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 * regarding copyright ownership.  The ASF licenses this file   *
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package org.apache.james.transport.matchers;

import java.util.Collection;
import java.util.Enumeration;

import javax.mail.Header;
import javax.mail.MessagingException;
import javax.mail.internet.MimeMessage;

import org.apache.james.core.MailAddress;
import org.apache.mailet.Mail;
import org.apache.mailet.base.GenericMatcher;
import org.apache.mailet.base.MailetUtil;
import org.apache.mailet.base.RFC2822Headers;

/**
 * Matches mail which has been relayed more than a given number of times.
 * @version 1.0.0, 1/5/2000
 */

public class RelayLimit extends GenericMatcher {
    int limit = 30;

    @Override
    public void init() throws MessagingException {
        limit = MailetUtil.getInitParameterAsStrictlyPositiveInteger(getCondition());
    }

    @Override
    public Collection<MailAddress> match(Mail mail) throws javax.mail.MessagingException {
        MimeMessage mm = mail.getMessage();
        int count = 0;
        for (Enumeration<Header> e = mm.getAllHeaders(); e.hasMoreElements();) {
            Header hdr = e.nextElement();
            if (hdr.getName().equals(RFC2822Headers.RECEIVED)) {
                count++;
            }
        }
        if (count >= limit) {
            return mail.getRecipients();
        } else {
            return null;
        }
    }
}
