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   * 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.utils.bytecomparable;
  
  import java.nio.ByteBuffer;
  import java.util.Random;
  
  import com.google.common.collect.ImmutableList;
  import org.junit.Assert;
  import org.junit.Test;
  import org.junit.runner.RunWith;
  import org.junit.runners.Parameterized;
  
  import org.apache.cassandra.db.BufferDecoratedKey;
  import org.apache.cassandra.db.DecoratedKey;
  import org.apache.cassandra.dht.ByteOrderedPartitioner;
  
  @RunWith(Parameterized.class)
  public class DecoratedKeyByteSourceTest
  {
      private static final int NUM_ITERATIONS = 100;
      private static final int RANDOM_BYTES_LENGTH = 100;
  
      @Parameterized.Parameters(name = "version={0}")
      public static Iterable<ByteComparable.Version> versions()
      {
          return ImmutableList.of(ByteComparable.Version.OSS50);
      }
  
      private final ByteComparable.Version version;
  
      public DecoratedKeyByteSourceTest(ByteComparable.Version version)
      {
          this.version = version;
      }
  
      @Test
      public void testDecodeBufferDecoratedKey()
      {
          for (int i = 0; i < NUM_ITERATIONS; ++i)
          {
              BufferDecoratedKey initialBuffer =
                      (BufferDecoratedKey) ByteOrderedPartitioner.instance.decorateKey(newRandomBytesBuffer());
              BufferDecoratedKey decodedBuffer = BufferDecoratedKey.fromByteComparable(
                      initialBuffer, version, ByteOrderedPartitioner.instance);
              Assert.assertEquals(initialBuffer, decodedBuffer);
          }
      }
  
      @Test
      public void testDecodeKeyBytes()
      {
          for (int i = 0; i < NUM_ITERATIONS; ++i)
          {
              BufferDecoratedKey initialBuffer =
                      (BufferDecoratedKey) ByteOrderedPartitioner.instance.decorateKey(newRandomBytesBuffer());
              ByteSource.Peekable src = ByteSource.peekable(initialBuffer.asComparableBytes(version));
              byte[] keyBytes = DecoratedKey.keyFromByteSource(src, version, ByteOrderedPartitioner.instance);
              Assert.assertEquals(ByteSource.END_OF_STREAM, src.next());
              Assert.assertArrayEquals(initialBuffer.getKey().array(), keyBytes);
  
              ByteSource.Peekable srcCount = ByteSource.peekable(initialBuffer.asComparableBytes(version));
              int keyBytesCount = DecoratedKey.keySizeFromByteSource(srcCount, version, ByteOrderedPartitioner.instance);
              Assert.assertEquals(ByteSource.END_OF_STREAM, srcCount.next());
              Assert.assertEquals(keyBytes.length, keyBytesCount);
          }
      }
  
      private static ByteBuffer newRandomBytesBuffer()
      {
          byte[] randomBytes = new byte[RANDOM_BYTES_LENGTH];
          new Random().nextBytes(randomBytes);
          return ByteBuffer.wrap(randomBytes);
      }
  }
  