public static <K, V> void _removeMatchingEntries(
NSMutableDictionary<? extends K, ? extends V> snapshot1,
NSMutableDictionary<? extends K, ? extends V> snapshot2,
boolean removeInverse) {
Enumeration<? extends K> keys1Enum = snapshot1.allKeys().immutableClone().objectEnumerator();
while (keys1Enum.hasMoreElements()) {
String key = (String) keys1Enum.nextElement();
Object value1 = snapshot1.objectForKey(key);
Object value2 = snapshot2.objectForKey(key);
boolean value1IsNull =
(value1 == null
|| value1 == EOKeyValueCoding.NullValue
|| value1 == NSKeyValueCoding.NullValue);
boolean value2IsNull =
(value2 == null
|| value2 == EOKeyValueCoding.NullValue
|| value2 == NSKeyValueCoding.NullValue);
if (value1IsNull && value2IsNull) {
snapshot1.removeObjectForKey(key);
snapshot2.removeObjectForKey(key);
} else if (value1 != null && value1.equals(value2)) {
snapshot1.removeObjectForKey(key);
snapshot2.removeObjectForKey(key);
}
}
// flip around the comparison and remove again
if (removeInverse) {
_removeMatchingEntries(snapshot2, snapshot1, false);
}
}
/**
* Removes entries from both dictionaries that match, leaving you with two dictionaries containing
* only values that did NOT match. Note that this comparison considers null ==
* EO/NSKeyValueCoding.NullValue.
*
* @param dict1 the first dictionary
* @param dict2 the second dictionary
*/
public static <K, V> void removeMatchingEntries(
NSMutableDictionary<? extends K, ? extends V> dict1,
NSMutableDictionary<? extends K, ? extends V> dict2) {
_removeMatchingEntries(dict1, dict2, true);
}