fr.inria.oak.paxquery.pact.operators.unary.ProjectionOperator.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 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.pact.configuration.PACTOperatorsConfiguration;
import fr.inria.oak.paxquery.pact.operations.RecordOperations;
import fr.inria.oak.paxquery.pact.operators.BaseMapOperator;

/**
 * Projection operator in PACT.
 * 
 */
public class ProjectionOperator extends BaseMapOperator {

    private int[] keepColumns;

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

        String keepColumnsEncoded = parameters.getString(PACTOperatorsConfiguration.KEEP_COLUMNS_BINARY.toString(),
                null);
        byte[] keepColumnsBytes = DatatypeConverter.parseBase64Binary(keepColumnsEncoded);
        final int[] keepColumns = (int[]) SerializationUtils.deserialize(keepColumnsBytes);
        this.keepColumns = keepColumns;
    }

    @Override
    public void map(Record record, Collector<Record> collector) {
        projection(this.inputRecordsSignature, record, this.keepColumns, collector);
    }

    /**
     * 
     * @param record
     * @param projectedColumns
     * @param collector
     */
    public static void projection(NestedMetadata inputRecordSignature, Record record, int[] keepColumns,
            Collector<Record> collector) {
        RecordOperations.project(record, keepColumns);
        collector.collect(record);
    }

}