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.schema.TableMetadata;
  import org.apache.cassandra.db.DecoratedKey;
  import org.apache.cassandra.db.RegularAndStaticColumns;
  import org.apache.cassandra.db.rows.*;
  
  import static org.apache.cassandra.utils.Throwables.merge;
  
  public abstract class BaseRows<R extends Unfiltered, I extends BaseRowIterator<? extends Unfiltered>>
  extends BaseIterator<Unfiltered, I, R>
  implements BaseRowIterator<R>
  {
  
      private Row staticRow;
      private DecoratedKey partitionKey;
  
      public BaseRows(I input)
      {
          super(input);
          staticRow = input.staticRow();
          partitionKey = input.partitionKey();
      }
  
      // swap parameter order to avoid casting errors
      BaseRows(BaseRows<?, ? extends I> copyFrom)
      {
          super(copyFrom);
          staticRow = copyFrom.staticRow;
          partitionKey = copyFrom.partitionKey();
      }
  
      public TableMetadata metadata()
      {
          return input.metadata();
      }
  
      public boolean isReverseOrder()
      {
          return input.isReverseOrder();
      }
  
      public RegularAndStaticColumns columns()
      {
          return input.columns();
      }
  
      public DecoratedKey partitionKey()
      {
          return input.partitionKey();
      }
  
      public Row staticRow()
      {
          return staticRow == null ? Rows.EMPTY_STATIC_ROW : staticRow;
      }
  
  
      // **************************
  
  
      @Override
      protected Throwable runOnClose(int length)
      {
          Throwable fail = null;
          Transformation[] fs = stack;
          for (int i = 0 ; i < length ; i++)
          {
              try
              {
                  fs[i].onPartitionClose();
              }
              catch (Throwable t)
              {
                  fail = merge(fail, t);
              }
          }
          return fail;
      }
  
      @Override
      void add(Transformation transformation)
      {
          transformation.attachTo(this);
          super.add(transformation);
  
          // transform any existing data
          if (staticRow != null)
              staticRow = transformation.applyToStatic(staticRow);
          next = applyOne(next, transformation);
          partitionKey = transformation.applyToPartitionKey(partitionKey);
      }
  
      @Override
      protected Unfiltered applyOne(Unfiltered value, Transformation transformation)
      {
          return value == null
                 ? null
                 : value instanceof Row
                   ? transformation.applyToRow((Row) value)
                   : transformation.applyToMarker((RangeTombstoneMarker) value);
      }
  
      @Override
      public final boolean hasNext()
      {
          Stop stop = this.stop;
          while (this.next == null)
          {
              Transformation[] fs = stack;
              int len = length;
  
              while (!stop.isSignalled && !stopChild.isSignalled && input.hasNext())
              {
                  Unfiltered next = input.next();
  
                  if (next.isRow())
                  {
                      Row row = (Row) next;
                      for (int i = 0 ; row != null && i < len ; i++)
                          row = fs[i].applyToRow(row);
                      next = row;
                  }
                  else
                  {
                      RangeTombstoneMarker rtm = (RangeTombstoneMarker) next;
                      for (int i = 0 ; rtm != null && i < len ; i++)
                          rtm = fs[i].applyToMarker(rtm);
                      next = rtm;
                  }
  
                  if (next != null)
                  {
                      this.next = next;
                      return true;
                  }
              }
  
              if (stop.isSignalled || stopChild.isSignalled || !hasMoreContents())
                  return false;
          }
          return true;
      }
  }
  