Key class

A complete or partial key.

A key can uniquely identify a datastore Entitys. It consists of a partition and path. The path consists of one or more KeyElements.

A key may be incomplete. This is usesful when inserting Entitys which IDs should be automatically allocated.

Example of a fully populated Key:

var fullKey = new Key([new KeyElement('Person', 1),
                       new KeyElement('Address', 2)]);

Example of a partially populated Key / an incomplete Key:

var partialKey = new Key([new KeyElement('Person', 1),
                          new KeyElement('Address', null)]);