pkgs/jni/lib/src/jni_exceptions.dart

import 'dart:ffi';

import 'third_party/jni_bindings_generated.dart';

class UseAfterFreeException implements Exception {
  dynamic object;
  Pointer<Void> ptr;
  UseAfterFreeException(this.object, this.ptr);

  @override
  String toString() {
    return "use after free on $ptr through $object";
  }
}

class DoubleFreeException implements Exception {
  dynamic object;
  Pointer<Void> ptr;
  DoubleFreeException(this.object, this.ptr);

  @override
  String toString() {
    return "double on $ptr through $object";
  }
}

class JniException implements Exception {
  /// Exception object pointer from JNI.
  final JObject err;

  /// brief description, usually initialized with error message from Java.
  final String msg;
  JniException(this.err, this.msg);

  @override
  String toString() => msg;

  void deleteIn(Pointer<JniEnv> env) => env.DeleteLocalRef(err);
}

class HelperNotFoundException implements Exception {
  HelperNotFoundException(this.path);
  final String path;

  @override
  String toString() => "Lookup for helper library $path failed.\n"
      "Please ensure that `dartjni` shared library is built.\n"
      "If the library is already built, double check the path.";
}