Carsten Ziegeler created SLING-2739:
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             Summary: Add methods for handling the resource type hierarchy to 
the resource resolver
                 Key: SLING-2739
                 URL: https://issues.apache.org/jira/browse/SLING-2739
             Project: Sling
          Issue Type: Task
          Components: API, ResourceResolver, Servlets
            Reporter: Carsten Ziegeler
            Assignee: Carsten Ziegeler
             Fix For: Servlets Resolver 2.2.2, API 2.3.2, Resource Resolver 
1.0.6


Looking again at SLING-2708, I think we have a fundamental misconception in the 
way we treat the resource type hierarchy. This affects the isA check and the 
detection of the effective resource super type by looking at the resource tree.
In early Sling versions we used the current resource resolver (session) in the 
implementation of those functions, but as soon as the resource resolver did not 
have read access to the search paths in the
resource tree, these checks failed. After hitting this problem, we implemented 
the isA check by implementing a resource decorator in the Sling Servlet 
Resolver (SLING-2693). The idea was to use the same user as we use to resolve 
scripts. With SLING-2708 we hit another area where this problem occurs.

Now, looking back, I think the solution of SLING-2693 is wrong - the resource 
type hierarchy has nothing to do with execution rights and is completely 
independent from executing scripts.

I think we should rather add three methods to the resource resolver:
    String getResourceSuperType(final Resource resource);
    String getResourceSuperType(final String resourceType);
    boolean isResourceType(final Resource resource, final String resourceType);

Now, the corresponding three methods on ResourceUtil can be deprecated and call 
the ResourceResolver methods instead.
The AbstractResource#isResourceType(String) method can be changed to call the 
method on the ResourceResolver as well

With this we have a central implementation at a convenient place. We remove the 
workaround from the servlet resolver.


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