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.sstable.format.bti;
  
  import java.io.IOException;
  import java.nio.ByteBuffer;
  
  import org.apache.cassandra.io.sstable.format.Version;
  import org.apache.cassandra.io.util.FileDataInput;
  import org.apache.cassandra.io.util.FileHandle;
  import org.apache.cassandra.utils.ByteBufferUtil;
  
  public class ScrubIterator extends PartitionIndex.IndexPosIterator implements ScrubPartitionIterator
  {
      public static final int EXHAUSTED = -1;
      ByteBuffer key;
      long dataPosition;
      final FileHandle rowIndexFile;
      private final Version version;
  
      ScrubIterator(PartitionIndex partitionIndex, FileHandle rowIndexFile, Version version) throws IOException
      {
          super(partitionIndex);
          this.rowIndexFile = rowIndexFile.sharedCopy();
          this.version = version;
          advance();
      }
  
      @Override
      public void close()
      {
          super.close();
          rowIndexFile.close();
      }
  
      @Override
      public ByteBuffer key()
      {
          return key;
      }
  
      @Override
      public long dataPosition()
      {
          return dataPosition;
      }
  
      @Override
      public void advance() throws IOException
      {
          long pos = nextIndexPos();
          if (pos != PartitionIndex.NOT_FOUND)
          {
              if (pos >= 0) // row index position
              {
                  try (FileDataInput in = rowIndexFile.createReader(pos))
                  {
                      key = ByteBufferUtil.readWithShortLength(in);
                      dataPosition = TrieIndexEntry.deserialize(in, in.getFilePointer(), version).position;
                  }
              }
              else
              {
                  key = null;
                  dataPosition = ~pos;
              }
          }
          else
          {
              key = null;
              dataPosition = EXHAUSTED;
          }
      }
  
      @Override
      public boolean isExhausted()
      {
          return dataPosition == EXHAUSTED;
      }
  }
  