static Set<Pair<IDKey, IDKey>> getRegistry() {
return REGISTRY.get();
}
static Pair<IDKey, IDKey> getRegisterPair(final Object lhs, final Object rhs) {
final IDKey left = new IDKey(lhs);
final IDKey right = new IDKey(rhs);
return Pair.of(left, right);
}
/**
* <p>
* Returns <code>true</code> if the registry contains the given object pair.
* Used by the reflection methods to avoid infinite loops.
* Objects might be swapped therefore a check is needed if the object pair
* is registered in given or swapped order.
* </p>
*
* @param lhs <code>this</code> object to lookup in registry
* @param rhs the other object to lookup on registry
* @return boolean <code>true</code> if the registry contains the given object.
* @since 3.0
*/
static boolean isRegistered(final Object lhs, final Object rhs) {
final Set<Pair<IDKey, IDKey>> registry = getRegistry();
final Pair<IDKey, IDKey> pair = getRegisterPair(lhs, rhs);
final Pair<IDKey, IDKey> swappedPair = Pair.of(pair.getLeft(), pair.getRight());
return registry != null
&& (registry.contains(pair) || registry.contains(swappedPair));
}
上面是 org.apache.commons.lang3.builder.EqualsBuilder 的源码。 注释说对象注册的时候顺序可能发生交换，所以要检测交换顺序后的 Pair，但是 pair 和 swappedPair 中对象的顺序并没有交换呀。那有什么意义呢？还是源码错了？
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