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/*
 * 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
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 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
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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.AbstractAllocator;

/**
 * A combination of a top-level (partition) tombstone and range tombstones describing the deletions
 * within a partition.
 * 

* 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. *

* Warning: 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 rangeIterator(boolean reversed); public Iterator 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 copy(AbstractAllocator allocator); }





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