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/*
 * Copyright 2017-2020 Crown Copyright
 *
 * 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 uk.gov.gchq.gaffer.sparkaccumulo.operation.utils.java;

import org.apache.accumulo.core.data.Key;
import org.apache.accumulo.core.data.Value;
import org.apache.spark.api.java.function.PairFlatMapFunction;
import org.apache.spark.broadcast.Broadcast;
import scala.Tuple2;

import uk.gov.gchq.gaffer.accumulostore.key.AccumuloElementConverter;
import uk.gov.gchq.gaffer.commonutil.pair.Pair;
import uk.gov.gchq.gaffer.data.element.Element;

import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;

public class ElementConverterFunction implements PairFlatMapFunction {
    private static final long serialVersionUID = -3259752069724639102L;

    private final Broadcast converterBroadcast;

    public ElementConverterFunction(final Broadcast converterBroadcast) {
        this.converterBroadcast = converterBroadcast;
    }

    @Override
    public Iterator> call(final Element e) throws Exception {
        final List> tuples = new ArrayList<>(2);
        final Pair keys = converterBroadcast.value().getKeysFromElement(e);
        final Value value = converterBroadcast.value().getValueFromElement(e);
        tuples.add(new Tuple2<>(keys.getFirst(), value));
        final Key second = keys.getSecond();
        if (null != second) {
            tuples.add(new Tuple2<>(second, value));
        }
        return tuples.listIterator();
    }
}