| /* |
| * 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.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; |
| } |
| |
| 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(ProtocolVersion protocolVersion, List<ByteBuffer> parameters) throws InvalidRequestException |
| { |
| CBuilder builder = CBuilder.create(metadata.partitionKeyAsClusteringComparator()); |
| for (int i = 0; i < parameters.size(); i++) |
| { |
| ByteBuffer bb = parameters.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<? extends AssignmentTestable> 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<AbstractType<?>> argTypes, AbstractType<?> receiverType) |
| { |
| throw new AssertionError("Should be unreachable"); |
| } |
| }); |
| } |
| } |