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package javax.mail;
import java.io.*;
import java.net.*;
import java.util.*;
import javax.mail.event.*;
/**
* An abstract class that models a message store and its
* access protocol, for storing and retrieving messages.
* Subclasses provide actual implementations. <p>
*
* Note that <code>Store</code> extends the <code>Service</code>
* class, which provides many common methods for naming stores,
* connecting to stores, and listening to connection events.
*
* @author John Mani
* @author Bill Shannon
*
* @see javax.mail.Service
* @see javax.mail.event.ConnectionEvent
* @see javax.mail.event.StoreEvent
*/
public abstract class Store extends Service {
/**
* Constructor.
*
* @param session Session object for this Store.
* @param urlname URLName object to be used for this Store
*/
protected Store(Session session, URLName urlname) {
super(session, urlname);
}
/**
* Returns a Folder object that represents the 'root' of
* the default namespace presented to the user by the Store.
*
* @return the root Folder
* @exception IllegalStateException if this Store is not connected.
* @exception MessagingException for other failures
*/
public abstract Folder getDefaultFolder() throws MessagingException;
/**
* Return the Folder object corresponding to the given name. Note
* that a Folder object is returned even if the named folder does
* not physically exist on the Store. The <code>exists()</code>
* method on the folder object indicates whether this folder really
* exists. <p>
*
* Folder objects are not cached by the Store, so invoking this
* method on the same name multiple times will return that many
* distinct Folder objects.
*
* @param name The name of the Folder. In some Stores, name can
* be an absolute path if it starts with the
* hierarchy delimiter. Else it is interpreted
* relative to the 'root' of this namespace.
* @return Folder object
* @exception IllegalStateException if this Store is not connected.
* @exception MessagingException for other failures
* @see Folder#exists
* @see Folder#create
*/
public abstract Folder getFolder(String name)
throws MessagingException;
/**
* Return a closed Folder object, corresponding to the given
* URLName. The store specified in the given URLName should
* refer to this Store object. <p>
*
* Implementations of this method may obtain the name of the
* actual folder using the <code>getFile()</code> method on
* URLName, and use that name to create the folder.
*
* @param url URLName that denotes a folder
* @return Folder object
* @exception IllegalStateException if this Store is not connected.
* @exception MessagingException for other failures
* @see URLName
*/
public abstract Folder getFolder(URLName url)
throws MessagingException;
/**
* Return a set of folders representing the <i>personal</i> namespaces
* for the current user. A personal namespace is a set of names that
* is considered within the personal scope of the authenticated user.
* Typically, only the authenticated user has access to mail folders
* in their personal namespace. If an INBOX exists for a user, it
* must appear within the user's personal namespace. In the
* typical case, there should be only one personal namespace for each
* user in each Store. <p>
*
* This implementation returns an array with a single entry containing
* the return value of the <code>getDefaultFolder</code> method.
* Subclasses should override this method to return appropriate information.
*
* @return array of Folder objects
* @exception IllegalStateException if this Store is not connected.
* @exception MessagingException for other failures
* @since JavaMail 1.2
*/
public Folder[] getPersonalNamespaces() throws MessagingException {
return new Folder[] { getDefaultFolder() };
}
/**
* Return a set of folders representing the namespaces for
* <code>user</code>. The namespaces returned represent the
* personal namespaces for the user. To access mail folders in the
* other user's namespace, the currently authenticated user must be
* explicitly granted access rights. For example, it is common for
* a manager to grant to their secretary access rights to their
* mail folders. <p>
*
* This implementation returns an empty array. Subclasses should
* override this method to return appropriate information.
*
* @param user the user name
* @return array of Folder objects
* @exception IllegalStateException if this Store is not connected.
* @exception MessagingException for other failures
* @since JavaMail 1.2
*/
public Folder[] getUserNamespaces(String user)
throws MessagingException {
return new Folder[0];
}
/**
* Return a set of folders representing the <i>shared</i> namespaces.
* A shared namespace is a namespace that consists of mail folders
* that are intended to be shared amongst users and do not exist
* within a user's personal namespace. <p>
*
* This implementation returns an empty array. Subclasses should
* override this method to return appropriate information.
