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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.cql3.functions;
import java.nio.ByteBuffer;
import java.util.Arrays;
import java.util.List;
import org.apache.cassandra.cql3.AssignmentTestable;
import org.apache.cassandra.schema.ColumnMetadata;
import org.apache.cassandra.schema.Schema;
import org.apache.cassandra.schema.TableMetadata;
import org.apache.cassandra.db.CBuilder;
import org.apache.cassandra.db.marshal.AbstractType;
import org.apache.cassandra.exceptions.InvalidRequestException;
import org.apache.cassandra.transport.ProtocolVersion;
public class TokenFct extends NativeScalarFunction
{
private final TableMetadata metadata;
public TokenFct(TableMetadata metadata)
{
super("token", metadata.partitioner.getTokenValidator(), getKeyTypes(metadata));
this.metadata = metadata;
}
@Override
public Arguments newArguments(ProtocolVersion version)
{
ArgumentDeserializer[] deserializers = new ArgumentDeserializer[argTypes.size()];
Arrays.fill(deserializers, ArgumentDeserializer.NOOP_DESERIALIZER);
return new FunctionArguments(version, deserializers);
}
private static AbstractType[] getKeyTypes(TableMetadata metadata)
{
AbstractType[] types = new AbstractType[metadata.partitionKeyColumns().size()];
int i = 0;
for (ColumnMetadata def : metadata.partitionKeyColumns())
types[i++] = def.type;
return types;
}
public ByteBuffer execute(Arguments arguments) throws InvalidRequestException
{
CBuilder builder = CBuilder.create(metadata.partitionKeyAsClusteringComparator());
for (int i = 0; i < arguments.size(); i++)
{
ByteBuffer bb = arguments.get(i);
if (bb == null)
return null;
builder.add(bb);
}
return metadata.partitioner.getTokenFactory().toByteArray(metadata.partitioner.getToken(builder.build().serializeAsPartitionKey()));
}
public static void addFunctionsTo(NativeFunctions functions)
{
functions.add(new FunctionFactory("token")
{
@Override
public NativeFunction getOrCreateFunction(List args,
AbstractType receiverType,
String receiverKeyspace,
String receiverTable)
{
if (receiverKeyspace == null)
throw new InvalidRequestException("No receiver keyspace has been specified for function " + name);
if (receiverTable == null)
throw new InvalidRequestException("No receiver table has been specified for function " + name);
TableMetadata metadata = Schema.instance.getTableMetadata(receiverKeyspace, receiverTable);
if (metadata == null)
throw new InvalidRequestException(String.format("The receiver table %s.%s specified by call to " +
"function %s hasn't been found",
receiverKeyspace, receiverTable, name));
return new TokenFct(metadata);
}
@Override
protected NativeFunction doGetOrCreateFunction(List> argTypes, AbstractType receiverType)
{
throw new AssertionError("Should be unreachable");
}
});
}
}