fr.inria.oak.paxquery.pact.operators.unary.GroupByWithAggregationOperator.java Source code

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/*******************************************************************************
 * Copyright (C) 2013, 2014, 2015 by Inria and Paris-Sud University
 * 
 * Licensed 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 fr.inria.oak.paxquery.pact.operators.unary;

import java.util.Iterator;

import javax.xml.bind.DatatypeConverter;

import org.apache.commons.lang.SerializationUtils;
import org.apache.flink.configuration.Configuration;
import org.apache.flink.types.Record;
import org.apache.flink.util.Collector;

import fr.inria.oak.paxquery.common.aggregation.AggregationType;
import fr.inria.oak.paxquery.common.datamodel.metadata.NestedMetadata;
import fr.inria.oak.paxquery.pact.configuration.PACTOperatorsConfiguration;

/**
 * GroupBy operator in PACT, plus aggregation on a field of the grouped records. The group field with the nested records
 * may be projected after calculating the aggregation result.
 * 
 */
public class GroupByWithAggregationOperator extends GroupByOperator {

    private int aggregationColumn;

    private AggregationType aggregationType;

    private boolean excludeNestedField;

    private boolean attachDummyColumn;

    @Override
    public void open(Configuration parameters) throws Exception {
        super.open(parameters);

        this.aggregationColumn = parameters.getInteger(PACTOperatorsConfiguration.AGGREGATION_COLUMN_INT.toString(),
                -1);

        String aggregationTypeEncoded = parameters
                .getString(PACTOperatorsConfiguration.AGGREGATION_TYPE_BINARY.toString(), null);
        byte[] aggregationTypeBytes = DatatypeConverter.parseBase64Binary(aggregationTypeEncoded);
        final AggregationType aggregationType = (AggregationType) SerializationUtils
                .deserialize(aggregationTypeBytes);
        this.aggregationType = aggregationType;

        this.excludeNestedField = parameters
                .getBoolean(PACTOperatorsConfiguration.EXCLUDE_NESTED_FIELD_BOOLEAN.toString(), false);

        this.attachDummyColumn = parameters
                .getBoolean(PACTOperatorsConfiguration.ATTACH_DUMMY_COLUMN_BOOLEAN.toString(), false);
    }

    @Override
    public void reduce(Iterator<Record> records, Collector<Record> collector)
            throws InstantiationException, IllegalAccessException {
        groupByWithAggregation(this.inputRecordsSignature, records, this.groupByColumns, this.nestColumns,
                this.aggregationColumn, this.aggregationType, this.excludeNestedField, this.attachDummyColumn,
                collector);
    }

    public static void groupByWithAggregation(NestedMetadata inputRecordsSignature, Iterator<Record> records,
            int[] groupByColumns, int[] nestColumns, int aggregationColumn, AggregationType aggregationType,
            boolean excludeNestedField, boolean attachDummyColumn, Collector<Record> collector)
            throws InstantiationException, IllegalAccessException {
        groupBy(inputRecordsSignature, records, groupByColumns, nestColumns, aggregationColumn, aggregationType,
                excludeNestedField, attachDummyColumn, collector);
    }

}