scoped_utf_chars.h revision 3f46c96568bef650ba6d9ce6ac8835d30877f243 
1/*
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 ART_TEST_TI_AGENT_SCOPED_UTF_CHARS_H_
18#define ART_TEST_TI_AGENT_SCOPED_UTF_CHARS_H_
19
20#include "jni.h"
21
22#include <string.h>
23
24#include "android-base/macros.h"
25
26namespace art {
27
28class ScopedUtfChars {
29 public:
30  ScopedUtfChars(JNIEnv* env, jstring s) : env_(env), string_(s) {
31    if (s == nullptr) {
32      utf_chars_ = nullptr;
33      // TODO: JniThrowNullPointerException(env, nullptr);
34    } else {
35      utf_chars_ = env->GetStringUTFChars(s, nullptr);
36    }
37  }
38
39  ScopedUtfChars(ScopedUtfChars&& rhs) :
40      env_(rhs.env_), string_(rhs.string_), utf_chars_(rhs.utf_chars_) {
41    rhs.env_ = nullptr;
42    rhs.string_ = nullptr;
43    rhs.utf_chars_ = nullptr;
44  }
45
46  ~ScopedUtfChars() {
47    if (utf_chars_) {
48      env_->ReleaseStringUTFChars(string_, utf_chars_);
49    }
50  }
51
52  ScopedUtfChars& operator=(ScopedUtfChars&& rhs) {
53    if (this != &rhs) {
54      // Delete the currently owned UTF chars.
55      this->~ScopedUtfChars();
56
57      // Move the rhs ScopedUtfChars and zero it out.
58      env_ = rhs.env_;
59      string_ = rhs.string_;
60      utf_chars_ = rhs.utf_chars_;
61      rhs.env_ = nullptr;
62      rhs.string_ = nullptr;
63      rhs.utf_chars_ = nullptr;
64    }
65    return *this;
66  }
67
68  const char* c_str() const {
69    return utf_chars_;
70  }
71
72  size_t size() const {
73    return strlen(utf_chars_);
74  }
75
76  const char& operator[](size_t n) const {
77    return utf_chars_[n];
78  }
79
80 private:
81  JNIEnv* env_;
82  jstring string_;
83  const char* utf_chars_;
84
85  DISALLOW_COPY_AND_ASSIGN(ScopedUtfChars);
86};
87
88}  // namespace art
89
90#endif  // ART_TEST_TI_AGENT_SCOPED_UTF_CHARS_H_
91