Package cz.cvut.kbss.jopa.model.annotations

Annotation Interface ConstructorResult

@Target({})
@Retention(RUNTIME)
public @interface ConstructorResult

Used in conjunction with the SparqlResultSetMapping annotation to map the SELECT clause of a SPARQL query to a constructor.

Applies a constructor for the target class, passing in as arguments values from the specified variables. All variables corresponding to arguments of the intended constructor must be specified using the variables element of the ConstructorResult annotation in the same order as that of the argument list of the constructor. Any entities returned as constructor results will be in either the new or detached state, depending on whether a primary key is retrieved for the constructed object.

Example:

     
 Query q = em.createNativeQuery("SELECT ?uri ?label ?comment WHERE {" +
             "?uri a <http://onto.fel.cvut.cz/ontologies/jopa/Example> ;" +
                  "rdfs:label ?label ;" +
                  "rdfs:comment ?comment ." +
         "}", "ExampleResults");
     
 

     
 @SparqlResultSetMapping(name="ExampleResults",
          classes={
              @ConstructorResult(targetClass=cz.cvut.kbss.jopa.Example, variables={
                  @VariableResult(name="uri"),
                  @VariableResult(name="label"),
                  @VariableResult(name="comment")
              }
          }
      )
     
 

See Also:

• SparqlResultSetMapping
• VariableResult

Required Element Summary

Required Elements

Modifier and Type	Required Element	Description
Class<?>	targetClass	(Required) The class whose constructor is to be invoked.
VariableResult[]	variables	(Required) The mapping of variables in the SELECT list to the arguments of the intended constructor, in order.

Element Details

targetClass

Class<?> targetClass

(Required) The class whose constructor is to be invoked.

variables

VariableResult[] variables

(Required) The mapping of variables in the SELECT list to the arguments of the intended constructor, in order.