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;
  
  import java.util.Iterator;
  
  import org.apache.cassandra.cache.IMeasurableMemory;
  import org.apache.cassandra.db.rows.EncodingStats;
  import org.apache.cassandra.utils.memory.ByteBufferCloner;
  
  /**
   * A combination of a top-level (partition) tombstone and range tombstones describing the deletions
   * within a partition.
   * <p>
   * Note that in practice {@link MutableDeletionInfo} is the only concrete implementation of this, however
   * different parts of the code will return either {@code DeletionInfo} or {@code MutableDeletionInfo} based
   * on whether it can/should be mutated or not.
   * <p>
   * <b>Warning:</b> do not ever cast a {@code DeletionInfo} into a {@code MutableDeletionInfo} to mutate it!!!
   * TODO: it would be safer to have 2 actual implementation of DeletionInfo, one mutable and one that isn't (I'm
   * just lazy right this minute).
   */
  public interface DeletionInfo extends IMeasurableMemory
  {
      // Note that while MutableDeletionInfo.live() is mutable, we expose it here as a non-mutable DeletionInfo so sharing is fine.
      public static final DeletionInfo LIVE = MutableDeletionInfo.live();
  
      /**
       * Returns whether this DeletionInfo is live, that is deletes no columns.
       */
      public boolean isLive();
  
      public DeletionTime getPartitionDeletion();
  
      // Use sparingly, not the most efficient thing
      public Iterator<RangeTombstone> rangeIterator(boolean reversed);
  
      public Iterator<RangeTombstone> rangeIterator(Slice slice, boolean reversed);
  
      public RangeTombstone rangeCovering(Clustering<?> name);
  
      public void collectStats(EncodingStats.Collector collector);
  
      public int dataSize();
  
      public boolean hasRanges();
  
      public int rangeCount();
  
      public long maxTimestamp();
  
      /**
       * Whether this deletion info may modify the provided one if added to it.
       */
      public boolean mayModify(DeletionInfo delInfo);
  
      public MutableDeletionInfo mutableCopy();
  
      public DeletionInfo clone(ByteBufferCloner cloner);
  }
  