[jbossseam-issues] [JBoss JIRA] Created: (JBSEAM-2008) Query should use parameterized type for results

[Dan Allen (JIRA)]

Query should use parameterized type for results
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                 Key: JBSEAM-2008
                 URL: http://jira.jboss.com/jira/browse/JBSEAM-2008
             Project: JBoss Seam
          Issue Type: Feature Request
          Components: Tools
    Affects Versions: 2.0.0.CR1
            Reporter: Dan Allen
            Priority: Minor
             Fix For: 2.0.0.GA


I don't see any reason why Query cannot be defined as Query<T, E> rather than Query<T>. The general design of Query is that it operates on a static base query (only the conditions are dynamic). Therefore, the item type in the result list should be anticipated. In any case, if it is not, you can always define it using the generic type Object.

To cite an example, we start with:

public class EntityQuery<E> extends Query<EntityManager, E> {}

We can use it as:

public class CategoryQuery extends EntityQuery<Category> {
}

CategoryQuery q = new CategoryQuery();
for ( Category c : q.getResultList() ) {
  // didn't need to cast!
}

On the other hand, if the query component is defined without the type, it will still work. The type will be treated as java.lang.Object.

public class CategoryQuery extends EntityQuery {
}

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