com.mangofactory.swagger.readers.operation.parameter.ParameterAnnotationReader Maven / Gradle / Ivy
package com.mangofactory.swagger.readers.operation.parameter;
import com.google.common.base.Optional;
import com.google.common.base.Predicate;
import org.springframework.core.MethodParameter;
import java.lang.annotation.Annotation;
import java.lang.reflect.Method;
import static com.google.common.collect.Iterables.*;
import static com.google.common.collect.Lists.*;
class ParameterAnnotationReader {
private static Predicate annotationOfType(final Class annotationType) {
return new Predicate() {
@Override
public boolean apply(Annotation input) {
return input.annotationType().equals(annotationType);
}
};
}
private static Optional interfaceMethod(Class iface, Method method) {
try {
return Optional.of(iface.getMethod(method.getName(), method.getParameterTypes()));
} catch (NoSuchMethodException ex) {
return Optional.absent();
}
}
@SuppressWarnings("unchecked")
static A searchOnInterfaces(Method method,
int parameterIndex,
Class annotationType,
Class[] interfaces) {
A annotation = null;
for (Class interfaze : interfaces) {
Optional interfaceMethod = interfaceMethod(interfaze, method);
if (interfaceMethod.isPresent()) {
Method superMethod = interfaceMethod.get();
Optional found = tryFind(
newArrayList(superMethod.getParameterAnnotations()[parameterIndex]), annotationOfType(annotationType));
if (found.isPresent()) {
annotation = (A) found.get();
break;
}
Class[] superInterfaces = superMethod.getDeclaringClass().getInterfaces();
annotation = searchOnInterfaces(superMethod, parameterIndex, annotationType, superInterfaces);
}
}
return annotation;
}
Optional fromHierarchy(MethodParameter methodParameter, Class annotationType) {
return Optional.fromNullable(searchOnInterfaces(methodParameter.getMethod(),
methodParameter.getParameterIndex(),
annotationType,
getParentInterfaces(methodParameter)));
}
Class[] getParentInterfaces(MethodParameter methodParameter) {
return methodParameter.getMethod().getDeclaringClass().getInterfaces();
}
}