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.index.sai.disk.v1.postings;
  
  import java.io.IOException;
  
  import org.apache.cassandra.index.sai.postings.PostingList;
  import org.apache.cassandra.index.sai.metrics.QueryEventListener;
  import org.apache.lucene.store.IndexInput;
  
  /**
   * A subclass of the {@link PostingsReader} that does not allow the {@link PostingList} to be
   * advanced and does not support mapping row ids to primary keys.
   *
   * It is used during index merges to sequentially scan the postings in order using {@link #nextPosting}.
   */
  public class ScanningPostingsReader extends PostingsReader
  {
      public ScanningPostingsReader(IndexInput input, BlocksSummary summary) throws IOException
      {
          super(input, summary, QueryEventListener.PostingListEventListener.NO_OP);
      }
  
      @Override
      public long advance(long targetRowId)
      {
          throw new UnsupportedOperationException("Cannot advance a scanning postings reader");
      }
  }
  