Method checkExists

app/src/main/java/com/sun/mail/imap/IMAPFolder.java:429–435

()

     * ASSERT: Must be called with this folder's synchronization lock held.
     */
    protected void checkExists() throws MessagingException {
	// If the boolean field 'exists' is false, check with the
	// server by invoking exists() ..
	if (!exists && !exists())
	    throw new FolderNotFoundException(
		this, fullName + " not found");
    }

    /*
     * Ensure the folder is closed.