| /* |
| * Copyright (C) 2011 The Android Open Source Project |
| * |
| * 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 SCOPED_STRING_CHARS_H_included |
| #define SCOPED_STRING_CHARS_H_included |
| |
| #include "JNIHelp.h" |
| |
| // A smart pointer that provides access to a jchar* given a JNI jstring. |
| // Unlike GetStringChars, we throw NullPointerException rather than abort if |
| // passed a null jstring, and get will return NULL. |
| // This makes the correct idiom very simple: |
| // |
| // ScopedStringChars name(env, java_name); |
| // if (name.get() == NULL) { |
| // return NULL; |
| // } |
| class ScopedStringChars { |
| public: |
| ScopedStringChars(JNIEnv* env, jstring s) : env_(env), string_(s), size_(0) { |
| if (s == NULL) { |
| chars_ = NULL; |
| jniThrowNullPointerException(env, NULL); |
| } else { |
| chars_ = env->GetStringChars(string_, NULL); |
| if (chars_ != NULL) { |
| size_ = env->GetStringLength(string_); |
| } |
| } |
| } |
| |
| ~ScopedStringChars() { |
| if (chars_ != NULL) { |
| env_->ReleaseStringChars(string_, chars_); |
| } |
| } |
| |
| const jchar* get() const { |
| return chars_; |
| } |
| |
| size_t size() const { |
| return size_; |
| } |
| |
| const jchar& operator[](size_t n) const { |
| return chars_[n]; |
| } |
| |
| private: |
| JNIEnv* env_; |
| jstring string_; |
| const jchar* chars_; |
| size_t size_; |
| |
| // Disallow copy and assignment. |
| ScopedStringChars(const ScopedStringChars&); |
| void operator=(const ScopedStringChars&); |
| }; |
| |
| #endif // SCOPED_STRING_CHARS_H_included |