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The Apache Cassandra Project develops a highly scalable second-generation distributed database, bringing together Dynamo's fully distributed design and Bigtable's ColumnFamily-based data model.

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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
 *
 * 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.security.MessageDigest;

import org.apache.cassandra.config.CFMetaData;
import org.apache.cassandra.serializers.MarshalException;
import org.apache.cassandra.utils.FBUtilities;
import org.apache.cassandra.utils.ObjectSizes;
import org.apache.cassandra.utils.concurrent.OpOrder;
import org.apache.cassandra.utils.memory.AbstractAllocator;
import org.apache.cassandra.utils.memory.MemoryUtil;
import org.apache.cassandra.utils.memory.MemtableAllocator;
import org.apache.cassandra.utils.memory.NativeAllocator;

public class NativeDeletedCell extends NativeCell implements DeletedCell
{
    private static final long SIZE = ObjectSizes.measure(new NativeDeletedCell());

    private NativeDeletedCell()
    {}

    public NativeDeletedCell(NativeAllocator allocator, OpOrder.Group writeOp, DeletedCell copyOf)
    {
        super(allocator, writeOp, copyOf);
    }

    @Override
    public Cell reconcile(Cell cell)
    {
        if (cell instanceof DeletedCell)
            return super.reconcile(cell);
        return cell.reconcile(this);
    }

    @Override
    public boolean isLive()
    {
        return false;
    }

    @Override
    public boolean isLive(long now)
    {
        return false;
    }

    @Override
    public int getLocalDeletionTime()
    {
        int v = getInt(valueStartOffset());
        return MemoryUtil.INVERTED_ORDER ? Integer.reverseBytes(v) : v;
    }

    @Override
    public int serializationFlags()
    {
        return ColumnSerializer.DELETION_MASK;
    }

    @Override
    public void validateFields(CFMetaData metadata) throws MarshalException
    {
        validateName(metadata);

        if ((int) (internalSize() - valueStartOffset()) != 4)
            throw new MarshalException("A tombstone value should be 4 bytes long");
        if (getLocalDeletionTime() < 0)
            throw new MarshalException("The local deletion time should not be negative");
    }

    @Override
    public void updateDigest(MessageDigest digest)
    {
        updateWithName(digest);
        FBUtilities.updateWithLong(digest, timestamp());
        FBUtilities.updateWithByte(digest, serializationFlags());
    }

    @Override
    public DeletedCell localCopy(CFMetaData metadata, AbstractAllocator allocator)
    {
        return new BufferDeletedCell(copy(metadata, allocator), allocator.clone(value()), timestamp());
    }

    @Override
    public DeletedCell localCopy(CFMetaData metadata, MemtableAllocator allocator, OpOrder.Group opGroup)
    {
        return allocator.clone(this, metadata, opGroup);
    }

    @Override
    public long unsharedHeapSizeExcludingData()
    {
        return SIZE;
    }

    @Override
    public long unsharedHeapSize()
    {
        return SIZE;
    }
}