[Java] Add compaction style to options

Summary:
Add compression type to options

make rocksdbjava
make sample

Reviewers: haobo, yhchiang, sdong, dhruba, rsumbaly, zzbennett, swapnilghike
Reviewed By: yhchiang, sdong
CC: leveldb

Differential Revision: https://reviews.facebook.net/D20463

java/org/rocksdb/CompactionStyle.java

@@ -0,0 +1,22 @@
+// 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;
+
+public enum CompactionStyle {
+  LEVEL((byte) 0),
+  UNIVERSAL((byte) 1),
+  FIFO((byte) 2);
+  
+  private final byte value_;
+
+  private CompactionStyle(byte value) {
+    value_ = value;
+  }
+
+  public byte getValue() {
+    return value_;
+  }
+}