22 lines
586 B
Java
22 lines
586 B
Java
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// patterns/TypeMap.java
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// (c)2021 MindView LLC: see Copyright.txt
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// We make no guarantees that this code is fit for any purpose.
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// Visit http://OnJava8.com for more book information.
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// Generic TypeMap works for any types.
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package patterns;
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import java.util.*;
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import java.util.stream.*;
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public class TypeMap<T> {
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public final Map<Class, List<T>> map =
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new HashMap<>();
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public void add(T o) {
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Class type = o.getClass();
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map.computeIfAbsent(type,
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k -> new ArrayList<T>()).add(o);
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}
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public Stream<List<T>> values() {
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return map.values().stream();
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}
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}
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