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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.
/*
* 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.UUID;
import org.apache.cassandra.db.marshal.ValueAccessor;
import org.apache.cassandra.utils.ByteBufferUtil;
import org.apache.cassandra.utils.UUIDGen;
public class UUIDSerializer extends TypeSerializer
{
public static final UUIDSerializer instance = new UUIDSerializer();
public UUID deserialize(V value, ValueAccessor accessor)
{
return accessor.isEmpty(value) ? null : accessor.toUUID(value);
}
public ByteBuffer serialize(UUID value)
{
return value == null ? ByteBufferUtil.EMPTY_BYTE_BUFFER : UUIDGen.toByteBuffer(value);
}
public void validate(V value, ValueAccessor accessor) throws MarshalException
{
if (accessor.size(value) != 16 && !accessor.isEmpty(value))
throw new MarshalException(String.format("UUID should be 16 or 0 bytes (%d)", accessor.size(value)));
// not sure what the version should be for this.
}
public String toString(UUID value)
{
return value == null ? "" : value.toString();
}
public Class getType()
{
return UUID.class;
}
}