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package bjc.utils.data;
import java.util.function.Function;
import java.util.function.UnaryOperator;
import bjc.utils.funcdata.IList;
/*
* Holds a list, converted into a holder
*/
class BoundListHolder<ContainedType> implements IHolder<ContainedType> {
private IList<IHolder<ContainedType>> heldHolders;
public BoundListHolder(IList<IHolder<ContainedType>> toHold) {
heldHolders = toHold;
}
@Override
public <BoundType> IHolder<BoundType> bind(
Function<ContainedType, IHolder<BoundType>> binder) {
if (binder == null) {
throw new NullPointerException("Binder must not be null");
}
IList<IHolder<BoundType>> boundHolders = heldHolders
.map((containedHolder) -> {
return containedHolder.bind(binder);
});
return new BoundListHolder<>(boundHolders);
}
@Override
public <NewType> Function<ContainedType, IHolder<NewType>> lift(
Function<ContainedType, NewType> func) {
if (func == null) {
throw new NullPointerException(
"Function to lift must not be null");
}
return (val) -> {
return new ListHolder<>(func.apply(val));
};
}
@Override
public <MappedType> IHolder<MappedType> map(
Function<ContainedType, MappedType> mapper) {
if (mapper == null) {
throw new NullPointerException("Mapper must not be null");
}
IList<IHolder<MappedType>> mappedHolders = heldHolders
.map((containedHolder) -> {
return containedHolder.map(mapper);
});
return new BoundListHolder<>(mappedHolders);
}
@Override
public IHolder<ContainedType> transform(
UnaryOperator<ContainedType> transformer) {
if (transformer == null) {
throw new NullPointerException("Transformer must not be null");
}
heldHolders.forEach((containedHolder) -> {
containedHolder.transform(transformer);
});
return this;
}
@Override
public <UnwrappedType> UnwrappedType unwrap(
Function<ContainedType, UnwrappedType> unwrapper) {
if (unwrapper == null) {
throw new NullPointerException("Unwrapper must not be null");
}
return heldHolders.randItem().unwrap(unwrapper);
}
}
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