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.bifromq.basekv.store.wal;
  
  import static com.google.protobuf.UnsafeByteOperations.unsafeWrap;
  
  import org.apache.bifromq.basekv.store.util.KVUtil;
  import com.google.protobuf.ByteString;
  
  class KVRangeWALKeys {
      public static final ByteString KEY_CURRENT_VOTING_BYTES = unsafeWrap(new byte[] {(byte) 0});
      public static final ByteString KEY_LATEST_SNAPSHOT_BYTES = unsafeWrap(new byte[] {(byte) 1});
      public static final ByteString KEY_CONFIG_ENTRY_INDEXES_BYTES = unsafeWrap(new byte[] {(byte) 2});
      public static final ByteString KEY_CURRENT_TERM_BYTES = unsafeWrap(new byte[] {(byte) 3});
      public static final ByteString KEY_LOG_ENTRIES_INCAR = unsafeWrap(new byte[] {(byte) 4});
      public static final ByteString KEY_PREFIX_LOG_ENTRIES_BYTES = unsafeWrap(new byte[] {(byte) 5});
  
      public static ByteString configEntriesKeyPrefixInfix(int logEntriesKeyInfix) {
          return KEY_CONFIG_ENTRY_INDEXES_BYTES.concat(KVUtil.toByteString(logEntriesKeyInfix));
      }
  
      public static ByteString configEntriesKey(int logEntriesKeyInfix, long index) {
          return configEntriesKeyPrefixInfix(logEntriesKeyInfix).concat(KVUtil.toByteString(index));
      }
  
      public static ByteString logEntriesKeyPrefixInfix(int logEntriesKeyInfix) {
          return KEY_PREFIX_LOG_ENTRIES_BYTES.concat(KVUtil.toByteString(logEntriesKeyInfix));
      }
  
      public static ByteString logEntryKey(int logEntriesKeyInfix, long logIndex) {
          return logEntriesKeyPrefixInfix(logEntriesKeyInfix).concat(KVUtil.toByteString(logIndex));
      }
  
      public static long parseLogIndex(ByteString logEntryKey) {
          return logEntryKey.asReadOnlyByteBuffer().getLong(2 + Integer.BYTES);
      }
  }
  