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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.cql.jdbc;

import java.nio.ByteBuffer;
import java.util.UUID;

import org.apache.cassandra.utils.UUIDGen;

public class JdbcUUID extends AbstractJdbcUUID
{
    public static final JdbcUUID instance = new JdbcUUID();

    JdbcUUID() {}

    public UUID compose(ByteBuffer bytes)
    {
        bytes = bytes.slice();
        if (bytes.remaining() < 16)
            return new UUID(0, 0);
        return new UUID(bytes.getLong(), bytes.getLong());
    }

    public String getString(ByteBuffer bytes)
    {
        if (bytes.remaining() == 0)
        {
            return "";
        }
        if (bytes.remaining() != 16)
        {
            throw new MarshalException("UUIDs must be exactly 16 bytes");
        }

        return compose(bytes).toString();
    }

    public ByteBuffer decompose(UUID value)
    {
        return ByteBuffer.wrap(UUIDGen.decompose(value));
    }
}