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.io.util;
  
  import java.nio.ByteBuffer;
  
  import org.apache.cassandra.io.compress.BufferType;
  
  class SimpleChunkReader extends AbstractReaderFileProxy implements ChunkReader
  {
      private final int bufferSize;
      private final BufferType bufferType;
  
      SimpleChunkReader(ChannelProxy channel, long fileLength, BufferType bufferType, int bufferSize)
      {
          super(channel, fileLength);
          this.bufferSize = bufferSize;
          this.bufferType = bufferType;
      }
  
      @Override
      public void readChunk(long position, ByteBuffer buffer)
      {
          buffer.clear();
          channel.read(buffer, position);
          buffer.flip();
      }
  
      @Override
      public int chunkSize()
      {
          return bufferSize;
      }
  
      @Override
      public BufferType preferredBufferType()
      {
          return bufferType;
      }
  
      @Override
      public Rebufferer instantiateRebufferer(boolean forScan)
      {
          if (Integer.bitCount(bufferSize) == 1)
              return new BufferManagingRebufferer.Aligned(this);
          else
              return new BufferManagingRebufferer.Unaligned(this);
      }
  
      @Override
      public String toString()
      {
          return String.format("%s(%s - chunk length %d, data length %d)",
                               getClass().getSimpleName(),
                               channel.filePath(),
                               bufferSize,
                               fileLength());
      }
  }