public void execute()

in server/mailet/mailets/src/main/java/org/apache/james/transport/mailets/jsieve/RejectAction.java [83:157]
66 lines of code
5 McCabe index (conditional complexity)

    public void execute(ActionReject anAction, Mail aMail, ActionContext context) throws MessagingException {
        ActionUtils.detectAndHandleLocalLooping(aMail, context, "reject");

        // Create the MDN part
        StringBuilder humanText = new StringBuilder(128);
        humanText.append("This message was refused by the recipient's mail filtering program.");
        humanText.append("\r\n");
        humanText.append("The reason given was:");
        humanText.append("\r\n");
        humanText.append("\r\n");
        humanText.append(anAction.getMessage());

        String reportingUAName = null;
        try {
            reportingUAName = InetAddress.getLocalHost()
                    .getCanonicalHostName();
        } catch (UnknownHostException ex) {
            reportingUAName = "localhost";
        }

        String reportingUAProduct = context.getServerInfo();

        String[] originalRecipients = aMail.getMessage().getHeader(
                "Original-Recipient");
        String originalRecipient = null;
        if (null != originalRecipients && originalRecipients.length > 0) {
            originalRecipient = originalRecipients[0];
        }

        String finalRecipient = context.getRecipient().asString();
        String originalMessageId = aMail.getMessage().getMessageID();

        Multipart multipart = MDN.builder()
            .humanReadableText(humanText.toString())
            .report(
                MDNReport.builder()
                    .reportingUserAgentField(ReportingUserAgent.builder().userAgentName(reportingUAName).userAgentProduct(reportingUAProduct).build())
                    .finalRecipientField(finalRecipient)
                    .originalRecipientField(originalRecipient)
                    .originalMessageIdField(originalMessageId)
                    .dispositionField(Disposition.builder()
                        .actionMode(DispositionActionMode.Automatic)
                        .sendingMode(DispositionSendingMode.Automatic)
                        .type(DispositionType.Deleted)
                        .addModifier(DispositionModifier.Error)
                        .build())
                    .build())
            .build()
            .asMultipart();

        // Send the message
        MimeMessage reply = (MimeMessage) aMail.getMessage().reply(false);
        context.getRecipient().toInternetAddress()
            .ifPresent(Throwing.<Address>consumer(reply::setFrom).sneakyThrow());
        reply.setContent(multipart);
        reply.saveChanges();
        Address[] recipientAddresses = reply.getAllRecipients();
        if (recipientAddresses != null) {
            MailImpl mail = MailImpl.builder()
                .name(MailImpl.getId())
                .addRecipients(Arrays.stream(recipientAddresses)
                    .map(InternetAddress.class::cast)
                    .map(Throwing.function(MailAddress::new))
                    .collect(ImmutableList.toImmutableList()))
                .mimeMessage(reply)
                .build();
            try {
                context.post(mail);
            } finally {
                LifecycleUtil.dispose(mail);
            }
        } else {
            LOGGER.info("Unable to send reject MDN. Could not determine the recipient.");
        }
    }