scala.sys

# Prop

#### trait Prop[+T] extends AnyRef

A lightweight interface wrapping a property contained in some unspecified map. Generally it'll be the system properties but this is not a requirement.

See `scala.sys.SystemProperties` for an example usage.

Source
  Prop.scala
Version

  2.9

Since

  2.9

Linear Supertypes
AnyRef, Any
Known Subclasses
BooleanProp
Type Hierarchy Learn more about scaladoc diagrams
Ordering

1. Alphabetic
2. By inheritance

Inherited

1. Prop
2. AnyRef
3. Any

Implicitly

1. by any2stringadd
2. by StringFormat
3. by Ensuring
4. by ArrowAssoc

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Visibility

1. Public
2. All

### Abstract Value Members

1. #### abstract def clear(): Unit

   Removes the property from the underlying map.

2. #### abstract def get: String

   Gets the current string value if any.

   Gets the current string value if any. Will not return null: use `isSet` to test for existence.

   returns

     the current string value if any, else the empty string

3. #### abstract def isSet: Boolean

   True if the key exists in the properties map.

   True if the key exists in the properties map. Note that this is not sufficient for a Boolean property to be considered true.

   returns

     whether the map contains the key

4. #### abstract def key: String

   The full name of the property, e.g., "java.awt.headless".

5. #### abstract def option: Option[T]

   Some(value) if the property is set, None otherwise.

6. #### abstract def set(newValue: String): String

   Sets the property.

   Sets the property.

   newValue

     the new string value

   returns

     the old value, or null if it was unset.

7. #### abstract def setValue[T1 >: T](value: T1): T

   Sets the property with a value of the represented type.

8. #### abstract def value: T

   If the key exists in the properties map, converts the value to type `T` using valueFn.

   If the key exists in the properties map, converts the value to type `T` using valueFn. As yet no validation is performed: it will throw an exception on a failed conversion.

   returns

     the converted value, or `zero` if not in the map

9. #### abstract def zero: T

   A value of type `T` for use when the property is unset.

   A value of type `T` for use when the property is unset. The default implementation delivers null for reference types and 0/0.0/false for non-reference types.

   Attributes
     protected

### Concrete Value Members

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

   Definition Classes
     AnyRef → Any

2. #### final def ##(): Int

   Definition Classes
     AnyRef → Any

3. #### def +(other: String): String

   Implicit information
     This member is added by an implicit conversion from Prop[T] to any2stringadd[Prop[T]] performed by method any2stringadd in scala.Predef.
   Definition Classes
     any2stringadd

4. #### def ->[B](y: B): (Prop[T], B)

   Implicit information
     This member is added by an implicit conversion from Prop[T] to ArrowAssoc[Prop[T]] performed by method ArrowAssoc in scala.Predef.
   Definition Classes
     ArrowAssoc
   Annotations
     @inline()

5. #### final def ==(arg0: Any): Boolean

   Definition Classes
     AnyRef → Any

6. #### final def asInstanceOf[T0]: T0

   Definition Classes
     Any

7. #### def clone(): AnyRef

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

8. #### def ensuring(cond: (Prop[T]) ⇒ Boolean, msg: ⇒ Any): Prop[T]

   Implicit information
     This member is added by an implicit conversion from Prop[T] to Ensuring[Prop[T]] performed by method Ensuring in scala.Predef.
   Definition Classes
     Ensuring

9. #### def ensuring(cond: (Prop[T]) ⇒ Boolean): Prop[T]

   Implicit information
     This member is added by an implicit conversion from Prop[T] to Ensuring[Prop[T]] performed by method Ensuring in scala.Predef.
   Definition Classes
     Ensuring

10. #### def ensuring(cond: Boolean, msg: ⇒ Any): Prop[T]

    Implicit information
      This member is added by an implicit conversion from Prop[T] to Ensuring[Prop[T]] performed by method Ensuring in scala.Predef.
    Definition Classes
      Ensuring

11. #### def ensuring(cond: Boolean): Prop[T]

    Implicit information
      This member is added by an implicit conversion from Prop[T] to Ensuring[Prop[T]] performed by method Ensuring in scala.Predef.
    Definition Classes
      Ensuring

12. #### final def eq(arg0: AnyRef): Boolean

    Definition Classes
      AnyRef

13. #### def equals(arg0: Any): Boolean

    Definition Classes
      AnyRef → Any

14. #### def finalize(): Unit

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

15. #### 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 information
      This member is added by an implicit conversion from Prop[T] to StringFormat[Prop[T]] performed by method StringFormat in scala.Predef.
    Definition Classes
      StringFormat
    Annotations
      @inline()

16. #### final def getClass(): Class[_]

    Definition Classes
      AnyRef → Any

17. #### def hashCode(): Int

    Definition Classes
      AnyRef → Any

18. #### final def isInstanceOf[T0]: Boolean

    Definition Classes
      Any

19. #### final def ne(arg0: AnyRef): Boolean

    Definition Classes
      AnyRef

20. #### final def notify(): Unit

    Definition Classes
      AnyRef

21. #### final def notifyAll(): Unit

    Definition Classes
      AnyRef

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

    Definition Classes
      AnyRef

23. #### def toString(): String

    Definition Classes
      AnyRef → Any

24. #### final def wait(): Unit

    Definition Classes
      AnyRef
    Annotations
      @throws( ... )

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

    Definition Classes
      AnyRef
    Annotations
      @throws( ... )

26. #### final def wait(arg0: Long): Unit

    Definition Classes
      AnyRef
    Annotations
      @throws( ... )

27. #### def →[B](y: B): (Prop[T], B)

    Implicit information
      This member is added by an implicit conversion from Prop[T] to ArrowAssoc[Prop[T]] performed by method ArrowAssoc in scala.Predef.
    Definition Classes
      ArrowAssoc

### Inherited from AnyRef

### Inherited from Any

### Inherited by implicit conversion any2stringadd from Prop[T] to any2stringadd[Prop[T]]

### Inherited by implicit conversion StringFormat from Prop[T] to StringFormat[Prop[T]]

### Inherited by implicit conversion Ensuring from Prop[T] to Ensuring[Prop[T]]

### Inherited by implicit conversion ArrowAssoc from Prop[T] to ArrowAssoc[Prop[T]]

### Ungrouped