/**
* Returns true if the method is a provider.
*
* <p>Synthetic bridge methods are excluded. Starting with JDK 8, javac copies annotations onto
* bridge methods (which always have erased signatures).
*/
private Optional<Annotation> isProvider(Binder binder, Method method) {
if (method.isBridge() || method.isSynthetic()) {
return Optional.absent();
}
Annotation annotation = null;
for (Class<? extends Annotation> annotationClass : scanner.annotationClasses()) {
Annotation foundAnnotation = method.getAnnotation(annotationClass);
if (foundAnnotation != null) {
if (annotation != null) {
binder.addError(
"More than one annotation claimed by %s on method %s."
+ " Methods can only have one annotation claimed per scanner.",
scanner, method);
return Optional.absent();
}
annotation = foundAnnotation;
}
}
return Optional.fromNullable(annotation);
}
private <T> ProviderMethod<T> createProviderMethod(
Binder binder, Method method, Annotation annotation) {
binder = binder.withSource(method);
Errors errors = new Errors(method);
// prepare the parameter providers
InjectionPoint point = InjectionPoint.forMethod(method, typeLiteral);
List<Dependency<?>> dependencies = point.getDependencies();
List<Provider<?>> parameterProviders = Lists.newArrayList();
for (Dependency<?> dependency : point.getDependencies()) {
parameterProviders.add(binder.getProvider(dependency));
}
@SuppressWarnings("unchecked") // Define T as the method's return type.
TypeLiteral<T> returnType = (TypeLiteral<T>) typeLiteral.getReturnType(method);
Key<T> key = getKey(errors, returnType, method, method.getAnnotations());
try {
key = scanner.prepareMethod(binder, annotation, key, point);
} catch (Throwable t) {
binder.addError(t);
}
Class<? extends Annotation> scopeAnnotation =
Annotations.findScopeAnnotation(errors, method.getAnnotations());
for (Message message : errors.getMessages()) {
binder.addError(message);
}
return ProviderMethod.create(
key,
method,
delegate,
ImmutableSet.copyOf(dependencies),
parameterProviders,
scopeAnnotation,
skipFastClassGeneration,
annotation);
}