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95 lines
2.4 KiB
95 lines
2.4 KiB
4 months ago
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/*
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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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#pragma once
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#include <stddef.h>
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#include <string.h>
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#include <jni.h>
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#include "nativehelper_utils.h"
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// A smart pointer that provides read-only access to a Java string's UTF chars.
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// Unlike GetStringUTFChars, we throw NullPointerException rather than abort if
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// passed a null jstring, and c_str will return nullptr.
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// This makes the correct idiom very simple:
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//
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// ScopedUtfChars name(env, java_name);
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// if (name.c_str() == nullptr) {
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// return nullptr;
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// }
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class ScopedUtfChars {
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public:
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ScopedUtfChars(JNIEnv* env, jstring s) : env_(env), string_(s) {
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if (s == nullptr) {
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utf_chars_ = nullptr;
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jniThrowNullPointerException(env);
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} else {
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utf_chars_ = env->GetStringUTFChars(s, nullptr);
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}
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}
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ScopedUtfChars(ScopedUtfChars&& rhs) noexcept :
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env_(rhs.env_), string_(rhs.string_), utf_chars_(rhs.utf_chars_) {
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rhs.env_ = nullptr;
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rhs.string_ = nullptr;
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rhs.utf_chars_ = nullptr;
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}
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~ScopedUtfChars() {
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if (utf_chars_) {
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env_->ReleaseStringUTFChars(string_, utf_chars_);
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}
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}
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ScopedUtfChars& operator=(ScopedUtfChars&& rhs) noexcept {
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if (this != &rhs) {
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// Delete the currently owned UTF chars.
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this->~ScopedUtfChars();
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// Move the rhs ScopedUtfChars and zero it out.
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env_ = rhs.env_;
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string_ = rhs.string_;
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utf_chars_ = rhs.utf_chars_;
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rhs.env_ = nullptr;
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rhs.string_ = nullptr;
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rhs.utf_chars_ = nullptr;
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}
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return *this;
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}
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const char* c_str() const {
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return utf_chars_;
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}
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size_t size() const {
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return strlen(utf_chars_);
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}
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const char& operator[](size_t n) const {
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return utf_chars_[n];
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}
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private:
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JNIEnv* env_;
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jstring string_;
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const char* utf_chars_;
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DISALLOW_COPY_AND_ASSIGN(ScopedUtfChars);
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};
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