792f606a64
Contains the cql3 grammer and supporting classes, which will be converted one by one. From commit bf599fb5b062cbcc652da78b7d699e7a01b949ad.
67 lines
2.2 KiB
Java
67 lines
2.2 KiB
Java
/*
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* Licensed to the Apache Software Foundation (ASF) under one
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* or more contributor license agreements. See the NOTICE file
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* distributed with this work for additional information
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* regarding copyright ownership. The ASF licenses this file
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* to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance
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* with the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package org.apache.cassandra.cql3.selection;
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import java.nio.ByteBuffer;
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import java.util.List;
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import org.apache.cassandra.cql3.functions.AggregateFunction;
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import org.apache.cassandra.cql3.functions.Function;
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import org.apache.cassandra.cql3.selection.Selection.ResultSetBuilder;
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import org.apache.cassandra.exceptions.InvalidRequestException;
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final class AggregateFunctionSelector extends AbstractFunctionSelector<AggregateFunction>
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{
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private final AggregateFunction.Aggregate aggregate;
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public boolean isAggregate()
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{
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return true;
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}
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public void addInput(int protocolVersion, ResultSetBuilder rs) throws InvalidRequestException
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{
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// Aggregation of aggregation is not supported
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for (int i = 0, m = argSelectors.size(); i < m; i++)
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{
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Selector s = argSelectors.get(i);
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s.addInput(protocolVersion, rs);
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args.set(i, s.getOutput(protocolVersion));
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s.reset();
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}
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this.aggregate.addInput(protocolVersion, args);
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}
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public ByteBuffer getOutput(int protocolVersion) throws InvalidRequestException
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{
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return aggregate.compute(protocolVersion);
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}
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public void reset()
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{
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aggregate.reset();
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}
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AggregateFunctionSelector(Function fun, List<Selector> argSelectors) throws InvalidRequestException
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{
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super((AggregateFunction) fun, argSelectors);
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this.aggregate = this.fun.newAggregate();
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}
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}
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