import org.gradle.internal.component.model.IvyArtifactName;
import org.gradle.internal.resolve.result.ComponentIdResolveResult;

import javax.annotation.Nullable;

public interface ResolvableSelectorState {
    /**
     * The raw component selector being resolved, after any substitution.
     */
    ComponentSelector getSelector();

    /**
     * The version constraint that applies to this selector, if any.

    private class SelectorComparator implements Comparator<ResolvableSelectorState> {
        private final Comparator<Version> versionComparator;

        private SelectorComparator(Comparator<Version> versionComparator) {
            this.versionComparator = versionComparator;
        }

        @Override
        public int compare(ResolvableSelectorState left, ResolvableSelectorState right) {

    }

    private List<ResolvableSelectorState> sort(List<ResolvableSelectorState> list) {
        list.sort(selectors.selectorComparator)
        list
    }

    void verifyEmpty(ModuleSelectors<? extends ResolvableSelectorState> selectors) {
        assert selectors.size() == 0
        assert selectors.first() == null

import org.gradle.internal.resolve.result.ComponentIdResolveResult
import org.gradle.internal.resolve.result.DefaultBuildableComponentIdResolveResult

class TestProjectSelectorState implements ResolvableSelectorState {
    public static final String VERSION = "1"
    private final ProjectComponentIdentifier projectId

    TestProjectSelectorState(ProjectComponentIdentifier projectId) {
        this.projectId = projectId
    }

import org.gradle.internal.resolve.result.ComponentIdResolveResult;
import org.gradle.internal.resolve.result.DefaultBuildableComponentIdResolveResult;

public class TestModuleSelectorState implements ResolvableSelectorState {

    private static final VersionParser VERSION_PARSER = new VersionParser();
    private static final DefaultVersionComparator VERSION_COMPARATOR = new DefaultVersionComparator();