Function

Value Members

1. final def !=(arg0: Any): Boolean

   

   Definition Classes

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2. final def ##(): Int

   

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3. final def ==(arg0: Any): Boolean

   

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4. final def asInstanceOf[T0]: T0

   

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5. def clone(): AnyRef

   

   Attributes

   protected[java.lang]

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   Annotations

   @throws( ... )

6. def cons[T](f: JavaConsumer[T]): Function[T, Unit]

   

   Creates a Function of T to Unit from a JavaConsumer.

   Creates a Function of T to Unit from a JavaConsumer.

   Allows for better interop with Scala from Java 8 using lambdas.

   For example:

   import com.twitter.util.Future;
   import static com.twitter.util.Function.cons;
   
   Future<String> fs = Future.value("example");
   Future<String> f2 = fs.onSuccess(cons(s -> System.out.println(s)));
   // or using method references:
   fs.onSuccess(cons(System.out::println));

   See also

   func0 if you have a function which takes no input.

   func if you have a function which returns a type, R.

   excons if your function throws checked exceptions.

7. final def eq(arg0: AnyRef): Boolean

   

   Definition Classes

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8. def equals(arg0: Any): Boolean

   

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9. def excons[T](f: ExceptionalJavaConsumer[T]): ExceptionalFunction[T, Unit]

   

   Creates an ExceptionalFunction of T to Unit from an ExceptionalJavaConsumer.

   Creates an ExceptionalFunction of T to Unit from an ExceptionalJavaConsumer.

   Allows for better interop with Scala from Java 8 using lambdas.

   For example:

   import com.twitter.util.Future;
   import static com.twitter.util.Function.excons;
   
   Future<String> fs = Future.value("example");
   Future<String> f2 = fs.onSuccess(excons(s -> { throw new Exception(s); }));

10. def exfunc[T, R](f: ExceptionalJavaFunction[T, R]): ExceptionalFunction[T, R]

    

    Creates an ExceptionalFunction of T to R from an ExceptionalJavaFunction.

    Creates an ExceptionalFunction of T to R from an ExceptionalJavaFunction.

    Allows for better interop with Scala from Java 8 using lambdas.

    For example:

    import com.twitter.util.Future;
    import static com.twitter.util.Function.exfunc;
    
    Future<String> fs = Future.value("example");
    Future<Integer> fi = fs.map(exfunc(s -> { throw new Exception(s); }));

11. def exfunc0[T](f: ExceptionalSupplier[T]): ExceptionalFunction0[T]

    

    Creates an ExceptionalFunction0 to T from an ExceptionalSupplier.

    Creates an ExceptionalFunction0 to T from an ExceptionalSupplier.

    Allows for better interop with Scala from Java 8 using lambdas.

    For example:

    import com.twitter.util.Future;
    import static com.twitter.util.Function.exRunnable;
    
    FuturePool futurePool = FuturePools.immediatePool();
    Future<Unit> fu = futurePool.apply(exfunc0(() -> { throw new Exception("blah"); }));

12. def finalize(): Unit

    

    Attributes

    protected[java.lang]

    Definition Classes

    AnyRef

    Annotations

    @throws( classOf[java.lang.Throwable] )

13. def func[T, R](f: JavaFunction[T, R]): Function[T, R]

    

    Creates a Function of T to R from a JavaFunction.

    Creates a Function of T to R from a JavaFunction.

    Allows for better interop with Scala from Java 8 using lambdas.

    For example:

    import com.twitter.util.Future;
    import static com.twitter.util.Function.func;
    
    Future<String> fs = Future.value("example");
    Future<Integer> fi = fs.map(func(s -> s.length()));
    // or using method references:
    Future<Integer> fi2 = fs.map(func(String::length));

    See also

    cons if you have a side-effecting function (return type is Unit or void)

    exfunc0 if your function throws checked exceptions and takes no input.

    func0 if you have a function which takes no input.

    exfunc if your function throws checked exceptions.

14. def func0[T](f: Supplier[T]): Function0[T]

    

    Creates a Function0 of type-T from a java.util.function.JavaSupplier.

    Creates a Function0 of type-T from a java.util.function.JavaSupplier.

    Allows for better interop with Scala from Java 8 using lambdas.

    For example:

    import com.twitter.util.Future;
    import static com.twitter.util.Function.func0;
    
    Future<String> fs = Future.apply(func0(() -> "example"));

    Note

    as this was introduced after util dropped support for versions of Java below 8, there was no need for a JavaSupplier like class.

    See also

    cons if you have a side-effecting function (return type is Unit or void).

    func if you have a function which returns a type, R.

15. final def getClass(): Class[_]

    

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16. def hashCode(): Int

    

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17. final def isInstanceOf[T0]: Boolean

    

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18. final def ne(arg0: AnyRef): Boolean

    

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19. final def notify(): Unit

    

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20. final def notifyAll(): Unit

    

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21. def ofCallable[A](c: Callable[A]): () ⇒ A

    

    Creates () => A function (scala.Function0) from given Callable.

22. def ofRunnable(r: Runnable): () ⇒ Unit

    

    Creates () => Unit function (scala.Function0) from given Runnable.

23. def synchronizeWith[T, R](m: AnyRef)(f: (T) ⇒ R): (T) ⇒ R

    

    Compose a function with a monitor; all invocations of the returned function are synchronized with the given monitor m.

24. final def synchronized[T0](arg0: ⇒ T0): T0

    

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25. def toString(): String

    

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26. final def wait(): Unit

    

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    Annotations

    @throws( ... )

27. final def wait(arg0: Long, arg1: Int): Unit

    

    Definition Classes

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    @throws( ... )

28. final def wait(arg0: Long): Unit

    

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    @throws( ... )