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.kafka.common.record;
  
  import org.apache.kafka.common.network.TransferableChannel;
  
  import java.io.IOException;
  import java.nio.channels.FileChannel;
  
  /**
   * Represents a file record set which is not necessarily offset-aligned
   */
  public class UnalignedFileRecords implements UnalignedRecords {
  
      private final FileChannel channel;
      private final long position;
      private final int size;
  
      public UnalignedFileRecords(FileChannel channel, long position, int size) {
          this.channel = channel;
          this.position = position;
          this.size = size;
      }
  
      @Override
      public int sizeInBytes() {
          return size;
      }
  
      @Override
      public int writeTo(TransferableChannel destChannel, int previouslyWritten, int remaining) throws IOException {
          long position = this.position + previouslyWritten;
          int count = Math.min(remaining, sizeInBytes() - previouslyWritten);
          // safe to cast to int since `count` is an int
          return (int) destChannel.transferFrom(channel, position, count);
      }
  }
  