blob: a8c4b136dcf64bf960974840ed7ad1ded52c4146 [file] [log] [blame]
Paulo Casanova3497b262016-11-01 17:07:06 +00001/*
2 * Copyright (C) 2010 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17#ifndef SCOPED_UTF_CHARS_H_included
18#define SCOPED_UTF_CHARS_H_included
19
20#include <string.h>
21#include <jni.h>
22
23#include "android-base/logging.h"
24
25// This file was copied with some minor modifications from libnativehelper.
26// As soon as libnativehelper can be compiled for Windows, this file should be
27// replaced with libnativehelper's implementation.
28class ScopedUtfChars {
29 public:
30 ScopedUtfChars(JNIEnv* env, jstring s) : env_(env), string_(s) {
31 CHECK(s != nullptr);
32 utf_chars_ = env->GetStringUTFChars(s, nullptr);
33 }
34
35 ScopedUtfChars(ScopedUtfChars&& rhs) :
36 env_(rhs.env_), string_(rhs.string_), utf_chars_(rhs.utf_chars_) {
37 rhs.env_ = nullptr;
38 rhs.string_ = nullptr;
39 rhs.utf_chars_ = nullptr;
40 }
41
42 ~ScopedUtfChars() {
43 if (utf_chars_) {
44 env_->ReleaseStringUTFChars(string_, utf_chars_);
45 }
46 }
47
48 ScopedUtfChars& operator=(ScopedUtfChars&& rhs) {
49 if (this != &rhs) {
50 // Delete the currently owned UTF chars.
51 this->~ScopedUtfChars();
52
53 // Move the rhs ScopedUtfChars and zero it out.
54 env_ = rhs.env_;
55 string_ = rhs.string_;
56 utf_chars_ = rhs.utf_chars_;
57 rhs.env_ = nullptr;
58 rhs.string_ = nullptr;
59 rhs.utf_chars_ = nullptr;
60 }
61 return *this;
62 }
63
64 const char* c_str() const {
65 return utf_chars_;
66 }
67
68 size_t size() const {
69 return strlen(utf_chars_);
70 }
71
72 const char& operator[](size_t n) const {
73 return utf_chars_[n];
74 }
75
76 private:
77 JNIEnv* env_;
78 jstring string_;
79 const char* utf_chars_;
80
81 DISALLOW_COPY_AND_ASSIGN(ScopedUtfChars);
82};
83
84#endif // SCOPED_UTF_CHARS_H_included