src/main/java/com/workplacesystems/utilsj/collections/HashMap4Template.java
public V getOrCreate(K1 key1, K2 key2, K3 key3, K4 key4)
    {
        // already got it?
        MultiKey multi_key = new MultiKey(key1, key2, key3, key4);
        if (containsKey(multi_key))
            return get(multi_key);
        
        // if not, create and add it
        V result = create(key1, key2, key3, key4);
        put(multi_key, result);
        return result;
    }
public V getOrCreate(K1 key1, K2 key2, K3 key3, K4 key4)
    {
        // already got it?
        MultiKey multi_key = new MultiKey(key1, key2, key3, key4);
        if (containsKey(multi_key))
            return get(multi_key);
        
        // if not, create and add it
        V result = create(key1, key2, key3, key4);
        put(multi_key, result);
        return result;
    }
Method to get existing [key1,key2,key3,key4] value or create new one if it's
absent. Needs implementation of create(key1,key2,key3,key4) in order to work