jni_weak_ref.cc

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// Copyright 2013 The Flutter Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
 
#include "flutter/fml/platform/android/jni_weak_ref.h"
 
#include "flutter/fml/logging.h"
#include "flutter/fml/platform/android/jni_util.h"
 
namespace fml {
namespace jni {
 
JavaObjectWeakGlobalRef::JavaObjectWeakGlobalRef() : obj_(NULL) {}
 
JavaObjectWeakGlobalRef::JavaObjectWeakGlobalRef(
    const JavaObjectWeakGlobalRef& orig)
    : obj_(NULL) {
  Assign(orig);
}
 
JavaObjectWeakGlobalRef::JavaObjectWeakGlobalRef(JNIEnv* env, jobject obj)
    : obj_(env->NewWeakGlobalRef(obj)) {
  FML_DCHECK(obj_);
}
 
JavaObjectWeakGlobalRef::~JavaObjectWeakGlobalRef() {
  reset();
}
 
void JavaObjectWeakGlobalRef::operator=(const JavaObjectWeakGlobalRef& rhs) {
  Assign(rhs);
}
 
void JavaObjectWeakGlobalRef::reset() {
  if (obj_) {
    AttachCurrentThread()->DeleteWeakGlobalRef(obj_);
    obj_ = NULL;
  }
}
 
ScopedJavaLocalRef<jobject> JavaObjectWeakGlobalRef::get(JNIEnv* env) const {
  return GetRealObject(env, obj_);
}
 
ScopedJavaLocalRef<jobject> GetRealObject(JNIEnv* env, jweak obj) {
  jobject real = NULL;
  if (obj) {
    real = env->NewLocalRef(obj);
    if (!real) {
      FML_DLOG(ERROR) << "The real object has been deleted!";
    }
  }
  return ScopedJavaLocalRef<jobject>(env, real);
}
 
void JavaObjectWeakGlobalRef::Assign(const JavaObjectWeakGlobalRef& other) {
  if (&other == this) {
    return;
  }
 
  JNIEnv* env = AttachCurrentThread();
  if (obj_) {
    env->DeleteWeakGlobalRef(obj_);
  }
 
  obj_ = other.obj_ ? env->NewWeakGlobalRef(other.obj_) : NULL;
}
 
}  // namespace jni
}  // namespace fml