src/java/org/apache/cassandra/db/Row.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
 * limitations under the License.
 */

package org.apache.cassandra.db;

import java.io.*;

import org.apache.cassandra.io.IColumnSerializer;
import org.apache.cassandra.io.IVersionedSerializer;
import org.apache.cassandra.service.StorageService;
import org.apache.cassandra.utils.ByteBufferUtil;

public class Row
{
    private static RowSerializer serializer = new RowSerializer();

    public static RowSerializer serializer()
    {
        return serializer;
    }

    public final DecoratedKey<?> key;
    public final ColumnFamily cf;

    public Row(DecoratedKey<?> key, ColumnFamily cf)
    {
        assert key != null;
        // cf may be null, indicating no data
        this.key = key;
        this.cf = cf;
    }

    public int getLiveColumnCount()
    {
        return cf == null ? 0 : cf.getLiveColumnCount();
    }

    @Override
    public String toString()
    {
        return "Row(" +
               "key=" + key +
               ", cf=" + cf +
               ')';
    }

    public static class RowSerializer implements IVersionedSerializer<Row>
    {
        public void serialize(Row row, DataOutput dos, int version) throws IOException
        {
            ByteBufferUtil.writeWithShortLength(row.key.key, dos);
            ColumnFamily.serializer().serialize(row.cf, dos);
        }

        public Row deserialize(DataInput dis, int version, IColumnSerializer.Flag flag, ISortedColumns.Factory factory) throws IOException
        {
            return new Row(StorageService.getPartitioner().decorateKey(ByteBufferUtil.readWithShortLength(dis)),
                           ColumnFamily.serializer().deserialize(dis, flag, factory));
        }

        public Row deserialize(DataInput dis, int version) throws IOException
        {
            return deserialize(dis, version, IColumnSerializer.Flag.LOCAL, TreeMapBackedSortedColumns.factory());
        }

        public long serializedSize(Row row, int version)
        {
            return DBConstants.shortSize + row.key.key.remaining() + ColumnFamily.serializer().serializedSize(row.cf);
        }
    }
}