[jnigen] JniX to JX rename (#126)

Closed #124.
Closed #125.

* Added `JPrimitive` and its subclasses instead of using the typedefs from `ffi` directly.
* Renamed `JniObject`, `JniString`, and ... to the shorter `JObject`, JString`, and ...
* Made tests more robust by deleting the objects in an arena.

Author: HosseinYousefi

pkgs/jni/example/integration_test/on_device_jni_test.dart

@@ -22,7 +22,7 @@ void main() {
     }
   }
 
-  testWidgets("Long.intValue() using JniObject", (t) async {
+  testWidgets("Long.intValue() using JObject", (t) async {
     final longClass = Jni.findJniClass("java/lang/Long");
 
     final longCtor = longClass.getCtorID("(J)V");
@@ -38,7 +38,7 @@ void main() {
 
   testWidgets("call a static method using JniClass APIs", (t) async {
     final integerClass = JniClass.fromRef(Jni.findClass("java/lang/Integer"));
-    final result = integerClass.callStaticMethodByName<JniString>(
+    final result = integerClass.callStaticMethodByName<JString>(
         "toHexString", "(I)Ljava/lang/String;", [31]);
 
     final resultString = result.toDartString();
@@ -116,7 +116,7 @@ void main() {
   });
 
   testWidgets("enums", (t) async {
-    final ordinal = Jni.retrieveStaticField<JniObject>(
+    final ordinal = Jni.retrieveStaticField<JObject>(
             "java/net/Proxy\$Type", "HTTP", "Ljava/net/Proxy\$Type;")
         .use((f) => f.callMethodByName<int>("ordinal", "()I", []));
     expect(ordinal, equals(1));

pkgs/jni/example/lib/main.dart

@@ -15,7 +15,7 @@ import 'package:jni/jni.dart';
 // GlobalJniEnv is a thin abstraction over JNIEnv in JNI C API.
 //
 // For a more ergonomic API for common use cases of calling methods and
-// accessing fields, see next examples using JniObject and JniClass.
+// accessing fields, see next examples using JObject and JniClass.
 String toJavaStringUsingEnv(int n) => using((arena) {
       final env = Jni.env;
       final cls = env.FindClass("java/lang/String".toNativeChars(arena));
@@ -56,7 +56,7 @@ int uptime() {
 }
 
 void quit() {
-  JniObject.fromRef(Jni.getCurrentActivity())
+  JObject.fromRef(Jni.getCurrentActivity())
       .use((ac) => ac.callMethodByName<void>("finish", "()V", []));
 }
 
@@ -68,7 +68,7 @@ void showToast(String text) {
   // In this example, Toaster class wraps android.widget.Toast so that it
   // can be called from any thread. See
   // android/app/src/main/java/com/github/dart_lang/jni_example/Toaster.java
-  Jni.invokeStaticMethod<JniObject>(
+  Jni.invokeStaticMethod<JObject>(
       "com/github/dart_lang/jni_example/Toaster",
       "makeText",
       "(Landroid/app/Activity;Landroid/content/Context;"
@@ -100,7 +100,7 @@ void main() {
               "android/os/Build", "DEVICE", "Ljava/lang/String;")),
       Example(
         "Package name",
-        () => JniObject.fromRef(Jni.getCurrentActivity()).use((activity) =>
+        () => JObject.fromRef(Jni.getCurrentActivity()).use((activity) =>
             activity.callMethodByName<String>(
                 "getPackageName", "()Ljava/lang/String;", [])),
       ),

