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

/**
 * An operation made up of other operations of type T.
 */
public class CompositeOperation<T extends Operation> extends Operation implements Iterable<T> {
    private final List<T> children;

    public CompositeOperation(Iterable<? extends T> children) {
        this.children = Lists.newArrayList(children);
    }

    public List<T> getOperations() {

        }
        return profile;
    }

    public CompositeOperation<ContinuousOperation> getDependencySets() {
        final List<ContinuousOperation> profiles = CollectionUtils.sort(dependencySets.values(), Operation.slowestFirst());
        return new CompositeOperation<>(profiles);
    }

    public FragmentedOperation getTransformProfile(String transformDescription) {

        }
        return result;
    }

    /**
     * Returns the task executions for this project.
     */
    public CompositeOperation<TaskExecution> getTasks() {
        List<TaskExecution> taskExecutions = CollectionUtils.sort(tasks.values(), slowestFirst());
        return new CompositeOperation<TaskExecution>(taskExecutions);
    }

    /**
     * Get the String project path.
     */
    public String getPath() {

    def "execution time is sum of execution time of child operations"() {
        given:
        Operation child1 = operation(12)
        Operation child2 = operation(10)
        def operation = new CompositeOperation<Operation>([child1, child2])

        expect:
        operation.elapsedTime == 22
    }

    def operation(long elapsedTime) {
        Operation operation = Mock()

            return new ReportRenderer<BuildProfile, SimpleHtmlWriter>() {
                @Override
                public void render(BuildProfile model, SimpleHtmlWriter htmlWriter) throws IOException {
                    CompositeOperation<Operation> profiledProjectConfiguration = model.getProjectConfiguration();

                    htmlWriter.startElement("div").attribute("id", "tabs")
                        .startElement("ul").attribute("class", "tabLinks")