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c

scala.util

Failure

final case class Failure[+T](exception: Throwable) extends Try[T] with Product with Serializable

Source
Try.scala
Linear Supertypes
Try[T], java.io.Serializable, Product, Equals, AnyRef, Any
Type Hierarchy
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Inherited
  1. Failure
  2. Try
  3. Serializable
  4. Product
  5. Equals
  6. AnyRef
  7. Any
Implicitly
  1. by any2stringadd
  2. by StringFormat
  3. by Ensuring
  4. by ArrowAssoc
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Visibility
  1. Public
  2. All

Instance Constructors

  1. new Failure(exception: Throwable)

Type Members

  1. final class WithFilter extends AnyRef

    We need a whole WithFilter class to honor the "doesn't create a new collection" contract even though it seems unlikely to matter much in a collection with max size 1.

    We need a whole WithFilter class to honor the "doesn't create a new collection" contract even though it seems unlikely to matter much in a collection with max size 1.

    Definition Classes
    Try

Value Members

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

    Test two objects for inequality.

    Test two objects for inequality.

    returns

    true if !(this == that), false otherwise.

    Definition Classes
    AnyRef → Any
  2. final def ##(): Int

    Equivalent to x.hashCode except for boxed numeric types and null.

    Equivalent to x.hashCode except for boxed numeric types and null. For numerics, it returns a hash value which is consistent with value equality: if two value type instances compare as true, then ## will produce the same hash value for each of them. For null returns a hashcode where null.hashCode throws a NullPointerException.

    returns

    a hash value consistent with ==

    Definition Classes
    AnyRef → Any
  3. def +(other: String): String
    Implicit
    This member is added by an implicit conversion from Failure[T] toany2stringadd[Failure[T]] performed by method any2stringadd in scala.Predef.
    Definition Classes
    any2stringadd
  4. def ->[B](y: B): (Failure[T], B)
    Implicit
    This member is added by an implicit conversion from Failure[T] toArrowAssoc[Failure[T]] performed by method ArrowAssoc in scala.Predef.
    Definition Classes
    ArrowAssoc
    Annotations
    @inline()
  5. final def ==(arg0: Any): Boolean

    The expression x == that is equivalent to if (x eq null) that eq null else x.equals(that).

    The expression x == that is equivalent to if (x eq null) that eq null else x.equals(that).

    returns

    true if the receiver object is equivalent to the argument; false otherwise.

    Definition Classes
    AnyRef → Any
  6. final def asInstanceOf[T0]: T0

    Cast the receiver object to be of type T0.

    Cast the receiver object to be of type T0.

    Note that the success of a cast at runtime is modulo Scala's erasure semantics. Therefore the expression 1.asInstanceOf[String] will throw a ClassCastException at runtime, while the expression List(1).asInstanceOf[List[String]] will not. In the latter example, because the type argument is erased as part of compilation it is not possible to check whether the contents of the list are of the requested type.

    returns

    the receiver object.

    Definition Classes
    Any
    Exceptions thrown

    ClassCastException if the receiver object is not an instance of the erasure of type T0.

  7. def clone(): AnyRef

    Create a copy of the receiver object.

    Create a copy of the receiver object.

    The default implementation of the clone method is platform dependent.

    returns

    a copy of the receiver object.

    Attributes
    protected[java.lang]
    Definition Classes
    AnyRef
    Annotations
    @throws(classOf[java.lang.CloneNotSupportedException]) @native()
    Note

    not specified by SLS as a member of AnyRef

  8. def collect[U](pf: PartialFunction[T, U]): Try[U]

    Applies the given partial function to the value from this Success or returns this if this is a Failure.

    Applies the given partial function to the value from this Success or returns this if this is a Failure.

