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package bjc.utils.data;
import java.util.function.Function;
import java.util.function.UnaryOperator;
class WrappedOption<ContainedType> implements IHolder<ContainedType> {
private IHolder<IHolder<ContainedType>> held;
private WrappedOption(IHolder<IHolder<ContainedType>> toHold,
@SuppressWarnings("unused") boolean dummy) {
held = toHold;
}
public WrappedOption(IHolder<ContainedType> seedValue) {
held = new Option<>(seedValue);
}
@Override
public <BoundType> IHolder<BoundType> bind(
Function<ContainedType, IHolder<BoundType>> binder) {
IHolder<IHolder<BoundType>> newHolder = held
.map((containedHolder) -> {
return containedHolder.bind((containedValue) -> {
if (containedValue == null) {
return new Option<>(null);
}
return binder.apply(containedValue);
});
});
return new WrappedOption<>(newHolder, false);
}
@Override
public <MappedType> IHolder<MappedType> map(
Function<ContainedType, MappedType> mapper) {
IHolder<IHolder<MappedType>> newHolder = held
.map((containedHolder) -> {
return containedHolder.map((containedValue) -> {
if (containedValue == null) {
return null;
}
return mapper.apply(containedValue);
});
});
return new WrappedOption<>(newHolder, false);
}
@Override
public IHolder<ContainedType> transform(
UnaryOperator<ContainedType> transformer) {
held.transform((containedHolder) -> {
return containedHolder.transform((containedValue) -> {
if (containedValue == null) {
return null;
}
return transformer.apply(containedValue);
});
});
return this;
}
@Override
public <UnwrappedType> UnwrappedType unwrap(
Function<ContainedType, UnwrappedType> unwrapper) {
return held.unwrap((containedHolder) -> {
return containedHolder.unwrap((containedValue) -> {
if (containedValue == null) {
return null;
}
return unwrapper.apply(containedValue);
});
});
}
@Override
public <NewType> Function<ContainedType, IHolder<NewType>> lift(
Function<ContainedType, NewType> func) {
return (val) -> {
return new Option<>(func.apply(val));
};
}
}
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