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package bjc.utils.data;
import java.util.function.Function;
/**
* Generic interface for things that store a single value in a roughly
* monadic fashion
*
* @author ben
*
* @param <T>
* The type of data being stored
*/
public interface IHolder<T> {
/**
* Return the result of applying the given transformation to the held
* value Doesn't change the held value
*
* @param f
* The transformation to apply
* @return A holder with the transformed value
*/
public <NewT> IHolder<NewT> map(Function<T, NewT> f);
/**
* Apply the given transformation to the held value. Returns the holder
* for allowing chaining of transforms
*
* @param f
* The transform to apply to the value
* @return The holder
*/
public IHolder<T> transform(Function<T, T> f);
/**
* Returns a raw mapped value, not contained in a GenHolder
*
* @param f
* The function to use for mapping the value
* @return The mapped value outside of a GenHolder
*/
public <E> E unwrap(Function<T, E> f);
}
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