    Definition Classes
    Failure → Try
  9. def ensuring(cond: (Failure[T]) => Boolean, msg: => Any): Failure[T]
    Implicit
    This member is added by an implicit conversion from Failure[T] toEnsuring[Failure[T]] performed by method Ensuring in scala.Predef.
    Definition Classes
    Ensuring
  10. def ensuring(cond: (Failure[T]) => Boolean): Failure[T]
    Implicit
    This member is added by an implicit conversion from Failure[T] toEnsuring[Failure[T]] performed by method Ensuring in scala.Predef.
    Definition Classes
    Ensuring
  11. def ensuring(cond: Boolean, msg: => Any): Failure[T]
    Implicit
    This member is added by an implicit conversion from Failure[T] toEnsuring[Failure[T]] performed by method Ensuring in scala.Predef.
    Definition Classes
    Ensuring
  12. def ensuring(cond: Boolean): Failure[T]
    Implicit
    This member is added by an implicit conversion from Failure[T] toEnsuring[Failure[T]] performed by method Ensuring in scala.Predef.
    Definition Classes
    Ensuring
  13. final def eq(arg0: AnyRef): Boolean

    Tests whether the argument (that) is a reference to the receiver object (this).

    Tests whether the argument (that) is a reference to the receiver object (this).

    The eq method implements an equivalence relation on non-null instances of AnyRef, and has three additional properties:

    • It is consistent: for any non-null instances x and y of type AnyRef, multiple invocations of x.eq(y) consistently returns true or consistently returns false.
    • For any non-null instance x of type AnyRef, x.eq(null) and null.eq(x) returns false.
    • null.eq(null) returns true.

    When overriding the equals or hashCode methods, it is important to ensure that their behavior is consistent with reference equality. Therefore, if two objects are references to each other (o1 eq o2), they should be equal to each other (o1 == o2) and they should hash to the same value (o1.hashCode == o2.hashCode).

    returns

    true if the argument is a reference to the receiver object; false otherwise.

    Definition Classes
    AnyRef
  14. val exception: Throwable
  15. def failed: Try[Throwable]

    Inverts this Try.

    Inverts this Try. If this is a Failure, returns its exception wrapped in a Success. If this is a Success, returns a Failure containing an UnsupportedOperationException.

    Definition Classes
    Failure → Try
  16. def filter(p: (T) => Boolean): Try[T]

    Converts this to a Failure if the predicate is not satisfied.

    Converts this to a Failure if the predicate is not satisfied.

    Definition Classes
    Failure → Try
  17. def finalize(): Unit

    Called by the garbage collector on the receiver object when there are no more references to the object.

    Called by the garbage collector on the receiver object when there are no more references to the object.

    The details of when and if the finalize method is invoked, as well as the interaction between finalize and non-local returns and exceptions, are all platform dependent.

    Attributes
    protected[java.lang]
    Definition Classes
    AnyRef
    Annotations
    @throws(classOf[java.lang.Throwable])
    Note

    not specified by SLS as a member of AnyRef

  18. def flatMap[U](f: (T) => Try[U]): Try[U]

    Returns the given function applied to the value from this Success or returns this if this is a Failure.

    Returns the given function applied to the value from this Success or returns this if this is a Failure.

    Definition Classes
    Failure → Try
  19. def flatten[U](implicit ev: <:<[T, Try[U]]): Try[U]

    Transforms a nested Try, ie, a Try of type Try[Try[T]], into an un-nested Try, ie, a Try of type Try[T].

    Transforms a nested Try, ie, a Try of type Try[Try[T]], into an un-nested Try, ie, a Try of type Try[T].

    Definition Classes
    Failure → Try
  20. def fold[U](fa: (Throwable) => U, fb: (T) => U): U

    Applies fa if this is a Failure or fb if this is a Success.

    Applies fa if this is a Failure or fb if this is a Success. If fb is initially applied and throws an exception, then fa is applied with this exception.

    fa

    the function to apply if this is a Failure

    fb

    the function to apply if this is a Success

    returns

    the results of applying the function

    Definition Classes
    Failure → Try
    Example:

    1. val result: Try[Int] = Try { string.toInt }
log(result.fold(
  ex => "Operation failed with " + ex,
  v => "Operation produced value: " + v
))
  21. def foreach[U](f: (T) => U): Unit

    Applies the given function f if this is a Success, otherwise returns Unit if this is a Failure.

