Add extended enumeration support
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Key: CAY-994
URL: https://issues.apache.org/cayenne/browse/CAY-994
Project: Cayenne
Issue Type: New Feature
Components: Cayenne Core Library, Cayenne Documentation, Cayenne
Examples, Cayenne Website
Affects Versions: 3.0
Environment: All
Reporter: Michael Gentry
Assignee: Michael Gentry
Fix For: 3.0
Current Cayenne support for Java 1.5 enumerations is relatively simplistic.
Given:
enum Color { RED, GREEN, BLUE }
Cayenne will store 0, 1, and 2 (respectively) for a numeric column, or "RED",
"GREEN", and "BLUE" for a string column. There is no way to specify your own
values for the enumerations, which is especially important when mapping to an
existing schema. Also, in the case of numeric types, the order they are
declared is fragile. If someone later sorts the colors to be BLUE, GREEN, RED,
then the values of BLUE and RED will be swapped (and incorrect) on future reads
from the database.
Cayenne needs to be able to support explicitly mapping the enumeration to the
database value.
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