Package jsonvalues
Class Lens<S,O>
- java.lang.Object
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- jsonvalues.Lens<S,O>
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- Type Parameters:
S- the source of a lensO- the target of a lens
- Direct Known Subclasses:
JsObjLens
public class Lens<S,O> extends Object
A Lens is an optic that can be seen as a pair of functions:- get: S => O i.e. from an S, we can extract an O - set: (O, S) => S i.e. from an S and a O, we obtain a S. Unless a prism, to go back to S we need another S.Typically a Lens can be defined between a Product (e.g. record, tuple) and one of its component. Given a lens there are essentially three things you might want to do: -view the subpart -modify the whole by changing the subpart -combine this lens with another lens to look even deeper
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Field Summary
Fields Modifier and Type Field Description Function<Predicate<O>,Predicate<S>>existscheck if there is a target and it satisfies the predicateFunction<Predicate<O>,Function<S,Optional<O>>>findfind if the target satisfies the predicateFunction<S,O>getfunction to view the partFunction<Function<O,O>,Function<S,S>>modifyfunction to modify the whole by modifying the subpart with a functionFunction<O,Function<S,S>>setfunction to modify the whole by setting the subpart
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Field Detail
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set
public final Function<O,Function<S,S>> set
function to modify the whole by setting the subpart
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find
public final Function<Predicate<O>,Function<S,Optional<O>>> find
find if the target satisfies the predicate
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exists
public final Function<Predicate<O>,Predicate<S>> exists
check if there is a target and it satisfies the predicate
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