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How to resolve a referenced type in a compilation unit [message #632056]

Mon, 11 October 2010 07:47

Eclipse User

Hello,

I'm trying to find a clean way to resolve a referenced type in a compilation unit.
For example, given the following code :


package com.example.rs;

import javax.persistence.EntityManager;


@Path(CustomerResource.URI_BASE)
public class CustomerResource {

	private final org.slf4j.Logger logger = LoggerFactory.getLogger(CustomerResource.class);

	@PersistenceContext
	private EntityManager entityManager = null;

        public static final String URI_BASE = "/customers";

   ...
}

I would expect the following results :

resolveType(entityManager) -> IType(javax.persistence.EntityManager)
resolveType(org.slf4j.Logger logger) -> IType(org.slf4j.Logger logger)
resolveType(CustomerResource) -> IType(com.example.rs.CustomerResource)

For now, I managed to write a utility method that basically :

creates an AST Parser and parses the given IType (here, CustomerResouce)
retrieve the imports
iterates on the ImportDeclarations to match the Type without the package name (EntityManager, Logger, CustomerResource)
Returns the IType based on the fully qualified name

Is there somthing equivalent or better in the Eclipse AST/JDT APIs for such a need ?

Thank you in advance
Regards,
Xavier

Re: How to resolve a referenced type in a compilation unit [message #632059 is a reply to message #632056]

Mon, 11 October 2010 08:14

Eclipse User

Never mind, I found how to resolve my initial problem using a custom ASTVisitor and bindings.

The initial issue was to evaluate a given annotation attribute value on specific Types.
Using an ASTVisitor like this seems to do the underlying job:

@Override
	public boolean visit(TypeDeclaration node) {
		for(Object modifier : (List<?>)node.getStructuralProperty(TypeDeclaration.MODIFIERS2_PROPERTY)) {
			if(modifier instanceof Annotation) {
				IAnnotationBinding annotationBinding = ((Annotation)modifier).resolveAnnotationBinding();
				annotationBinding.getAllMemberValuePairs();
...
			}
		}
		
	}

Xavier

Re: How to resolve a referenced type in a compilation unit [message #633023 is a reply to message #632059]

Fri, 15 October 2010 02:50

Eclipse User

Xavier Coulon wrote:
> Never mind, I found how to resolve my initial problem using a custom
> ASTVisitor and bindings.
>
> The initial issue was to evaluate a given annotation attribute value on
> specific Types. Using an ASTVisitor like this seems to do the underlying
> job:
>
> @Override
> public boolean visit(TypeDeclaration node) {
> for(Object modifier :
> (List<?> )node.getStructuralProperty(TypeDeclaration.MODIFIERS2_PROPE RTY)) {
> if(modifier instanceof Annotation) {
> IAnnotationBinding annotationBinding =
> ((Annotation)modifier).resolveAnnotationBinding();
> annotationBinding.getAllMemberValuePairs();
> ..
> }
> }
>
> }

It sounds like this might also be a problem you can solve with an
annotation processor. Doing it that way
(javax.lang.annotation.processing.Processor) will mean that you have a
standardized solution that can also run at the command line and that
does not depend on Eclipse.

Re: How to resolve a referenced type in a compilation unit [message #633259 is a reply to message #633023]

Fri, 15 October 2010 17:30

Eclipse User

Some really insightful information here. Thanks a lot for sharing. It is well appreciated Smile

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