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package bjc.utils.data;
import java.util.function.Function;
import java.util.function.UnaryOperator;
class WrappedLazy<ContainedType> implements IHolder<ContainedType> {
private IHolder<IHolder<ContainedType>> held;
public WrappedLazy(IHolder<ContainedType> wrappedHolder) {
held = new Lazy<>(wrappedHolder);
}
// This has an extra parameter, because otherwise it erases to the same
// as the public one
private WrappedLazy(IHolder<IHolder<ContainedType>> wrappedHolder,
boolean dummy) {
held = wrappedHolder;
}
@Override
public <BoundType> IHolder<BoundType> bind(
Function<ContainedType, IHolder<BoundType>> binder) {
IHolder<IHolder<BoundType>> newHolder = held
.map((containedHolder) -> {
return containedHolder.bind(binder);
});
return new WrappedLazy<>(newHolder, false);
}
@Override
public <NewType> Function<ContainedType, IHolder<NewType>> lift(
Function<ContainedType, NewType> func) {
return (val) -> {
return new Lazy<>(func.apply(val));
};
}
@Override
public <MappedType> IHolder<MappedType> map(
Function<ContainedType, MappedType> mapper) {
IHolder<IHolder<MappedType>> newHolder = held
.map((containedHolder) -> {
return containedHolder.map(mapper);
});
return new WrappedLazy<>(newHolder, false);
}
@Override
public IHolder<ContainedType> transform(
UnaryOperator<ContainedType> transformer) {
// FIXME this smells bad to me, but I can't figure out how else to
// do it
held.transform((containedHolder) -> {
return containedHolder.transform(transformer);
});
return this;
}
@Override
public <UnwrappedType> UnwrappedType unwrap(
Function<ContainedType, UnwrappedType> unwrapper) {
return held.unwrap((containedHolder) -> {
return containedHolder.unwrap(unwrapper);
});
}
}
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