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package bjc.utils.data;
import java.util.function.Function;
import java.util.function.UnaryOperator;
import bjc.utils.funcdata.FunctionalList;
import bjc.utils.funcdata.IList;
/**
* A holder that represents a set of non-deterministic computations
*
* @author ben
*
* @param <ContainedType>
* The type of contained value
*/
public class ListHolder<ContainedType> implements IHolder<ContainedType> {
private IList<ContainedType> heldValues;
/**
* Create a new list holder
*
* @param values
* The possible values for the computation
*/
@SafeVarargs
public ListHolder(ContainedType... values) {
heldValues = new FunctionalList<>();
if (values != null) {
for (ContainedType containedValue : values) {
heldValues.add(containedValue);
}
}
}
private ListHolder(IList<ContainedType> toHold) {
heldValues = toHold;
}
@Override
public <BoundType> IHolder<BoundType> bind(
Function<ContainedType, IHolder<BoundType>> binder) {
IList<IHolder<BoundType>> boundValues = heldValues.map(binder);
return new BoundListHolder<>(boundValues);
}
@Override
public <NewType> Function<ContainedType, IHolder<NewType>> lift(
Function<ContainedType, NewType> func) {
return (val) -> {
return new ListHolder<>(new FunctionalList<>(func.apply(val)));
};
}
@Override
public <MappedType> IHolder<MappedType> map(
Function<ContainedType, MappedType> mapper) {
IList<MappedType> mappedValues = heldValues.map(mapper);
return new ListHolder<>(mappedValues);
}
@Override
public IHolder<ContainedType> transform(
UnaryOperator<ContainedType> transformer) {
heldValues = heldValues.map(transformer);
return this;
}
@Override
public <UnwrappedType> UnwrappedType unwrap(
Function<ContainedType, UnwrappedType> unwrapper) {
return unwrapper.apply(heldValues.randItem());
}
}
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