A frame decoder for single separate XML based message streams.
A couple examples will better help illustrate
what this decoder actually does.
Given an input array of bytes split over 3 frames like this:
+-----+-----+-----------+
| <an | Xml | Element/> |
+-----+-----+-----------+
this decoder would output a single frame:
+-----------------+
| <anXmlElement/> |
+-----------------+
Given an input array of bytes split over 5 frames like this:
+-----+-----+-----------+-----+----------------------------------+
| <an | Xml | Element/> | <ro | ot><child>content</child></root> |
+-----+-----+-----------+-----+----------------------------------+
this decoder would output two frames:
+-----------------+-------------------------------------+
| <anXmlElement/> | <root><child>content</child></root> |
+-----------------+-------------------------------------+
The byte stream is expected to be in UTF-8 character encoding or ASCII. The current implementation
uses direct
byte to
char cast and then compares that
char to a few low range
ASCII characters like
'<',
'>' or
'/'. UTF-8 is not using low range [0..0x7F]
byte values for multibyte codepoint representations therefore fully supported by this implementation.
Please note that this decoder is not suitable for
xml streaming protocols such as
XMPP,
where an initial xml element opens the stream and only
gets closed at the end of the session, although this class
could probably allow for such type of message flow with
minor modifications.