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.celeborn.common.network.buffer;
  
  import java.util.List;
  
  import scala.Tuple2;
  
  import com.google.common.base.Preconditions;
  
  import org.apache.celeborn.common.meta.ReduceFileMeta;
  
  public abstract class ChunkBuffers {
    protected long[] offsets;
    protected int numChunks;
  
    public int numChunks() {
      return numChunks;
    }
  
    public ChunkBuffers(ReduceFileMeta reduceFileMeta) {
      numChunks = reduceFileMeta.getNumChunks();
      if (numChunks > 0) {
        offsets = new long[numChunks + 1];
        List<Long> chunkOffsets = reduceFileMeta.getChunkOffsets();
        for (int i = 0; i <= numChunks; i++) {
          offsets[i] = chunkOffsets.get(i);
        }
      } else {
        offsets = new long[] {0};
      }
    }
  
    public Tuple2<Long, Long> getChunkOffsetLength(int chunkIndex, int offset, int len) {
      final long chunkOffset = offsets[chunkIndex];
      final long chunkLength = offsets[chunkIndex + 1] - chunkOffset;
      Preconditions.checkArgument(offset < chunkLength);
      long length = Math.min(chunkLength - offset, len);
      return new Tuple2<>(chunkOffset + offset, length);
    }
  
    public abstract ManagedBuffer chunk(int chunkIndex, int offset, int len);
  }
  