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Mailets integrating DKIM functions
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 * regarding copyright ownership.  The ASF licenses this file   *
 * to you under the Apache License, Version 2.0 (the            *
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 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY       *
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package org.apache.james.jdkim.mailets;

import java.util.Enumeration;
import java.util.HashMap;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;

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

import org.apache.james.jdkim.api.Headers;

/**
 * An adapter to let DKIMSigner read headers from MimeMessage
 */
final class MimeMessageHeaders implements Headers {

    private Map> headers;
    private List fields;

    @SuppressWarnings("unchecked")
    public MimeMessageHeaders(MimeMessage message)
            throws MessagingException {
        headers = new HashMap>();
        fields = new LinkedList();
        for (Enumeration e = message.getAllHeaderLines(); e
                .hasMoreElements();) {
            String head = (String) e.nextElement();
            int p = head.indexOf(':');
            if (p <= 0)
                throw new MessagingException("Bad header line: " + head);
            String headerName = head.substring(0, p).trim();
            String headerNameLC = headerName.toLowerCase();
            fields.add(headerName);
            List strings = (List) headers.get(headerNameLC);
            if (strings == null) {
                strings = new LinkedList();
                headers.put(headerNameLC, strings);
            }
            strings.add(head);
        }
    }

    public List getFields() {
        return fields;
    }

    public List getFields(String name) {
        return headers.get(name.toLowerCase());
    }
}