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// Copyright (c) 2011 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef BASE_ANDROID_SCOPED_JAVA_GLOBAL_REFERENCE_H_
#define BASE_ANDROID_SCOPED_JAVA_GLOBAL_REFERENCE_H_
#include <jni.h>
#include <stddef.h>
#include "base/android/scoped_java_reference.h"
#include "base/basictypes.h"
namespace base {
namespace android {
// Holds a global reference to a Java object. The global reference is scoped
// to the lifetime of this object. Note that since a JNI Env is only suitable
// for use on a single thread, objects of this class must be created, used and
// destroyed on the same thread.
template<typename T>
class ScopedJavaGlobalReference {
public:
// Holds a NULL reference.
ScopedJavaGlobalReference()
: env_(NULL),
obj_(NULL) {
}
// Takes a new global reference to the Java object held by obj.
explicit ScopedJavaGlobalReference(const ScopedJavaReference<T>& obj)
: env_(obj.env()),
obj_(static_cast<T>(obj.env()->NewGlobalRef(obj.obj()))) {
}
~ScopedJavaGlobalReference() {
Reset();
}
void Reset() {
if (env_ && obj_)
env_->DeleteGlobalRef(obj_);
env_ = NULL;
obj_ = NULL;
}
void Reset(const ScopedJavaGlobalReference& other) {
Reset();
env_ = other.env_;
obj_ = other.env_ ? static_cast<T>(other.env_->NewGlobalRef(other.obj_)) :
NULL;
}
T obj() const { return obj_; }
private:
JNIEnv* env_;
T obj_;
DISALLOW_COPY_AND_ASSIGN(ScopedJavaGlobalReference);
};
} // namespace android
} // namespace base
#endif // BASE_ANDROID_SCOPED_JAVA_GLOBAL_REFERENCE_H_
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