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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 IFunctionalMap<OldKey, NewValue> {
private IFunctionalMap<OldKey, OldValue> mapToTransform;
private Function<OldValue, NewValue> transformer;
public TransformedValueMap(IFunctionalMap<OldKey, OldValue> destMap,
Function<OldValue, NewValue> transform) {
mapToTransform = destMap;
transformer = transform;
}
@Override
public NewValue get(OldKey key) {
return transformer.apply(mapToTransform.get(key));
}
@Override
public boolean containsKey(OldKey key) {
return mapToTransform.containsKey(key);
}
@Override
public String toString() {
return mapToTransform.toString();
}
@Override
public NewValue put(OldKey key, NewValue val) {
throw new UnsupportedOperationException(
"Can't add items to transformed map");
}
@Override
public <MappedValue> IFunctionalMap<OldKey, MappedValue> mapValues(
Function<NewValue, MappedValue> transform) {
return new TransformedValueMap<>(this, transform);
}
@Override
public IFunctionalList<OldKey> keyList() {
return mapToTransform.keyList();
}
@Override
public void forEach(BiConsumer<OldKey, NewValue> action) {
mapToTransform.forEach((key, val) -> {
action.accept(key, transformer.apply(val));
});
}
@Override
public NewValue remove(OldKey key) {
return transformer.apply(mapToTransform.remove(key));
}
@Override
public int getSize() {
return mapToTransform.getSize();
}
@Override
public void forEachKey(Consumer<OldKey> action) {
mapToTransform.forEachKey(action);
}
@Override
public void forEachValue(Consumer<NewValue> action) {
mapToTransform.forEachValue((val) -> {
action.accept(transformer.apply(val));
});
}
@Override
public IFunctionalList<NewValue> valueList() {
return mapToTransform.valueList().map(transformer);
}
@Override
public IFunctionalMap<OldKey, NewValue> extend() {
return new ExtendedMap<>(this, new FunctionalMap<>());
}
}
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