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## com.sun.mail.pop3
Class POP3Folder

    java.lang.Object
      |
      +--javax.mail.Folder
            |
            +--com.sun.mail.pop3.POP3Folder

public class POP3Folder
extends Folder

A POP3 Folder (can only be "INBOX"). See the com.sun.mail.pop3 package documentation for further information on the POP3 protocol provider.

Fields inherited from class javax.mail.Folder
`HOLDS_FOLDERS, HOLDS_MESSAGES, mode, READ_ONLY, READ_WRITE, store`

Method Summary
`void` | `appendMessages(Message[] msgs)` Always throws `MethodNotSupportedException` because the POP3 protocol doesn't support appending messages.
`void` | `close(boolean expunge)` Close this Folder.
`boolean` | `create(int type)` Always returns `false`; the POP3 protocol doesn't support creating folders.
`protected POP3Message` | `createMessage(Folder f, int msgno)`
`boolean` | `delete(boolean recurse)` Always throws `MethodNotSupportedException` because the POP3 protocol doesn't allow the INBOX to be deleted.
`boolean` | `exists()` Always true for the folder "INBOX", always false for any other name.
`Message[]` | `expunge()` Always throws `MethodNotSupportedException` because the POP3 protocol doesn't support expunging messages without closing the folder; call the `close` method with the `expunge` argument set to `true` instead.
`void` | `fetch(Message[] msgs, FetchProfile fp)` Prefetch information about POP3 messages.
`protected void` | `finalize()` Close the folder when we're finalized.
`Folder` | `getFolder(java.lang.String name)` Always throws `MessagingException` because no POP3 folders can contain subfolders.
`java.lang.String` | `getFullName()` Returns the full name of this Folder.
`Message` | `getMessage(int msgno)` Get the Message object corresponding to the given message number.
`int` | `getMessageCount()` Will not change while the folder is open because the POP3 protocol doesn't support notification of new messages arriving in open folders.
`java.lang.String` | `getName()` Returns the name of this Folder.
`Folder` | `getParent()` Returns the parent folder of this folder.
`Flags` | `getPermanentFlags()` Always returns an empty `Flags` object because the POP3 protocol doesn't support any permanent flags.
`char` | `getSeparator()` Always returns a NUL character because POP3 doesn't support a hierarchy.
`int` | `getSize()` Return the size of this folder, as was returned by the POP3 STAT command when this folder was opened.
`int` | `getType()` Always returns Folder.HOLDS_MESSAGES.
`java.lang.String` | `getUID(Message msg)` Return the unique ID string for this message, or null if not available.
`boolean` | `hasNewMessages()` Always returns `false`; the POP3 protocol provides no way to determine when a new message arrives.
`boolean` | `isOpen()` Indicates whether this Folder is in the 'open' state.
`Folder[]` | `list(java.lang.String pattern)` Always throws `MessagingException` because no POP3 folders can contain subfolders.
`protected void` | `notifyMessageChangedListeners(int type, Message m)` Notify all MessageChangedListeners.
`void` | `open(int mode)` Throws `FolderNotFoundException` unless this folder is named "INBOX".
`boolean` | `renameTo(Folder f)` Always throws `MethodNotSupportedException` because the POP3 protocol doesn't support multiple folders.

Methods inherited from class javax.mail.Folder
`addConnectionListener, addFolderListener, addMessageChangedListener, addMessageCountListener, copyMessages, getDeletedMessageCount, getMessages, getMessages, getMessages, getMode, getNewMessageCount, getStore, getUnreadMessageCount, getURLName, isSubscribed, list, listSubscribed, listSubscribed, notifyConnectionListeners, notifyFolderListeners, notifyFolderRenamedListeners, notifyMessageAddedListeners, notifyMessageRemovedListeners, removeConnectionListener, removeFolderListener, removeMessageChangedListener, removeMessageCountListener, search, search, setFlags, setFlags, setFlags, setSubscribed, toString`

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

Method Detail

### getName

    public java.lang.String getName()

  Description copied from class: `Folder`
  Returns the name of this Folder.

  This method can be invoked on a closed Folder.

  Overrides:
    `getName` in class `Folder`
  Following copied from class: `javax.mail.Folder`
  Returns:
    name of the Folder

### getFullName

    public java.lang.String getFullName()

  Description copied from class: `Folder`
  Returns the full name of this Folder. If the folder resides under the root hierarchy of this Store, the returned name is relative to the root. Otherwise an absolute name, starting with the hierarchy delimiter, is returned.

