package com.tll.mail;
import java.io.UnsupportedEncodingException;
import java.util.List;
import javax.mail.MessagingException;
import javax.mail.internet.MimeMessage;
import org.springframework.mail.MailPreparationException;
import org.springframework.mail.javamail.MimeMessageHelper;
/**
* The abstract mime message composer.
* @author jpk
* @param <C> the mail context type
*/
abstract class AbstractComposer<C extends IMailContext> implements IComposer<C> {
/**
* Implementation specific composition.
* @param helper Spring's mime message helper.
* @param context The mail context.
* @throws MailPreparationException
*/
protected abstract void composeImpl(MimeMessageHelper helper, C context) throws MailPreparationException;
@Override
public final MimeMessage compose(MimeMessage mimeMessage, C context) throws MailPreparationException {
// create a mime message helper
MimeMessageHelper helper;
try {
helper = new MimeMessageHelper(mimeMessage, true, context.getEncoding());
}
catch(final MessagingException me) {
throw new MailPreparationException("Unable to create the mime message helper", me);
}
// apply the routing
final MailRouting mailRouting = context.getRouting();
if(mailRouting == null) {
throw new MailPreparationException("No email routing specified.");
}
try {
// sender
final NameEmail sender = mailRouting.getSender();
if(sender != null) {
helper.setFrom(sender.getEmailAddress(), sender.getName());
}
List<NameEmail> list;
// recipients
list = mailRouting.getRecipients();
if(list.isEmpty()) {
throw new MailPreparationException("No email recipients specified");
}
for(final NameEmail email : list) {
helper.addTo(email.getEmailAddress(), email.getName());
}
// ccs
list = mailRouting.getCcList();
if(list != null && list.size() > 0) {
for(final NameEmail email : list) {
helper.addCc(email.getEmailAddress(), email.getName());
}
}
// bccs
list = mailRouting.getBccList();
if(list != null && list.size() > 0) {
for(final NameEmail email : list) {
helper.addBcc(email.getEmailAddress(), email.getName());
}
}
}
catch(final UnsupportedEncodingException uee) {
throw new MailPreparationException("Unsupported mime message encoding: " + uee.getMessage(), uee);
}
catch(final MessagingException me) {
throw new MailPreparationException("Trouble performing the initial mime message compose:" + me.getMessage(), me);
}
// do implemenation specific composing
composeImpl(helper, context);
// add attachments
try {
final List<Attachment> attachments = context.getAttachments();
if(!attachments.isEmpty()) {
for(final Attachment attachment : attachments) {
helper.addAttachment(attachment.getName(), attachment.getDataSource());
}
}
}
catch(final MessagingException me) {
throw new MailPreparationException("Unable to add email attachments:" + me.getMessage(), me);
}
return helper.getMimeMessage();
}
}