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Apache jSieve is a server side mail filtering system implementing RFC3028. Apache jSieve is developed by the JAMES project.

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 * Licensed to the Apache Software Foundation (ASF) under one   *
 * or more contributor license agreements.  See the NOTICE file *
 * distributed with this work for additional information        *
 * regarding copyright ownership.  The ASF licenses this file   *
 * to you under the Apache License, Version 2.0 (the            *
 * "License"); you may not use this file except in compliance   *
 * with the License.  You may obtain a copy of the License at   *
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 * software distributed under the License is distributed on an  *
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package org.apache.jsieve.mail;

import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;

/**
 * Class MailUtils implements utility methods that are useful when processing
 * Sieve mail.
 */
public class MailUtils {

    /**
     * Constructor for MailUtils.
     */
    protected MailUtils() {
        super();
    }

    /**
     * 
     * Method getMatchingHeader answers a List of all of the headers in the mail
     * with the passed name. If no headers are found an empty List is returned.
     * 
     * 
     * 
     * This method differs from MailAdapter.getHeader(String) in that it ignores
     * case and whitespace prefixes and suffixes to a header name when
     * performing the match, as required by RFC 3028. Thus "From", "from ", "
     * From" and " from " are considered equal.
     * 
     * 
     * @param name
     * @return List
     * @throws SieveMailException
     */
    static public List getMatchingHeader(MailAdapter mail, String name)
            throws SieveMailException {
        Iterator headerNamesIter = mail.getHeaderNames().iterator();
        List matchedHeaderValues = new ArrayList(32);
        while (headerNamesIter.hasNext()) {
            String headerName = (String) headerNamesIter.next();
            if (headerName.trim().equalsIgnoreCase(name))
                matchedHeaderValues.addAll(mail.getHeader(headerName));
        }

        return matchedHeaderValues;
    }
}