  This method can be invoked on a closed Folder.

  Overrides:
    `getFullName` in class `Folder`
  Following copied from class: `javax.mail.Folder`
  Returns:
    full name of the Folder

### getParent

    public Folder getParent()

  Description copied from class: `Folder`
  Returns the parent folder of this folder. This method can be invoked on a closed Folder. If this folder is the top of a folder hierarchy, this method returns null.

  Note that since Folder objects are not cached, invoking this method returns a new distinct Folder object.

  Overrides:
    `getParent` in class `Folder`
  Following copied from class: `javax.mail.Folder`
  Returns:
    Parent folder

### exists

    public boolean exists()

  Always true for the folder "INBOX", always false for any other name.
  Overrides:
    `exists` in class `Folder`
  Returns:
    true for INBOX, false otherwise

### list

    public Folder[] list(java.lang.String pattern)
                  throws MessagingException

  Always throws `MessagingException` because no POP3 folders can contain subfolders.
  Overrides:
    `list` in class `Folder`
  Throws:
    `MessagingException` - always

### getSeparator

    public char getSeparator()

  Always returns a NUL character because POP3 doesn't support a hierarchy.
  Overrides:
    `getSeparator` in class `Folder`
  Returns:
    NUL

### getType

    public int getType()

  Always returns Folder.HOLDS_MESSAGES.
  Overrides:
    `getType` in class `Folder`
  Returns:
    Folder.HOLDS_MESSAGES

### create

    public boolean create(int type)
                   throws MessagingException

  Always returns `false`; the POP3 protocol doesn't support creating folders.
  Overrides:
    `create` in class `Folder`
  Returns:
    false

### hasNewMessages

    public boolean hasNewMessages()
                           throws MessagingException

  Always returns `false`; the POP3 protocol provides no way to determine when a new message arrives.
  Overrides:
    `hasNewMessages` in class `Folder`
  Returns:
    false

### getFolder

    public Folder getFolder(java.lang.String name)
                     throws MessagingException

  Always throws `MessagingException` because no POP3 folders can contain subfolders.
  Overrides:
    `getFolder` in class `Folder`
  Throws:
    `MessagingException` - always

### delete

    public boolean delete(boolean recurse)
                   throws MessagingException

  Always throws `MethodNotSupportedException` because the POP3 protocol doesn't allow the INBOX to be deleted.
  Overrides:
    `delete` in class `Folder`
  Throws:
    `MethodNotSupportedException` - always

### renameTo

    public boolean renameTo(Folder f)
                     throws MessagingException

  Always throws `MethodNotSupportedException` because the POP3 protocol doesn't support multiple folders.
  Overrides:
    `renameTo` in class `Folder`
  Throws:
    `MethodNotSupportedException` - always

### open

    public void open(int mode)
              throws MessagingException

  Throws `FolderNotFoundException` unless this folder is named "INBOX".
  Overrides:
    `open` in class `Folder`
  Throws:
    `FolderNotFoundException` - if not INBOX
    `AuthenticationException` - authentication failures
    `MessagingException` - other open failures

### close

    public void close(boolean expunge)
               throws MessagingException

  Description copied from class: `Folder`
  Close this Folder. This method is valid only on open Folders.

  A CLOSED ConnectionEvent is delivered to any ConnectionListeners registered on this Folder. Note that the folder is closed even if this method terminates abnormally by throwing a MessagingException.

  Overrides:
    `close` in class `Folder`
  Following copied from class: `javax.mail.Folder`
  Parameters:
    `expunge` - expunges all deleted messages if this flag is true
  Throws:
    `IllegalStateException` - if this folder is not opened
    `MessagingException` -
  See Also:
    `ConnectionEvent`

### isOpen

    public boolean isOpen()

  Description copied from class: `Folder`
  Indicates whether this Folder is in the 'open' state.
  Overrides:
    `isOpen` in class `Folder`
  Following copied from class: `javax.mail.Folder`
  Returns:
    true if this Folder is in the 'open' state.

