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package org.zwobble.mammoth.tests;
import org.zwobble.mammoth.internal.util.Iterables;
import java.util.Iterator;
import static java.util.Arrays.asList;
public class Arguments {
// TODO: make sure all arguments are used
private final Object[] arguments;
public Arguments(Object[] arguments) {
this.arguments = arguments;
}
public <T> T get(Class<T> clazz) {
return only(getAll(clazz));
}
public <T> T get(Class<T> clazz, T defaultValue) {
return onlyOrDefault(getAll(clazz), defaultValue);
}
public <T> T get(ArgumentKey<T> key, T defaultValue) {
return onlyOrDefault(getAll(key), defaultValue);
}
private <T> Iterable<T> getAll(Class<T> clazz) {
return Iterables.lazyFilter(asList(arguments), clazz);
}
private <T> Iterable<T> getAll(ArgumentKey<T> key) {
return Iterables.lazyMap(
Iterables.lazyFilter(
Iterables.lazyFilter(asList(arguments), Argument.class),
argument -> argument.getKey().equals(key)
),
argument -> (T)argument.getValue()
);
}
private <T> T onlyOrDefault(Iterable<T> iterable, T defaultValue) {
return onlyOrDefault(iterable.iterator(), defaultValue);
}
private <T> T onlyOrDefault(Iterator<T> iterator, T defaultValue) {
if (!iterator.hasNext()) {
return defaultValue;
} else {
return only(iterator);
}
}
private <T> T only(Iterable<T> iterable) {
return only(iterable.iterator());
}
private <T> T only(Iterator<T> iterator) {
T value = iterator.next();
if (iterator.hasNext()) {
throw new RuntimeException("Expected exactly one element, but had multiple elements");
} else {
return value;
}
}
}
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