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// Copyright (C) 2022 Google LLC
//
// 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 ICING_JNI_SCOPED_UTF_CHARS_H_
#define ICING_JNI_SCOPED_UTF_CHARS_H_
#include <jni.h>
#include <cstddef>
#include <cstring>
#include <utility>
namespace icing {
namespace lib {
// An RAII class to manage access and allocation of a Java string's UTF chars.
class ScopedUtfChars {
public:
ScopedUtfChars(JNIEnv* env, jstring s) : env_(env), string_(s) {
if (s == nullptr) {
utf_chars_ = nullptr;
size_ = 0;
} else {
utf_chars_ = env->GetStringUTFChars(s, /*isCopy=*/nullptr);
size_ = strlen(utf_chars_);
}
}
ScopedUtfChars(ScopedUtfChars&& rhs)
: env_(nullptr), string_(nullptr), utf_chars_(nullptr) {
Swap(rhs);
}
ScopedUtfChars(const ScopedUtfChars&) = delete;
ScopedUtfChars& operator=(ScopedUtfChars&& rhs) {
Swap(rhs);
return *this;
}
ScopedUtfChars& operator=(const ScopedUtfChars&) = delete;
~ScopedUtfChars() {
if (utf_chars_ != nullptr) {
env_->ReleaseStringUTFChars(string_, utf_chars_);
}
}
const char* c_str() const { return utf_chars_; }
size_t size() const { return size_; }
private:
void Swap(ScopedUtfChars& other) {
std::swap(env_, other.env_);
std::swap(string_, other.string_);
std::swap(utf_chars_, other.utf_chars_);
std::swap(size_, other.size_);
}
JNIEnv* env_;
jstring string_;
const char* utf_chars_;
size_t size_;
};
} // namespace lib
} // namespace icing
#endif // ICING_JNI_SCOPED_UTF_CHARS_H_
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