Java facility to use the RemoveEmptyValueCompactionFilter

java/Makefile

@@ -24,6 +24,7 @@ NATIVE_JAVA_CLASSES = org.rocksdb.AbstractCompactionFilter\
 	org.rocksdb.Options\
 	org.rocksdb.PlainTableConfig\
 	org.rocksdb.ReadOptions\
+	org.rocksdb.RemoveEmptyValueCompactionFilter\
 	org.rocksdb.RestoreBackupableDB\
 	org.rocksdb.RestoreOptions\
 	org.rocksdb.RocksDB\

java/rocksjni/remove_emptyvalue_compactionfilterjni.cc

@@ -0,0 +1,27 @@
+// Copyright (c) 2015, Facebook, Inc.  All rights reserved.
+// This source code is licensed under the BSD-style license found in the
+// LICENSE file in the root directory of this source tree. An additional grant
+// of patent rights can be found in the PATENTS file in the same directory.
+
+#include <jni.h>
+
+#include "include/org_rocksdb_RemoveEmptyValueCompactionFilter.h"
+#include "utilities/compaction_filters/remove_emptyvalue_compactionfilter.h"
+
+
+/*
+ * Class:     org_rocksdb_RemoveEmptyValueCompactionFilter
+ * Method:    createNewRemoveEmptyValueCompactionFilter0
+ * Signature: ()V
+ */
+void Java_org_rocksdb_RemoveEmptyValueCompactionFilter_createNewRemoveEmptyValueCompactionFilter0(
+    JNIEnv* env, jobject jobj) {
+  const rocksdb::RemoveEmptyValueCompactionFilter* compaction_filter =
+      new rocksdb::RemoveEmptyValueCompactionFilter();
+
+  // set the native handle to our native compaction filter
+  static jclass jclazz =
+      env->FindClass("org/rocksdb/RemoveEmptyValueCompactionFilter");
+  static jfieldID fid = env->GetFieldID(jclazz, "nativeHandle_", "J");
+  env->SetLongField(jobj, fid, reinterpret_cast<jlong>(compaction_filter));
+}

java/src/main/java/org/rocksdb/RemoveEmptyValueCompactionFilter.java

@@ -0,0 +1,18 @@
+// Copyright (c) 2014, Facebook, Inc.  All rights reserved.
+// This source code is licensed under the BSD-style license found in the
+// LICENSE file in the root directory of this source tree. An additional grant
+// of patent rights can be found in the PATENTS file in the same directory.
+
+package org.rocksdb;
+
+/**
+ * Just a Java wrapper around EmptyValueCompactionFilter implemented in C++
+ */
+public class RemoveEmptyValueCompactionFilter extends AbstractCompactionFilter<Slice> {
+  public RemoveEmptyValueCompactionFilter() {
+    super();
+    createNewRemoveEmptyValueCompactionFilter0();
+  }
+
+  private native void createNewRemoveEmptyValueCompactionFilter0();
+}

src.mk

@@ -257,6 +257,7 @@ JNI_NATIVE_SOURCES =                                          \
   java/rocksjni/merge_operator.cc                             \
   java/rocksjni/options.cc                                    \
   java/rocksjni/ratelimiterjni.cc                             \
+  java/rocksjni/remove_emptyvalue_compactionfilterjni.cc      \
   java/rocksjni/restorejni.cc                                 \
   java/rocksjni/rocksjni.cc                                   \
   java/rocksjni/slice.cc                                      \