134 lines
3.6 KiB
C++
134 lines
3.6 KiB
C++
/*
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* Copyright 2010-2021 Max Kellermann <max.kellermann@gmail.com>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* - Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* - Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the
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* distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* FOUNDATION OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef JAVA_STRING_HXX
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#define JAVA_STRING_HXX
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#include "Ref.hxx"
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#include <jni.h>
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#include <cstddef>
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#include <string>
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#include <string_view>
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namespace Java {
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class StringUTFChars {
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JNIEnv *env;
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jstring string;
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const char *chars = nullptr;
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public:
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StringUTFChars() noexcept = default;
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StringUTFChars(std::nullptr_t) noexcept {}
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StringUTFChars(JNIEnv *_env,
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const jstring _string,
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const char *const _chars) noexcept
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:env(_env), string(_string), chars(_chars) {}
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StringUTFChars(StringUTFChars &&src) noexcept
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:env(src.env), string(src.string),
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chars(std::exchange(src.chars, nullptr)) {}
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~StringUTFChars() noexcept {
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if (chars != nullptr)
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env->ReleaseStringUTFChars(string, chars);
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}
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StringUTFChars &operator=(StringUTFChars &&src) noexcept {
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using std::swap;
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swap(env, src.env);
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swap(string, src.string);
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swap(chars, src.chars);
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return *this;
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}
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const char *c_str() const noexcept {
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return chars;
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}
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operator bool() const noexcept {
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return chars != nullptr;
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}
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};
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/**
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* Wrapper for a local "jstring" reference.
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*/
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class String : public LocalRef<jstring> {
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public:
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using LocalRef::LocalRef;
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String(JNIEnv *_env, const char *_value) noexcept
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:LocalRef<jstring>(_env, _env->NewStringUTF(_value)) {}
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String(JNIEnv *_env, std::string_view _value) noexcept;
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static StringUTFChars GetUTFChars(JNIEnv *env, jstring s) noexcept {
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return {env, s, env->GetStringUTFChars(s, nullptr)};
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}
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StringUTFChars GetUTFChars() const noexcept {
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return GetUTFChars(GetEnv(), Get());
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}
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/**
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* Copy the value to the specified buffer. Truncates
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* the value if it does not fit into the buffer.
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*
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* @return a pointer to the terminating null byte,
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* nullptr on error
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*/
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static char *CopyTo(JNIEnv *env, jstring value,
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char *buffer, size_t max_size) noexcept;
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/**
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* Copy the value to the specified buffer. Truncates
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* the value if it does not fit into the buffer.
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*
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* @return a pointer to the terminating null byte,
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* nullptr on error
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*/
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char *CopyTo(char *buffer, size_t max_size) const noexcept {
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return CopyTo(GetEnv(), Get(), buffer, max_size);
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}
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static std::string ToString(JNIEnv *env, jstring s) noexcept;
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std::string ToString() const noexcept {
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return ToString(GetEnv(), Get());
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}
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};
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} // namespace Java
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#endif
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