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spray.json.lenses

ReadLens

trait ReadLens[M[_]] extends AnyRef

The read lens can extract child values out of a JsValue hierarchy. A read lens is parameterized with a type constructor. This allows to extracts not only scalar values but also sequences or optional values.

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AnyRef, Any
Known Subclasses
Lens, LensImpl
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Abstract Value Members

  1. abstract def get[T](value: JsValue)(implicit arg0: Reader[T]): M[T]

    Given a parent JsValue extracts and converts a JsValue into a value of type T or throws an exception.

  2. abstract def is[U](f: (U) ⇒ Boolean)(implicit arg0: Reader[U]): JsPred

    Lifts a predicate for a converted value for this lens up to the parent level.

    Lifts a predicate for a converted value for this lens up to the parent level. The returned predicate will return false for values which fail to read.

  3. abstract def retr: (JsValue) ⇒ Validated[M[JsValue]]

    Given a parent JsValue, tries to extract the child value.

    Given a parent JsValue, tries to extract the child value.

    returns

    Right(value) if the lens read succeeds. Left(error) if the lens read fails.

  4. abstract def tryGet[T](value: JsValue)(implicit arg0: Reader[T]): Validated[M[T]]

    Given a parent JsValue extracts and tries to convert the JsValue into a value of type T

Concrete Value Members

  1. final def !=(arg0: Any): Boolean
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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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    @throws( ... )
  6. final def eq(arg0: AnyRef): Boolean
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  7. def equals(arg0: Any): Boolean
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  8. def finalize(): Unit
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    @throws( classOf[java.lang.Throwable] )
  9. final def getClass(): Class[_]
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  10. def hashCode(): Int
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  11. final def isInstanceOf[T0]: Boolean
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  12. final def ne(arg0: AnyRef): Boolean
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  13. final def notify(): Unit
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  14. final def notifyAll(): Unit
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  15. final def synchronized[T0](arg0: ⇒ T0): T0
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  16. def toString(): String
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  17. final def wait(): Unit
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  18. final def wait(arg0: Long, arg1: Int): Unit
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  19. final def wait(arg0: Long): Unit
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