*
* @exception IllegalStateException if this Store is not connected.
* @exception MessagingException for other failures
* @return array of Folder objects
* @since JavaMail 1.2
*/
public Folder[] getSharedNamespaces() throws MessagingException {
return new Folder[0];
}
// Vector of Store listeners
private volatile Vector storeListeners = null;
/**
* Add a listener for StoreEvents on this Store. <p>
*
* The default implementation provided here adds this listener
* to an internal list of StoreListeners.
*
* @param l the Listener for Store events
* @see javax.mail.event.StoreEvent
*/
public synchronized void addStoreListener(StoreListener l) {
if (storeListeners == null)
storeListeners = new Vector();
storeListeners.addElement(l);
}
/**
* Remove a listener for Store events. <p>
*
* The default implementation provided here removes this listener
* from the internal list of StoreListeners.
*
* @param l the listener
* @see #addStoreListener
*/
public synchronized void removeStoreListener(StoreListener l) {
if (storeListeners != null)
storeListeners.removeElement(l);
}
/**
* Notify all StoreListeners. Store implementations are
* expected to use this method to broadcast StoreEvents. <p>
*
* The provided default implementation queues the event into
* an internal event queue. An event dispatcher thread dequeues
* events from the queue and dispatches them to the registered
* StoreListeners. Note that the event dispatching occurs
* in a separate thread, thus avoiding potential deadlock problems.
*
* @param type the StoreEvent type
* @param message a message for the StoreEvent
*/
protected void notifyStoreListeners(int type, String message) {
if (storeListeners == null)
return;
StoreEvent e = new StoreEvent(this, type, message);
queueEvent(e, storeListeners);
}
// Vector of folder listeners
private volatile Vector folderListeners = null;
/**
* Add a listener for Folder events on any Folder object
* obtained from this Store. FolderEvents are delivered to
* FolderListeners on the affected Folder as well as to
* FolderListeners on the containing Store. <p>
*
* The default implementation provided here adds this listener
* to an internal list of FolderListeners.
*
* @param l the Listener for Folder events
* @see javax.mail.event.FolderEvent
*/
public synchronized void addFolderListener(FolderListener l) {
if (folderListeners == null)
folderListeners = new Vector();
folderListeners.addElement(l);
}
/**
* Remove a listener for Folder events. <p>
*
* The default implementation provided here removes this listener
* from the internal list of FolderListeners.
*
* @param l the listener
* @see #addFolderListener
*/
public synchronized void removeFolderListener(FolderListener l) {
if (folderListeners != null)
folderListeners.removeElement(l);
}
/**
* Notify all FolderListeners. Store implementations are
* expected to use this method to broadcast Folder events. <p>
*
* The provided default implementation queues the event into
* an internal event queue. An event dispatcher thread dequeues
* events from the queue and dispatches them to the registered
* FolderListeners. Note that the event dispatching occurs
* in a separate thread, thus avoiding potential deadlock problems.
*
* @param type type of FolderEvent
* @param folder affected Folder
* @see #notifyFolderRenamedListeners
*/
protected void notifyFolderListeners(int type, Folder folder) {
if (folderListeners == null)
return;
FolderEvent e = new FolderEvent(this, folder, type);
queueEvent(e, folderListeners);
}
/**
* Notify all FolderListeners about the renaming of a folder.
* Store implementations are expected to use this method to broadcast
* Folder events indicating the renaming of folders. <p>
*
* The provided default implementation queues the event into
* an internal event queue. An event dispatcher thread dequeues
* events from the queue and dispatches them to the registered
* FolderListeners. Note that the event dispatching occurs
* in a separate thread, thus avoiding potential deadlock problems.
*
* @param oldF the folder being renamed
* @param newF the folder representing the new name.
* @since JavaMail 1.1
*/
protected void notifyFolderRenamedListeners(Folder oldF, Folder newF) {
if (folderListeners == null)
return;
FolderEvent e = new FolderEvent(this, oldF, newF,FolderEvent.RENAMED);
queueEvent(e, folderListeners);
}
}