@Nullable
public <T> T findChildByClass(Class<T> aClass) {
for (PsiElement child : getChildren()) {
if (aClass.isInstance(child)) return (T) child;
}
return null;
}
@NotNull
public <T> T[] findChildrenByClass(Class<T> aClass) {
List<T> result = new ArrayList<T>();
for (PsiElement child : getChildren()) {
if (aClass.isInstance(child)) result.add((T) child);
}
return result.toArray((T[]) Array.newInstance(aClass, result.size()));
}