public void buildMimeMessage()

in src/main/java/org/apache/commons/mail/Email.java [1317:1446]
110 lines of code
22 McCabe index (conditional complexity)

    public void buildMimeMessage() throws EmailException
    {
        if (this.message != null)
        {
            // [EMAIL-95] we assume that an email is not reused therefore invoking
            // buildMimeMessage() more than once is illegal.
            throw new IllegalStateException("The MimeMessage is already built.");
        }

        try
        {
            this.message = this.createMimeMessage(this.getMailSession());

            if (EmailUtils.isNotEmpty(this.subject))
            {
                if (EmailUtils.isNotEmpty(this.charset))
                {
                    this.message.setSubject(this.subject, this.charset);
                }
                else
                {
                    this.message.setSubject(this.subject);
                }
            }

            // update content type (and encoding)
            this.updateContentType(this.contentType);

            if (this.content != null)
            {
                if (EmailConstants.TEXT_PLAIN.equalsIgnoreCase(this.contentType)
                        && this.content instanceof String)
                {
                    // EMAIL-104: call explicitly setText to use default mime charset
                    //            (property "mail.mime.charset") in case none has been set
                    this.message.setText(this.content.toString(), this.charset);
                }
                else
                {
                    this.message.setContent(this.content, this.contentType);
                }
            }
            else if (this.emailBody != null)
            {
                if (this.contentType == null)
                {
                    this.message.setContent(this.emailBody);
                }
                else
                {
                    this.message.setContent(this.emailBody, this.contentType);
                }
            }
            else
            {
                this.message.setText("");
            }

            if (this.fromAddress != null)
            {
                this.message.setFrom(this.fromAddress);
            }
            else
            {
                if (session.getProperty(EmailConstants.MAIL_SMTP_FROM) == null
                        && session.getProperty(EmailConstants.MAIL_FROM) == null)
                {
                    throw new EmailException("From address required");
                }
            }

            if (this.toList.size() + this.ccList.size() + this.bccList.size() == 0)
            {
                throw new EmailException("At least one receiver address required");
            }

            if (!this.toList.isEmpty())
            {
                this.message.setRecipients(
                    Message.RecipientType.TO,
                    this.toInternetAddressArray(this.toList));
            }

            if (!this.ccList.isEmpty())
            {
                this.message.setRecipients(
                    Message.RecipientType.CC,
                    this.toInternetAddressArray(this.ccList));
            }

            if (!this.bccList.isEmpty())
            {
                this.message.setRecipients(
                    Message.RecipientType.BCC,
                    this.toInternetAddressArray(this.bccList));
            }

            if (!this.replyList.isEmpty())
            {
                this.message.setReplyTo(
                    this.toInternetAddressArray(this.replyList));
            }


            if (!this.headers.isEmpty())
            {
                for (final Map.Entry<String, String> entry : this.headers.entrySet())
                {
                    final String foldedValue = createFoldedHeaderValue(entry.getKey(), entry.getValue());
                    this.message.addHeader(entry.getKey(), foldedValue);
                }
            }

            if (this.message.getSentDate() == null)
            {
                this.message.setSentDate(getSentDate());
            }

            if (this.popBeforeSmtp)
            {
                // TODO Why is this not a Store leak? When to close?
                final Store store = session.getStore("pop3");
                store.connect(this.popHost, this.popUsername, this.popPassword);
            }
        }
        catch (final MessagingException me)
        {
            throw new EmailException(me);
        }
    }