/**
* Creates an iterator that returns an {@link Options} containing each possible parameter set
* defined by these {@link
* com.biomatters.plugins.barcoding.validator.research.options.BatchOptions}. Note that the {@link
* Options} object returned is always the same to save on initializing multiple copies. Each time
* {@link java.util.Iterator#next()} is called the next parameter set is set on the {@link
* Options}.
*
* @return An iterator that will iterate over all possible parameter sets specified by this {@link
* com.biomatters.plugins.barcoding.validator.research.options.BatchOptions}
* @throws DocumentOperationException if there is a problem creating the {@link Options} object
*/
public Iterator<T> iterator() throws DocumentOperationException {
List<Set<OptionToSet>> possibleValues = new ArrayList<Set<OptionToSet>>();
Map<String, MultiValueOption<?>> multiValueOptions = getMultiValueOptions("", options);
for (Map.Entry<String, MultiValueOption<?>> entry : multiValueOptions.entrySet()) {
possibleValues.add(getOptionsToSet(entry.getKey(), entry.getValue()));
}
Set<List<OptionToSet>> lists = Sets.cartesianProduct(possibleValues);
final Iterator<List<OptionToSet>> possibilityIterator = lists.iterator();
final T template;
try {
//noinspection unchecked
template = (T) options.getClass().newInstance(); // getClass() doesn't return Class<T> :(
template.valuesFromXML(options.valuesToXML(XMLSerializable.ROOT_ELEMENT_NAME));
} catch (InstantiationException e) {
throw new DocumentOperationException("Failed to create Options: " + e.getMessage(), e);
} catch (IllegalAccessException e) {
throw new DocumentOperationException("Failed to create Options: " + e.getMessage(), e);
}
return new Iterator<T>() {
@Override
public boolean hasNext() {
return possibilityIterator.hasNext();
}
@Override
public T next() {
List<OptionToSet> possibility = possibilityIterator.next();
for (OptionToSet optionToSet : possibility) {
template.setValue(optionToSet.name, optionToSet.value);
}
return template;
}
@Override
public void remove() {
new UnsupportedOperationException();
}
};
}
