src/main/java/org/jivesoftware/smack/util/collections/AbstractHashedMap.java
protected void addMapping(int hashIndex, int hashCode, K key, V value) {
        modCount++;
        HashEntry<K, V> entry = createEntry(data[hashIndex], hashCode, key,
                value);
        addEntry(entry, hashIndex);
        size++;
        checkCapacity();
    }
protected void addMapping(int hashIndex, int hashCode, K key, V value) {
        modCount++;
        HashEntry<K, V> entry = createEntry(data[hashIndex], hashCode, key,
                value);
        addEntry(entry, hashIndex);
        size++;
        checkCapacity();
    }
Adds a new key-value mapping into this map.
<p/>
This implementation calls <code>createEntry()</code>,
<code>addEntry()</code> and <code>checkCapacity()</code>. It also handles
changes to <code>modCount</code> and <code>size</code>. Subclasses could
override to fully control adds to the map.

@param hashIndex
the index into the data array to store at
@param hashCode
the hash code of the key to add
@param key
the key to add
@param value
the value to add