k-9/src/com/fsck/k9/mail/Transport.java

package com.fsck.k9.mail;

import com.fsck.k9.Account;
import com.fsck.k9.mail.transport.SmtpTransport;
import com.fsck.k9.mail.transport.WebDavTransport;

public abstract class Transport {
    protected static final int SOCKET_CONNECT_TIMEOUT = 10000;

    // RFC 1047
    protected static final int SOCKET_READ_TIMEOUT = 300000;

    public synchronized static Transport getInstance(Account account) throws MessagingException {
        String uri = account.getTransportUri();
        if (uri.startsWith("smtp")) {
            return new SmtpTransport(uri);
        } else if (uri.startsWith("webdav")) {
            return new WebDavTransport(account);
        } else {
            throw new MessagingException("Unable to locate an applicable Transport for " + uri);
        }
    }

    public abstract void open() throws MessagingException;

    public abstract void sendMessage(Message message) throws MessagingException;

    public abstract void close();
}