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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.
*
* @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;
}
}