Add statistics

java/org/rocksdb/Statistics.java

@@ -0,0 +1,30 @@
+// 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;
+
+/**
+ * Statistics to analyze the performance of a db. Pointer for statistics object
+ * is managed by Options class.
+ */
+public class Statistics {
+  
+  private long statsHandle_;
+  
+  public Statistics(long statsHandle) {
+    statsHandle_ = statsHandle;
+  }
+  
+  public long getTickerCount(StatisticsType statisticsType) {
+    assert(isInitialized());
+    return getTickerCount0(statisticsType.getValue(), statsHandle_);
+  }
+  
+  private boolean isInitialized() {
+    return (statsHandle_ != 0);
+  }
+  
+  private native long getTickerCount0(int ticker, long handle);
+}