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      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 
     26 #include "jni_helper.h"
     27 
     28 namespace art {
     29 
     30 class ScopedUtfChars {
     31  public:
     32   ScopedUtfChars(JNIEnv* env, jstring s) : env_(env), string_(s) {
     33     if (s == nullptr) {
     34       utf_chars_ = nullptr;
     35       JniThrowNullPointerException(env, nullptr);
     36     } else {
     37       utf_chars_ = env->GetStringUTFChars(s, nullptr);
     38     }
     39   }
     40 
     41   ScopedUtfChars(ScopedUtfChars&& rhs) :
     42       env_(rhs.env_), string_(rhs.string_), utf_chars_(rhs.utf_chars_) {
     43     rhs.env_ = nullptr;
     44     rhs.string_ = nullptr;
     45     rhs.utf_chars_ = nullptr;
     46   }
     47 
     48   ~ScopedUtfChars() {
     49     if (utf_chars_) {
     50       env_->ReleaseStringUTFChars(string_, utf_chars_);
     51     }
     52   }
     53 
     54   ScopedUtfChars& operator=(ScopedUtfChars&& rhs) {
     55     if (this != &rhs) {
     56       // Delete the currently owned UTF chars.
     57       this->~ScopedUtfChars();
     58 
     59       // Move the rhs ScopedUtfChars and zero it out.
     60       env_ = rhs.env_;
     61       string_ = rhs.string_;
     62       utf_chars_ = rhs.utf_chars_;
     63       rhs.env_ = nullptr;
     64       rhs.string_ = nullptr;
     65       rhs.utf_chars_ = nullptr;
     66     }
     67     return *this;
     68   }
     69 
     70   const char* c_str() const {
     71     return utf_chars_;
     72   }
     73 
     74   size_t size() const {
     75     return strlen(utf_chars_);
     76   }
     77 
     78   const char& operator[](size_t n) const {
     79     return utf_chars_[n];
     80   }
     81 
     82  private:
     83   JNIEnv* env_;
     84   jstring string_;
     85   const char* utf_chars_;
     86 
     87   DISALLOW_COPY_AND_ASSIGN(ScopedUtfChars);
     88 };
     89 
     90 }  // namespace art
     91 
     92 #endif  // ART_TEST_TI_AGENT_SCOPED_UTF_CHARS_H_
     93