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.cassandra.db;
  
  import java.nio.ByteBuffer;
  
  import org.apache.cassandra.dht.IPartitioner;
  import org.apache.cassandra.dht.Token;
  import org.apache.cassandra.utils.bytecomparable.ByteComparable;
  
  public class BufferDecoratedKey extends DecoratedKey
  {
      private final ByteBuffer key;
  
      public BufferDecoratedKey(Token token, ByteBuffer key)
      {
          super(token);
          assert key != null;
          this.key = key;
      }
  
      public ByteBuffer getKey()
      {
          return key;
      }
  
      @Override
      public int getKeyLength()
      {
          return key.remaining();
      }
  
      /**
       * A factory method that translates the given byte-comparable representation to a {@link BufferDecoratedKey}
       * instance. If the given byte comparable doesn't represent the encoding of a buffer decorated key, anything from a
       * wide variety of throwables may be thrown (e.g. {@link AssertionError}, {@link IndexOutOfBoundsException},
       * {@link IllegalStateException}, etc.).
       *
       * @param byteComparable A byte-comparable representation (presumably of a {@link BufferDecoratedKey} instance).
       * @param version The encoding version used for the given byte comparable.
       * @param partitioner The partitioner of the encoded decorated key. Needed in order to correctly decode the token
       *                    bytes of the key.
       * @return A new {@link BufferDecoratedKey} instance, corresponding to the given byte-comparable representation. If
       * we were to call {@link #asComparableBytes(Version)} on the returned object, we should get a {@link ByteSource}
       * equal to the one of the input byte comparable.
       */
      public static BufferDecoratedKey fromByteComparable(ByteComparable byteComparable,
                                                          Version version,
                                                          IPartitioner partitioner)
      {
          return DecoratedKey.fromByteComparable(byteComparable,
                                                 version,
                                                 partitioner,
                                                 (token, keyBytes) -> new BufferDecoratedKey(token, ByteBuffer.wrap(keyBytes)));
      }
  }
  