return true;
    }

    @Override
    public boolean mayExcludeArtifacts() {
        if (mayExcludeArtifacts != null) {
            return mayExcludeArtifacts;
        }
        mayExcludeArtifacts = true;
        for (ExcludeSpec component : getComponents()) {
           if (!component.mayExcludeArtifacts()) {
               mayExcludeArtifacts = false;
               break;
           }
        }

        return false;
    }

    @Override
    public boolean mayExcludeArtifacts() {
        if (mayExcludeArtifacts != null) {
            return mayExcludeArtifacts;
        }
        mayExcludeArtifacts = false;
        for (ExcludeSpec component : getComponents()) {
            if (component.mayExcludeArtifacts()) {
                mayExcludeArtifacts = true;
                break;
            }
        }

    boolean excludesArtifact(ModuleIdentifier module, IvyArtifactName artifactName);

    /**
     * Tells if this rule may exclude some artifacts. This is used to optimize artifact resolution.
     */
    boolean mayExcludeArtifacts();

        // everything excluded **only** applies to modules, not artifacts!
        return false;
    }

    @Override
    public boolean mayExcludeArtifacts() {
        return false; // an exclude all is for modules, not artifacts
    }

    @Override
    public String toString() {
        return "\"excludes everything\"";
    }

    @Override

public interface ArtifactExclude extends ExcludeSpec {
    @Override
    default boolean excludes(ModuleIdentifier module) {
        return false;
    }

    @Override
    default boolean mayExcludeArtifacts() {
        return true;
    }

    IvyArtifactName getArtifact();

    }

    @Override
    public boolean excludesArtifact(ModuleIdentifier module, IvyArtifactName artifactName) {
        return false;
    }

    @Override
    public boolean mayExcludeArtifacts() {
        return false;
    }

    @Override
    public String toString() {
        return "{ \"module names\" : [" + ExcludeJsonHelper.toJson(modules) + "]}";
    }

    }

    @Override
    public boolean excludesArtifact(ModuleIdentifier module, IvyArtifactName artifactName) {
        return false;
    }

    @Override
    public boolean mayExcludeArtifacts() {
        return false;
    }

    @Override
    public boolean equals(Object o) {
        if (this == o) {
            return true;
        }
        if (o == null || getClass() != o.getClass()) {

    }

    @Override
    public boolean excludesArtifact(ModuleIdentifier module, IvyArtifactName artifactName) {
        return false;
    }

    @Override
    public boolean mayExcludeArtifacts() {
        return false;
    }

    @Override
    public boolean equals(Object o) {
        if (this == o) {
            return true;
        }
        if (o == null || getClass() != o.getClass()) {

        return false;
    }

    @Override
    public boolean excludesArtifact(ModuleIdentifier module, IvyArtifactName artifactName) {
        return false;
    }

    @Override
    public boolean mayExcludeArtifacts() {
        return false;
    }

    @Override
    public String toString() {
        return "\"excludes none\"";
    }

    @Override
    public int hashCode() {
        return 0;
    }

    }

    @Override
    public boolean excludesArtifact(ModuleIdentifier module, IvyArtifactName artifactName) {
        return false;
    }

    @Override
    public boolean mayExcludeArtifacts() {
        return false;
    }

    @Override
    public String toString() {
        return "{ \"groups\" : [" + ExcludeJsonHelper.toJson(groups) + "]}";
    }