javax.mail.event.MessageCountEvent Maven / Gradle / Ivy
/*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
*
* Copyright (c) 1997-2010 Oracle and/or its affiliates. All rights reserved.
*
* The contents of this file are subject to the terms of either the GNU
* General Public License Version 2 only ("GPL") or the Common Development
* and Distribution License("CDDL") (collectively, the "License"). You
* may not use this file except in compliance with the License. You can
* obtain a copy of the License at
* https://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
* or packager/legal/LICENSE.txt. See the License for the specific
* language governing permissions and limitations under the License.
*
* When distributing the software, include this License Header Notice in each
* file and include the License file at packager/legal/LICENSE.txt.
*
* GPL Classpath Exception:
* Oracle designates this particular file as subject to the "Classpath"
* exception as provided by Oracle in the GPL Version 2 section of the License
* file that accompanied this code.
*
* Modifications:
* If applicable, add the following below the License Header, with the fields
* enclosed by brackets [] replaced by your own identifying information:
* "Portions Copyright [year] [name of copyright owner]"
*
* Contributor(s):
* If you wish your version of this file to be governed by only the CDDL or
* only the GPL Version 2, indicate your decision by adding "[Contributor]
* elects to include this software in this distribution under the [CDDL or GPL
* Version 2] license." If you don't indicate a single choice of license, a
* recipient has the option to distribute your version of this file under
* either the CDDL, the GPL Version 2 or to extend the choice of license to
* its licensees as provided above. However, if you add GPL Version 2 code
* and therefore, elected the GPL Version 2 license, then the option applies
* only if the new code is made subject to such option by the copyright
* holder.
*/
package javax.mail.event;
import java.util.*;
import javax.mail.*;
/**
* This class notifies changes in the number of messages in a folder.
*
* Note that some folder types may only deliver MessageCountEvents at
* certain times or after certain operations. IMAP in particular will
* only notify the client of MessageCountEvents when a client issues a
* new command.
* Refer to RFC 2060
* http://www.ietf.org/rfc/rfc2060.txt for details.
* A client may want "poll" the folder by occasionally calling the
* getMessageCount or isConnected methods
* to solicit any such notifications.
*
* @author John Mani
*/
public class MessageCountEvent extends MailEvent {
/** The messages were added to their folder */
public static final int ADDED = 1;
/** The messages were removed from their folder */
public static final int REMOVED = 2;
/**
* The event type.
*
* @serial
*/
protected int type;
/**
* If true, this event is the result of an explicit
* expunge by this client, and the messages in this
* folder have been renumbered to account for this.
* If false, this event is the result of an expunge
* by external sources.
*
* @serial
*/
protected boolean removed;
/**
* The messages.
*/
transient protected Message[] msgs;
private static final long serialVersionUID = -7447022340837897369L;
/**
* Constructor.
* @param folder The containing folder
* @param type The event type
* @param removed If true, this event is the result of an explicit
* expunge by this client, and the messages in this
* folder have been renumbered to account for this.
* If false, this event is the result of an expunge
* by external sources.
*
* @param msgs The messages added/removed
*/
public MessageCountEvent(Folder folder, int type,
boolean removed, Message[] msgs) {
super(folder);
this.type = type;
this.removed = removed;
this.msgs = msgs;
}
/**
* Return the type of this event.
* @return type
*/
public int getType() {
return type;
}
/**
* Indicates whether this event is the result of an explicit
* expunge by this client, or due to an expunge from external
* sources. If true, this event is due to an
* explicit expunge and hence all remaining messages in this
* folder have been renumbered. If false, this event
* is due to an external expunge.
*
* Note that this method is valid only if the type of this event
* is REMOVED
*/
public boolean isRemoved() {
return removed;
}
/**
* Return the array of messages added or removed.
* @return array of messages
*/
public Message[] getMessages() {
return msgs;
}
/**
* Invokes the appropriate MessageCountListener method.
*/
public void dispatch(Object listener) {
if (type == ADDED)
((MessageCountListener)listener).messagesAdded(this);
else // REMOVED
((MessageCountListener)listener).messagesRemoved(this);
}
}