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// VIM_TEST_SETUP let g:java_highlight_functions = 'style'
// VIM_TEST_SETUP let g:java_highlight_signature = 1
// VIM_TEST_SETUP let g:java_highlight_generics = 1
import java.lang.invoke.MethodHandle;
import java.util.function.BiPredicate;
import java.util.function.Consumer;
import java.util.function.Function;
import java.util.function.IntFunction;
import java.util.function.IntSupplier;
import java.util.function.Predicate;
import java.util.function.Supplier;
import java.util.function.ToIntFunction;
import java.util.function.UnaryOperator;
class MethodReferences$Tests
{
static {
// Primary :: [TypeArguments] Identifier
try {
Runnable r1 = ((Runtime) null)::gc;
} catch (NullPointerException expected) {
}
Supplier<Integer> s1 = ((Number) 0)::hashCode;
Supplier<Integer> s2 = ((Comparable<?>) '\0')::hashCode;
Supplier<Integer> s3 = ((Comparable<?>) false)::hashCode;
Supplier<Integer> s4 = "::"::hashCode;
Supplier<Class<?>> s5 = int[].class::arrayType;
Supplier<Integer> s6 = new MethodReferences$Tests() ::
hashCode;
Supplier<Integer> s7 = ((Number)
(new MethodReferences$Tests().xy)[0])::intValue;
Supplier<int[]> s8 = new MethodReferences$Tests().xy::
clone;
Consumer<Object> c1 = System.out :: println;
Supplier<byte[]> s9 = ((Supplier<String>) ()->"()").get()
::getBytes;
Supplier<String> sa = ((Supplier<String>)
((Supplier<String>) ((Supplier<String>)
((Supplier<String>) ((Supplier<String>)
() -> "() -> ()")
::toString)
::toString)
::get)
::toString)
::toString;
// ExpressionName :: [TypeArguments] Identifier
// ReferenceType :: [TypeArguments] Identifier
Function<String, IntSupplier> f1 = s ->
s :: length;
Function<int[][], Supplier<int[]>> f2 = ii ->
((int[]) (ii.length > 0 ? ii[0] : ii))
:: clone;
UnaryOperator<String> uo1 = String::valueOf;
ToIntFunction<String> tif1 = s -> s.transform(
String :: length);
// ClassType :: [TypeArguments] new
// ArrayType :: new
Function<Object, C2> f3 = C2::<Object>new;
Function<C2, C2.C21> f4 = pci -> pci.new
<String>C21(null); // Cf. "d".
Supplier<C1<?>> sb = C1::new;
Function<Byte, C1<?>> f5 = C1<Void> :: <Byte> new;
IntFunction<C1<?>[]> if1 = C1<?>[] :: new;
IntFunction<byte[]> if2 = byte[] :: new;
}
final int[] xy = { 0, 1 };
// super :: [TypeArguments] Identifier
// TypeName . super :: [TypeArguments] Identifier
<T> MethodReferences$Tests()
{
Predicate<T> p1 = MethodReferences$Tests.super::equals;
Predicate<T> p2 = MethodReferences$Tests.this::equals;
}
interface I4<T> extends I3<T>
{
default Predicate<T> superEqualist()
{
return I3
.super::equals; /* "a" */
}
}
interface I3<T> extends I2<T>
{
default Predicate<T> superEqualist()
{
return I2.
super::equals; /* "b" */
}
}
interface I2<T> extends I1<T>
{
default Predicate<T> superEqualist()
{ /* Non-capturing gymnastics for super::equals. */
return Function.<Function<MethodHandle,
Predicate<T>>>
identity()
.apply(mh -> o -> MethodReferences$Tests
.invokePredicate(mh, o))
.apply(EQUALS.bindTo(this));
}
}
interface I1<T>
{
default Predicate<T> equalist()
{ /* Non-capturing gymnastics for this::equals. */
return Function.<Function<I1<T>, Predicate<T>>>
identity()
.apply(that -> o -> Function
.<BiPredicate<I1<T>, T>>
identity()
.apply(I1<T>:: /* "c" */
equals)
.test(that, o))
.apply(I1.this);
}
}
static <T> boolean invokePredicate(MethodHandle mh, T o)
{
try {
return (boolean) mh.invokeExact(o);
} catch (Throwable th) {
throw new RuntimeException(th);
}
}
private static final MethodHandle EQUALS;
static {
try {
EQUALS = java.lang.invoke.MethodHandles.lookup()
.findSpecial(
I1.class,
"equals",
java.lang.invoke.MethodType.methodType(
boolean.class,
Object.class),
I2.class);
} catch (ReflectiveOperationException e) {
throw new Error(e);
}
}
static class C1<T>
{
C1() { }
<A> C1(A dummy) { }
}
static class C2
{
C2() { <String> this(""); }
<A> C2(A dummy)
{
C2.stringer().apply(((Function<C2, C2.C21>)
C2.C21::new) /* "d" */
.apply(C2.this));
}
class C21
{
C21() { <String> this(""); }
<B> C21(B dummy)
{
C2.stringer().apply(C2.this);
}
}
static <T extends Object> Function<T, String> stringer()
{
return T::toString; /* "e" */
}
}
}
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