[JIRA] (JSE-49) Allow NamespaceHandler base class to sub-delegate to additional handlers

[Scott Cantor (Jira)]

Scott Cantor ( https://shibboleth.atlassian.net/secure/ViewProfile.jspa?accountId=557058%3A5b78efc9-1379-42cc-a3f6-56c6ea3a0007 ) *created* an issue

Spring Extensions ( https://shibboleth.atlassian.net/browse/JSE?atlOrigin=eyJpIjoiMzllMTM5YjRlZGUxNGUyNTgwYmJiZDQwMzA1Zjg5ZmUiLCJwIjoiaiJ9 ) / New Feature ( https://shibboleth.atlassian.net/browse/JSE-49?atlOrigin=eyJpIjoiMzllMTM5YjRlZGUxNGUyNTgwYmJiZDQwMzA1Zjg5ZmUiLCJwIjoiaiJ9 ) JSE-49 ( https://shibboleth.atlassian.net/browse/JSE-49?atlOrigin=eyJpIjoiMzllMTM5YjRlZGUxNGUyNTgwYmJiZDQwMzA1Zjg5ZmUiLCJwIjoiaiJ9 ) Allow NamespaceHandler base class to sub-delegate to additional handlers ( https://shibboleth.atlassian.net/browse/JSE-49?atlOrigin=eyJpIjoiMzllMTM5YjRlZGUxNGUyNTgwYmJiZDQwMzA1Zjg5ZmUiLCJwIjoiaiJ9 )

Issue Type: New Feature Assignee: Scott Cantor ( https://shibboleth.atlassian.net/secure/ViewProfile.jspa?accountId=557058%3A5b78efc9-1379-42cc-a3f6-56c6ea3a0007 ) Created: 17/Jun/22 2:12 PM Fix Versions: 7.0.0 Priority: Trivial Reporter: Scott Cantor ( https://shibboleth.atlassian.net/secure/ViewProfile.jspa?accountId=557058%3A5b78efc9-1379-42cc-a3f6-56c6ea3a0007 )

We have cases where a single schema includes plugins that are definitely not IdP-specific but others that probably are and depend on classes that aren’t likely to move out of the IdP. Unless we go back to multiple namespaces (and break the existing xsi:types people are using, again), we would have to define the schema at the lower level but allow some of the types to be handled by a higher layer.

The DefaultNamespaceHandlerResolver in Spring’s bean definition reader is limited to one handler per namespace. We could override this by plugging our own in and using our custom reader class to install it, but that’s probably more invasive to keep working than just implementing our own extension in our NamespaceHandler base class that allows it to delegate registrations to another class. That would let the parsers live at either layer for the same schema namespace.

We probably just do this with META-INF/somethingnew and instantiating the classes with reflection, same way Spring does it.

( https://shibboleth.atlassian.net/browse/JSE-49#add-comment?atlOrigin=eyJpIjoiMzllMTM5YjRlZGUxNGUyNTgwYmJiZDQwMzA1Zjg5ZmUiLCJwIjoiaiJ9 ) Add Comment ( https://shibboleth.atlassian.net/browse/JSE-49#add-comment?atlOrigin=eyJpIjoiMzllMTM5YjRlZGUxNGUyNTgwYmJiZDQwMzA1Zjg5ZmUiLCJwIjoiaiJ9 )

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