import java.io.IOException;

public class CompositeDataReporter<T extends PerformanceTestResult> implements DataReporter<T> {
    private final ImmutableList<DataReporter<? super T>> reporters;

    @SafeVarargs
    public static <S extends PerformanceTestResult> CompositeDataReporter<S> of(DataReporter<? super S>... reporters) {
        return new CompositeDataReporter<S>(ImmutableList.copyOf(reporters));
    }

import java.util.List;
import java.util.Set;

@CompileStatic
public class CompositeDataReporter implements DataReporter<CrossVersionPerformanceResults>, Closeable {
    private final List<DataReporter<CrossVersionPerformanceResults>> reporters;
    private final Set<String> testIds = new HashSet<>();

    public CompositeDataReporter(List<DataReporter<CrossVersionPerformanceResults>> reporters) {
        this.reporters = reporters;

            Arrays.stream(columns).map(s -> "?").collect(Collectors.joining(", ")) +
            ")";
    }

    default DataReporter<T> reportAlso(DataReporter<PerformanceTestResult> otherReporter) {
        return CompositeDataReporter.of(this, otherReporter);
    }