatabase

- java.lang.Object
- - org.apache.catalina.users.MemoryUserDatabase

- All Implemented Interfaces:
    UserDatabase

      public class MemoryUserDatabase
      extends Object
      implements UserDatabase

  Concrete implementation of `UserDatabase` that loads all defined users, groups, and roles into an in-memory data structure, and uses a specified XML file for its persistent storage.

  This class is thread-safe.

  This class does not enforce what, in an RDBMS, would be called referential integrity. Concurrent modifications may result in inconsistent data such as a User retaining a reference to a Role that has been removed from the database.

  Since:
    4.1
  Author:
    Craig R. McClanahan

- - ### Field Summary

    Fields
    Modifier and Type | Field and Description
    --- | ---
    `protected Map<String,Group>` | `groups` The set of `Group`s defined in this database, keyed by group name.
    `protected String` | `id` The unique global identifier of this user database.
    `protected String` | `pathname` The relative (to `catalina.base`) or absolute pathname to the XML file in which we will save our persistent information.
    `protected String` | `pathnameNew` The relative or absolute pathname of the file in which we write our new information prior to renaming.
    `protected String` | `pathnameOld` The relative or absolute pathname to the file in which our old information is stored while renaming is in progress.
    `protected boolean` | `readonly` A flag, indicating if the user database is read only.
    `protected Map<String,Role>` | `roles` The set of `Role`s defined in this database, keyed by role name.
    `protected Map<String,User>` | `users` The set of `User`s defined in this database, keyed by user name.

  - ### Constructor Summary

    Constructors
    Constructor and Description
    `MemoryUserDatabase()` Create a new instance with default values.
    `MemoryUserDatabase(String id)` Create a new instance with the specified values.

  - ### Method Summary

    Methods
    Modifier and Type | Method and Description
    --- | ---
    `void` | `backgroundProcess()`
    `void` | `close()` Finalize access to this user database.
    `Group` | `createGroup(String groupname, String description)` Create and return a new `Group` defined in this user database.
    `Role` | `createRole(String rolename, String description)` Create and return a new `Role` defined in this user database.
    `User` | `createUser(String username, String password, String fullName)` Create and return a new `User` defined in this user database.
    `Group` | `findGroup(String groupname)` Return the `Group` with the specified group name, if any; otherwise return `null`.
    `Role` | `findRole(String rolename)` Return the `Role` with the specified role name, if any; otherwise return `null`.
    `User` | `findUser(String username)` Return the `User` with the specified user name, if any; otherwise return `null`.
    `Iterator<Group>` | `getGroups()`
    `String` | `getId()`
    `String` | `getPathname()`
    `boolean` | `getReadonly()`
    `Iterator<Role>` | `getRoles()`
    `Iterator<User>` | `getUsers()`
    `boolean` | `getWatchSource()`
    `boolean` | `isWriteable()` Check for permissions to save this user database to persistent storage location.
    `void` | `open()` Initialize access to this user database.
    `void` | `removeGroup(Group group)` Remove the specified `Group` from this user database.
    `void` | `removeRole(Role role)` Remove the specified `Role` from this user database.
    `void` | `removeUser(User user)` Remove the specified `User` from this user database.
    `void` | `save()` Save any updated information to the persistent storage location for this user database.
    `void` | `setPathname(String pathname)` Set the relative or absolute pathname to the persistent storage file.
    `void` | `setReadonly(boolean readonly)` Setting the readonly status of the user database
    `void` | `setWatchSource(boolean watchSource)`
    `String` | `toString()` Return a String representation of this UserDatabase.

    - ### Methods inherited from class java.lang.Object

      `clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait`

- - ### Field Detail

    - #### groups

          protected final Map<String,Group> groups

      The set of `Group`s defined in this database, keyed by group name.

    - #### id

          protected final String id

      The unique global identifier of this user database.

    - #### pathname

          protected String pathname

      The relative (to `catalina.base`) or absolute pathname to the XML file in which we will save our persistent information.

    - #### pathnameOld

          protected String pathnameOld

      The relative or absolute pathname to the file in which our old information is stored while renaming is in progress.

    - #### pathnameNew

          protected String pathnameNew

      The relative or absolute pathname of the file in which we write our new information prior to renaming.

    - #### readonly

          protected boolean readonly

      A flag, indicating if the user database is read only.

    - #### roles

          protected final Map<String,Role> roles

      The set of `Role`s defined in this database, keyed by role name.

    - #### users

          protected final Map<String,User> users

      The set of `User`s defined in this database, keyed by user name.

  - ### Constructor Detail

    - #### MemoryUserDatabase

          public MemoryUserDatabase()

      Create a new instance with default values.

    - #### MemoryUserDatabase

          public MemoryUserDatabase(String id)

      Create a new instance with the specified values.
      Parameters:
        `id` - Unique global identifier of this user database

  - ### Method Detail

    - #### getGroups

          public Iterator<Group> getGroups()

      Specified by:
        `getGroups` in interface `UserDatabase`
      Returns:
        the set of `Group`s defined in this user database.