    Applies the given function f if this is a Success, otherwise returns Unit if this is a Failure.

    Note: If f throws, then this method may throw an exception.

    Definition Classes
    Failure → Try
  22. def formatted(fmtstr: String): String

    Returns string formatted according to given format string.

    Returns string formatted according to given format string. Format strings are as for String.format (@see java.lang.String.format).

    Implicit
    This member is added by an implicit conversion from Failure[T] toStringFormat[Failure[T]] performed by method StringFormat in scala.Predef.
    Definition Classes
    StringFormat
    Annotations
    @inline()
  23. def get: T

    Returns the value from this Success or throws the exception if this is a Failure.

    Returns the value from this Success or throws the exception if this is a Failure.

    Definition Classes
    Failure → Try
  24. final def getClass(): Class[_ <: AnyRef]

    Returns the runtime class representation of the object.

    Returns the runtime class representation of the object.

    returns

    a class object corresponding to the runtime type of the receiver.

    Definition Classes
    AnyRef → Any
    Annotations
    @native()
  25. def getOrElse[U >: T](default: => U): U

    Returns the value from this Success or the given default argument if this is a Failure.

    Returns the value from this Success or the given default argument if this is a Failure.

    Note:: This will throw an exception if it is not a success and default throws an exception.

    Definition Classes
    Failure → Try
  26. def isFailure: Boolean

    Returns true if the Try is a Failure, false otherwise.

    Returns true if the Try is a Failure, false otherwise.

    Definition Classes
    Failure → Try
  27. final def isInstanceOf[T0]: Boolean

    Test whether the dynamic type of the receiver object is T0.

    Test whether the dynamic type of the receiver object is T0.

    Note that the result of the test is modulo Scala's erasure semantics. Therefore the expression 1.isInstanceOf[String] will return false, while the expression List(1).isInstanceOf[List[String]] will return true. In the latter example, because the type argument is erased as part of compilation it is not possible to check whether the contents of the list are of the specified type.

    returns

    true if the receiver object is an instance of erasure of type T0; false otherwise.

    Definition Classes
    Any
  28. def isSuccess: Boolean

    Returns true if the Try is a Success, false otherwise.

    Returns true if the Try is a Success, false otherwise.

    Definition Classes
    Failure → Try
  29. def map[U](f: (T) => U): Try[U]

    Maps the given function to the value from this Success or returns this if this is a Failure.

    Maps the given function to the value from this Success or returns this if this is a Failure.

    Definition Classes
    Failure → Try
  30. final def ne(arg0: AnyRef): Boolean

    Equivalent to !(this eq that).

    Equivalent to !(this eq that).

    returns

    true if the argument is not a reference to the receiver object; false otherwise.

    Definition Classes
    AnyRef
  31. final def notify(): Unit

    Wakes up a single thread that is waiting on the receiver object's monitor.

    Wakes up a single thread that is waiting on the receiver object's monitor.

    Definition Classes
    AnyRef
    Annotations
    @native()
    Note

    not specified by SLS as a member of AnyRef

  32. final def notifyAll(): Unit

    Wakes up all threads that are waiting on the receiver object's monitor.

    Wakes up all threads that are waiting on the receiver object's monitor.

    Definition Classes
    AnyRef
    Annotations
    @native()
    Note

    not specified by SLS as a member of AnyRef

  33. def orElse[U >: T](default: => Try[U]): Try[U]

    Returns this Try if it's a Success or the given default argument if this is a Failure.

    Returns this Try if it's a Success or the given default argument if this is a Failure.

    Definition Classes
    Failure → Try
  34. def productElementNames: Iterator[String]

    An iterator over the names of all the elements of this product.

