geronimo-mail_2.1_spec/src/main/java/jakarta/mail/internet/MimeBodyPart.java [493:533]:
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    public String[] getHeader(final String name) throws MessagingException {
        return headers.getHeader(name);
    }

    public String getHeader(final String name, final String delimiter) throws MessagingException {
        return headers.getHeader(name, delimiter);
    }

    public void setHeader(final String name, final String value) throws MessagingException {
        headers.setHeader(name, value);
    }

    /**
     * Conditionally set or remove a named header.  If the new value
     * is null, the header is removed.
     *
     * @param name   The header name.
     * @param value  The new header value.  A null value causes the header to be
     *               removed.
     *
     * @exception MessagingException
     */
    private void setOrRemoveHeader(final String name, final String value) throws MessagingException {
        if (value == null) {
            headers.removeHeader(name);
        }
        else {
            headers.setHeader(name, value);
        }
    }

    public void addHeader(final String name, final String value) throws MessagingException {
        headers.addHeader(name, value);
    }

    public void removeHeader(final String name) throws MessagingException {
        headers.removeHeader(name);
    }

    public Enumeration<Header> getAllHeaders() throws MessagingException {
        return headers.getAllHeaders();
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geronimo-mail_2.1_spec/src/main/java/jakarta/mail/internet/MimeMessage.java [1326:1408]:
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    public String[] getHeader(final String name) throws MessagingException {
        return headers.getHeader(name);
    }

    /**
     * Get all headers that match a particular name, as a single string.
     * Individual headers are separated by the provided delimiter.   If
     * the delimiter is null, only the first header is returned.
     *
     * @param name      The source header name.
     * @param delimiter The delimiter string to be used between headers.  If null, only
     *                  the first is returned.
     *
     * @return The headers concatenated as a single string.
     * @exception MessagingException
     */
    public String getHeader(final String name, final String delimiter) throws MessagingException {
        return headers.getHeader(name, delimiter);
    }

    /**
     * Set a new value for a named header.
     *
     * @param name   The name of the target header.
     * @param value  The new value for the header.
     *
     * @exception MessagingException
     */
    public void setHeader(final String name, final String value) throws MessagingException {
        headers.setHeader(name, value);
    }

    /**
     * Conditionally set or remove a named header.  If the new value
     * is null, the header is removed.
     *
     * @param name   The header name.
     * @param value  The new header value.  A null value causes the header to be
     *               removed.
     *
     * @exception MessagingException
     */
    private void setOrRemoveHeader(final String name, final String value) throws MessagingException {
        if (value == null) {
            headers.removeHeader(name);
        }
        else {
            headers.setHeader(name, value);
        }
    }

    /**
     * Add a new value to an existing header.  The added value is
     * created as an additional header of the same type and value.
     *
     * @param name   The name of the target header.
     * @param value  The removed header.
     *
     * @exception MessagingException
     */
    public void addHeader(final String name, final String value) throws MessagingException {
        headers.addHeader(name, value);
    }

    /**
     * Remove a header with the given name.
     *
     * @param name   The name of the removed header.
     *
     * @exception MessagingException
     */
    public void removeHeader(final String name) throws MessagingException {
        headers.removeHeader(name);
    }

    /**
     * Retrieve the complete list of message headers, as an enumeration.
     *
     * @return An Enumeration of the message headers.
     * @exception MessagingException
     */
    public Enumeration<Header> getAllHeaders() throws MessagingException {
        return headers.getAllHeaders();
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