/*
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* Copyright (C) 2018 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "utils/java/string_utils.h"
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#include "utils/base/logging.h"
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namespace libtextclassifier3 {
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bool JByteArrayToString(JNIEnv* env, const jbyteArray& array,
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std::string* result) {
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jbyte* const array_bytes = env->GetByteArrayElements(array, JNI_FALSE);
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if (array_bytes == nullptr) {
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return false;
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}
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const int array_length = env->GetArrayLength(array);
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*result = std::string(reinterpret_cast<char*>(array_bytes), array_length);
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env->ReleaseByteArrayElements(array, array_bytes, JNI_ABORT);
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return true;
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}
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bool JStringToUtf8String(JNIEnv* env, const jstring& jstr,
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std::string* result) {
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if (jstr == nullptr) {
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*result = std::string();
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return false;
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}
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jclass string_class = env->FindClass("java/lang/String");
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if (!string_class) {
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TC3_LOG(ERROR) << "Can't find String class";
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return false;
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}
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jmethodID get_bytes_id =
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env->GetMethodID(string_class, "getBytes", "(Ljava/lang/String;)[B");
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jstring encoding = env->NewStringUTF("UTF-8");
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jbyteArray array = reinterpret_cast<jbyteArray>(
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env->CallObjectMethod(jstr, get_bytes_id, encoding));
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JByteArrayToString(env, array, result);
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// Release the array.
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env->DeleteLocalRef(array);
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env->DeleteLocalRef(string_class);
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env->DeleteLocalRef(encoding);
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return true;
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}
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ScopedStringChars GetScopedStringChars(JNIEnv* env, jstring string,
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jboolean* is_copy) {
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return ScopedStringChars(env->GetStringUTFChars(string, is_copy),
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StringCharsReleaser(env, string));
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}
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} // namespace libtextclassifier3
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