// patterns/TypeMap.java

// (c)2021 MindView LLC: see Copyright.txt

// We make no guarantees that this code is fit for any purpose.

// Visit http://OnJava8.com for more book information.

// Generic TypeMap works for any types.

package patterns;

import java.util.*;

import java.util.stream.*;

public class TypeMap<T> {

public final Map<Class, List<T>> map =

new HashMap<>();

public void add(T o) {

Class type = o.getClass();

map.computeIfAbsent(type,

k -> new ArrayList<T>()).add(o);

}

public Stream<List<T>> values() {

return map.values().stream();

}

}