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1 /*
2  * Copyright (C) 2018 The Android Open Source Project
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  *      http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 
17 #ifndef LIBTEXTCLASSIFIER_UTILS_JAVA_JNI_CACHE_H_
18 #define LIBTEXTCLASSIFIER_UTILS_JAVA_JNI_CACHE_H_
19 
20 #include <jni.h>
21 
22 #include "utils/base/statusor.h"
23 #include "utils/java/jni-base.h"
24 #include "utils/strings/stringpiece.h"
25 #include "utils/utf8/unicodetext.h"
26 
27 namespace libtextclassifier3 {
28 
29 // A helper class to cache class and method pointers for calls from JNI to Java.
30 // (for implementations such as Java ICU that need to make calls from C++ to
31 // Java)
32 struct JniCache {
33   static std::unique_ptr<JniCache> Create(JNIEnv* env);
34 
35   JNIEnv* GetEnv() const;
36   bool ExceptionCheckAndClear() const;
37 
38   JavaVM* jvm = nullptr;
39 
40   // java.lang.String
41   ScopedGlobalRef<jclass> string_class;
42   jmethodID string_init_bytes_charset = nullptr;
43   jmethodID string_code_point_count = nullptr;
44   jmethodID string_length = nullptr;
45   ScopedGlobalRef<jstring> string_utf8;
46 
47   // java.util.regex.Pattern
48   ScopedGlobalRef<jclass> pattern_class;
49   jmethodID pattern_compile = nullptr;
50   jmethodID pattern_matcher = nullptr;
51 
52   // java.util.regex.Matcher
53   ScopedGlobalRef<jclass> matcher_class;
54   jmethodID matcher_matches = nullptr;
55   jmethodID matcher_find = nullptr;
56   jmethodID matcher_reset = nullptr;
57   jmethodID matcher_start_idx = nullptr;
58   jmethodID matcher_end_idx = nullptr;
59   jmethodID matcher_group = nullptr;
60   jmethodID matcher_group_idx = nullptr;
61 
62   // java.util.Locale
63   ScopedGlobalRef<jclass> locale_class;
64   ScopedGlobalRef<jobject> locale_us;
65   jmethodID locale_init_string = nullptr;
66   jmethodID locale_for_language_tag = nullptr;
67 
68   // java.text.BreakIterator
69   ScopedGlobalRef<jclass> breakiterator_class;
70   jmethodID breakiterator_getwordinstance = nullptr;
71   jmethodID breakiterator_settext = nullptr;
72   jmethodID breakiterator_next = nullptr;
73 
74   // java.lang.Integer
75   ScopedGlobalRef<jclass> integer_class;
76   jmethodID integer_parse_int = nullptr;
77 
78   // java.util.Calendar
79   ScopedGlobalRef<jclass> calendar_class;
80   jmethodID calendar_get_instance = nullptr;
81   jmethodID calendar_get_first_day_of_week = nullptr;
82   jmethodID calendar_get_time_in_millis = nullptr;
83   jmethodID calendar_set_time_in_millis = nullptr;
84   jmethodID calendar_add = nullptr;
85   jmethodID calendar_get = nullptr;
86   jmethodID calendar_set = nullptr;
87   jint calendar_zone_offset;
88   jint calendar_dst_offset;
89   jint calendar_year;
90   jint calendar_month;
91   jint calendar_day_of_year;
92   jint calendar_day_of_month;
93   jint calendar_day_of_week;
94   jint calendar_hour_of_day;
95   jint calendar_minute;
96   jint calendar_second;
97   jint calendar_millisecond;
98   jint calendar_sunday;
99   jint calendar_monday;
100   jint calendar_tuesday;
101   jint calendar_wednesday;
102   jint calendar_thursday;
103   jint calendar_friday;
104   jint calendar_saturday;
105 
106   // java.util.TimeZone
107   ScopedGlobalRef<jclass> timezone_class;
108   jmethodID timezone_get_timezone = nullptr;
109 
110   // java.net.URLEncoder
111   ScopedGlobalRef<jclass> urlencoder_class;
112   jmethodID urlencoder_encode = nullptr;
113 
114   // android.content.Context
115   ScopedGlobalRef<jclass> context_class;
116   jmethodID context_get_package_name = nullptr;
117   jmethodID context_get_system_service = nullptr;
118 
119   // android.net.Uri
120   ScopedGlobalRef<jclass> uri_class;
121   jmethodID uri_parse = nullptr;
122   jmethodID uri_get_scheme = nullptr;
123   jmethodID uri_get_host = nullptr;
124 
125   // android.os.UserManager
126   ScopedGlobalRef<jclass> usermanager_class;
127   jmethodID usermanager_get_user_restrictions = nullptr;
128 
129   // android.os.Bundle
130   ScopedGlobalRef<jclass> bundle_class;
131   jmethodID bundle_get_boolean = nullptr;
132 
133   // android.content.res.Resources
134   ScopedGlobalRef<jclass> resources_class;
135   jmethodID resources_get_system = nullptr;
136   jmethodID resources_get_identifier = nullptr;
137   jmethodID resources_get_string = nullptr;
138 
139   // Helper to convert lib3 UnicodeText to Java strings.
140   StatusOr<ScopedLocalRef<jstring>> ConvertToJavaString(
141       const char* utf8_text, const int utf8_text_size_bytes) const;
142   StatusOr<ScopedLocalRef<jstring>> ConvertToJavaString(
143       StringPiece utf8_text) const;
144   StatusOr<ScopedLocalRef<jstring>> ConvertToJavaString(
145       const UnicodeText& text) const;
146 
147  private:
148   explicit JniCache(JavaVM* jvm);
149 };
150 
151 }  // namespace libtextclassifier3
152 
153 #endif  // LIBTEXTCLASSIFIER_UTILS_JAVA_JNI_CACHE_H_
154