Title: Pattern Integration, Variations of State
Authors:  Jim Odrowski and Paul Sogaard, Sprint Corporation
Contact Name:  Jim Odrowski
Email Address: Jim.Odrowski@mokcmtgate.sprint.com
Postal Address:  22754 West 220th St., Spring Hill, KS  66083
Phone Number:  (913) 534-3653

Abstract

In working with a large application development effort a number of
challenges involving the management of object states have arisen.  The
application's developers have embraced the State pattern as the
fundamental way to manage an individual object's stat es.  But through
the course of development a number of complications have been
identified that deal with object states and the dependency between the
states of related objects.  Some variations on the basic State pattern
are needed to solve these design p roblems.  The following patterns
build upon the State pattern, integrating it with other patterns, to
help form solutions to the problems.

Patterns

I.      Composite State
II.     Managing State Dependencies
III.    Decorated State
IV.    Orthogonal States
V.     Current and Pending State
VI.    Collections of State
VII.   Restoring Previous State