David Jencks created FELIX-4607:
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Summary: [DS] Configure with nested annotations/interfaces
Key: FELIX-4607
URL: https://issues.apache.org/jira/browse/FELIX-4607
Project: Felix
Issue Type: New Feature
Components: Declarative Services (SCR)
Affects Versions: scr-2.0.0
Reporter: David Jencks
Assignee: David Jencks
RFC 190 has the unfortunate limitation that annotations used for configuration
cannot have annotation field values. This is easy to remedy if we pick a
format for mapping typed data trees into a map. I'm going to implement this
following James Strachan's system for creating an xml DSL for spring
configuration for ActiveMQ (see also geronimo's xbean-spring and
xbean-blueprint) and inspired by xpath.
Here's an example of how the mapping works. Lets say you have annotations
A { B[] b();} and B { String foo();}. The configuration map will have entries
with keys of the form:
b.0.foo
b.1.foo
b.2.foo
b.<arrayIndex>.foo
<element name of outer class>.<arrayIndex>.<element name of inner class>
Obviously this can be extended to any level of nesting. Non array annotation
valued elements will correspond to arrayIndex 0.
To extend support to interfaces with inheritance, it's also necessary to
include the class of the desired sub-interface in the source map. I don't have
a proposal yet for the name of the sub key.
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