content: /*
   * Licensed to the Apache Software Foundation (ASF) under one
   * or more contributor license agreements.  See the NOTICE file
   * distributed with this work for additional information
   * regarding copyright ownership.  The ASF licenses this file
   * to you under the Apache License, Version 2.0 (the
   * "License"); you may not use this file except in compliance
   * with the License.  You may obtain a copy of the License at
   *
   *     http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  package org.apache.bookkeeper.statelib.impl;
  
  import lombok.AccessLevel;
  import lombok.NoArgsConstructor;
  
  /**
   * Default a few constants used across implementation.
   */
  @NoArgsConstructor(access = AccessLevel.PRIVATE)
  public final class Constants {
  
      public static final String LEDGER_METADATA_APPLICATION_STREAM_STORAGE = "bk-stream-storage-service";
      public static final byte[] EMPTY_BYTE_ARRAY = new byte[0];
      public static final byte[] NULL_START_KEY = EMPTY_BYTE_ARRAY;
      public static final byte[] NULL_END_KEY = new byte[] { 0 };
      public static final long INVALID_REVISION = -1L;
  
      public static boolean isNullStartKey(byte[] key) {
          return null != key && key.length == 0;
      }
  
      public static boolean isNullEndKey(byte[] key) {
          return null != key && key.length == 1 && key[0] == 0;
      }
  
  }
  