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75 lines
1.8 KiB
75 lines
1.8 KiB
/*
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* Copyright (C) 2011 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 <jni.h>
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#include "nativehelper_utils.h"
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// A smart pointer that provides access to a jchar* given a JNI jstring.
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// Unlike GetStringChars, we throw NullPointerException rather than abort if
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// passed a null jstring, and get will return nullptr.
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// This makes the correct idiom very simple:
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//
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// ScopedStringChars name(env, java_name);
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// if (name.get() == nullptr) {
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// return nullptr;
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// }
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class ScopedStringChars {
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public:
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ScopedStringChars(JNIEnv* env, jstring s) : env_(env), string_(s), size_(0) {
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if (s == nullptr) {
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chars_ = nullptr;
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jniThrowNullPointerException(env);
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} else {
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chars_ = env->GetStringChars(string_, nullptr);
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if (chars_ != nullptr) {
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size_ = env->GetStringLength(string_);
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}
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}
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}
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~ScopedStringChars() {
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if (chars_ != nullptr) {
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env_->ReleaseStringChars(string_, chars_);
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}
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}
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const jchar* get() const {
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return chars_;
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}
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size_t size() const {
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return size_;
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}
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const jchar& operator[](size_t n) const {
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return chars_[n];
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}
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private:
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JNIEnv* const env_;
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const jstring string_;
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const jchar* chars_;
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size_t size_;
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DISALLOW_COPY_AND_ASSIGN(ScopedStringChars);
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};
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