external/storm-sqe/src/main/java/com/jwplayer/sqe/language/expression/aggregation/Max.java

/**
 * 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 com.jwplayer.sqe.language.expression.aggregation;

import com.jwplayer.sqe.trident.aggregator.GetMaximumAggregator;
import org.apache.storm.trident.fluent.ChainedFullAggregatorDeclarer;
import org.apache.storm.trident.fluent.ChainedPartitionAggregatorDeclarer;
import org.apache.storm.trident.fluent.GroupedStream;
import org.apache.storm.trident.operation.Aggregator;
import org.apache.storm.trident.operation.CombinerAggregator;
import org.apache.storm.trident.state.StateFactory;
import org.apache.storm.tuple.Fields;


public class Max extends AggregationExpression {
    public Max() {
    }

    @Override
    public ChainedFullAggregatorDeclarer aggregate(ChainedFullAggregatorDeclarer stream, Fields inputFields, Fields outputFields) {
        return stream.aggregate(inputFields, (CombinerAggregator) new GetMaximumAggregator(), outputFields);
    }

    @Override
    public ChainedPartitionAggregatorDeclarer partitionAggregate(ChainedPartitionAggregatorDeclarer stream, Fields inputFields, Fields outputFields) {
        return stream.partitionAggregate(inputFields, (Aggregator) new GetMaximumAggregator(), outputFields);
    }

    @Override
    public void persistentAggregate(GroupedStream stream, Fields inputFields, StateFactory factory, Fields functionFields) {
        stream.persistentAggregate(factory, inputFields, new GetMaximumAggregator(), functionFields);
    }

    @Override
    public String getFunctionName() {
        return "max";
    }
}