Fluent API Enforcement in Java using Interfaces

FluentApiEnforcement.java

import java.util.Date;

public class PermissionManager
{
    public static AssignPermission grantUser(final String user)
    {
        return new Rights(user);
    }

    private static class Rights implements AssignItem, AssignPermission, SetDate
    {
        private String user;
        private String permission;
        private String item;
        private Date date;

        private Rights(final String user) { this.user = user; }

        public SetDate item(final String i) { this.item = i; return this; }

        public AssignItem permissionTo(final String p) { this.permission = p; return this; }

        public void asOf(final Date d) { this.date = d; /* do persistence or other actions here */ }
    }

    public interface AssignPermission { public AssignItem permissionTo( String p ); }
    public interface AssignItem { public SetDate item( String i ); }
    public interface SetDate { public void asOf( Date d ); }

    public static void main(final String[] args)
    {
        PermissionManager.grantUser("me").permissionTo("ALL").item("EVERYTHING").asOf(new Date());
    }
}