    - #### getId

          public String getId()

      Specified by:
        `getId` in interface `UserDatabase`
      Returns:
        the unique global identifier of this user database.

    - #### getPathname

          public String getPathname()

      Returns:
        the relative or absolute pathname to the persistent storage file.

    - #### setPathname

          public void setPathname(String pathname)

      Set the relative or absolute pathname to the persistent storage file.
      Parameters:
        `pathname` - The new pathname

    - #### getReadonly

          public boolean getReadonly()

      Returns:
        the readonly status of the user database

    - #### setReadonly

          public void setReadonly(boolean readonly)

      Setting the readonly status of the user database
      Parameters:
        `readonly` - the new status

    - #### getWatchSource

          public boolean getWatchSource()

    - #### setWatchSource

          public void setWatchSource(boolean watchSource)

    - #### getRoles

          public Iterator<Role> getRoles()

      Specified by:
        `getRoles` in interface `UserDatabase`
      Returns:
        the set of `Role`s defined in this user database.

    - #### getUsers

          public Iterator<User> getUsers()

      Specified by:
        `getUsers` in interface `UserDatabase`
      Returns:
        the set of `User`s defined in this user database.

    - #### close

          public void close()
                     throws Exception

      Finalize access to this user database.
      Specified by:
        `close` in interface `UserDatabase`
      Throws:
        `Exception` - if any exception is thrown during closing

    - #### createGroup

          public Group createGroup(String groupname,
                          String description)

      Create and return a new `Group` defined in this user database.
      Specified by:
        `createGroup` in interface `UserDatabase`
      Parameters:
        `groupname` - The group name of the new group (must be unique)
        `description` - The description of this group
      Returns:
        The new group

    - #### createRole

          public Role createRole(String rolename,
                        String description)

      Create and return a new `Role` defined in this user database.
      Specified by:
        `createRole` in interface `UserDatabase`
      Parameters:
        `rolename` - The role name of the new group (must be unique)
        `description` - The description of this group
      Returns:
        The new role

    - #### createUser

          public User createUser(String username,
                        String password,
                        String fullName)

      Create and return a new `User` defined in this user database.
      Specified by:
        `createUser` in interface `UserDatabase`
      Parameters:
        `username` - The logon username of the new user (must be unique)
        `password` - The logon password of the new user
        `fullName` - The full name of the new user
      Returns:
        The new user

    - #### findGroup

          public Group findGroup(String groupname)

      Return the `Group` with the specified group name, if any; otherwise return `null`.
      Specified by:
        `findGroup` in interface `UserDatabase`
      Parameters:
        `groupname` - Name of the group to return
      Returns:
        the `Group` with the specified group name, if any; otherwise return `null`.

    - #### findRole

          public Role findRole(String rolename)

      Return the `Role` with the specified role name, if any; otherwise return `null`.
      Specified by:
        `findRole` in interface `UserDatabase`
      Parameters:
        `rolename` - Name of the role to return
      Returns:
        the `Role` with the specified role name, if any; otherwise return `null`.

    - #### findUser

          public User findUser(String username)

      Return the `User` with the specified user name, if any; otherwise return `null`.
      Specified by:
        `findUser` in interface `UserDatabase`
      Parameters:
        `username` - Name of the user to return
      Returns:
        the `User` with the specified user name, if any; otherwise return `null`.

    - #### open

          public void open()
                    throws Exception

      Initialize access to this user database.
      Specified by:
        `open` in interface `UserDatabase`
      Throws:
        `Exception` - if any exception is thrown during opening

    - #### removeGroup

          public void removeGroup(Group group)

      Remove the specified `Group` from this user database.
      Specified by:
        `removeGroup` in interface `UserDatabase`
      Parameters:
        `group` - The group to be removed

    - #### removeRole

          public void removeRole(Role role)

      Remove the specified `Role` from this user database.
      Specified by:
        `removeRole` in interface `UserDatabase`
      Parameters:
        `role` - The role to be removed

    - #### removeUser

          public void removeUser(User user)

      Remove the specified `User` from this user database.
      Specified by:
        `removeUser` in interface `UserDatabase`
      Parameters:
        `user` - The user to be removed

    - #### isWriteable

          public boolean isWriteable()

      Check for permissions to save this user database to persistent storage location.
      Returns:
        `true` if the database is writable

    - #### save

          public void save()
                    throws Exception

      Save any updated information to the persistent storage location for this user database.
      Specified by:
        `save` in interface `UserDatabase`
      Throws:
        `Exception` - if any exception is thrown during saving

    - #### backgroundProcess

          public void backgroundProcess()

    - #### toString

          public String toString()

      Return a String representation of this UserDatabase.
      Overrides:
        `toString` in class `Object`

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