Add JNI binding

Author: mike-evolved

java/rocksjni/ribbon_filter.cc

@@ -0,0 +1,26 @@
+// Copyright (c) 2011-present, Facebook, Inc.  All rights reserved.
+// This source code is licensed under both the GPLv2 (found in the
+// COPYING file in the root directory) and Apache 2.0 License
+// (found in the LICENSE.Apache file in the root directory).
+
+#include <jni.h>
+
+#include "include/org_rocksdb_RibbonFilter.h"
+#include "rocksdb/filter_policy.h"
+#include "rocksjni/cplusplus_to_java_convert.h"
+
+/*
+ * Class:     org_rocksdb_RibbonFilter
+ * Method:    createNewRibbonFilter
+ * Signature: (DI)J
+ */
+jlong Java_org_rocksdb_RibbonFilter_createNewRibbonFilter(
+    JNIEnv* /*env*/, jclass /*jcls*/, jdouble jbits_per_key,
+    jint jbloom_before_level) {
+  auto* filter_policy =
+      new std::shared_ptr<const ROCKSDB_NAMESPACE::FilterPolicy>(
+          ROCKSDB_NAMESPACE::NewRibbonFilterPolicy(
+              static_cast<double>(jbits_per_key),
+              static_cast<int>(jbloom_before_level)));
+  return GET_CPLUSPLUS_POINTER(filter_policy);
+}