Packages

object BasicIO

This object contains factories for scala.sys.process.ProcessIO, which can be used to control the I/O of a scala.sys.process.Process when a scala.sys.process.ProcessBuilder is started with the run command.

It also contains some helper methods that can be used to in the creation of ProcessIO.

It is used by other classes in the package in the implementation of various features, but can also be used by client code.

Source
BasicIO.scala
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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. 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
  4. final val BufferSize: Int(8192)

    Size of the buffer used in all the functions that copy data

  5. final val Newline: String

    Used to separate lines in the processFully function that takes Appendable.

  6. def apply(withIn: Boolean, log: ProcessLogger): ProcessIO

    Creates a ProcessIO from a ProcessLogger .

    Creates a ProcessIO from a ProcessLogger . It can attach the process input to stdin.

    withIn

    True if the process input should be attached to stdin.

    log

    A ProcessLogger to receive all output, normal and error.

    returns

    A ProcessIO with the characteristics above.

  7. def apply(withIn: Boolean, buffer: Appendable, log: Option[ProcessLogger]): ProcessIO

    Creates a ProcessIO that appends its output to an Appendable.

    Creates a ProcessIO that appends its output to an Appendable. It can attach the process input to stdin, and it will either send the error stream to stderr, or to a ProcessLogger.

    For example, the ProcessIO created by the function below will store the normal output on the buffer provided, and print all error on stderr. The input will be read from stdin.

    import scala.sys.process.{BasicIO, ProcessLogger}
    val printer = ProcessLogger(println(_))
    def appendToBuffer(b: StringBuffer) = BasicIO(true, b, Some(printer))
    withIn

    True if the process input should be attached to stdin.

    buffer

    An Appendable which will receive the process normal output.

    log

    An optional ProcessLogger to which the output should be sent. If None, output will be sent to stderr.

    returns

    A ProcessIO with the characteristics above.

  8. def apply(withIn: Boolean, output: (String) => Unit, log: Option[ProcessLogger]): ProcessIO

    Creates a ProcessIO from a function String => Unit.

    Creates a ProcessIO from a function String => Unit. It can attach the process input to stdin, and it will either send the error stream to stderr, or to a ProcessLogger.

    For example, the ProcessIO created below will print all normal output while ignoring all error output. No input will be provided.

    import scala.sys.process.BasicIO
    val errToDevNull = BasicIO(false, println(_), None)
    withIn

    True if the process input should be attached to stdin.

    output

    A function that will be called with the process output.

    log

    An optional ProcessLogger to which the output should be sent. If None, output will be sent to stderr.

    returns

    A ProcessIO with the characteristics above.

  9. final def asInstanceOf[T0]: T0

    Forces the compiler to treat the receiver object as having type T0, even though doing so may violate type safety.

    Forces the compiler to treat the receiver object as having type T0, even though doing so may violate type safety.

    This method is useful when you believe you have type information the compiler doesn't, and it also isn't possible to check the type at runtime. In such situations, skipping type safety is the only option.

    It is platform dependent whether asInstanceOf has any effect at runtime. It might do a runtime type test on the erasure of T0, insert a conversion (such as boxing/unboxing), fill in a default value, or do nothing at all.

    In particular, asInstanceOf is not a type test. It does **not** mean:

    this match {
     case x: T0 => x
     case _     => throw ClassCastException("...")

    Use pattern matching or isInstanceOf for type testing instead.

    Situations where asInstanceOf is useful:

    • when flow analysis fails to deduce T0 automatically
    • when down-casting a type parameter or an abstract type member (which cannot be checked at runtime due to type erasure) If there is any doubt and you are able to type test instead, you should do so.

    Be careful of using asInstanceOf when T0 is a primitive type. When T0 is primitive, asInstanceOf may insert a conversion instead of a type test. If your intent is to convert, use a toT method (x.toChar, x.toByte, etc.).

    returns

    the receiver object.

    Definition Classes
    Any
    Exceptions thrown

    ClassCastException if the receiver is not an instance of the erasure of T0, if that can be checked on this platform

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

    not specified by SLS as a member of AnyRef

  11. def close(c: Closeable): Unit

    Closes a Closeable without throwing an exception

  12. def connectToIn(o: OutputStream): Unit

    Copy contents of stdin to the OutputStream.

  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. def equals(arg0: AnyRef): Boolean

    The equality method for reference types.

    The equality method for reference types. Default implementation delegates to eq.

    See also equals in scala.Any.

    returns

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

    Definition Classes
    AnyRef → Any
  15. 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[lang]
    Definition Classes
    AnyRef
    Annotations
    @throws(classOf[java.lang.Throwable])
    Note

    not specified by SLS as a member of AnyRef

  16. 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()
  17. def getErr(log: Option[ProcessLogger]): (InputStream) => Unit

    Returns a function InputStream => Unit given an optional ProcessLogger.

    Returns a function InputStream => Unit given an optional ProcessLogger. If no logger is passed, the function will send the output to stderr. This function can be used to create a scala.sys.process.ProcessIO.

    log

    An optional ProcessLogger to which the contents of the InputStream will be sent.

    returns

    A function InputStream => Unit (used by scala.sys.process.ProcessIO) which will send the data to either the provided ProcessLogger or, if None, to stderr.

