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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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

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