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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.serializers;

import java.nio.ByteBuffer;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import org.apache.cassandra.utils.ByteBufferUtil;

public class TupleSerializer extends BytesSerializer
{
    public final List> fields;

    public TupleSerializer(List> fields)
    {
        this.fields = fields;
    }

    @Override
    public void validate(ByteBuffer bytes) throws MarshalException
    {
        ByteBuffer input = bytes.duplicate();
        for (int i = 0; i < fields.size(); i++)
        {
            // we allow the input to have less fields than declared so as to support field addition.
            if (!input.hasRemaining())
                return;

            if (input.remaining() < 4)
                throw new MarshalException(String.format("Not enough bytes to read size of %dth component", i));

            int size = input.getInt();

            // size < 0 means null value
            if (size < 0)
                continue;

            if (input.remaining() < size)
                throw new MarshalException(String.format("Not enough bytes to read %dth component", i));

            ByteBuffer field = ByteBufferUtil.readBytes(input, size);
            fields.get(i).validate(field);
        }

        // We're allowed to get less fields than declared, but not more
        if (input.hasRemaining())
            throw new MarshalException("Invalid remaining data after end of tuple value");
    }
}