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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.db.marshal;
import java.nio.ByteBuffer;
import java.util.Iterator;
import org.apache.cassandra.config.DatabaseDescriptor;
import org.apache.cassandra.cql3.Term;
import org.apache.cassandra.db.PartitionPosition;
import org.apache.cassandra.serializers.TypeSerializer;
import org.apache.cassandra.serializers.MarshalException;
import org.apache.cassandra.dht.IPartitioner;
import org.apache.cassandra.transport.ProtocolVersion;
import org.apache.cassandra.utils.ByteBufferUtil;
import org.apache.cassandra.utils.FBUtilities;
/** for sorting columns representing row keys in the row ordering as determined by a partitioner.
* Not intended for user-defined CFs, and will in fact error out if used with such. */
public class PartitionerDefinedOrder extends AbstractType
{
private final IPartitioner partitioner;
public PartitionerDefinedOrder(IPartitioner partitioner)
{
super(ComparisonType.CUSTOM);
this.partitioner = partitioner;
}
public static AbstractType getInstance(TypeParser parser)
{
IPartitioner partitioner = DatabaseDescriptor.getPartitioner();
Iterator argIterator = parser.getKeyValueParameters().keySet().iterator();
if (argIterator.hasNext())
{
partitioner = FBUtilities.newPartitioner(argIterator.next());
assert !argIterator.hasNext();
}
return partitioner.partitionOrdering();
}
@Override
public ByteBuffer compose(ByteBuffer bytes)
{
throw new UnsupportedOperationException("You can't do this with a local partitioner.");
}
@Override
public ByteBuffer decompose(ByteBuffer bytes)
{
throw new UnsupportedOperationException("You can't do this with a local partitioner.");
}
public String getString(ByteBuffer bytes)
{
return ByteBufferUtil.bytesToHex(bytes);
}
public ByteBuffer fromString(String source)
{
throw new UnsupportedOperationException();
}
@Override
public Term fromJSONObject(Object parsed)
{
throw new UnsupportedOperationException();
}
@Override
public String toJSONString(ByteBuffer buffer, ProtocolVersion protocolVersion)
{
throw new UnsupportedOperationException();
}
public int compareCustom(ByteBuffer o1, ByteBuffer o2)
{
// o1 and o2 can be empty so we need to use PartitionPosition, not DecoratedKey
return PartitionPosition.ForKey.get(o1, partitioner).compareTo(PartitionPosition.ForKey.get(o2, partitioner));
}
@Override
public void validate(ByteBuffer bytes) throws MarshalException
{
throw new IllegalStateException("You shouldn't be validating this.");
}
public TypeSerializer getSerializer()
{
throw new UnsupportedOperationException("You can't do this with a local partitioner.");
}
@Override
public String toString()
{
return String.format("%s(%s)", getClass().getName(), partitioner.getClass().getName());
}
}