DiscoveredInputsTaskStateChanges.java 文件源码

@Override
public Iterator<TaskStateChange> iterator() {
    if (getPrevious() == null) {
        return Iterators.<TaskStateChange>singletonIterator(new DescriptiveChange("Discovered input file history is not available."));
    }
    return getCurrent().iterateContentChangesSince(getPrevious(), "discovered input");
}