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*/
package javax.mail;
/**
* The context in which a piece of Message content is contained. A
* <code>MessageContext</code> object is returned by the
* <code>getMessageContext</code> method of the
* <code>MessageAware</code> interface. <code>MessageAware</code> is
* typically implemented by <code>DataSources</code> to allow a
* <code>DataContentHandler</code> 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.
*/
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.session : null;
}
}