pkgs/jni/ffigen.yaml

@@ -55,32 +55,34 @@ typedefs:
     - '__builtin_va_list'
   rename:
     'JNI(.*)': 'Jni$1'
-    'jint': 'JInt'
-    'jclass': 'JClass'
-    'jobject': 'JObject'
-    'jbyte': 'JByte'
-    'jsize': 'JSize'
-    'jmethodID': 'JMethodID'
-    'jfieldID': 'JFieldID'
-    'jboolean': 'JBoolean'
-    'jthrowable': 'JThrowable'
-    'jchar': 'JChar'
-    'jshort': 'JShort'
-    'jlong': 'JLong'
-    'jfloat': 'JFloat'
-    'jdouble': 'JDouble'
-    'jstring': 'JString'
-    'jarray': 'JArray'
-    'jobjectArray': 'JObjectArray'
-    'jbooleanArray': 'JBooleanArray'
-    'jbyteArray': 'JByteArray'
-    'jcharArray': 'JCharArray'
-    'jshortArray': 'JShortArray'
-    'jintArray': 'JIntArray'
-    'jlongArray': 'JLongArray'
-    'jfloatArray': 'JFloatArray'
-    'jdoubleArray': 'JDoubleArray'
-    'jweak': 'JWeak'
+    # Primitives
+    'jbyte': 'JByteMarker'
+    'jboolean': 'JBooleanMarker'
+    'jchar': 'JCharMarker'
+    'jshort': 'JShortMarker'
+    'jint': 'JIntMarker'
+    'jlong': 'JLongMarker'
+    'jfloat': 'JFloatMarker'
+    'jdouble': 'JDoubleMarker'
+    'jsize': 'JSizeMarker'
+
+    'jclass': 'JClassPtr'
+    'jobject': 'JObjectPtr'
+    'jmethodID': 'JMethodIDPtr'
+    'jfieldID': 'JFieldIDPtr'
+    'jthrowable': 'JThrowablePtr'
+    'jstring': 'JStringPtr'
+    'jarray': 'JArrayPtr'
+    'jobjectArray': 'JObjectArrayPtr'
+    'jbooleanArray': 'JBooleanArrayPtr'
+    'jbyteArray': 'JByteArrayPtr'
+    'jcharArray': 'JCharArrayPtr'
+    'jshortArray': 'JShortArrayPtr'
+    'jintArray': 'JIntArrayPtr'
+    'jlongArray': 'JLongArrayPtr'
+    'jfloatArray': 'JFloatArrayPtr'
+    'jdoubleArray': 'JDoubleArrayPtr'
+    'jweak': 'JWeakPtr'
     'jvalue': 'JValue'
 preamble: |
   // Autogenerated file. Do not edit.

pkgs/jni/lib/internal_helpers_for_jnigen.dart

@@ -7,5 +7,5 @@
 library internal_helpers_for_jnigen;
 
 export 'src/jni.dart' show ProtectedJniExtensions;
-export 'src/jni_object.dart' show JniReference;
+export 'src/types.dart' show JReference;
 export 'src/accessors.dart';

pkgs/jni/lib/jni.dart

@@ -64,8 +64,7 @@ export 'src/third_party/jni_bindings_generated.dart'
     hide JniBindings, JniEnv, JniEnv1, JniExceptionDetails;
 export 'src/jni.dart' hide ProtectedJniExtensions;
 export 'src/jvalues.dart' hide JValueArgs, toJValues;
-export 'src/jni_exceptions.dart';
-export 'src/jni_object.dart' hide JniReference;
+export 'src/types.dart' hide JReference;
 
 export 'package:ffi/ffi.dart' show using, Arena;
 export 'dart:ffi' show nullptr;

pkgs/jni/lib/src/accessors.dart

@@ -9,9 +9,9 @@ import 'package:jni/src/jvalues.dart';
 
 import 'third_party/jni_bindings_generated.dart';
 import 'jni.dart';
-import 'jni_exceptions.dart';
+import 'types.dart';
 
-void _check(JThrowable exception) {
+void _check(JThrowablePtr exception) {
   if (exception != nullptr) {
     Jni.accessors.throwException(exception);
   }
@@ -55,7 +55,7 @@ extension JniResultMethods on JniResult {
     return result.d;
   }
 
