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package org.apache.james.mailbox.store.search.comparator;
import java.io.StringReader;
import java.util.Comparator;
import java.util.Date;
import org.apache.james.mailbox.store.mail.model.Message;
import org.apache.james.mime4j.dom.datetime.DateTime;
import org.apache.james.mime4j.field.datetime.parser.DateTimeParser;
import org.apache.james.mime4j.field.datetime.parser.ParseException;
/**
* {@link Comparator} which works like stated in RFC5256 2.2 Sent Date
*
*/
public class SentDateComparator extends AbstractHeaderComparator {
private final static Comparator<Message<?>> SENTDATE = new SentDateComparator(false);
private final static Comparator<Message<?>> REVERSE_SENTDATE = new ReverseComparator(new SentDateComparator(true));
private final boolean reverse;
public SentDateComparator(boolean reverse) {
this.reverse = reverse;
}
@Override
public int compare(Message<?> o1, Message<?> o2) {
Date date1 = getSentDate(o1);
Date date2 = getSentDate(o2);
int i = date1.compareTo(date2);
// sent date was the same so use the uid as tie-breaker
if (i == 0) {
return UidComparator.uid(reverse).compare(o1, o2);
}
return 0;
}
private Date getSentDate(Message<?> message) {
final String value = getHeaderValue("Date", message);
final StringReader reader = new StringReader(value);
try {
DateTime dateTime = new DateTimeParser(reader).parseAll();
return dateTime.getDate();
} catch (ParseException e) {
// if we can not parse the date header we should use the internaldate as fallback
return message.getInternalDate();
}
}
public static Comparator<Message<?>> sentDate(boolean reverse){
if (reverse) {
return REVERSE_SENTDATE;
} else {
return SENTDATE;
}
}
}