text: //=========================================================================
  // Copyright (C) 2012 The Elastos 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.
  //=========================================================================
  
  /*
   * Copyright (C) 2010 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.
   */
  
  #ifndef SCOPED_LOCAL_REF_H_included
  #define SCOPED_LOCAL_REF_H_included
  
  #include <stddef.h>
  
  // A smart pointer that deletes a JNI local reference when it goes out of scope.
  template<typename T>
  class ScopedLocalRef {
  public:
      ScopedLocalRef(T* localRef) : mLocalRef(localRef) {
      }
  
      ~ScopedLocalRef() {
          reset();
      }
  
      void reset(T* ptr = NULL) {
          if (ptr != mLocalRef) {
              if (mLocalRef != NULL) {
                  mLocalRef = NULL;
              }
              mLocalRef = ptr;
          }
      }
  
      AutoPtr<T> release() __attribute__((warn_unused_result)) {
          AutoPtr<T> localRef = mLocalRef;
          mLocalRef = NULL;
          return localRef;
      }
  
      AutoPtr<T> get() const {
          return mLocalRef;
      }
  
  private:
      AutoPtr<T> mLocalRef;
  
      // Disallow copy and assignment.
      ScopedLocalRef(const ScopedLocalRef&);
      void operator=(const ScopedLocalRef&);
  };
  
  #endif  // SCOPED_LOCAL_REF_H_included
  