com.sun.mail.imap
Class IMAPFolder

java.lang.Object
  |
  +--javax.mail.Folder
        |
        +--com.sun.mail.imap.IMAPFolder

All Implemented Interfaces:

com.sun.mail.iap.ResponseHandler, UIDFolder

public class IMAPFolder

extends Folder

implements UIDFolder, com.sun.mail.iap.ResponseHandler

This class implements an IMAP folder.

A closed IMAPFolder object shares a protocol connection with its IMAPStore object. When the folder is opened, it gets its own protocol connection.

Applications that need to make use of IMAP-specific features may cast a Folder object to an IMAPFolder object and use the methods on this class. The getQuota and setQuota methods support the IMAP QUOTA extension. Refer to RFC 2087 for more information.

The getACL, addACL, removeACL, addRights, removeRights, listRights, and myRights methods support the IMAP ACL extension. Refer to RFC 2086 for more information.

The doCommand method and IMAPFolder.ProtocolCommand interface support use of arbitrary IMAP protocol commands.

See the com.sun.mail.imap package documentation for further information on the IMAP protocol provider.

WARNING: The APIs unique to this class should be considered EXPERIMENTAL. They may be changed in the future in ways that are incompatible with applications using the current APIs.

Inner Class Summary

static class	IMAPFolder.FetchProfileItem A fetch profile item for fetching headers.
static interface	IMAPFolder.ProtocolCommand A simple interface for user-defined IMAP protocol commands.

Inner classes inherited from class javax.mail.UIDFolder

UIDFolder.FetchProfileItem

Field Summary

protected Flags	availableFlags
protected boolean	exists
protected java.lang.String	fullName
protected java.util.Vector	messageCache
protected java.lang.Object	messageCacheLock
protected java.lang.String	name
protected Flags	permanentFlags
protected com.sun.mail.imap.protocol.IMAPProtocol	protocol
protected char	separator
protected int	type
protected java.util.Hashtable	uidTable
protected static char	UNKNOWN_SEPARATOR

Fields inherited from class javax.mail.Folder

HOLDS_FOLDERS, HOLDS_MESSAGES, mode, READ_ONLY, READ_WRITE, store

Fields inherited from interface javax.mail.UIDFolder

LASTUID

Constructor Summary

protected	IMAPFolder(com.sun.mail.imap.protocol.ListInfo li, IMAPStore store) Constructor used to create an existing folder.
protected	IMAPFolder(java.lang.String fullName, char separator, IMAPStore store) Constructor used to create a possibly non-existent folder.

