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.cql3.selection;
  
  import java.util.List;
  
  import org.apache.cassandra.db.rows.Cell;
  import org.apache.cassandra.schema.ColumnMetadata;
  
  /**
   * The {@link ColumnTimestamps} associated to the given set of columns of a row.
   */
  interface RowTimestamps
  {
      /**
       * Adds an empty timestamp for the specified column.
       *
       * @param index the column index
       */
      void addNoTimestamp(int index);
  
      /**
       * Adds the timestamp of the specified cell.
       *
       * @param index the column index
       * @param cell the cell to get the timestamp from
       * @param nowInSec the query timestamp in second
       */
      void addTimestamp(int index, Cell<?> cell, long nowInSec);
  
      /**
       * Returns the timestamp of the specified column.
       *
       * @param index the column index
       * @return the timestamp of the specified column
       */
      ColumnTimestamps get(int index);
  
      /**
       * A {@code RowTimestamps} that does nothing.
       */
      RowTimestamps NOOP_ROW_TIMESTAMPS = new RowTimestamps()
      {
          @Override
          public void addNoTimestamp(int index)
          {
          }
  
          @Override
          public void addTimestamp(int index, Cell<?> cell, long nowInSec)
          {
          }
  
          @Override
          public ColumnTimestamps get(int index)
          {
              return ColumnTimestamps.NO_TIMESTAMP;
          }
      };
  
      static RowTimestamps newInstance(ColumnTimestamps.TimestampsType type, List<ColumnMetadata> columns)
      {
          final ColumnTimestamps[] array = new ColumnTimestamps[columns.size()];
  
          for (int i = 0, m = columns.size(); i < m; i++)
              array[i] = ColumnTimestamps.newTimestamps(type, columns.get(i).type);
  
          return new RowTimestamps()
          {
              @Override
              public void addNoTimestamp(int index)
              {
                  array[index].addNoTimestamp();
              }
  
              @Override
              public void addTimestamp(int index, Cell<?> cell, long nowInSec)
              {
                  array[index].addTimestampFrom(cell, nowInSec);
              }
  
              @Override
              public ColumnTimestamps get(int index)
              {
                  return array[index];
              }
          };
      }
  }
  