### getPermanentFlags

    public Flags getPermanentFlags()

  Always returns an empty `Flags` object because the POP3 protocol doesn't support any permanent flags.
  Overrides:
    `getPermanentFlags` in class `Folder`
  Returns:
    empty Flags object

### getMessageCount

    public int getMessageCount()
                        throws MessagingException

  Will not change while the folder is open because the POP3 protocol doesn't support notification of new messages arriving in open folders.
  Overrides:
    `getMessageCount` in class `Folder`
  Following copied from class: `javax.mail.Folder`
  Returns:
    total number of messages. -1 may be returned by certain implementations if this method is invoked on a closed folder.
  Throws:
    `FolderNotFoundException` - if this folder does not exist.
    `MessagingException` -

### getMessage

    public Message getMessage(int msgno)
                       throws MessagingException

  Description copied from class: `Folder`
  Get the Message object corresponding to the given message number. A Message object's message number is the relative position of this Message in its Folder. Messages are numbered starting at 1 through the total number of message in the folder. Note that the message number for a particular Message can change during a session if other messages in the Folder are deleted and the Folder is expunged.

  Message objects are light-weight references to the actual message that get filled up on demand. Hence Folder implementations are expected to provide light-weight Message objects.

  Unlike Folder objects, repeated calls to getMessage with the same message number will return the same Message object, as long as no messages in this folder have been expunged.

  Since message numbers can change within a session if the folder is expunged , clients are advised not to use message numbers as references to messages. Use Message objects instead.

  Overrides:
    `getMessage` in class `Folder`
  Following copied from class: `javax.mail.Folder`
  Parameters:
    `msgnum` - the message number
  Returns:
    the Message object
  Throws:
    `FolderNotFoundException` - if this folder does not exist.
    `IllegalStateException` - if this folder is not opened
    `IndexOutOfBoundsException` - if the message number is out of range.
    `MessagingException` -
  See Also:
    `Folder.getMessageCount()`, `Folder.fetch(javax.mail.Message[], javax.mail.FetchProfile)`

### createMessage

    protected POP3Message createMessage(Folder f,
                                        int msgno)
                                 throws MessagingException

### appendMessages

    public void appendMessages(Message[] msgs)
                        throws MessagingException

  Always throws `MethodNotSupportedException` because the POP3 protocol doesn't support appending messages.
  Overrides:
    `appendMessages` in class `Folder`
  Throws:
    `MethodNotSupportedException` - always

### expunge

    public Message[] expunge()
                      throws MessagingException

  Always throws `MethodNotSupportedException` because the POP3 protocol doesn't support expunging messages without closing the folder; call the `close` method with the `expunge` argument set to `true` instead.
  Overrides:
    `expunge` in class `Folder`
  Throws:
    `MethodNotSupportedException` - always

### fetch

    public void fetch(Message[] msgs,
                      FetchProfile fp)
               throws MessagingException

  Prefetch information about POP3 messages. If the FetchProfile contains `UIDFolder.FetchProfileItem.UID`, POP3 UIDs for all messages in the folder are fetched using the POP3 UIDL command. If the FetchProfile contains `FetchProfile.Item.ENVELOPE`, the headers and size of all messages are fetched using the POP3 TOP and LIST commands.
  Overrides:
    `fetch` in class `Folder`
  Following copied from class: `javax.mail.Folder`
  Parameters:
    `msgs` - fetch items for these messages
    `fp` - the FetchProfile
  Throws:
    `IllegalStateException` - if this folder is not opened
    `MessagingException.` -

### getUID

    public java.lang.String getUID(Message msg)
                            throws MessagingException

  Return the unique ID string for this message, or null if not available. Uses the POP3 UIDL command.
  Returns:
    unique ID string
  Throws:
    `MessagingException` -

### getSize

    public int getSize()
                throws MessagingException

  Return the size of this folder, as was returned by the POP3 STAT command when this folder was opened.
  Returns:
    folder size
  Throws:
    `IllegalStateException` - if the folder isn't open

### finalize

    protected void finalize()
                     throws java.lang.Throwable

  Close the folder when we're finalized.
  Overrides:
    `finalize` in class `Folder`

### notifyMessageChangedListeners

    protected void notifyMessageChangedListeners(int type,
                                                 Message m)

  Description copied from class: `Folder`
  Notify all MessageChangedListeners. Folder implementations are expected to use this method to broadcast MessageChanged events.

  The provided implementation queues the event into an internal event queue. An event dispatcher thread dequeues events from the queue and dispatches them to registered MessageChangedListeners. Note that the event dispatching occurs in a separate thread, thus avoiding potential deadlock problems.

  Overrides:
    `notifyMessageChangedListeners` in class `Folder`

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