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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.cql3.functions;
import java.nio.ByteBuffer;
import java.util.List;
import org.apache.cassandra.config.CFMetaData;
import org.apache.cassandra.config.ColumnDefinition;
import org.apache.cassandra.config.Schema;
import org.apache.cassandra.db.composites.CBuilder;
import org.apache.cassandra.db.marshal.AbstractType;
import org.apache.cassandra.dht.IPartitioner;
import org.apache.cassandra.exceptions.InvalidRequestException;
import org.apache.cassandra.service.StorageService;
public class TokenFct extends AbstractFunction
{
// The actual token function depends on the partitioner used
private static final IPartitioner partitioner = StorageService.getPartitioner();
public static final Function.Factory factory = new Function.Factory()
{
public Function create(String ksName, String cfName)
{
return new TokenFct(Schema.instance.getCFMetaData(ksName, cfName));
}
};
private final CFMetaData cfm;
public TokenFct(CFMetaData cfm)
{
super("token", partitioner.getTokenValidator(), getKeyTypes(cfm));
this.cfm = cfm;
}
private static AbstractType[] getKeyTypes(CFMetaData cfm)
{
AbstractType[] types = new AbstractType[cfm.partitionKeyColumns().size()];
int i = 0;
for (ColumnDefinition def : cfm.partitionKeyColumns())
types[i++] = def.type;
return types;
}
public ByteBuffer execute(List<ByteBuffer> parameters) throws InvalidRequestException
{
CBuilder builder = cfm.getKeyValidatorAsCType().builder();
for (int i = 0; i < parameters.size(); i++)
{
ByteBuffer bb = parameters.get(i);
if (bb == null)
return null;
builder.add(bb);
}
return partitioner.getTokenFactory().toByteArray(partitioner.getToken(builder.build().toByteBuffer()));
}
}