fr.inria.oak.paxquery.pact.operators.binary.DisjLNOEquiJoinOperator.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.binary;

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.datamodel.metadata.NestedMetadata;
import fr.inria.oak.paxquery.common.predicates.DisjunctivePredicate;
import fr.inria.oak.paxquery.pact.configuration.PACTOperatorsConfiguration;
import fr.inria.oak.paxquery.pact.operations.RecordOperations;

/**
 * Disjunctive left nested outer equi-join operator in PACT.
 * 
 */
public class DisjLNOEquiJoinOperator extends BaseCoGroupJoinOperator {

    protected Record nullRecord;

    protected DisjunctivePredicate pred;

    protected int predNumber;

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

        this.nullRecord = RecordOperations.createNullRecord(this.inputRecordsSignature2);

        String predEncoded = parameters.getString(PACTOperatorsConfiguration.PRED_BINARY.toString(), null);
        byte[] predBytes = DatatypeConverter.parseBase64Binary(predEncoded);
        this.pred = (DisjunctivePredicate) SerializationUtils.deserialize(predBytes);

        this.predNumber = parameters.getInteger(PACTOperatorsConfiguration.PRED_INT.toString(), -1);
    }

    @Override
    public void coGroup(Iterator<Record> records1, Iterator<Record> records2, Collector<Record> collector) {
        disjLNOEquiJoin(this.inputRecordsSignature1, records1, this.inputRecordsSignature2, records2, this.pred,
                this.predNumber, this.nullRecord, collector);
    }

    /**
     * 
     * @param inputRecordsSignature1
     * @param records1
     * @param inputRecordsSignature2
     * @param records2
     * @param pred
     * @param from
     * @param outer
     * @param addMark
     * @param aggregationColumn
     * @param aggregationType
     * @param collector
     */
    public static void disjLNOEquiJoin(NestedMetadata inputRecordsSignature1, Iterator<Record> records1,
            NestedMetadata inputRecordsSignature2, Iterator<Record> records2, DisjunctivePredicate pred, int from,
            Record nullRecord, Collector<Record> collector) {
        coGroupNestedJoin(inputRecordsSignature1, records1, inputRecordsSignature2, records2, pred, from, true,
                nullRecord, true, -1, null, false, collector);
    }

}