package genericPro;
import java.lang.reflect.*;
import java.util.*;

public class GenericReflectionTest {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Class<?> cl=Pair.class;
//		printClass(cl);
//		for(Method m:cl.getDeclaredMethods())
//			printMethod(m);
		Type sc=cl.getGenericSuperclass();
		System.out.print(sc);
		
		
	}
	
	public static void printClass(Class<?> cl)
	{
		System.out.print(cl);
		printTypes(cl.getTypeParameters(),"<",",",">",true);
		Type sc=cl.getGenericSuperclass();
		if(sc!=null){
			
			System.out.print(" extends ");
			printType(sc,false);
		}
		printTypes(cl.getGenericInterfaces()," implements ",", ","",false);
		System.out.println();
	}
	
	public static void printMethod(Method m){
		
		String name=m.getName();
		System.out.print(Modifier.toString(m.getModifiers()));
		System.out.print(" ");
		printTypes(m.getTypeParameters(),"<",", ","> ",true);
		
		printType(m.getGenericReturnType(),false);
		System.out.print(" ");
		System.out.print(name);
		System.out.print("(");
		printTypes(m.getGenericParameterTypes(),"",", ","",false);
		System.out.println(")");
		 
	}
	
	public static void printTypes(Type[] types,String pre,String sep,String suf,boolean isDefinition){
		
		if(pre.equals(" extends")&&Arrays.equals(types, new Type[]{Object.class})) return;
		if(types.length>0) System.out.print(pre);
		for(int i=0;i<types.length;i++){
			
			if(i>0) System.out.print(suf);
			printType(types[i],isDefinition);
				
			
		}
		if(types.length>0) System.out.print(suf);
	}
	
	public static void printType(Type type,boolean isDefinition){
		
		if(type instanceof Class){
			
			Class<?> t=(Class<?>) type;
			System.out.print(t.getName());
		}else if(type instanceof TypeVariable){
			
			TypeVariable<?> t=(TypeVariable<?>) type;
			System.out.print(t.getName());
			if(isDefinition)
				printTypes(t.getBounds()," extends","& ","",false);
		}else if(type instanceof WildcardType){
			
			WildcardType t=(WildcardType) type;
			System.out.print("?");
			printTypes(t.getUpperBounds()," extends "," & ","",false);
			printTypes(t.getLowerBounds()," super "," & ","",false);
			
		}else if(type instanceof ParameterizedType){
			
			ParameterizedType t=(ParameterizedType)type;
			Type owner=t.getOwnerType();
			if(owner!=null){
				
				printType(owner,false);
				System.out.print(".");
			}
			printType(t.getRawType(),false);
			printTypes(t.getActualTypeArguments(),"<",", ",">",false);
		}else if(type instanceof GenericArrayType){
			
			GenericArrayType t=(GenericArrayType) type;
			System.out.print(" ");
			printType(t.getGenericComponentType(),isDefinition);
			System.out.print("[]");
			
		}
	}

}