Java不会严格检查一致性,只有在遇到严重问题时才会通知您。同样,它也不能为您提供很多错误信息。
我对排序器中发生的事情感到困惑,并进行了严格的一致性检查器,也许这将对您有所帮助:
/**
* @param dailyReports
* @param comparator
*/
public static <T> void checkConsitency(final List<T> dailyReports, final Comparator<T> comparator) {
final Map<T, List<T>> objectMapSmallerOnes = new HashMap<T, List<T>>();
iterateDistinctPairs(dailyReports.iterator(), new IPairIteratorCallback<T>() {
/**
* @param o1
* @param o2
*/
@Override
public void pair(T o1, T o2) {
final int diff = comparator.compare(o1, o2);
if (diff < Compare.EQUAL) {
checkConsistency(objectMapSmallerOnes, o1, o2);
getListSafely(objectMapSmallerOnes, o2).add(o1);
} else if (Compare.EQUAL < diff) {
checkConsistency(objectMapSmallerOnes, o2, o1);
getListSafely(objectMapSmallerOnes, o1).add(o2);
} else {
throw new IllegalStateException("Equals not expected?");
}
}
});
}
/**
* @param objectMapSmallerOnes
* @param o1
* @param o2
*/
static <T> void checkConsistency(final Map<T, List<T>> objectMapSmallerOnes, T o1, T o2) {
final List<T> smallerThan = objectMapSmallerOnes.get(o1);
if (smallerThan != null) {
for (final T o : smallerThan) {
if (o == o2) {
throw new IllegalStateException(o2 + " cannot be smaller than " + o1 + " if it's supposed to be vice versa.");
}
checkConsistency(objectMapSmallerOnes, o, o2);
}
}
}
/**
* @param keyMapValues
* @param key
* @param <Key>
* @param <Value>
* @return List<Value>
*/
public static <Key, Value> List<Value> getListSafely(Map<Key, List<Value>> keyMapValues, Key key) {
List<Value> values = keyMapValues.get(key);
if (values == null) {
keyMapValues.put(key, values = new LinkedList<Value>());
}
return values;
}
/**
* @author Oku
*
* @param <T>
*/
public interface IPairIteratorCallback<T> {
/**
* @param o1
* @param o2
*/
void pair(T o1, T o2);
}
/**
*
* Iterates through each distinct unordered pair formed by the elements of a given iterator
*
* @param it
* @param callback
*/
public static <T> void iterateDistinctPairs(final Iterator<T> it, IPairIteratorCallback<T> callback) {
List<T> list = Convert.toMinimumArrayList(new Iterable<T>() {
@Override
public Iterator<T> iterator() {
return it;
}
});
for (int outerIndex = 0; outerIndex < list.size() - 1; outerIndex++) {
for (int innerIndex = outerIndex + 1; innerIndex < list.size(); innerIndex++) {
callback.pair(list.get(outerIndex), list.get(innerIndex));
}
}
}
s1.getParent().equals(s2)
而不是做s1.getParent() == s2
。