chore: import upstream snapshot with attribution

tensorflow/lite/c/jni/BUILD

@@ -0,0 +1,22 @@
+load("//tensorflow/lite:special_rules.bzl", "tflite_portable_test_suite")
+load("//tensorflow/lite/core/shims:cc_library_with_tflite.bzl", "cc_library_with_tflite_with_c_headers_test")
+
+package(
+    # copybara:uncomment default_applicable_licenses = ["//tensorflow:LICENSE"],
+    licenses = ["notice"],
+)
+
+#------------------------------------------------------------------------------
+# Utilities for use in JNI Bindings (e.g. Java API and Java Tasks library).
+
+cc_library_with_tflite_with_c_headers_test(
+    name = "jni_utils",
+    srcs = ["jni_utils.cc"],
+    hdrs = ["jni_utils.h"],
+    visibility = ["//visibility:public"],
+    deps = [
+        "//tensorflow/lite/java/jni",
+    ],
+)
+
+tflite_portable_test_suite()

tensorflow/lite/c/jni/jni_utils.cc

@@ -0,0 +1,20 @@
+/* Copyright 2021 The TensorFlow Authors. All Rights Reserved.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+==============================================================================*/
+#include "tensorflow/lite/c/jni/jni_utils.h"
+
+bool TfLiteCheckInitializedOrThrow(JNIEnv* env) {
+  // No additional initialization is required.
+  return true;
+}

tensorflow/lite/c/jni/jni_utils.h

@@ -0,0 +1,39 @@
+/* Copyright 2021 The TensorFlow Authors. All Rights Reserved.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+==============================================================================*/
+#ifndef TENSORFLOW_LITE_JNI_JNI_UTILS_H_
+#define TENSORFLOW_LITE_JNI_JNI_UTILS_H_
+
+#include <jni.h>
+#include <stdbool.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/// Checks whether the TFLite API has been initialized, throwing a Java exception
+/// otherwise.
+///
+/// @param env The JNIEnv for the current thread (which has to be attached to the
+///     JVM).
+/// @return Whether or not the TFLite API has been initialized. If this method
+///   returns false, no other JNI method should be called until the pending
+///   exception has been handled (typically by returning to Java).
+bool TfLiteCheckInitializedOrThrow(JNIEnv* env);
+
+#ifdef __cplusplus
+}  // extern "C"
+#endif
+
+#endif  // TENSORFLOW_LITE_JNI_JNI_UTILS_H_