tree f0909c8da5fed6f1509ad245a89bc664ea568082
parent 14c4651a09ac47a3a71cdf7e284a9f752137dfa3
author Yuta HIGUCHI <y-higuchi@onlab.us> 1404179986 -0700
committer Yuta HIGUCHI <y-higuchi@onlab.us> 1404937873 -0700

Add string attributes to self-containd objects.

- Add common super class to *Event classes, which handles attributes.
- Add string attributes to *Event classes (ONOS-1564)
- Populate string attributes.
  Picked random attribute obtained from OF, just to initially populate attrs.
  Attributes to be used for each elements should be revisited later.
- *Impl class to use/reference self-contained objects
   prep-work for snapshot in mind.
- unified equals implementations
- Add unfrozen Copy constructor.
- Add freeze check to fixed attributes.
- Remove get*Impl which was not really adding value.

Change-Id: I10f9538f87d133a22237bd8ab97b8de421d3930b