/**

  * Copyright (c) 2014-2017, jcabi.com

  * 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. 3) Neither the name of the jcabi.com nor

  * the names of its contributors may be used to endorse or promote

  * products derived from this software without specific prior written

  * permission.

  *

  * 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 com.jcabi.email.stamp;

 import com.jcabi.aspects.Immutable;

 import com.jcabi.aspects.Loggable;

 import com.jcabi.email.Stamp;

 import java.io.UnsupportedEncodingException;

 import javax.mail.Message;

 import javax.mail.MessagingException;

 import javax.mail.internet.MimeUtility;

 import lombok.EqualsAndHashCode;

 import lombok.ToString;

 /**

  * Stamp for a MIME envelope, with a subject.

  *

  * @author Yegor Bugayenko (yegor@teamed.io)

  * @version $Id: 87090ba9498a44fee55a610a79a7fc651d22316c $

  * @since 1.0

  */

 @Immutable

 @ToString

 @EqualsAndHashCode(of = {"subject", "charset"})

 @Loggable(Loggable.DEBUG)

 public final class StSubject implements Stamp {

     /**

      * Subject.

      */

     private final transient String subject;

     /**

      * Subject charset.

      */

     private final transient String charset;

     /**

      * Ctor.

      * @param subj Subject

      */

     public StSubject(final String subj) {

         this(subj, "UTF-8");

     }

     /**

      * Ctor.

      * @param subj Subject

      * @param charset Subject charset

      */

     public StSubject(final String subj, final String charset) {

         this.subject = subj;

         this.charset = charset;

     }

     @Override

     public void attach(final Message message) throws MessagingException {

         try {

             message.setSubject(

                 MimeUtility.encodeText(this.subject, this.charset, "Q")

             );

         } catch (final UnsupportedEncodingException ex) {

             throw new IllegalStateException(ex);

         }

     }

 }