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package javax.mail;
import java.util.NoSuchElementException;
/**
* The UIDFolder interface is implemented by Folders
* that can support the "disconnected" mode of operation, by providing
* unique-ids for messages in the folder. This interface is based on
* the IMAP model for supporting disconnected operation.
*
* A Unique identifier (UID) is a positive long value, assigned to
* each message in a specific folder. Unique identifiers are assigned
* in a strictly ascending fashion in the mailbox.
* That is, as each message is added to the mailbox it is assigned a
* higher UID than the message(s) which were added previously. Unique
* identifiers persist across sessions. This permits a client to
* resynchronize its state from a previous session with the server.
*
* Associated with every mailbox is a unique identifier validity value.
* If unique identifiers from an earlier session fail to persist to
* this session, the unique identifier validity value
* must be greater than the one used in the earlier
* session.
*
* Refer to RFC 2060
* for more information.
*
* All the Folder objects returned by the default IMAP provider implement
* the UIDFolder interface. Use it as follows:
*
*
* Folder f = store.getFolder("whatever");
* UIDFolder uf = (UIDFolder)f;
* long uid = uf.getUID(msg);
*
*
*
* @author Bill Shannon
* @author John Mani
*/
public interface UIDFolder {
/**
* A fetch profile item for fetching UIDs.
* This inner class extends the FetchProfile.Item
* class to add new FetchProfile item types, specific to UIDFolders.
* The only item currently defined here is the UID item.
*
* @see FetchProfile
*/
public static class FetchProfileItem extends FetchProfile.Item {
protected FetchProfileItem(String name) {
super(name);
}
/**
* UID is a fetch profile item that can be included in a
* FetchProfile during a fetch request to a Folder.
* This item indicates that the UIDs for messages in the specified
* range are desired to be prefetched.
*
* An example of how a client uses this is below:
*
*
* FetchProfile fp = new FetchProfile();
* fp.add(UIDFolder.FetchProfileItem.UID);
* folder.fetch(msgs, fp);
*
*
*/
public static final FetchProfileItem UID =
new FetchProfileItem("UID");
}
/**
* This is a special value that can be used as the end
* parameter in getMessagesByUID(start, end), to denote the
* UID of the last message in the folder.
*
* @see #getMessagesByUID
*/
public static final long LASTUID = -1;
/**
* The largest value possible for a UID, a 32-bit unsigned integer.
* This can be used to fetch all new messages by keeping track of the
* last UID that was seen and using:
*
*
* Folder f = store.getFolder("whatever");
* UIDFolder uf = (UIDFolder)f;
* Message[] newMsgs =
* uf.getMessagesByUID(lastSeenUID + 1, UIDFolder.MAXUID);
*
*
*
* @since JavaMail 1.6
*/
public static final long MAXUID = 0xffffffffL; // max 32-bit unsigned int
/**
* Returns the UIDValidity value associated with this folder.
*
* Clients typically compare this value against a UIDValidity
* value saved from a previous session to insure that any cached
* UIDs are not stale.
*
* @return UIDValidity
* @exception MessagingException for failures
*/
public long getUIDValidity() throws MessagingException;
/**
* Get the Message corresponding to the given UID. If no such
* message exists, null is returned.
*
* @param uid UID for the desired message
* @return the Message object. null is returned
* if no message corresponding to this UID is obtained.
* @exception MessagingException for failures
*/
public Message getMessageByUID(long uid) throws MessagingException;
/**
* Get the Messages specified by the given range. The special
* value LASTUID can be used for the end parameter
* to indicate the UID of the last message in the folder.
*
* Note that end need not be greater than start;
* the order of the range doesn't matter.
* Note also that, unless the folder is empty, use of LASTUID ensures
* that at least one message will be returned - the last message in the
* folder.
*
* @param start start UID
* @param end end UID
* @return array of Message objects
* @exception MessagingException for failures
* @see #LASTUID
*/
public Message[] getMessagesByUID(long start, long end)
throws MessagingException;
/**
* Get the Messages specified by the given array of UIDs. If any UID is
* invalid, null is returned for that entry.
*
* Note that the returned array will be of the same size as the specified
* array of UIDs, and null entries may be present in the
* array to indicate invalid UIDs.
*
* @param uids array of UIDs
* @return array of Message objects
* @exception MessagingException for failures
*/
public Message[] getMessagesByUID(long[] uids)
throws MessagingException;
/**
* Get the UID for the specified message. Note that the message
* must belong to this folder. Otherwise
* java.util.NoSuchElementException is thrown.
*
* @param message Message from this folder
* @return UID for this message
* @exception NoSuchElementException if the given Message
* is not in this Folder.
* @exception MessagingException for other failures
*/
public long getUID(Message message) throws MessagingException;
/**
* Returns the predicted UID that will be assigned to the
* next message that is appended to this folder.
* Messages might be appended to the folder after this value
* is retrieved, causing this value to be out of date.
* This value might only be updated when a folder is first opened.
* Note that messages may have been appended to the folder
* while it was open and thus this value may be out of
* date.
*
* If the value is unknown, -1 is returned.
*
* @return the UIDNEXT value, or -1 if unknown
* @exception MessagingException for failures
* @since JavaMail 1.6
*/
public long getUIDNext() throws MessagingException;
}