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.db.transform;
  
  import org.apache.cassandra.db.partitions.BasePartitionIterator;
  import org.apache.cassandra.db.partitions.PartitionIterator;
  import org.apache.cassandra.db.partitions.UnfilteredPartitionIterator;
  import org.apache.cassandra.db.rows.RowIterator;
  
  public class FilteredPartitions extends BasePartitions<RowIterator, BasePartitionIterator<?>> implements PartitionIterator
  {
      // wrap basic iterator for transformation
      FilteredPartitions(PartitionIterator input)
      {
          super(input);
      }
  
      // wrap basic unfiltered iterator for transformation, applying filter as first transformation
      FilteredPartitions(UnfilteredPartitionIterator input, Filter filter)
      {
          super(input);
          add(filter);
      }
  
      // copy from an UnfilteredPartitions, applying a filter to convert it
      FilteredPartitions(Filter filter, UnfilteredPartitions copyFrom)
      {
          super(copyFrom);
          add(filter);
      }
  
      /**
       * Filter any RangeTombstoneMarker from the iterator's iterators, transforming it into a PartitionIterator.
       */
      public static FilteredPartitions filter(UnfilteredPartitionIterator iterator, long nowInSecs)
      {
          FilteredPartitions filtered = filter(iterator, new Filter(nowInSecs, iterator.metadata().enforceStrictLiveness()));
          return (FilteredPartitions) Transformation.apply(filtered, new EmptyPartitionsDiscarder());
      }
  
      public static FilteredPartitions filter(UnfilteredPartitionIterator iterator, Filter filter)
      {
          return iterator instanceof UnfilteredPartitions
               ? new FilteredPartitions(filter, (UnfilteredPartitions) iterator)
               : new FilteredPartitions(iterator, filter);
      }
  }
  