From 91bf1b80ef7d3a4f719e3f815c2d8c202855ebee Mon Sep 17 00:00:00 2001
From: Adam Retter <adam.retter@googlemail.com>
Date: Tue, 14 Jul 2015 17:48:16 +0100
Subject: [PATCH] Java facility to use the RemoveEmptyValueCompactionFilter

---
 java/Makefile                                 |  1 +
 .../remove_emptyvalue_compactionfilterjni.cc  | 27 +++++++++++++++++++
 .../RemoveEmptyValueCompactionFilter.java     | 18 +++++++++++++
 src.mk                                        |  1 +
 4 files changed, 47 insertions(+)
 create mode 100644 java/rocksjni/remove_emptyvalue_compactionfilterjni.cc
 create mode 100644 java/src/main/java/org/rocksdb/RemoveEmptyValueCompactionFilter.java

diff --git a/java/Makefile b/java/Makefile
index fcd441ca4..dd678f5c3 100644
--- a/java/Makefile
+++ b/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\
diff --git a/java/rocksjni/remove_emptyvalue_compactionfilterjni.cc b/java/rocksjni/remove_emptyvalue_compactionfilterjni.cc
new file mode 100644
index 000000000..e442d8daf
--- /dev/null
+++ b/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));
+}
diff --git a/java/src/main/java/org/rocksdb/RemoveEmptyValueCompactionFilter.java b/java/src/main/java/org/rocksdb/RemoveEmptyValueCompactionFilter.java
new file mode 100644
index 000000000..61c46131b
--- /dev/null
+++ b/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();
+}
diff --git a/src.mk b/src.mk
index 6fc690f32..6d60743b6 100644
--- a/src.mk
+++ b/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                                      \