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/*
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 *
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 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License.  You can
 * obtain a copy of the License at
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 * or LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
 *
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 * file and include the License file at LICENSE.txt.
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package javax.mail;

/**
 * The context in which a piece of Message content is contained.  A
 * MessageContext object is returned by the
 * getMessageContext method of the
 * MessageAware interface.  MessageAware is
 * typically implemented by DataSources to allow a
 * DataContentHandler to pass on information about the
 * context in which a data content object is operating.
 *
 * @see javax.mail.MessageAware
 * @see javax.activation.DataSource
 * @see javax.activation.DataContentHandler
 * @since	JavaMail 1.1
 */
public class MessageContext {
    private Part part;

    /**
     * Create a MessageContext object describing the context of the given Part.
     *
     * @param	part	the Part
     */
    public MessageContext(Part part) {
	this.part = part;
    }

    /**
     * Return the Part that contains the content.
     *
     * @return	the containing Part, or null if not known
     */
    public Part getPart() {
	return part;
    }

    /**
     * Return the Message that contains the content.
     * Follows the parent chain up through containing Multipart
     * objects until it comes to a Message object, or null.
     *
     * @return	the containing Message, or null if not known
     */
    public Message getMessage() {
	try {
	    return getMessage(part);
	} catch (MessagingException ex) {
	    return null;
	}
    }

    /**
     * Return the Message containing an arbitrary Part.
     * Follows the parent chain up through containing Multipart
     * objects until it comes to a Message object, or null.
     *
     * @return	the containing Message, or null if none
     * @see javax.mail.BodyPart#getParent
     * @see javax.mail.Multipart#getParent
     */
    private static Message getMessage(Part p) throws MessagingException {
	while (p != null) {
	    if (p instanceof Message)
		return (Message)p;
	    BodyPart bp = (BodyPart)p;
	    Multipart mp = bp.getParent();
	    if (mp == null)	// MimeBodyPart might not be in a MimeMultipart
		return null;
	    p = mp.getParent();
	}
	return null;
    }

    /**
     * Return the Session we're operating in.
     *
     * @return	the Session, or null if not known
     */
    public Session getSession() {
	Message msg = getMessage();
	return msg != null ? msg.getSession() : null;
    }
}