fr.inria.oak.paxquery.pact.operators.binary.DisjEquiJoinOperator.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 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.ConjunctivePredicate;
import fr.inria.oak.paxquery.common.predicates.DisjunctivePredicate;
import fr.inria.oak.paxquery.pact.configuration.PACTOperatorsConfiguration;
import fr.inria.oak.paxquery.pact.datamodel.type.RecordList;
import fr.inria.oak.paxquery.pact.operations.RecordOperations;
import fr.inria.oak.paxquery.pact.operations.RecordPredicateEvaluation;
import fr.inria.oak.paxquery.pact.operators.BaseMatchOperator;

/**
 * Disjunctive equi-join operator in PACT.
 * 
 */
public class DisjEquiJoinOperator extends BaseMatchOperator {

    private DisjunctivePredicate pred;

    private int predNumber;

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

        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 join(Record record1, Record record2, Collector<Record> collector) {
        disjEquiJoin(this.inputRecordsSignature1, record1, this.inputRecordsSignature2, record2, this.pred,
                this.predNumber, false, collector);
    }

    /**
     * 
     * 
     * @param inputRecordSignature1
     * @param record1
     * @param inputRecordSignature2
     * @param record2
     * @param pred
     * @param collector
     */
    public static void disjEquiJoin(NestedMetadata inputRecordSignature1, Record record1,
            NestedMetadata inputRecordSignature2, Record record2, DisjunctivePredicate pred, int from,
            boolean nested, Collector<Record> collector) {
        //First we extract the predicates that we need to reevaluate
        ConjunctivePredicate[] conjPreds = new ConjunctivePredicate[from];
        for (int i = 0; i < from; i++)
            conjPreds[i] = pred.getConjunctivePreds().get(i);

        //We check if any of the previous predicates evaluate to true
        boolean evaluation = false;
        for (int i = 0; i < from; i++) {
            evaluation = RecordPredicateEvaluation.evaluate(inputRecordSignature1, record1, inputRecordSignature2,
                    record2, conjPreds[i]);
            if (evaluation)
                break;
        }

        //If any of them does, we do not emit the record. Like this we will not generate
        //duplicates for the next operation
        if (!evaluation) {
            if (nested) {
                RecordList listNestedRecord = new RecordList();
                listNestedRecord.add(record2);
                record1.addField(listNestedRecord);
                collector.collect(record1);
            } else {
                RecordOperations.concatenate(record1, record2);
                collector.collect(record1);
            }
        }
    }

}