Method Summary

void	addACL(ACL acl) Add an access control list entry to the access control list for this folder.
void	addRights(ACL acl) Add the rights specified in the ACL to the entry for the identifier specified in the ACL.
void	appendMessages(Message[] msgs) Append the given messages into this folder.
void	close(boolean expunge) Close this folder.
void	copyMessages(Message[] msgs, Folder folder) Copy the specified messages from this folder, to the specified destination.
boolean	create(int type) Create this folder, with the specified type.
boolean	delete(boolean recurse) Delete this folder.
java.lang.Object	doCommand(IMAPFolder.ProtocolCommand cmd) Execute a user-supplied IMAP command.
boolean	exists() Check whether this folder really exists on the server.
Message[]	expunge() Expunge.
void	fetch(Message[] msgs, FetchProfile fp) Prefetch attributes, based on the given FetchProfile.
ACL[]	getACL() Get the access control list entries for this folder.
int	getDeletedMessageCount() Get the deleted message count.
Folder	getFolder(java.lang.String name) Get the named subfolder.
java.lang.String	getFullName() Get the fullname of this folder.
Message	getMessage(int msgnum) Get the specified message.
Message	getMessageByUID(long uid) Get the Message corresponding to the given UID.
int	getMessageCount() Get the total message count.
Message[]	getMessagesByUID(long[] uids) Get the Messages specified by the given array.
Message[]	getMessagesByUID(long start, long end) Get the Messages specified by the given range.
java.lang.String	getName() Get the name of this folder.
int	getNewMessageCount() Get the new message count.
Folder	getParent() Get this folder's parent.
Flags	getPermanentFlags() Return the permanent flags supported by the server.
com.sun.mail.imap.protocol.IMAPProtocol	getProtocol() Return the IMAPProtocol object for this folder.
Quota[]	getQuota() Get the quotas for the quotaroot associated with this folder.
char	getSeparator() Get the separator character.
protected com.sun.mail.imap.protocol.IMAPProtocol	getStoreProtocol() Get this folder's Store's protocol connection.
int	getType() Get the type of this folder.
long	getUID(Message message) Get the UID for the specified message.
long	getUIDValidity() Returns the UIDValidity for this folder
int	getUnreadMessageCount() Get the unread message count.
void	handleResponse(com.sun.mail.iap.Response r) The response handler.
boolean	hasNewMessages() Check whether this folder has new messages.
boolean	isOpen() Check whether this connection is really open.
boolean	isSubscribed() Check whether this folder is subscribed.
Folder[]	list(java.lang.String pattern) List all subfolders matching the specified pattern.
Rights[]	listRights(java.lang.String name) Get all the rights that may be allowed to the given identifier.
Folder[]	listSubscribed(java.lang.String pattern) List all subscribed subfolders matching the specified pattern.
protected java.lang.Object	lockFor(com.sun.mail.imap.protocol.IMAPProtocol p) Return a lock for the protocol object.
Rights	myRights() Get the rights allowed to the currently authenticated user.
void	open(int mode) Open this folder in the given mode.
protected void	releaseStoreProtocol(com.sun.mail.imap.protocol.IMAPProtocol p) Release the store protocol object.
void	removeACL(java.lang.String name) Remove any access control list entry for the given identifier from the access control list for this folder.
void	removeRights(ACL acl) Remove the rights specified in the ACL from the entry for the identifier specified in the ACL.
boolean	renameTo(Folder f) Rename this folder.
Message[]	search(SearchTerm term) Search whole folder for messages matching the given term.
Message[]	search(SearchTerm term, Message[] msgs) Search the folder for messages matching the given term.
void	setFlags(Message[] msgs, Flags flag, boolean value) Set the specified flags for the given array of messages.
void	setQuota(Quota quota) Set the quotas for the quotaroot specified in the quota argument.
void	setSubscribed(boolean subscribe) Subscribe/Unsubscribe this folder.

Methods inherited from class javax.mail.Folder

addConnectionListener, addFolderListener, addMessageChangedListener, addMessageCountListener, finalize, getMessages, getMessages, getMessages, getMode, getStore, getURLName, list, listSubscribed, notifyConnectionListeners, notifyFolderListeners, notifyFolderRenamedListeners, notifyMessageAddedListeners, notifyMessageChangedListeners, notifyMessageRemovedListeners, removeConnectionListener, removeFolderListener, removeMessageChangedListener, removeMessageCountListener, setFlags, setFlags, toString

Methods inherited from class java.lang.Object

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

Field Detail

fullName

protected java.lang.String fullName

name

protected java.lang.String name

type

protected int type

separator

protected char separator

availableFlags

protected Flags availableFlags

permanentFlags

protected Flags permanentFlags

exists

protected boolean exists

protocol

protected com.sun.mail.imap.protocol.IMAPProtocol protocol

messageCache

protected java.util.Vector messageCache

messageCacheLock

protected java.lang.Object messageCacheLock

uidTable

protected java.util.Hashtable uidTable

UNKNOWN_SEPARATOR

protected static final char UNKNOWN_SEPARATOR

Constructor Detail

IMAPFolder

protected IMAPFolder(java.lang.String fullName,
                     char separator,
                     IMAPStore store)

Constructor used to create a possibly non-existent folder.

Parameters:

fullName - fullname of this folder

separator - the default separator character for this folder's namespace

store - the Store

IMAPFolder

protected IMAPFolder(com.sun.mail.imap.protocol.ListInfo li,
                     IMAPStore store)

Constructor used to create an existing folder.

Method Detail

getName

public java.lang.String getName()

Get the name of this folder.

Overrides:

getName in class Folder

Following copied from class: javax.mail.Folder

Returns:

name of the Folder

getFullName

public java.lang.String getFullName()

Get the fullname of this folder.

Overrides:

getFullName in class Folder

Following copied from class: javax.mail.Folder

Returns:

full name of the Folder

getParent

public Folder getParent()
                 throws MessagingException

Get this folder's parent.

Overrides:

getParent in class Folder

Following copied from class: javax.mail.Folder

Returns:

Parent folder

exists

public boolean exists()
               throws MessagingException

Check whether this folder really exists on the server.

Overrides:

exists in class Folder

Following copied from class: javax.mail.Folder

Returns:

true if the folder exists, otherwise false

Throws:

MessagingException - typically if the connection to the server is lost.

