1	
     2	package descriptor;
     3	
     4	public abstract class AttributeDescriptor {
     5	    protected AttributeDescriptor(String column, Class cls,int type){
     6	        System.out.println("Call " + getClass().getName() + " 01");
     7	    }
     8	    protected AttributeDescriptor(String column, Class cls,Class type){
     9	        System.out.println("Call " + getClass().getName() + " 02");
    10	    }
    11	    protected AttributeDescriptor(String column, Class cls,Class user,Class remoteUser){
    12	        System.out.println("Call " + getClass().getName() + " 03");
    13	    }
    14	    public static AttributeDescriptor forInteger(String column, Class cls){
    15	        return new DefaultDescriptor(column,cls,Integer.TYPE);
    16	    }
    17	    public static AttributeDescriptor forDate(String column, Class cls){
    18	        return new DefaultDescriptor(column,cls,Date.class);
    19	    }
    20	    public static AttributeDescriptor forReference(String column, Class cls){
    21	        return new ReferenceDescriptor(column, cls, User.class, RemoteUser.class);
    22	    }
    23	}
    24	
    25	class Integer {
    26	    public static int TYPE = 0;
    27	}
    28	
    29	class Date {
    30	}
    31	
    32	class User {
    33	}
    34	
    35	class RemoteUser {
    36	}