/*
* 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.ArrayList;
import java.util.List;
import org.apache.cassandra.config.CFMetaData;
import org.apache.cassandra.config.Schema;
import org.apache.cassandra.cql3.CFDefinition;
import org.apache.cassandra.cql3.ColumnNameBuilder;
import org.apache.cassandra.cql3.ColumnSpecification;
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.instance.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 CFDefinition cfDef;
public TokenFct(CFMetaData cfm)
{
super("token", partitioner.getTokenValidator(), getKeyTypes(cfm));
this.cfDef = cfm.getCfDef();
}
private static AbstractType[] getKeyTypes(CFMetaData cfm)
{
AbstractType[] types = new AbstractType[cfm.getCfDef().keys.size()];
int i = 0;
for (CFDefinition.Name name : cfm.getCfDef().keys.values())
types[i++] = name.type;
return types;
}
public ByteBuffer execute(List<ByteBuffer> parameters) throws InvalidRequestException
{
ColumnNameBuilder builder = cfDef.getKeyNameBuilder();
for (ByteBuffer bb : parameters)
builder.add(bb);
return partitioner.getTokenFactory().toByteArray(partitioner.getToken(builder.build()));
}
}