org.apache.james.jmap.model.Envelope Maven / Gradle / Ivy

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package org.apache.james.jmap.model;

import java.util.List;
import java.util.Objects;
import java.util.Optional;
import java.util.Set;
import java.util.stream.Stream;

import org.apache.james.core.MailAddress;
import org.apache.james.mime4j.dom.address.AddressList;
import org.apache.james.mime4j.dom.address.Mailbox;
import org.apache.james.mime4j.dom.address.MailboxList;
import org.apache.james.util.StreamUtils;

import com.github.fge.lambdas.Throwing;
import com.github.steveash.guavate.Guavate;
import com.google.common.base.Preconditions;

public class Envelope {

    public static Envelope fromMessage(Message jmapMessage) {
        MailAddress sender = jmapMessage.getFrom()
            .map(Emailer::toMailAddress)
            .orElseThrow(() -> new RuntimeException("Sender is mandatory"));

        Stream to = emailersToMailAddresses(jmapMessage.getTo());
        Stream cc = emailersToMailAddresses(jmapMessage.getCc());
        Stream bcc = emailersToMailAddresses(jmapMessage.getBcc());

        return new Envelope(sender,
            StreamUtils.flatten(Stream.of(to, cc, bcc))
                .collect(Guavate.toImmutableSet()));
    }

    public static Envelope fromMime4JMessage(org.apache.james.mime4j.dom.Message mime4JMessage) {
        MailAddress sender = mime4JMessage.getFrom()
            .stream()
            .findAny()
            .map(Mailbox::getAddress)
            .map(Throwing.function(MailAddress::new))
            .orElseThrow(() -> new RuntimeException("Sender is mandatory"));

        Stream to = emailersToMailAddresses(mime4JMessage.getTo());
        Stream cc = emailersToMailAddresses(mime4JMessage.getCc());
        Stream bcc = emailersToMailAddresses(mime4JMessage.getBcc());

        return new Envelope(sender,
            StreamUtils.flatten(Stream.of(to, cc, bcc))
                .collect(Guavate.toImmutableSet()));
    }

    private static Stream emailersToMailAddresses(List emailers) {
        return emailers.stream()
            .map(Emailer::toMailAddress);
    }

    private static Stream emailersToMailAddresses(AddressList addresses) {
        return Optional.ofNullable(addresses)
            .map(AddressList::flatten)
            .map(MailboxList::stream)
            .orElse(Stream.of())
            .map(Mailbox::getAddress)
            .map(Throwing.function(MailAddress::new));
    }


    private final MailAddress from;
    private final Set recipients;

    private Envelope(MailAddress from, Set recipients) {
        Preconditions.checkNotNull(from);
        Preconditions.checkNotNull(recipients);

        this.from = from;
        this.recipients = recipients;
    }

    public MailAddress getFrom() {
        return from;
    }

    public Set getRecipients() {
        return recipients;
    }

    @Override
    public final boolean equals(Object o) {
        if (o instanceof Envelope) {
            Envelope envelope = (Envelope) o;

            return Objects.equals(this.from, envelope.from)
                && Objects.equals(this.recipients, envelope.recipients);
        }
        return false;
    }

    @Override
    public final int hashCode() {
        return Objects.hash(from, recipients);
    }
}