See Also:

Folder.create(int)

list

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

List all subfolders matching the specified pattern.

Overrides:

list in class Folder

Following copied from class: javax.mail.Folder

Parameters:

pattern - the match pattern

Returns:

array of matching Folder objects. An empty array is returned if no matching Folders exist.

Throws:

FolderNotFoundException - if this folder does not exist.

MessagingException -

See Also:

Folder.listSubscribed(java.lang.String)

listSubscribed

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

List all subscribed subfolders matching the specified pattern.

Overrides:

listSubscribed in class Folder

Following copied from class: javax.mail.Folder

Parameters:

pattern - the match pattern

Returns:

array of matching subscribed Folder objects. An empty array is returned of no matching subscribed folders exist.

Throws:

FolderNotFoundException - if this folder does not exist.

MessagingException -

See Also:

Folder.list(java.lang.String)

getSeparator

public char getSeparator()
                  throws MessagingException

Get the separator character.

Overrides:

getSeparator in class Folder

Following copied from class: javax.mail.Folder

Returns:

Hierarchy separator character

Throws:

FolderNotFoundException - if this folder does not exist

getType

public int getType()
            throws MessagingException

Get the type of this folder.

Overrides:

getType in class Folder

Following copied from class: javax.mail.Folder

Returns:

integer with appropriate bits set

Throws:

FolderNotFoundException - if this folder does not exist.

See Also:

Folder.HOLDS_FOLDERS, Folder.HOLDS_MESSAGES

isSubscribed

public boolean isSubscribed()

Check whether this folder is subscribed.

Overrides:

isSubscribed in class Folder

Following copied from class: javax.mail.Folder

Returns:

true if this Folder is subscribed

setSubscribed

public void setSubscribed(boolean subscribe)
                   throws MessagingException

Subscribe/Unsubscribe this folder.

Overrides:

setSubscribed in class Folder

Following copied from class: javax.mail.Folder

Parameters:

subscribe - true to subscribe, false to unsubscribe

Throws:

FolderNotFoundException - if this folder does not exist.

MethodNotSupportedException - if this store does not support subscription

MessagingException -

create

public boolean create(int type)
               throws MessagingException

Create this folder, with the specified type.

Overrides:

create in class Folder

Following copied from class: javax.mail.Folder

Parameters:

type - The type of this folder.

Returns:

true if the creation succeeds, else false.

Throws:

MessagingException -

See Also:

Folder.HOLDS_FOLDERS, Folder.HOLDS_MESSAGES, FolderEvent

hasNewMessages

public boolean hasNewMessages()
                       throws MessagingException

Check whether this folder has new messages.

Overrides:

hasNewMessages in class Folder

Following copied from class: javax.mail.Folder

Returns:

true if the Store has new Messages

Throws:

FolderNotFoundException - if this folder does not exist.

MessagingException -

getFolder

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

Get the named subfolder.

Overrides:

getFolder in class Folder

Following copied from class: javax.mail.Folder

Parameters:

name - name of the Folder

Returns:

Folder object

Throws:

MessagingException -

delete

public boolean delete(boolean recurse)
               throws MessagingException

Delete this folder.

Overrides:

delete in class Folder

Following copied from class: javax.mail.Folder

Returns:

true if the Folder is deleted successfully

Throws:

FolderNotFoundException - if this folder does not exist

IllegalStateException - if this folder is not in the closed state.

MessagingException -

See Also:

FolderEvent

renameTo

public boolean renameTo(Folder f)
                 throws MessagingException

Rename this folder.

Overrides:

renameTo in class Folder

Following copied from class: javax.mail.Folder

Parameters:

f - a folder representing the new name for this Folder

Returns:

true if the Folder is renamed successfully

Throws:

FolderNotFoundException - if this folder does not exist

IllegalStateException - if this folder is not in the closed state.

MessagingException -

See Also:

FolderEvent

open

public void open(int mode)
          throws MessagingException

Open this folder in the given mode.

Overrides:

open in class Folder

Following copied from class: javax.mail.Folder

Parameters:

mode - open the Folder READ_ONLY or READ_WRITE

Throws:

FolderNotFoundException - if this folder does not exist.

IllegalStateException - if this folder is not in the closed state.

MessagingException -

See Also:

Folder.READ_ONLY, Folder.READ_WRITE, Folder.getType(), ConnectionEvent

fetch

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

Prefetch attributes, based on the given FetchProfile.

