64 lines
1.6 KiB
C++
64 lines
1.6 KiB
C++
/*
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* Copyright (C) 2010 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef SCOPED_LOCAL_REF_H_included
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#define SCOPED_LOCAL_REF_H_included
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#include "jni.h"
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#include <stddef.h>
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// A smart pointer that deletes a JNI local reference when it goes out of scope.
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template<typename T>
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class ScopedLocalRef {
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public:
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ScopedLocalRef(JNIEnv* env, T localRef) : mEnv(env), mLocalRef(localRef) {
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}
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~ScopedLocalRef() {
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reset();
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}
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void reset(T ptr = NULL) {
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if (ptr != mLocalRef) {
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if (mLocalRef != NULL) {
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mEnv->DeleteLocalRef(mLocalRef);
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}
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mLocalRef = ptr;
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}
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}
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T release() __attribute__((warn_unused_result)) {
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T localRef = mLocalRef;
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mLocalRef = NULL;
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return localRef;
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}
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T get() const {
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return mLocalRef;
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}
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private:
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JNIEnv* mEnv;
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T mLocalRef;
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// Disallow copy and assignment.
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ScopedLocalRef(const ScopedLocalRef&);
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void operator=(const ScopedLocalRef&);
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};
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#endif // SCOPED_LOCAL_REF_H_included
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