| /* |
| * 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.selection; |
| |
| import java.nio.ByteBuffer; |
| import java.util.List; |
| |
| import org.apache.cassandra.cql3.functions.AggregateFunction; |
| import org.apache.cassandra.cql3.functions.Function; |
| import org.apache.cassandra.exceptions.InvalidRequestException; |
| import org.apache.cassandra.transport.ProtocolVersion; |
| |
| final class AggregateFunctionSelector extends AbstractFunctionSelector<AggregateFunction> |
| { |
| private final AggregateFunction.Aggregate aggregate; |
| |
| public boolean isAggregate() |
| { |
| return true; |
| } |
| |
| public void addInput(ProtocolVersion protocolVersion, ResultSetBuilder rs) throws InvalidRequestException |
| { |
| // Aggregation of aggregation is not supported |
| for (int i = 0, m = argSelectors.size(); i < m; i++) |
| { |
| Selector s = argSelectors.get(i); |
| s.addInput(protocolVersion, rs); |
| setArg(i, s.getOutput(protocolVersion)); |
| s.reset(); |
| } |
| this.aggregate.addInput(protocolVersion, args()); |
| } |
| |
| public ByteBuffer getOutput(ProtocolVersion protocolVersion) throws InvalidRequestException |
| { |
| return aggregate.compute(protocolVersion); |
| } |
| |
| public void reset() |
| { |
| aggregate.reset(); |
| } |
| |
| AggregateFunctionSelector(Function fun, List<Selector> argSelectors) throws InvalidRequestException |
| { |
| super((AggregateFunction) fun, argSelectors); |
| |
| this.aggregate = this.fun.newAggregate(); |
| } |
| } |