src/main/java/org/jivesoftware/smack/util/collections/AbstractReferenceMap.java
public V get(Object key) {
        purgeBeforeRead();
        Entry<K, V> entry = getEntry(key);
        if (entry == null) {
            return null;
        }
        return entry.getValue();
    }
public V get(Object key) {
        purgeBeforeRead();
        Entry<K, V> entry = getEntry(key);
        if (entry == null) {
            return null;
        }
        return entry.getValue();
    }
Gets the value mapped to the key specified.

@param key
the key
@return the mapped value, null if no match