public static Item fromMap(Map<String, Object> attributes) {
        if (attributes == null)
            return null;
        Item item = new Item();
        for (Map.Entry<String, Object> e : attributes.entrySet())
            item.with(e.getKey(), e.getValue());
        return item;
    }
Convenient factory method - instantiates an <code>Item</code> from the
given map.

@param attributes
           simple Java types; not the DyanmoDB types
aws-java-sdk-dynamodb/src/main/java/com/amazonaws/services/dynamodbv2/document/Item.java