1 // Copyright 2024 The Chromium Authors
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4 #include <jni.h>
5
6 #include <optional>
7 #include <string>
8
9 #include "base/android/jni_string.h"
10 #include "base/base_export.h"
11 #include "base/files/file_path.h"
12 #include "third_party/jni_zero/jni_zero.h"
13
14 namespace jni_zero {
15
16 template <>
FromJniType(JNIEnv * env,const JavaRef<jstring> & input)17 BASE_EXPORT std::string FromJniType<std::string, jstring>(
18 JNIEnv* env,
19 const JavaRef<jstring>& input) {
20 return base::android::ConvertJavaStringToUTF8(env, input);
21 }
22
23 template <>
ToJniType(JNIEnv * env,const std::string & input)24 BASE_EXPORT ScopedJavaLocalRef<jstring> ToJniType<std::string, jstring>(
25 JNIEnv* env,
26 const std::string& input) {
27 return base::android::ConvertUTF8ToJavaString(env, input);
28 }
29
30 template <>
ToJniType(JNIEnv * env,const char * const & input)31 BASE_EXPORT ScopedJavaLocalRef<jstring> ToJniType<const char*>(
32 JNIEnv* env,
33 const char* const& input) {
34 return base::android::ConvertUTF8ToJavaString(env, input);
35 }
36
37 template <>
FromJniType(JNIEnv * env,const JavaRef<jstring> & input)38 BASE_EXPORT std::u16string FromJniType<std::u16string, jstring>(
39 JNIEnv* env,
40 const JavaRef<jstring>& input) {
41 return base::android::ConvertJavaStringToUTF16(env, input);
42 }
43
44 template <>
ToJniType(JNIEnv * env,const std::u16string & input)45 BASE_EXPORT ScopedJavaLocalRef<jstring> ToJniType<std::u16string, jstring>(
46 JNIEnv* env,
47 const std::u16string& input) {
48 return base::android::ConvertUTF16ToJavaString(env, input);
49 }
50
51 template <>
ToJniType(JNIEnv * env,const std::u16string_view & input)52 BASE_EXPORT ScopedJavaLocalRef<jstring> ToJniType<std::u16string_view, jstring>(
53 JNIEnv* env,
54 const std::u16string_view& input) {
55 return base::android::ConvertUTF16ToJavaString(env, input);
56 }
57
58 template <>
FromJniType(JNIEnv * env,const JavaRef<jstring> & input)59 BASE_EXPORT base::FilePath FromJniType<base::FilePath, jstring>(
60 JNIEnv* env,
61 const JavaRef<jstring>& input) {
62 return base::FilePath(base::android::ConvertJavaStringToUTF8(env, input));
63 }
64
65 template <>
ToJniType(JNIEnv * env,const base::FilePath & input)66 BASE_EXPORT ScopedJavaLocalRef<jstring> ToJniType<base::FilePath, jstring>(
67 JNIEnv* env,
68 const base::FilePath& input) {
69 return base::android::ConvertUTF8ToJavaString(env, input.value());
70 }
71
72 // Specialized conversions for std::optional<std::basic_string<T>> since jstring
73 // is a nullable type but std::basic_string<T> is not.
74 template <>
75 BASE_EXPORT std::optional<std::string>
FromJniType(JNIEnv * env,const JavaRef<jstring> & j_string)76 FromJniType<std::optional<std::string>, jstring>(
77 JNIEnv* env,
78 const JavaRef<jstring>& j_string) {
79 if (!j_string) {
80 return std::nullopt;
81 }
82 return std::optional<std::string>(
83 FromJniType<std::string, jstring>(env, j_string));
84 }
85
86 template <>
87 BASE_EXPORT std::optional<std::u16string>
FromJniType(JNIEnv * env,const JavaRef<jstring> & j_string)88 FromJniType<std::optional<std::u16string>, jstring>(
89 JNIEnv* env,
90 const JavaRef<jstring>& j_string) {
91 if (!j_string) {
92 return std::nullopt;
93 }
94 return std::optional<std::u16string>(
95 FromJniType<std::u16string, jstring>(env, j_string));
96 }
97
98 } // namespace jni_zero
99