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package bjc.utils.funcutils;
import java.util.function.Function;
/**
* A pair of functions to transform between a pair of types.
*
* @author bjculkin
*
* @param <S>
* The source type of the isomorphism.
*
* @param <D>
* The destination type of isomorphism.
*/
public class Isomorphism<S, D> {
/* The function to the destination type. */
private Function<S, D> toFunc;
/* The function to the source type. */
private Function<D, S> fromFunc;
/**
* Create a new isomorphism.
*
* @param to
* The 'forward' function, from the source to the definition.
*
* @param from
* The 'backward' function, from the definition to the source.
*/
public Isomorphism(Function<S, D> to, Function<D, S> from) {
toFunc = to;
fromFunc = from;
}
/**
* Apply the isomorphism forward.
*
* @param val
* The source value.
*
* @return
* The destination value.
*/
public D to(S val) {
return toFunc.apply(val);
}
/**
* Apply the isomorphism backward.
*
* @param val
* The destination value.
*
* @return
* The source value.
*/
public S from(D val) {
return fromFunc.apply(val);
}
}
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