framework/tests/all-systems/java8/memberref/MemberReferences.java

// If conservativeUninferredTypeArguments option is used, then the lines marked
// "TODO: Issue 802", will issue a methodref.inference.unimplemented warning.

interface Supplier<R> {
  R supply();
}

interface FunctionMR<T, R> {
  R apply(T t);
}

interface Consumer<T> {
  void consume(T t);
}

interface BiFunctionMR<T, U, R> {
  R apply(T t, U u);
}

/** super # instMethod */
// SUPER(ReferenceMode.INVOKE, false),
class Super {

  Object func1(Object o) {
    return o;
  }

  <T> T func2(T o) {
    return o;
  }

  class Sub extends Super {
    void context() {
      FunctionMR<Object, Object> f1 = super::func1;
      // TODO: Issue 802: type argument inference
      FunctionMR f2 = super::func2;
      // Top level wildcards are ignored when type checking
      FunctionMR<? extends String, ? extends String> f3 = super::<String>func2;
    }
  }
}

class SuperWithArg<U> {

  void func1(U o) {}

  class Sub extends SuperWithArg<Number> {
    void context() {
      Consumer<Integer> f1 = super::func1;
    }
  }
}

/** Type # instMethod. */
// UNBOUNDED(ReferenceMode.INVOKE, true),
class Unbound {
  <T> T func1(T o) {
    return o;
  }

  void context() {
    FunctionMR<String, String> f1 = String::toString;
    // TODO: Issue 802: type argument inference
    BiFunctionMR<Unbound, String, String> f2 = Unbound::func1;
    @SuppressWarnings("nullness:type.argument")
    BiFunctionMR<? extends Unbound, ? super Integer, ? extends Integer> f3 =
        Unbound::<Integer>func1;
  }
}

abstract class UnboundWithArg<U> {
  abstract U func1();

  void context() {
    // TODO: Issue 802: type argument inference
    FunctionMR<UnboundWithArg<String>, String> f1 = UnboundWithArg::func1;
    FunctionMR<UnboundWithArg<String>, String> f2 = UnboundWithArg<String>::func1;
    // TODO: Issue 802: type argument inference
    FunctionMR<? extends UnboundWithArg<String>, String> f3 = UnboundWithArg::func1;
    FunctionMR<? extends UnboundWithArg<String>, String> f4 = UnboundWithArg<String>::func1;
  }
}

/** Type # staticMethod. */
// STATIC(ReferenceMode.INVOKE, false),
class Static {
  static <T> T func1(T o) {
    return o;
  }

  void context() {
    // TODO: Issue 802: type argument inference
    FunctionMR<String, String> f1 = Static::func1;
    FunctionMR<String, String> f2 = Static::<String>func1;
  }
}

/** Expr # instMethod. */
// BOUND(ReferenceMode.INVOKE, false),
class Bound {
  <T> T func1(T o) {
    return o;
  }

  void context(Bound bound) {
    // TODO: Issue 802: type argument inference
    FunctionMR<String, String> f1 = bound::func1;
    // TODO: Issue 802: type argument inference
    FunctionMR<String, String> f2 = this::func1;
    FunctionMR<String, String> f3 = this::<String>func1;
    FunctionMR<? extends String, ? extends String> f4 = this::<String>func1;
  }
}

class BoundWithArg<U> {
  void func1(U param) {}

  void context(BoundWithArg<Number> bound) {
    Consumer<Number> f1 = bound::func1;
    Consumer<Integer> f2 = bound::func1;
  }
}

/** Inner # new. */
// IMPLICIT_INNER(ReferenceMode.NEW, false),
class Outer {
  void context(Outer other) {
    Supplier<Inner> f1 = Inner::new;
  }

  class Inner extends Outer {}
}

class OuterWithArg {
  void context() {
    // TODO: Issue 802: type argument inference
    Supplier<Inner<String>> f1 = Inner::new;
    Supplier<? extends Inner<Number>> f2 = Inner<Number>::new;
    Supplier<? extends Inner<? extends Number>> f3 = Inner<Integer>::new;
  }

  class Inner<T> extends OuterWithArg {}
}

/** Toplevel # new. */
// TOPLEVEL(ReferenceMode.NEW, false),
class TopLevel {
  TopLevel() {}

  <T> TopLevel(T s) {}

  void context() {
    Supplier<TopLevel> f1 = TopLevel::new;
    // TODO: Issue 802: type argument inference
    FunctionMR<String, TopLevel> f2 = TopLevel::new;
    FunctionMR<String, TopLevel> f3 = TopLevel::<String>new;
  }
}

class TopLevelWithArg<T> {
  TopLevelWithArg() {}

  <U> TopLevelWithArg(U s) {}

  void context() {
    // TODO: Issue 802: type argument inference
    Supplier<TopLevelWithArg<String>> f1 = TopLevelWithArg::new;
    Supplier<TopLevelWithArg<String>> f2 = TopLevelWithArg<String>::new;
    FunctionMR<String, TopLevelWithArg<String>> f3 = TopLevelWithArg<String>::<String>new;
  }
}

/** ArrayType # new. */
// ARRAY_CTOR(ReferenceMode.NEW, false);

class ArrayType {
  void context() {
    // TODO: Signedness Checker does not default boxed primitives correctly.
    // See Issue #797: https://github.com/typetools/checker-framework/issues/797
    @SuppressWarnings({"signedness"})
    FunctionMR<Integer, String[]> string = String[]::new;
    FunctionMR<String[], String[]> clone = String[]::clone;
    FunctionMR<String[], String> toString = String[]::toString;
  }
}