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. -

setFlags

public void setFlags(Message[] msgs,
                     Flags flag,
                     boolean value)
              throws MessagingException

Set the specified flags for the given array of messages.

Overrides:

setFlags in class Folder

Following copied from class: javax.mail.Folder

Parameters:

msgnums - the array of message objects

flag - Flags object containing the flags to be set

value - set the flags to this boolean value

Throws:

IllegalStateException - if this folder is not opened or if it has been opened READ_ONLY.

MessagingException -

See Also:

Message.setFlags(javax.mail.Flags, boolean), MessageChangedEvent

close

public void close(boolean expunge)
           throws MessagingException

Close this folder.

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()

Check whether this connection is really open.

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()

Return the permanent flags supported by the server.

Overrides:

getPermanentFlags in class Folder

Following copied from class: javax.mail.Folder

Returns:

permanent flags, or null if not known

getMessageCount

public int getMessageCount()
                    throws MessagingException

Get the total message count.

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 -

getNewMessageCount

public int getNewMessageCount()
                       throws MessagingException

Get the new message count.

Overrides:

getNewMessageCount in class Folder

Following copied from class: javax.mail.Folder

Returns:

number of new 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 -

getUnreadMessageCount

public int getUnreadMessageCount()
                          throws MessagingException

Get the unread message count.

Overrides:

getUnreadMessageCount in class Folder

Following copied from class: javax.mail.Folder

Returns:

total number of unread 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 -

getDeletedMessageCount

public int getDeletedMessageCount()
                           throws MessagingException

Get the deleted message count.

Overrides:

getDeletedMessageCount in class Folder

Following copied from class: javax.mail.Folder

Returns:

number of deleted 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 msgnum)
                   throws MessagingException

Get the specified message.

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)

appendMessages

public void appendMessages(Message[] msgs)
                    throws MessagingException

Append the given messages into this folder.

Overrides:

appendMessages in class Folder

Following copied from class: javax.mail.Folder

Parameters:

msgs - array of Messages to be appended

Throws:

FolderNotFoundException - if this folder does not exist.

MessagingException - if the append failed.

copyMessages

public void copyMessages(Message[] msgs,
                         Folder folder)
                  throws MessagingException

Copy the specified messages from this folder, to the specified destination.

Overrides:

copyMessages in class Folder

Following copied from class: javax.mail.Folder

Parameters:

msgnums - the array of message objects

folder - the folder to copy the messages to

Throws:

FolderNotFoundException - if the destination folder does not exist.

IllegalStateException - if this folder is not opened.

MessagingException -

See Also:

Folder.appendMessages(javax.mail.Message[])

expunge

public Message[] expunge()
                  throws MessagingException

Expunge.

Overrides:

expunge in class Folder

Following copied from class: javax.mail.Folder

Returns:

array of expunged Message objects

Throws:

FolderNotFoundException - if this folder does not exist

IllegalStateException - if this folder is not opened.

MessagingException -

See Also:

Message.isExpunged(), MessageCountEvent

search

public Message[] search(SearchTerm term)
                 throws MessagingException

Search whole folder for messages matching the given term.

Overrides:

search in class Folder

Following copied from class: javax.mail.Folder

Parameters:

term - the search criterion

Returns:

array of matching messages

Throws:

SearchException - if the search term is too complex for the implementation to handle.

FolderNotFoundException - if this folder does not exist.

IllegalStateException - if this folder is not opened.

MessagingException -

See Also:

SearchTerm

search

public Message[] search(SearchTerm term,
                        Message[] msgs)
                 throws MessagingException

Search the folder for messages matching the given term. Returns array of matching messages. Returns an empty array if no matching messages are found.

Overrides:

search in class Folder

Following copied from class: javax.mail.Folder

Parameters:

term - the search criterion

msgs - the messages to be searched

Returns:

array of matching messages

Throws:

SearchException - if the search term is too complex for the implementation to handle.

IllegalStateException - if this folder is not opened

MessagingException -

See Also:

SearchTerm

getUIDValidity

public long getUIDValidity()
                    throws MessagingException

Returns the UIDValidity for this folder

Specified by:

getUIDValidity in interface UIDFolder

Following copied from interface: javax.mail.UIDFolder

Returns:

UIDValidity

getMessageByUID

public Message getMessageByUID(long uid)
                        throws MessagingException

Get the Message corresponding to the given UID. If no such message exists, null is returned.

