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   * Licensed to the Apache Software Foundation (ASF) under one
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   * distributed with this work for additional information
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   * 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
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  package org.apache.cassandra.dht;
  
  import java.math.BigInteger;
  
  import accord.api.RoutingKey;
  import accord.primitives.Ranges;
  import accord.utils.Invariants;
  import org.apache.cassandra.service.accord.api.TokenKey;
  
  import static accord.utils.Invariants.requireArgument;
  import static java.math.BigInteger.ONE;
  import static java.math.BigInteger.ZERO;
  
  public class AccordBytesSplitter extends AccordSplitter
  {
      final int byteLength;
  
      protected AccordBytesSplitter(Ranges ranges)
      {
          int bytesLength = 0;
          for (accord.primitives.Range range : ranges)
          {
              bytesLength = Integer.max(bytesLength, byteLength(range.start()));
              bytesLength = Integer.max(bytesLength, byteLength(range.end()));
          }
          // In the single node single token case the ranges in TCM are merged to +/-inf which have no token
          // and no byte length. This isn't really a problem because byte length isn't really that important it just means
          // the shard boundaries will be arbitrary. You won't notice a problem until you go to add nodes and more tokens
          // and suddenly the splitter might use a different length and now your shards are laid out slightly differently at
          // each node which would result in a small amount of metadata moving between command stores.
          // Since BOP is already not working/supported I think it's fine to punt on this.
          if (bytesLength == 0)
          {
              requireArgument(ranges.size() <= 1);
              requireArgument(ranges.isEmpty() || ((TokenKey)ranges.get(0).start()).isMin());
              requireArgument(ranges.isEmpty() || ((TokenKey)ranges.get(0).end()).isMax());
              // Intentionally does not match 16 that is used by ServerTestUtils.getRandomToken to elicit breakage
              bytesLength = 8;
          }
          this.byteLength = bytesLength;
      }
  
      @Override
      BigInteger minimumValue()
      {
          return ZERO;
      }
  
      @Override
      BigInteger maximumValue()
      {
          return ONE.shiftLeft(8 * byteLength).subtract(ONE);
      }
  
      @Override
      BigInteger valueForToken(Token token)
      {
          byte[] bytes = ((ByteOrderedPartitioner.BytesToken) token).token;
          requireArgument(bytes.length <= byteLength);
          BigInteger value = ZERO;
          for (int i = 0 ; i < bytes.length ; ++i)
              value = value.add(BigInteger.valueOf(bytes[i] & 0xffL).shiftLeft((byteLength - 1 - i) * 8));
          return value;
      }
  
      @Override
      Token tokenForValue(BigInteger value)
      {
          Invariants.requireArgument(value.compareTo(ZERO) >= 0);
          byte[] bytes = new byte[byteLength];
          for (int i = 0 ; i < bytes.length ; ++i)
              bytes[i] = value.shiftRight((byteLength - 1 - i) * 8).byteValue();
          return new ByteOrderedPartitioner.BytesToken(bytes);
      }
  
      private static int byteLength(RoutingKey routingKey)
      {
          TokenKey accordKey = (TokenKey) routingKey;
          return byteLength(accordKey.token());
      }
  
      private static int byteLength(Token token)
      {
          return ((ByteOrderedPartitioner.BytesToken) token).token.length;
      }
  }
  