  18. def hashCode(): Int

    The hashCode method for reference types.

    The hashCode method for reference types. See hashCode in scala.Any.

    returns

    the hash code value for this object.

    Definition Classes
    AnyRef → Any
    Annotations
    @native()
  19. def input(connect: Boolean): (OutputStream) => Unit

    Returns a function OutputStream => Unit that either reads the content from stdin or does nothing but close the stream.

    Returns a function OutputStream => Unit that either reads the content from stdin or does nothing but close the stream. This function can be used by scala.sys.process.ProcessIO.

  20. final def isInstanceOf[T0]: Boolean

    Test whether the dynamic type of the receiver object has the same erasure as T0.

    Test whether the dynamic type of the receiver object has the same erasure as T0.

    Depending on what T0 is, the test is done in one of the below ways:

    • T0 is a non-parameterized class type, e.g. BigDecimal: this method returns true if the value of the receiver object is a BigDecimal or a subtype of BigDecimal.
    • T0 is a parameterized class type, e.g. List[Int]: this method returns true if the value of the receiver object is some List[X] for any X. For example, List(1, 2, 3).isInstanceOf[List[String]] will return true.
    • T0 is some singleton type x.type or literal x: this method returns this.eq(x). For example, x.isInstanceOf[1] is equivalent to x.eq(1)
    • T0 is an intersection X with Y or X & Y: this method is equivalent to x.isInstanceOf[X] && x.isInstanceOf[Y]
    • T0 is a union X | Y: this method is equivalent to x.isInstanceOf[X] || x.isInstanceOf[Y]
    • T0 is a type parameter or an abstract type member: this method is equivalent to isInstanceOf[U] where U is T0's upper bound, Any if T0 is unbounded. For example, x.isInstanceOf[A] where A is an unbounded type parameter will return true for any value of x.

    This is exactly equivalent to the type pattern _: T0

    returns

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

    Definition Classes
    Any
    Note

    due to the unexpectedness of List(1, 2, 3).isInstanceOf[List[String]] returning true and x.isInstanceOf[A] where A is a type parameter or abstract member returning true, these forms issue a warning.

  21. 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
  22. 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

  23. 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

  24. def processFully(processLine: (String) => Unit): (InputStream) => Unit

    Returns a function InputStream => Unit that will call the passed function with all data read.

    Returns a function InputStream => Unit that will call the passed function with all data read. This function can be used to create a scala.sys.process.ProcessIO. The processLine function will be called with each line read, and Newline will be appended after each line.

    processLine

    A function that will be called with all data read from the stream.

    returns

    A function InputStream => Unit (used by scala.sys.process.ProcessIO which will call processLine with all data read from the stream.

  25. def processFully(buffer: Appendable): (InputStream) => Unit

    Returns a function InputStream => Unit that appends all data read to the provided Appendable.

    Returns a function InputStream => Unit that appends all data read to the provided Appendable. This function can be used to create a scala.sys.process.ProcessIO. The buffer will be appended line by line.

    buffer

    An Appendable such as StringBuilder or StringBuffer.

    returns

    A function InputStream => Unit (used by scala.sys.process.ProcessIO which will append all data read from the stream to the buffer.

  26. def processLinesFully(processLine: (String) => Unit)(readLine: () => String): Unit

    Calls processLine with the result of readLine until the latter returns null or the current thread is interrupted.

  27. def standard(in: (OutputStream) => Unit): ProcessIO

    Returns a ProcessIO connected to stdout, stderr and the provided in

  28. def standard(connectInput: Boolean): ProcessIO

    Returns a ProcessIO connected to stdout and stderr, and, optionally, stdin.

  29. final def synchronized[T0](arg0: => T0): T0

    Executes the code in body with an exclusive lock on this.

    Executes the code in body with an exclusive lock on this.

    returns

    the result of body

    Definition Classes
    AnyRef
  30. def toStdErr: (InputStream) => Unit

    Send all the input from the stream to stderr, and closes the input stream afterwards.

  31. def toStdOut: (InputStream) => Unit

    Send all the input from the stream to stdout, and closes the input stream afterwards.

  32. def toString(): String

    Creates a String representation of this object.

    Creates a String representation of this object. The default representation is platform dependent. On the java platform it is the concatenation of the class name, "@", and the object's hashcode in hexadecimal.

    returns

    a String representation of the object.

    Definition Classes
    AnyRef → Any
  33. def transferFully(in: InputStream, out: OutputStream): Unit

    Copy all input from the input stream to the output stream.

    Copy all input from the input stream to the output stream. Closes the input stream once it's all read.

  34. final def wait(): Unit

    See https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html#wait--.

    Definition Classes
    AnyRef
    Annotations
    @throws(classOf[java.lang.InterruptedException])
    Note

    not specified by SLS as a member of AnyRef

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

    See https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html#wait-long-int-

    Definition Classes
    AnyRef
    Annotations
    @throws(classOf[java.lang.InterruptedException])
    Note

    not specified by SLS as a member of AnyRef

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

    See https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html#wait-long-.

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

    not specified by SLS as a member of AnyRef

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