/*
 * Copyright (C) 2016 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#include "java_lang_reflect_Parameter.h"

#include "android-base/stringprintf.h"

#include "art_method-inl.h"
#include "common_throws.h"
#include "dex_file-inl.h"
#include "dex_file_annotations.h"
#include "jni_internal.h"
#include "scoped_fast_native_object_access-inl.h"
#include "utils.h"

namespace art {

using android::base::StringPrintf;

static jobject Parameter_getAnnotationNative(JNIEnv* env,
                                             jclass,
                                             jobject javaMethod,
                                             jint parameterIndex,
                                             jclass annotationType) {
  ScopedFastNativeObjectAccess soa(env);
  if (UNLIKELY(javaMethod == nullptr)) {
    ThrowNullPointerException("javaMethod == null");
    return nullptr;
  }

  ArtMethod* method = ArtMethod::FromReflectedMethod(soa, javaMethod);
  if (method->IsProxyMethod()) {
    return nullptr;
  }

  uint32_t parameter_count = method->GetParameterTypeList()->Size();
  if (UNLIKELY(parameterIndex < 0 || static_cast<uint32_t>(parameterIndex) >= parameter_count)) {
    ThrowIllegalArgumentException(
        StringPrintf("Illegal parameterIndex %d for %s, parameter_count is %d",
                     parameterIndex,
                     method->PrettyMethod().c_str(),
                     parameter_count).c_str());
    return nullptr;
  }

  StackHandleScope<1> hs(soa.Self());
  Handle<mirror::Class> klass(hs.NewHandle(soa.Decode<mirror::Class>(annotationType)));
  return soa.AddLocalReference<jobject>(
      annotations::GetAnnotationForMethodParameter(method, parameterIndex, klass));
}

static JNINativeMethod gMethods[] = {
  FAST_NATIVE_METHOD(Parameter,
                getAnnotationNative,
                "(Ljava/lang/reflect/Executable;ILjava/lang/Class;)Ljava/lang/annotation/Annotation;"),
};

void register_java_lang_reflect_Parameter(JNIEnv* env) {
  REGISTER_NATIVE_METHODS("java/lang/reflect/Parameter");
}

}  // namespace art