    An iterator over the names of all the elements of this product.

    Definition Classes
    Product
  35. def recover[U >: T](pf: PartialFunction[Throwable, U]): Try[U]

    Applies the given function f if this is a Failure, otherwise returns this if this is a Success.

    Applies the given function f if this is a Failure, otherwise returns this if this is a Success. This is like map for the exception.

    Definition Classes
    Failure → Try
  36. def recoverWith[U >: T](pf: PartialFunction[Throwable, Try[U]]): Try[U]

    Applies the given function f if this is a Failure, otherwise returns this if this is a Success.

    Applies the given function f if this is a Failure, otherwise returns this if this is a Success. This is like flatMap for the exception.

    Definition Classes
    Failure → Try
  37. final def synchronized[T0](arg0: => T0): T0
    Definition Classes
    AnyRef
  38. def toEither: Either[Throwable, T]

    Returns Left with Throwable if this is a Failure, otherwise returns Right with Success value.

    Returns Left with Throwable if this is a Failure, otherwise returns Right with Success value.

    Definition Classes
    Failure → Try
  39. def toOption: Option[T]

    Returns None if this is a Failure or a Some containing the value if this is a Success.

    Returns None if this is a Failure or a Some containing the value if this is a Success.

    Definition Classes
    Failure → Try
  40. def transform[U](s: (T) => Try[U], f: (Throwable) => Try[U]): Try[U]

    Completes this Try by applying the function f to this if this is of type Failure, or conversely, by applying s if this is a Success.

    Completes this Try by applying the function f to this if this is of type Failure, or conversely, by applying s if this is a Success.

    Definition Classes
    Failure → Try
  41. final def wait(): Unit
    Definition Classes
    AnyRef
    Annotations
    @throws(classOf[java.lang.InterruptedException])
  42. final def wait(arg0: Long, arg1: Int): Unit
    Definition Classes
    AnyRef
    Annotations
    @throws(classOf[java.lang.InterruptedException])
  43. final def wait(arg0: Long): Unit
    Definition Classes
    AnyRef
    Annotations
    @throws(classOf[java.lang.InterruptedException]) @native()
  44. final def withFilter(p: (T) => Boolean): WithFilter

    Creates a non-strict filter, which eventually converts this to a Failure if the predicate is not satisfied.

    Creates a non-strict filter, which eventually converts this to a Failure if the predicate is not satisfied.

    Note: unlike filter, withFilter does not create a new Try. Instead, it restricts the domain of subsequent map, flatMap, foreach, and withFilter operations.

    As Try is a one-element collection, this may be a bit overkill, but it's consistent with withFilter on Option and the other collections.

    p

    the predicate used to test elements.

    returns

    an object of class WithFilter, which supports map, flatMap, foreach, and withFilter operations. All these operations apply to those elements of this Try which satisfy the predicate p.

    Definition Classes
    Try
    Annotations
    @inline()

Deprecated Value Members

  1. def →[B](y: B): (Failure[T], B)
    Implicit
    This member is added by an implicit conversion from Failure[T] toArrowAssoc[Failure[T]] performed by method ArrowAssoc in scala.Predef.
    Definition Classes
    ArrowAssoc
    Annotations
    @deprecated
    Deprecated

    (Since version 2.13.0) Use -> instead. If you still wish to display it as one character, consider using a font with programming ligatures such as Fira Code.

Inherited from Try[T]

Inherited from java.io.Serializable

Inherited from Product

Inherited from Equals

Inherited from AnyRef

Inherited from Any

Inherited by implicit conversion any2stringadd fromFailure[T] to any2stringadd[Failure[T]]

Inherited by implicit conversion StringFormat fromFailure[T] to StringFormat[Failure[T]]

Inherited by implicit conversion Ensuring fromFailure[T] to Ensuring[Failure[T]]

Inherited by implicit conversion ArrowAssoc fromFailure[T] to ArrowAssoc[Failure[T]]

Ungrouped