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// Copyright 2017 The Cobalt Authors. All Rights Reserved.
//
// 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.
#ifndef STARBOARD_ANDROID_SHARED_JNI_UTILS_H_
#define STARBOARD_ANDROID_SHARED_JNI_UTILS_H_
#include <jni.h>
#include "starboard/android/shared/jni_env_ext.h"
#include "starboard/common/log.h"
#include "starboard/configuration.h"
#include "starboard/memory.h"
namespace starboard {
namespace android {
namespace shared {
// Wrapper class to manage the lifetime of a local reference to Java type
// |JT|. This is necessary for local references to |JT|s that are obtained in
// native code that was not called into from Java, since they will otherwise
// not be cleaned up.
template <typename JT>
class ScopedLocalJavaRef {
public:
explicit ScopedLocalJavaRef(jobject j_object = NULL)
: jt_(static_cast<JT>(j_object)) {}
~ScopedLocalJavaRef() {
if (jt_) {
JniEnvExt::Get()->DeleteLocalRef(jt_);
jt_ = NULL;
}
}
JT Get() const { return jt_; }
void Reset(jobject j_object) {
if (jt_) {
JniEnvExt::Get()->DeleteLocalRef(jt_);
}
jt_ = static_cast<JT>(j_object);
}
operator bool() const { return jt_; }
private:
JT jt_;
ScopedLocalJavaRef(const ScopedLocalJavaRef&) = delete;
void operator=(const ScopedLocalJavaRef&) = delete;
};
// Convenience class to manage the lifetime of a local Java ByteBuffer
// reference, and provide accessors to its properties.
class ScopedJavaByteBuffer {
public:
explicit ScopedJavaByteBuffer(jobject j_byte_buffer)
: j_byte_buffer_(j_byte_buffer) {}
void* address() const {
return JniEnvExt::Get()->GetDirectBufferAddress(j_byte_buffer_.Get());
}
jint capacity() const {
return JniEnvExt::Get()->GetDirectBufferCapacity(j_byte_buffer_.Get());
}
bool IsNull() const { return !j_byte_buffer_ || !address(); }
void CopyInto(const void* source, jint count) {
SB_DCHECK(!IsNull());
SB_DCHECK(count >= 0 && count <= capacity());
memcpy(address(), source, count);
}
private:
ScopedLocalJavaRef<jobject> j_byte_buffer_;
ScopedJavaByteBuffer(const ScopedJavaByteBuffer&) = delete;
void operator=(const ScopedJavaByteBuffer&) = delete;
};
} // namespace shared
} // namespace android
} // namespace starboard
#endif // STARBOARD_ANDROID_SHARED_JNI_UTILS_H_