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Remove the need for reflection #2

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Remove the need for reflection #2

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33 changes: 12 additions & 21 deletions src/test/java/com/benjiweber/recordmixins/RecordMixinsTest.java
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Original file line number Diff line number Diff line change
Expand Up @@ -69,17 +69,26 @@ public record EnhancedList<T>(List<T> inner) implements
ForwardingList<T>,
Mappable<T>,
Filterable<T, EnhancedList<T>>,
Groupable<T> {}
Groupable<T> {
@Override
public EnhancedList<T> build(List<T> ts) {
return new EnhancedList<>(ts);
}
}

public interface Mappable<T> extends Forwarding<List<T>> {
default <R> List<R> map(Function<T, R> f) {
return inner().stream().map(f).collect(toList());
}
}

public interface Filterable<T, R extends Collection<T>> extends ForwardingAllTheWayDown<List<T>, R> {
public interface Buildable<T, R> {
R build(T t);
}

public interface Filterable<T, R extends Collection<T>> extends Forwarding<List<T>>, Buildable<List<T>, R> {
default R where(Predicate<T> p) {
return forwarding(inner().stream().filter(p).collect(toList()));
return build(inner().stream().filter(p).collect(toList()));
}
}

Expand All @@ -94,24 +103,6 @@ interface Forwarding<T> {
T inner();
}

interface ForwardingAllTheWayDown<T, R> extends Forwarding<T> {
default R forwarding(T t) {
try {
return (R) compatibleConstructor(getClass().getConstructors(), t)
.newInstance(t);
} catch (Exception e) {
throw new IllegalStateException(e);
}
}

default Constructor<?> compatibleConstructor(Constructor<?>[] constructors, T t) {
return Stream.of(constructors)
.filter(ctor -> ctor.getParameterCount() == 1)
.filter(ctor -> ctor.getParameters()[0].getType().isAssignableFrom(t.getClass()))
.findAny().orElseThrow(IllegalStateException::new);
}
}

interface ForwardingList<T> extends List<T>, Forwarding<List<T>> {
List<T> inner();

Expand Down