public static <Source, Target> Aura<Source, Target> merge(
Collection<Aura<? super Source, ? super Target>> auras) {
List<Aura<? super Source, ? super Target>> aurasCopy = new ArrayList<>(auras);
ExceptionHelper.checkNotNullElements(aurasCopy, "auras");
int count = aurasCopy.size();
if (count == 0) {
return (world, source, target) -> UndoableUnregisterRef.UNREGISTERED_REF;
}
if (count == 1) {
// Even if it is not, it shouldn't matter because the returned aura
// will accept anything a "<Source, Target>" would.
@SuppressWarnings("unchecked")
Aura<Source, Target> result = (Aura<Source, Target>) aurasCopy.get(0);
return result;
}
return (world, source, target) -> {
UndoableUnregisterRefBuilder result = new UndoableUnregisterRefBuilder(aurasCopy.size());
for (Aura<? super Source, ? super Target> aura : aurasCopy) {
result.addRef(aura.applyAura(world, source, target));
}
return result;
};
}
public static <Entity> EntityFilter<Entity> merge(
Collection<? extends EntityFilter<Entity>> filters) {
List<EntityFilter<Entity>> filtersCopy = new ArrayList<>(filters);
ExceptionHelper.checkNotNullElements(filtersCopy, "filters");
int count = filtersCopy.size();
if (count == 0) {
return EntityFilters.empty();
}
if (count == 1) {
return filtersCopy.get(0);
}
return (World world, Stream<? extends Entity> entities) -> {
Stream<? extends Entity> currentTargets = entities;
for (EntityFilter<Entity> filter : filtersCopy) {
currentTargets = filter.select(world, currentTargets);
}
return currentTargets;
};
}
public static <Self, T> AuraFilter<? super Self, ? super T> merge(
Collection<? extends AuraFilter<? super Self, ? super T>> filters) {
int filterCount = filters.size();
if (filterCount == 0) {
return AuraFilter.ANY;
}
if (filterCount == 1) {
return filters.iterator().next();
}
List<AuraFilter<? super Self, ? super T>> filtersCopy = new ArrayList<>(filters);
ExceptionHelper.checkNotNullElements(filtersCopy, "filters");
return (World world, Self owner, T eventSource) -> {
for (AuraFilter<? super Self, ? super T> filter : filtersCopy) {
if (!filter.isApplicable(world, owner, eventSource)) {
return false;
}
}
return true;
};
}
public ProjectInfo(Collection<Entry> entries) {
this.entries = Collections.unmodifiableList(new ArrayList<>(entries));
ExceptionHelper.checkNotNullElements(this.entries, "entries");
}
