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.rows;
  
  import org.apache.cassandra.db.RegularAndStaticColumns;
  import org.apache.cassandra.db.filter.ColumnFilter;
  import org.apache.cassandra.db.transform.Transformation;
  
  /**
   * Function to skip cells (from an iterator) that are not part of those queried by the user
   * according to the provided {@code ColumnFilter}. See {@link UnfilteredRowIterators#withOnlyQueriedData}
   * for more details.
   */
  public class WithOnlyQueriedData<I extends BaseRowIterator<?>> extends Transformation<I>
  {
      private final ColumnFilter filter;
  
      public WithOnlyQueriedData(ColumnFilter filter)
      {
          this.filter = filter;
      }
  
      @Override
      protected RegularAndStaticColumns applyToPartitionColumns(RegularAndStaticColumns columns)
      {
          return filter.queriedColumns();
      }
  
      @Override
      protected Row applyToStatic(Row row)
      {
          return row.withOnlyQueriedData(filter);
      }
  
      @Override
      protected Row applyToRow(Row row)
      {
          return row.withOnlyQueriedData(filter);
      }
  };
  