Specified by:

getMessageByUID in interface UIDFolder

Following copied from interface: javax.mail.UIDFolder

Parameters:

uid - UID for the desired message

Returns:

the Message object. null is returned if no message corresponding to this UID is obtained.

Throws:

MessagingException -

getMessagesByUID

public Message[] getMessagesByUID(long start,
                                  long end)
                           throws MessagingException

Get the Messages specified by the given range.

Returns Message objects for all valid messages in this range. Returns an empty array if no messages are found.

Specified by:

getMessagesByUID in interface UIDFolder

Following copied from interface: javax.mail.UIDFolder

Parameters:

start - start UID

end - end UID

Returns:

array of Message objects

Throws:

MessagingException -

See Also:

UIDFolder.LASTUID

getMessagesByUID

public Message[] getMessagesByUID(long[] uids)
                           throws MessagingException

Get the Messages specified by the given array.

uids.length() elements are returned. If any UID in the array is invalid, a null entry is returned for that element.

Specified by:

getMessagesByUID in interface UIDFolder

Following copied from interface: javax.mail.UIDFolder

Parameters:

uids - array of UIDs

Returns:

array of Message objects

Throws:

MessagingException -

getUID

public long getUID(Message message)
            throws MessagingException

Get the UID for the specified message.

Specified by:

getUID in interface UIDFolder

Following copied from interface: javax.mail.UIDFolder

Parameters:

message - Message from this folder

Returns:

UID for this message

Throws:

java.util.NoSuchElementException - if the given Message is not in this Folder.

getQuota

public Quota[] getQuota()
                 throws MessagingException

Get the quotas for the quotaroot associated with this folder. Note that many folders may have the same quotaroot. Quotas are controlled on the basis of a quotaroot, not (necessarily) a folder. The relationship between folders and quotaroots depends on the IMAP server. Some servers might implement a single quotaroot for all folders owned by a user. Other servers might implement a separate quotaroot for each folder. A single folder can even have multiple quotaroots, perhaps controlling quotas for different resources.

Returns:

array of Quota objects for the quotaroots associated with this folder

Throws:

MessagingException - if the server doesn't support the QUOTA extension

setQuota

public void setQuota(Quota quota)
              throws MessagingException

Set the quotas for the quotaroot specified in the quota argument. Typically this will be one of the quotaroots associated with this folder, as obtained from the getQuota method, but it need not be.

Parameters:

quota - the quota to set

Throws:

MessagingException - if the server doesn't support the QUOTA extension

getACL

public ACL[] getACL()
             throws MessagingException

Get the access control list entries for this folder.

Returns:

array of access control list entries

Throws:

MessagingException - if the server doesn't support the ACL extension

addACL

public void addACL(ACL acl)
            throws MessagingException

Add an access control list entry to the access control list for this folder.

Parameters:

acl - the access control list entry to add

Throws:

MessagingException - if the server doesn't support the ACL extension

removeACL

public void removeACL(java.lang.String name)
               throws MessagingException

Remove any access control list entry for the given identifier from the access control list for this folder.

Parameters:

name - the identifier for which to remove all ACL entries

Throws:

MessagingException - if the server doesn't support the ACL extension

addRights

public void addRights(ACL acl)
               throws MessagingException

Add the rights specified in the ACL to the entry for the identifier specified in the ACL. If an entry for the identifier doesn't already exist, add one.

Parameters:

acl - the identifer and rights to add

Throws:

MessagingException - if the server doesn't support the ACL extension

removeRights

public void removeRights(ACL acl)
                  throws MessagingException

Remove the rights specified in the ACL from the entry for the identifier specified in the ACL.

Parameters:

acl - the identifer and rights to remove

Throws:

MessagingException - if the server doesn't support the ACL extension

listRights

public Rights[] listRights(java.lang.String name)
                    throws MessagingException

Get all the rights that may be allowed to the given identifier. Rights are grouped per RFC 2086 and each group is returned as an element of the array. The first element of the array is the set of rights that are always granted to the identifier. Later elements are rights that may be optionally granted to the identifier.

Note that this method lists the rights that it is possible to assign to the given identifier, not the rights that are actually granted to the given identifier. For the latter, see the getACL method.

Parameters:

name - the identifier to list rights for

Returns:

array of Rights objects representing possible rights for the identifier

Throws:

MessagingException - if the server doesn't support the ACL extension

myRights

public Rights myRights()
                throws MessagingException

Get the rights allowed to the currently authenticated user.

