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/*
* Copyright (C) 2010 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_UTF_CHARS_H_included
#define SCOPED_UTF_CHARS_H_included
#include "JNIHelp.h"
#include <string.h>
// A smart pointer that provides read-only access to a Java string's UTF chars.
// Unlike GetStringUTFChars, we throw NullPointerException rather than abort if
// passed a null jstring, and c_str will return NULL.
// This makes the correct idiom very simple:
//
// ScopedUtfChars name(env, java_name);
// if (name.c_str() == NULL) {
// return NULL;
// }
class ScopedUtfChars {
public:
ScopedUtfChars(JNIEnv* env, jstring s) : env_(env), string_(s) {
if (s == NULL) {
utf_chars_ = NULL;
jniThrowNullPointerException(env, NULL);
} else {
utf_chars_ = env->GetStringUTFChars(s, NULL);
}
}
~ScopedUtfChars() {
if (utf_chars_) {
env_->ReleaseStringUTFChars(string_, utf_chars_);
}
}
const char* c_str() const {
return utf_chars_;
}
size_t size() const {
return strlen(utf_chars_);
}
const char& operator[](size_t n) const {
return utf_chars_[n];
}
private:
JNIEnv* env_;
jstring string_;
const char* utf_chars_;
// Disallow copy and assignment.
ScopedUtfChars(const ScopedUtfChars&);
void operator=(const ScopedUtfChars&);
};
#endif // SCOPED_UTF_CHARS_H_included
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