## Uses of Interface
org.apache.tapestry5.func.Mapper

- Packages that use Mapper
  Package | Description
  --- | ---
  org.apache.tapestry5.func | Light-weight functional programming for Flows of values
  org.apache.tapestry5.internal | [INTERNAL USE ONLY] internal support classes; API subject to change.
  org.apache.tapestry5.ioc.internal.util | [INTERNAL USE ONLY] utility classes for Tapestry IOC services; API subject to change

- - ### Uses of Mapper in org.apache.tapestry5.func

    Methods in org.apache.tapestry5.func that return Mapper
    Modifier and Type | Method | Description
    --- | --- | ---
    `static <S,​T> Mapper<S,​T>` | F.`always​(T fixedResult)` | A Mapper factory; the returned Mapper ignores its input value and always returns a predetermined result.
    `static <A,​B,​C> Mapper<A,​C>` | F.`combine​(Mapper<A,​B> abMapper, Mapper<B,​C> bcMapper)` | Combines two mappers into a composite mapping from type A to type C via type B.
    `static <S> Mapper<S,​S>` | F.`identity()` | A Mapper factory; the Mapper returns the the flow value unchanged.
    `static <S,​T> Mapper<S,​T>` | F.`select​(Predicate<? super S> predicate, Mapper<S,​T> ifAccepted)` | Override of `F.select(Predicate, Mapper, Mapper)` where rejected values are replaced with null.
    `static <S,​T> Mapper<S,​T>` | F.`select​(Predicate<? super S> predicate, Mapper<S,​T> ifAccepted, Mapper<S,​T> ifRejected)` | A Mapper factory that combines a Predicate with two `Mapper`s; evaluating the predicate selects one of the two mappers.
    `static <S,​T> Mapper<S,​T>` | F.`select​(Predicate<? super S> predicate, Mapper<S,​T> ifAccepted, T ifRejectedValue)` | Override of `F.select(Predicate, Mapper)` where rejected values are replaced with a fixed value.
    `static <T> Mapper<T,​String>` | F.`stringValueOf()` | A Mapper factory that gets the string value of the flow value using `String.valueOf(Object)`.

    Methods in org.apache.tapestry5.func with parameters of type Mapper
    Modifier and Type | Method | Description
    --- | --- | ---
    `static <A,​B,​C> Mapper<A,​C>` | F.`combine​(Mapper<A,​B> abMapper, Mapper<B,​C> bcMapper)` | Combines two mappers into a composite mapping from type A to type C via type B.
    `static <T> Flow<T>` | F.`iterate​(T initial, Mapper<T,​T> function)` | Creates an infinite lazy flow from an initial value and a function to map from the current value to the next value.
    `<X> Flow<X>` | Flow.`map​(Mapper<T,​X> mapper)` | Maps a Flow into a new Flow with different type values.
    `<X> Flow<X>` | Flow.`mapcat​(Mapper<T,​Flow<X>> mapper)` | Given a `Mapper` that maps a T to a `Flow<X>`, this method will lazily concatenate all the output flows into a single `Flow<X>`.
    `<X,​Y> ZippedFlow<X,​Y>` | ZippedFlow.`mapTuples​(Mapper<Tuple<A,​B>,​Tuple<X,​Y>> mapper)` | Mapping for zipped flows; a mapper is used to map tuples of this zipped flow into new tuples with a new type, forming the resulting zipped flow.
    `static <S,​T> Mapper<S,​T>` | F.`select​(Predicate<? super S> predicate, Mapper<S,​T> ifAccepted)` | Override of `F.select(Predicate, Mapper, Mapper)` where rejected values are replaced with null.
    `static <S,​T> Mapper<S,​T>` | F.`select​(Predicate<? super S> predicate, Mapper<S,​T> ifAccepted, Mapper<S,​T> ifRejected)` | A Mapper factory that combines a Predicate with two `Mapper`s; evaluating the predicate selects one of the two mappers.
    `static <S,​T> Mapper<S,​T>` | F.`select​(Predicate<? super S> predicate, Mapper<S,​T> ifAccepted, T ifRejectedValue)` | Override of `F.select(Predicate, Mapper)` where rejected values are replaced with a fixed value.
    `static <S> Predicate<S>` | F.`toPredicate​(Mapper<S,​Boolean> mapper)` | Allows a Mapper that maps to boolean to be used as a Predicate.

  - ### Uses of Mapper in org.apache.tapestry5.internal

    Fields in org.apache.tapestry5.internal declared as Mapper
    Modifier and Type | Field | Description
    --- | --- | ---
    `static Mapper<Asset,​StylesheetLink>` | TapestryInternalUtils.`assetToStylesheetLink` | Common mapper, used primarily with `Flow.map(org.apache.tapestry5.func.Mapper)`

  - ### Uses of Mapper in org.apache.tapestry5.ioc.internal.util

    Fields in org.apache.tapestry5.ioc.internal.util declared as Mapper
    Modifier and Type | Field | Description
    --- | --- | ---
    `static Mapper<Class,​AnnotationProvider>` | InternalUtils.`CLASS_TO_AP_MAPPER` |
    `static Mapper<ObjectCreator,​Object>` | InternalUtils.`CREATE_OBJECT` |
    `static Mapper<Method,​AnnotationProvider>` | InternalUtils.`METHOD_TO_AP_MAPPER` |

    Methods in org.apache.tapestry5.ioc.internal.util that return Mapper
    Modifier and Type | Method | Description
    --- | --- | ---
    `static <S,​T> Mapper<S,​T>` | InternalUtils.`toMapper​(Coercion<S,​T> coercion)` | Wraps a `Coercion` as a `Mapper`.