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package bjc.data;
import java.util.function.Function;
import java.util.function.UnaryOperator;
import bjc.data.internals.BoundListHolder;
import bjc.funcdata.FunctionalList;
import bjc.funcdata.ListEx;
/**
* A holder that represents a set of non-deterministic computations.
*
* @author ben
*
* @param <ContainedType>
* The type of contained value.
*/
public class ListHolder<ContainedType> implements Holder<ContainedType> {
private ListEx<ContainedType> heldValues;
/**
* Create a new list holder.
*
* @param values
* The possible values for the computation.
*/
@SafeVarargs
public ListHolder(final ContainedType... values) {
heldValues = new FunctionalList<>();
if (values != null) {
for (final ContainedType containedValue : values) {
heldValues.add(containedValue);
}
}
}
/* Create a new holder with values. */
private ListHolder(final ListEx<ContainedType> toHold) {
heldValues = toHold;
}
@Override
public <BoundType> Holder<BoundType>
bind(final Function<ContainedType, Holder<BoundType>> binder) {
final ListEx<Holder<BoundType>> boundValues = heldValues.map(binder);
return new BoundListHolder<>(boundValues);
}
@Override
public <NewType> Function<ContainedType, Holder<NewType>>
lift(final Function<ContainedType, NewType> func) {
return val -> new ListHolder<>(new FunctionalList<>(func.apply(val)));
}
@Override
public <MappedType> Holder<MappedType>
map(final Function<ContainedType, MappedType> mapper) {
final ListEx<MappedType> mappedValues = heldValues.map(mapper);
return new ListHolder<>(mappedValues);
}
@Override
public Holder<ContainedType>
transform(final UnaryOperator<ContainedType> transformer) {
heldValues = heldValues.map(transformer);
return this;
}
@Override
public <UnwrappedType> UnwrappedType
unwrap(final Function<ContainedType, UnwrappedType> unwrapper) {
return unwrapper.apply(heldValues.randItem());
}
@Override
public String toString() {
return String.format("ListHolder [heldValues=%s]", heldValues);
}
@Override
public int hashCode() {
final int prime = 31;
int result = 1;
result = prime * result + (heldValues == null ? 0 : heldValues.hashCode());
return result;
}
@Override
public boolean equals(final Object obj) {
if (this == obj) return true;
if (obj == null) return false;
if (!(obj instanceof ListHolder<?>)) return false;
final ListHolder<?> other = (ListHolder<?>) obj;
if (heldValues == null) {
if (other.heldValues != null) return false;
} else if (!heldValues.equals(other.heldValues)) {
return false;
}
return true;
}
}
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