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package bjc.utils.funcdata;
import java.util.function.BiConsumer;
import java.util.function.Consumer;
import java.util.function.Function;
/**
* A map that transforms values from one type to another
*
* @author ben
*
* @param <OldKey>
* The type of the map's keys
*
* @param <OldValue>
* The type of the map's values
*
* @param <NewValue>
* The type of the transformed values
*
*/
final class TransformedValueMap<OldKey, OldValue, NewValue> implements IMap<OldKey, NewValue> {
/* Our backing map. */
private final IMap<OldKey, OldValue> backing;
/* Our transforming function. */
private final Function<OldValue, NewValue> transformer;
/**
* Create a new transformed-value loop.
*
* @param backingMap
* The map to use as backing.
*
* @param transform
* The function to use for the transform.
*/
public TransformedValueMap(final IMap<OldKey, OldValue> backingMap,
final Function<OldValue, NewValue> transform) {
backing = backingMap;
transformer = transform;
}
@Override
public void clear() {
backing.clear();
}
@Override
public boolean containsKey(final OldKey key) {
return backing.containsKey(key);
}
@Override
public IMap<OldKey, NewValue> extend() {
return new ExtendedMap<>(this, new FunctionalMap<>());
}
@Override
public void forEach(final BiConsumer<OldKey, NewValue> action) {
backing.forEach((key, value) -> {
action.accept(key, transformer.apply(value));
});
}
@Override
public void forEachKey(final Consumer<OldKey> action) {
backing.forEachKey(action);
}
@Override
public void forEachValue(final Consumer<NewValue> action) {
backing.forEachValue(value -> {
action.accept(transformer.apply(value));
});
}
@Override
public NewValue get(final OldKey key) {
return transformer.apply(backing.get(key));
}
@Override
public int size() {
return backing.size();
}
@Override
public IList<OldKey> keyList() {
return backing.keyList();
}
@Override
public <MappedValue> IMap<OldKey, MappedValue> transform(final Function<NewValue, MappedValue> transform) {
return new TransformedValueMap<>(this, transform);
}
@Override
public NewValue put(final OldKey key, final NewValue value) {
throw new UnsupportedOperationException("Can't add items to transformed map");
}
@Override
public NewValue remove(final OldKey key) {
return transformer.apply(backing.remove(key));
}
@Override
public String toString() {
return backing.toString();
}
@Override
public IList<NewValue> valueList() {
return backing.valueList().map(transformer);
}
}
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