Method Detail

• getAttachment

  <T> T getAttachment(AttachmentKey<T> key)

  Get an attachment value. If no attachment exists for this key, null is returned.

  Type Parameters:

  T - the value type

  Parameters:

  key - the attachment key

  Returns:

  the value, or null if there is none

• getAttachmentList

  <T> List<T> getAttachmentList(AttachmentKey<? extends List<T>> key)

  Gets a list attachment value. If not attachment exists for this key an empty list is returned

  Type Parameters:

  T - the value type

  Parameters:

  key - the attachment key

  Returns:

  the value, or an empty list if there is none

• putAttachment

  <T> T putAttachment(AttachmentKey<T> key,
                      T value)

  Set an attachment value. If an attachment for this key was already set, return the original value. If the value being set is null, the attachment key is removed.

  Type Parameters:

  T - the value type

  Parameters:

  key - the attachment key

  value - the new value

  Returns:

  the old value, or null if there was none

• removeAttachment

  <T> T removeAttachment(AttachmentKey<T> key)

  Remove an attachment, returning its previous value.

  Type Parameters:

  T - the value type

  Parameters:

  key - the attachment key

  Returns:

  the old value, or null if there was none

• addToAttachmentList

  <T> void addToAttachmentList(AttachmentKey<AttachmentList<T>> key,
                               T value)

  Add a value to a list-typed attachment key. If the key is not mapped, add such a mapping.

  Type Parameters:

  T - the list value type

  Parameters:

  key - the attachment key

  value - the value to add