-  JObject get object {
+  JObjectPtr get object {
     check();
     return result.l;
   }
@@ -67,12 +67,12 @@ extension JniResultMethods on JniResult {
 }
 
 extension JniIdLookupResultMethods on JniPointerResult {
-  JMethodID get methodID {
+  JMethodIDPtr get methodID {
     _check(exception);
     return id.cast<jmethodID_>();
   }
 
-  JFieldID get fieldID {
+  JFieldIDPtr get fieldID {
     _check(exception);
     return id.cast<jfieldID_>();
   }
@@ -84,7 +84,7 @@ extension JniIdLookupResultMethods on JniPointerResult {
 }
 
 extension JniClassLookupResultMethods on JniClassLookupResult {
-  JClass get checkedClassRef {
+  JClassPtr get checkedClassRef {
     _check(exception);
     return classRef;
   }
@@ -95,7 +95,7 @@ extension JniAccessorWrappers on Pointer<JniAccessors> {
   ///
   /// The original exception object is deleted by this method. The message
   /// and Java stack trace are included in the exception.
-  void throwException(JThrowable exception) {
+  void throwException(JThrowablePtr exception) {
     final details = getExceptionDetails(exception);
     final env = Jni.env;
     final message = env.asDartString(details.message);
@@ -108,42 +108,45 @@ extension JniAccessorWrappers on Pointer<JniAccessors> {
 
   // TODO(PR): How to name these methods? These only wrap toNativeChars()
   // so that generated bindings are less verbose.
-  JClass getClassOf(String internalName) =>
+  JClassPtr getClassOf(String internalName) =>
       using((arena) => getClass(internalName.toNativeChars(arena)))
           .checkedClassRef;
 
-  JMethodID getMethodIDOf(JClass cls, String name, String signature) =>
+  JMethodIDPtr getMethodIDOf(JClassPtr cls, String name, String signature) =>
       using((arena) => getMethodID(
               cls, name.toNativeChars(arena), signature.toNativeChars(arena)))
           .methodID;
 
-  JMethodID getStaticMethodIDOf(JClass cls, String name, String signature) =>
+  JMethodIDPtr getStaticMethodIDOf(
+          JClassPtr cls, String name, String signature) =>
       using((arena) => getStaticMethodID(
               cls, name.toNativeChars(arena), signature.toNativeChars(arena)))
           .methodID;
 
-  JFieldID getFieldIDOf(JClass cls, String name, String signature) =>
+  JFieldIDPtr getFieldIDOf(JClassPtr cls, String name, String signature) =>
       using((arena) => getFieldID(
               cls, name.toNativeChars(arena), signature.toNativeChars(arena)))
           .fieldID;
 
-  JFieldID getStaticFieldIDOf(JClass cls, String name, String signature) =>
+  JFieldIDPtr getStaticFieldIDOf(
+          JClassPtr cls, String name, String signature) =>
       using((arena) => getStaticFieldID(
               cls, name.toNativeChars(arena), signature.toNativeChars(arena)))
           .fieldID;
 
-  JniResult newObjectWithArgs(JClass cls, JMethodID ctor, List<dynamic> args) =>
+  JniResult newObjectWithArgs(
+          JClassPtr cls, JMethodIDPtr ctor, List<dynamic> args) =>
       using((arena) {
         return newObject(cls, ctor, toJValues(args, allocator: arena));
       });
 
   JniResult callMethodWithArgs(
-          JObject obj, JMethodID id, int callType, List<dynamic> args) =>
+          JObjectPtr obj, JMethodIDPtr id, int callType, List<dynamic> args) =>
       using((arena) =>
           callMethod(obj, id, callType, toJValues(args, allocator: arena)));
 
   JniResult callStaticMethodWithArgs(
-          JClass cls, JMethodID id, int callType, List<dynamic> args) =>
+          JClassPtr cls, JMethodIDPtr id, int callType, List<dynamic> args) =>
       using((arena) => callStaticMethod(
           cls, id, callType, toJValues(args, allocator: arena)));
 }