protected HashEntry<K, V> getEntry(Object key) {
        int hashCode = hash((key == null) ? NULL : key);
        HashEntry<K, V> entry = data[hashIndex(hashCode, data.length)]; // no local for hash index
        while (entry != null) {
            if (entry.hashCode == hashCode && isEqualKey(key, entry.getKey())) {
                return entry;
            }
            entry = entry.next;
        }
        return null;
    }
Gets the entry mapped to the key specified.
<p/>
This method exists for subclasses that may need to perform a multi-step
process accessing the entry. The public methods in this class don't use this
method to gain a small performance boost.

@param key the key
@return the entry, null if no match
jphp-runtime/src/php/runtime/common/collections/map/AbstractHashedMap.java