blob: 48082bd43ea41ee6f5c38cf1f4569ca68668d715 [file] [log] [blame]
/*
* Copyright 2017 The WebRTC project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#include "sdk/android/native_api/jni/class_loader.h"
#include <algorithm>
#include <string>
#include "rtc_base/checks.h"
#include "sdk/android/generated_native_api_jni/WebRtcClassLoader_jni.h"
#include "sdk/android/native_api/jni/java_types.h"
#include "sdk/android/native_api/jni/scoped_java_ref.h"
// Abort the process if `jni` has a Java exception pending. This macros uses the
// comma operator to execute ExceptionDescribe and ExceptionClear ignoring their
// return values and sending "" to the error stream.
#define CHECK_EXCEPTION(jni) \
RTC_CHECK(!jni->ExceptionCheck()) \
<< (jni->ExceptionDescribe(), jni->ExceptionClear(), "")
namespace webrtc {
namespace {
class ClassLoader {
public:
explicit ClassLoader(JNIEnv* env)
: class_loader_(jni::Java_WebRtcClassLoader_getClassLoader(env)) {
class_loader_class_ = reinterpret_cast<jclass>(
env->NewGlobalRef(env->FindClass("java/lang/ClassLoader")));
CHECK_EXCEPTION(env);
load_class_method_ =
env->GetMethodID(class_loader_class_, "loadClass",
"(Ljava/lang/String;)Ljava/lang/Class;");
CHECK_EXCEPTION(env);
}
ScopedJavaLocalRef<jclass> FindClass(JNIEnv* env, const char* c_name) {
// ClassLoader.loadClass expects a classname with components separated by
// dots instead of the slashes that JNIEnv::FindClass expects.
std::string name(c_name);
std::replace(name.begin(), name.end(), '/', '.');
ScopedJavaLocalRef<jstring> j_name = NativeToJavaString(env, name);
const jclass clazz = static_cast<jclass>(env->CallObjectMethod(
class_loader_.obj(), load_class_method_, j_name.obj()));
CHECK_EXCEPTION(env);
return ScopedJavaLocalRef<jclass>(env, clazz);
}
private:
ScopedJavaGlobalRef<jobject> class_loader_;
jclass class_loader_class_;
jmethodID load_class_method_;
};
static ClassLoader* g_class_loader = nullptr;
} // namespace
void InitClassLoader(JNIEnv* env) {
RTC_CHECK(g_class_loader == nullptr);
g_class_loader = new ClassLoader(env);
}
ScopedJavaLocalRef<jclass> GetClass(JNIEnv* env, const char* c_name) {
if (g_class_loader != nullptr) {
// The class loader will be null in the JNI code called from the ClassLoader
// ctor when we are bootstrapping ourself.
return g_class_loader->FindClass(env, c_name);
}
// jni_zero generated code uses dots instead of slashes.
// Convert to use slashes since that's what JNI's FindClass expects.
// See
// https://cs.android.com/android/platform/superproject/main/+/main:art/runtime/jni/check_jni.cc;l=349;drc=0f62043c1670cd365aba1894ad8046cdfc1c905d
std::string name(c_name);
std::replace(name.begin(), name.end(), '.', '/');
return ScopedJavaLocalRef<jclass>(env, env->FindClass(name.c_str()));
}
} // namespace webrtc