src/java/org/apache/cassandra/db/composites/SimpleDenseCellName.java

/*
 * 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
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 */
package org.apache.cassandra.db.composites;

import java.nio.ByteBuffer;

import org.apache.cassandra.config.CFMetaData;
import org.apache.cassandra.cql3.ColumnIdentifier;
import org.apache.cassandra.utils.memory.AbstractAllocator;
import org.apache.cassandra.utils.ObjectSizes;

public class SimpleDenseCellName extends SimpleComposite implements CellName
{
    private static final long EMPTY_SIZE = ObjectSizes.measure(new SimpleDenseCellName(ByteBuffer.allocate(1)));

    // Not meant to be used directly, you should use the CellNameType method instead
    SimpleDenseCellName(ByteBuffer element)
    {
        super(element);
    }

    public int clusteringSize()
    {
        return 1;
    }

    public ColumnIdentifier cql3ColumnName(CFMetaData metadata)
    {
        return null;
    }

    public ByteBuffer collectionElement()
    {
        return null;
    }

    public boolean isCollectionCell()
    {
        return false;
    }

    public boolean isSameCQL3RowAs(CellNameType type, CellName other)
    {
        // Dense cell imply one cell by CQL row so no other cell will be the same row.
        return type.compare(this, other) == 0;
    }

    @Override
    public long unsharedHeapSize()
    {
        return EMPTY_SIZE + ObjectSizes.sizeOnHeapOf(element);
    }

    @Override
    public long unsharedHeapSizeExcludingData()
    {
        return EMPTY_SIZE + ObjectSizes.sizeOnHeapExcludingData(element);
    }

    // If cellnames were sharing some prefix components, this will break it, so
    // we might want to try to do better.
    @Override
    public CellName copy(CFMetaData cfm, AbstractAllocator allocator)
    {
        return new SimpleDenseCellName(allocator.clone(element));
    }

}