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package javax.annotation.processing;
import javax.lang.model.element.Element;
import javax.lang.model.element.TypeElement;
import java.util.LinkedHashSet;
import java.util.Collections;
import java.util.Set;
import java.lang.annotation.Annotation;
/**
* An annotation processing tool framework will {@linkplain
* Processor#process provide an annotation processor with an object
* implementing this interface} so that the processor can query for
* information about a round of annotation processing.
*
* @author Joseph D. Darcy
* @author Scott Seligman
* @author Peter von der Ahé
* @since 1.6
*/
public interface RoundEnvironment {
/**
* {@return {@code true} if types generated by this round will not
* be subject to a subsequent round of annotation processing;
* returns {@code false} otherwise}
*/
boolean processingOver();
/**
* {@return {@code true} if an error was raised in the prior round
* of processing; returns {@code false} otherwise}
*/
boolean errorRaised();
/**
* Returns the {@linkplain Processor root elements} for annotation processing generated
* by the prior round.
*
* @return the root elements for annotation processing generated
* by the prior round, or an empty set if there were none
*/
Set getRootElements();
/**
* Returns the elements annotated with the given annotation type.
* The annotation may appear directly or be inherited. Only
* package elements, module elements, and type elements included in this
* round of annotation processing, or declarations of members,
* constructors, parameters, type parameters, or record components
* declared within those, are returned. Included type elements are {@linkplain
* #getRootElements root types} and any member types nested within
* them. Elements of a package are not considered included simply
* because a {@code package-info} file for that package was
* created.
* Likewise, elements of a module are not considered included
* simply because a {@code module-info} file for that module was
* created.
*
* @param a annotation type being requested
* @return the elements annotated with the given annotation type,
* or an empty set if there are none
* @throws IllegalArgumentException if the argument does not
* represent an annotation type
*/
Set getElementsAnnotatedWith(TypeElement a);
/**
* Returns the elements annotated with one or more of the given
* annotation types.
*
* @apiNote This method may be useful when processing repeating
* annotations by looking for an annotation type and its
* containing annotation type at the same time.
*
* @implSpec The default implementation of this method creates an
* empty result set, iterates over the annotations in the argument
* array calling {@link #getElementsAnnotatedWith(TypeElement)} on
* each annotation and adding those results to the result
* set. Finally, the contents of the result set are returned as an
* unmodifiable set.
*
* @param annotations annotation types being requested
* @return the elements annotated with one or more of the given
* annotation types, or an empty set if there are none
* @throws IllegalArgumentException if the any elements of the
* argument set do not represent an annotation type
* @jls 9.6.3 Repeatable Annotation Interfaces
* @since 9
*/
default Set getElementsAnnotatedWithAny(TypeElement... annotations){
// Use LinkedHashSet rather than HashSet for predictability
Set result = new LinkedHashSet<>();
for (TypeElement annotation : annotations) {
result.addAll(getElementsAnnotatedWith(annotation));
}
return Collections.unmodifiableSet(result);
}
/**
* Returns the elements annotated with the given annotation type.
* The annotation may appear directly or be inherited. Only
* package elements, module elements, and type elements included in this
* round of annotation processing, or declarations of members,
* constructors, parameters, type parameters, or record components
* declared within those, are returned. Included type elements are {@linkplain
* #getRootElements root types} and any member types nested within
* them. Elements in a package are not considered included simply
* because a {@code package-info} file for that package was
* created.
* Likewise, elements of a module are not considered included
* simply because a {@code module-info} file for that module was
* created.
*
* Note: An implementation of this method typically performs
* an internal conversion from the runtime reflective
* representation of an annotation type as a {@code Class} object
* to a different representation used for annotation
* processing. The set of annotation types present in the runtime
* context may differ from the set of annotation types present in
* the context of annotation processing in a particular
* environmental configuration. If an runtime annotation type is
* not present in the annotation processing context, the situation
* is not treated as an error and no elements are found for that
* annotation type.
*
* @param a annotation type being requested
* @return the elements annotated with the given annotation type,
* or an empty set if there are none
* @throws IllegalArgumentException if the argument does not
* represent an annotation type
*
* @see javax.lang.model.AnnotatedConstruct#getAnnotation(Class)
* @see javax.lang.model.AnnotatedConstruct#getAnnotationsByType(Class)
*/
Set getElementsAnnotatedWith(Class a);
/**
* Returns the elements annotated with one or more of the given
* annotation types.
*
*
Note: An implementation of this method typically performs
* an internal conversion from the runtime reflective
* representation of an annotation type as a {@code Class} object
* to a different representation used for annotation
* processing. The set of annotation types present in the runtime
* context may differ from the set of annotation types present in
* the context of annotation processing in a particular
* environmental configuration. If an runtime annotation type is
* not present in the annotation processing context, the situation
* is not treated as an error and no elements are found for that
* annotation type.
*
* @apiNote This method may be useful when processing repeating
* annotations by looking for an annotation type and its
* containing annotation type at the same time.
*
* @implSpec The default implementation of this method creates an
* empty result set, iterates over the annotations in the argument
* set calling {@link #getElementsAnnotatedWith(Class)} on
* each annotation and adding those results to the result
* set. Finally, the contents of the result set are returned as an
* unmodifiable set.
*
* @param annotations annotation types being requested
* @return the elements annotated with one or more of the given
* annotation types, or an empty set if there are none
* @throws IllegalArgumentException if the any elements of the
* argument set do not represent an annotation type
* @jls 9.6.3 Repeatable Annotation Interfaces
*
* @see javax.lang.model.AnnotatedConstruct#getAnnotation(Class)
* @see javax.lang.model.AnnotatedConstruct#getAnnotationsByType(Class)
*
* @since 9
*/
default Set getElementsAnnotatedWithAny(Set> annotations){
// Use LinkedHashSet rather than HashSet for predictability
Set result = new LinkedHashSet<>();
for (Class annotation : annotations) {
result.addAll(getElementsAnnotatedWith(annotation));
}
return Collections.unmodifiableSet(result);
}
}