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This Lutra submodule implements bOTTR (https://spec.ottr.xyz/bOTTR/0.1/). bOTTR is a mapping language for transforming data from relational databases, triplestores, CSV-files and other sources, into instances of templates. Lutra is the reference implementation of the OTTR framework. For more information about OTTR, see http://ottr.xyz.

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package xyz.ottr.lutra.bottr.model;

/*-
 * #%L
 * lutra-bottr
 * %%
 * Copyright (C) 2018 - 2019 University of Oslo
 * %%
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation, either version 2.1 of the
 * License, or (at your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Lesser Public License for more details.
 * 
 * You should have received a copy of the GNU General Lesser Public
 * License along with this program.  If not, see
 * .
 * #L%
 */

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.function.Function;
import java.util.stream.Collectors;
import org.apache.jena.shared.PrefixMapping;
import xyz.ottr.lutra.model.Argument;
import xyz.ottr.lutra.model.terms.Term;
import xyz.ottr.lutra.parser.ArgumentBuilder;
import xyz.ottr.lutra.system.Result;

public class ArgumentMaps implements Function, Result>> {

    private final PrefixMapping prefixMapping;
    private final List> argumentMaps;
    private final Source source;

    public ArgumentMaps(PrefixMapping prefixMapping, Source source, List> argumentMaps) {
        this.prefixMapping = prefixMapping;
        this.argumentMaps = Collections.unmodifiableList(argumentMaps);
        this.source = source;
    }

    public ArgumentMaps(PrefixMapping prefixMapping, Source source) {
        this(prefixMapping, source, Collections.emptyList());
    }

    @Override
    public Result> apply(List inValues) {

        List> outValues;

        if (this.argumentMaps.isEmpty()) {
            outValues = inValues.stream()
                .map(this.source.createArgumentMap(this.prefixMapping))
                .collect(Collectors.toList());
        } else if (inValues.size() != this.argumentMaps.size()) {
            return Result.error("Expected record with " + this.argumentMaps.size() + " elements to match the size of the "
                + this.getClass().getSimpleName() + ", but got a record of size " + inValues.size());
        } else {
            outValues = new ArrayList<>(inValues.size());
            for (int i = 0; i < inValues.size(); i += 1) {
                outValues.add(i, this.argumentMaps.get(i).apply(inValues.get(i)));
            }
        }

        List> arguments = outValues.stream()
            .map(t -> ArgumentBuilder.builder().term(t).build())
            .collect(Collectors.toList());

        return Result.aggregate(arguments);
    }

}