ceph/src/rocksdb/java/src/main/java/org/rocksdb/DirectComparator.java

   1 // Copyright (c) 2011-present, Facebook, Inc.  All rights reserved.
   2 //  This source code is licensed under both the GPLv2 (found in the
   3 //  COPYING file in the root directory) and Apache 2.0 License
   4 //  (found in the LICENSE.Apache file in the root directory).
   5
   6 package org.rocksdb;
   7
   8 /**
   9  * Base class for comparators which will receive
  10  * ByteBuffer based access via org.rocksdb.DirectSlice
  11  * in their compare method implementation.
  12  *
  13  * ByteBuffer based slices perform better when large keys
  14  * are involved. When using smaller keys consider
  15  * using @see org.rocksdb.Comparator
  16  */
  17 public abstract class DirectComparator extends AbstractComparator<DirectSlice> {
  18
  19   public DirectComparator(final ComparatorOptions copt) {
  20     super(copt);
  21   }
  22
  23   @Override
  24   protected long initializeNative(final long... nativeParameterHandles) {
  25     return createNewDirectComparator0(nativeParameterHandles[0]);
  26   }
  27
  28   @Override
  29   final ComparatorType getComparatorType() {
  30     return ComparatorType.JAVA_DIRECT_COMPARATOR;
  31   }
  32
  33   private native long createNewDirectComparator0(
  34       final long comparatorOptionsHandle);
  35 }