Returns:

the rights granted to the current user

Throws:

MessagingException - if the server doesn't support the ACL extension

handleResponse

public void handleResponse(com.sun.mail.iap.Response r)

The response handler. This is the callback routine that is invoked by the protocol layer.

Specified by:

handleResponse in interface com.sun.mail.iap.ResponseHandler

getStoreProtocol

protected com.sun.mail.imap.protocol.IMAPProtocol getStoreProtocol()
                                                            throws com.sun.mail.iap.ProtocolException

Get this folder's Store's protocol connection. When acquiring a store protocol object, it is important to use the following steps: IMAPProtocol p = null; try { p = getStoreProtocol(); synchronized lockFor(p) { // perform the command } } catch (WhateverException ex) { // handle it } finally { releaseStoreProtocol(p); }

getProtocol

public com.sun.mail.imap.protocol.IMAPProtocol getProtocol()

Return the IMAPProtocol object for this folder.

NOTE: This method was intended to allow experimentation with simple extension commands that can use the low level Protocol object APIs to send commands and process responses.

NOTE: Using this protocol object is completely UNSAFE because there's no way to aquire the required locks. See the doCommand method for a safe alternative.

Returns:

the IMAPProtocol object used when the folder is open

See Also:

doCommand(com.sun.mail.imap.IMAPFolder.ProtocolCommand)

doCommand

public java.lang.Object doCommand(IMAPFolder.ProtocolCommand cmd)
                           throws MessagingException

Execute a user-supplied IMAP command. The command is executed in the appropriate context with the necessary locks held and using the appropriate IMAPProtocol object.

This method returns whatever the ProtocolCommand object's doCommand method returns. If the doCommand method throws a ConnectionException it is translated into a StoreClosedException or FolderClosedException as appropriate. If the doCommand method throws a ProtocolException it is translated into a MessagingException.

The following example shows how to execute the IMAP NOOP command. Executing more complex IMAP commands requires intimate knowledge of the com.sun.mail.iap and com.sun.mail.imap.protocol packages, best acquired by reading the source code.

 import com.sun.mail.iap.*;
 import com.sun.mail.imap.*;
 import com.sun.mail.imap.protocol.*;

 ...

 IMAPFolder f = (IMAPFolder)folder;
 Object val = f.doCommand(new IMAPFolder.ProtocolCommand() {
	public Object doCommand(IMAPProtocol p)
			throws ProtocolException {
	    p.simpleCommand("NOOP", null);
	    return null;
	}
 });
 

Here's a more complex example showing how to use the proposed IMAP SORT extension:

 import com.sun.mail.iap.*;
 import com.sun.mail.imap.*;
 import com.sun.mail.imap.protocol.*;

 ...

 IMAPFolder f = (IMAPFolder)folder;
 Object val = f.doCommand(new IMAPFolder.ProtocolCommand() {
	public Object doCommand(IMAPProtocol p)
			throws ProtocolException {
	    // Issue command
	    Argument args = new Argument();
	    Argument list = new Argument();
	    list.writeString("SUBJECT");
	    args.writeArgument(list);
	    args.writeString("UTF-8");
	    args.writeString("ALL");
	    Response[] r = p.command("SORT", args);
	    Response response = r[r.length-1];

	    // Grab response
	    Vector v = new Vector();
	    if (response.isOK()) { // command succesful 
		for (int i = 0, len = r.length; i < len; i++) {
		    if (!(r[i] instanceof IMAPResponse))
			continue;

		    IMAPResponse ir = (IMAPResponse)r[i];
		    if (ir.keyEquals("SORT")) {
			String num;
			while ((num = ir.readAtomString()) != null)
			    System.out.println(num);
			r[i] = null;
		    }
		}
	    }

	    // dispatch remaining untagged responses
	    p.notifyResponseHandlers(r);
	    p.handleResult(response);

	    return null;
	}
 });
 

lockFor

protected java.lang.Object lockFor(com.sun.mail.imap.protocol.IMAPProtocol p)

Return a lock for the protocol object.

When using this folder's protocol object, we have to lock the messageCacheLock, as described at the top. When using a borrowed store protocol we don't have to lock anything so we take advantage of the fact that locking a brand new object is effectively a no-op. This allows the code that conditionally chooses different protocol objects to do conditional locking in a simple way.

releaseStoreProtocol

protected void releaseStoreProtocol(com.sun.mail.imap.protocol.IMAPProtocol p)

Release the store protocol object. If we borrowed a protocol object from the connection pool, give it back. If we used our own protocol object, nothing to do.