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    • be.ugent.rml.functions.DynamicMultipleRecordsFunctionExecutor Maven / Gradle / Ivy

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    The RMLMapper executes RML rules to generate high quality Linked Data from multiple originally (semi-)structured data sources.

    There is a newer version: 7.2.0
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    package be.ugent.rml.functions;

import be.ugent.rml.NAMESPACES;
import be.ugent.rml.records.Record;
import be.ugent.rml.term.NamedNode;
import be.ugent.rml.term.Term;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.util.*;

public class DynamicMultipleRecordsFunctionExecutor implements MultipleRecordsFunctionExecutor {

    private static final Logger logger = LoggerFactory.getLogger(DynamicMultipleRecordsFunctionExecutor.class);
    private List parameterValuePairs;
    private FunctionLoader functionLoader;

    public DynamicMultipleRecordsFunctionExecutor(List parameterValuePairs, FunctionLoader functionLoader) {
        this.parameterValuePairs = parameterValuePairs;
        this.functionLoader = functionLoader;
    }

    @Override
    public Object execute(Map records) throws Exception {
        final ArrayList fnTerms = new ArrayList<>();
        final ArrayList args = new ArrayList<>();

        parameterValuePairs.forEach(pv -> {
            ArrayList parameters = new ArrayList<>();
            ArrayList values = new ArrayList<>();

            pv.getParameterGenerators().forEach(parameterGen -> {
                try {
                    parameters.addAll(parameterGen.generate(records.get("child")));
                } catch (Exception e) {
                    //todo be more nice and gentle
                    e.printStackTrace();
                }
            });

            pv.getValueGeneratorPairs().forEach(pair -> {
                try {
                    values.addAll(pair.getTermGenerator().generate(records.get(pair.getOrigin())));
                } catch (Exception e) {
                    //todo be more nice and gentle
                    e.printStackTrace();
                }
            });

            if (parameters.contains(new NamedNode(NAMESPACES.FNO + "executes")) || parameters.contains(new NamedNode(NAMESPACES.FNO_S + "executes"))) {
                if (parameters.contains(new NamedNode(NAMESPACES.FNO + "executes"))) {
                    logger.warn("http is used instead of https for " + NAMESPACES.FNO_S + ". " +
                            "Still works for now, but will be deprecated in the future.");
                }

                fnTerms.add(values.get(0));
            } else {
                parameters.forEach(parameter -> {
                    ArrayList temp = new ArrayList<>();

                    values.forEach(value -> {
                        temp.add(value.getValue());
                    });

                    args.add(new Argument(parameter.getValue(), temp));
                });
            }
        });

        final HashMap mergedArgs = new HashMap<>();
        //TODO check if function is list?
        args.forEach(arg -> {
            if (!mergedArgs.containsKey(arg.getParameter())) {
                mergedArgs.put(arg.getParameter(), arg.getArguments());
            } else {

                mergedArgs.get(arg.getParameter()).addAll(arg.getArguments());
            }
        });
        if (fnTerms.isEmpty()) {
            throw new Exception("No function was defined for parameters: " + mergedArgs.keySet());
        } else {
            return functionLoader.getFunction(fnTerms.get(0)).execute((Map) mergedArgs);
        }
    }
}

/**
 * Helper class to combine a parameter and his arguments in one object
 */
class Argument {
    /**
     * Function Parameter URI
     */
    private String parameter;
    /**
     * All the actual generated values for this parameter
     */
    private List arguments;

    Argument(String parameter, List arguments) {
        this.parameter = parameter;
        this.arguments = arguments;
    }

    public String getParameter() {
        return parameter;
    }

    public List getArguments() {
        return arguments;
    }
}
    
    
    
    

    




    
    
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