import java.io.File;

public interface CopySpecInternal extends SyncSpec {

    Iterable<CopySpecInternal> getChildren();

    CopySpecInternal addChild();

    CopySpecInternal addChildBeforeSpec(CopySpecInternal childSpec);

    CopySpecInternal addFirst();

    void walk(Action<? super CopySpecResolver> action);

    CopySpecResolver buildRootResolver();

    @Override
    public CopySpecInternal addChild() {
        return getDelegateCopySpec().addChild();
    }

    @Override
    public CopySpecInternal addChildBeforeSpec(CopySpecInternal spec) {
        return getDelegateCopySpec().addChildBeforeSpec(spec);
    }

    @Override
    public CopySpecInternal addFirst() {
        return getDelegateCopySpec().addFirst();
    }

    @Override

        DefaultCopySpec child2 = spec.addChild()

        then:
        child1
        child2
        spec.children == [child1, child2]

        when:
        DefaultCopySpec child3 = spec.addChildBeforeSpec(child2)

        then:
        child3
        spec.children == [child1, child3, child2]
    }

    def 'append Spec after two child Specs if given child does not exist or is null'() {
        when:

        setMetadataCharset("UTF-8");
        // Add these as separate specs, so they are not affected by the changes to the main spec

        webInf = (DefaultCopySpec) getRootSpec().addChildBeforeSpec(getMainSpec()).into("WEB-INF");
        webInf.into("classes", spec -> spec.from((Callable<Iterable<File>>) () -> {
            FileCollection classpath = getClasspath();

        setMetadataCharset("UTF-8");
        generateDeploymentDescriptor = getObjectFactory().property(Boolean.class);
        generateDeploymentDescriptor.convention(true);
        lib = getRootSpec().addChildBeforeSpec(getMainSpec()).into(
            callable(() -> GUtil.elvis(getLibDirName(), DEFAULT_LIB_DIR_NAME))
        );
        getMainSpec().appendCachingSafeCopyAction(action(details -> {

        addChildSpec(child);
        return child;
    }

    @Override
    public CopySpecInternal addChildBeforeSpec(CopySpecInternal childSpec) {
        int position = childSpecs.indexOf(childSpec);
        return position != -1 ? addChildAtPosition(position) : addChild();
    }