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Jodd Mail client
There is a newer version: 7.1.0
// Copyright (c) 2003-present, Jodd Team (http://jodd.org)
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
// 1. Redistributions of source code must retain the above copyright notice,
// this list of conditions and the following disclaimer.
//
// 2. Redistributions in binary form must reproduce the above copyright
// notice, this list of conditions and the following disclaimer in the
// documentation and/or other materials provided with the distribution.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
// POSSIBILITY OF SUCH DAMAGE.

package jodd.mail;

import javax.mail.MessagingException;
import javax.mail.Service;
import javax.mail.Session;
import javax.mail.Store;
import javax.mail.Transport;
import javax.mail.internet.MimeUtility;

/**
 * Mail session base.
 */
abstract class MailSession implements AutoCloseable {

	public static class Defaults {
		/**
		 * If set to {@code true}, the setFileName method uses the
		 * {@link MimeUtility#encodeText(String)} to encode any non-ASCII characters in the filename.
		 * Note that this encoding violates the MIME specification, but is useful for interoperating
		 * with some mail clients that use this convention. The default is {@code true}.
		 */
		public static boolean mailMimeEncodefilename = true;
		/**
		 * If set to {@code true}, the setFileName method uses the
		 * {@link MimeUtility#encodeText(String)} to encode any non-ASCII characters in the filename.
		 * Note that this encoding violates the MIME specification, but is useful for interoperating
		 * with some mail clients that use this convention. The default is {@code true}.
		 */
		public static boolean mailMimeDecodefilename = true;
	}

	/**
	 * Setups the system email properties.
	 */
	protected static void setupSystemMailProperties() {
		System.setProperty("mail.mime.encodefilename", Boolean.valueOf(Defaults.mailMimeEncodefilename).toString());
		System.setProperty("mail.mime.decodefilename", Boolean.valueOf(Defaults.mailMimeDecodefilename).toString());
	}

	private final Session session;
	protected final Service service;

	/**
	 * Creates new mail session.
	 *
	 * @param session {@link Session}.
	 * @param service {@link Service} such as {@link Store} or {@link Transport}.
	 */
	protected MailSession(final Session session, final Service service) {
		this.session = session;
		this.service = service;
	}

	/**
	 * Opens session.
	 */
	public void open() {
		try {
			service.connect();
		} catch (final MessagingException msex) {
			throw new MailException("Open session error", msex);
		}
	}

	/**
	 * Closes session.
	 */
	@Override
	public void close() {
		try {
			service.close();
		} catch (final MessagingException mex) {
			throw new MailException("Failed to close session", mex);
		}
	}

	/**
	 * Returns {@code true} if mail session is still connected.
	 *
	 * @return {@code true} if mail session is still connected.
	 */
	public boolean isConnected() {
		return service.isConnected();
	}

	/**
	 * Returns the {@link Session}.
	 *
	 * @return the {@link Session}.
	 */
	public Session getSession() {
		return session;
	}

	/**
	 * Returns the {@link Service}.
	 *
	 * @return the {@link Service}.
	 */
	public abstract T getService();
}